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jeremybenn |
/**
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******************************************************************************
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* @file stm32l1xx_usart.c
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* @author MCD Application Team
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* @version V1.0.0RC1
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* @date 07/02/2010
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* @brief This file provides all the USART firmware functions.
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******************************************************************************
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* @copy
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*
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*
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* <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32l1xx_usart.h"
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#include "stm32l1xx_rcc.h"
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/** @addtogroup STM32L1xx_StdPeriph_Driver
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* @{
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*/
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/** @defgroup USART
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* @brief USART driver modules
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* @{
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*/
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/** @defgroup USART_Private_TypesDefinitions
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* @{
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*/
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/**
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* @}
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*/
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/** @defgroup USART_Private_Defines
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* @{
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*/
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/*!< USART CR1 register clear Mask ((~(uint16_t)0xE9F3)) */
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#define CR1_CLEAR_MASK ((uint16_t)(USART_CR1_M | USART_CR1_PCE | \
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USART_CR1_PS | USART_CR1_TE | \
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USART_CR1_RE))
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/*!< USART CR2 register clock bits clear Mask ((~(uint16_t)0xF0FF)) */
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#define CR2_CLOCK_CLEAR_MASK ((uint16_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \
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USART_CR2_CPHA | USART_CR2_LBCL))
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/*!< USART CR3 register clear Mask ((~(uint16_t)0xFCFF)) */
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#define CR3_CLEAR_MASK ((uint16_t)(USART_CR3_RTSE | USART_CR3_CTSE))
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/*!< USART Interrupts mask */
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#define IT_MASK ((uint16_t)0x001F)
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/**
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* @}
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*/
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/** @defgroup USART_Private_Macros
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* @{
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*/
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/**
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* @}
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*/
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/** @defgroup USART_Private_Variables
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* @{
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*/
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/**
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* @}
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*/
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/** @defgroup USART_Private_FunctionPrototypes
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* @{
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*/
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/**
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* @}
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*/
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/** @defgroup USART_Private_Functions
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* @{
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*/
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/**
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* @brief Deinitializes the USARTx peripheral registers to their default reset values.
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* @param USARTx: Select the USART peripheral.
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* This parameter can be one of the following values: USART1, USART2 or USART3.
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* @retval None
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*/
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void USART_DeInit(USART_TypeDef* USARTx)
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{
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/* Check the parameters */
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assert_param(IS_USART_ALL_PERIPH(USARTx));
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if (USARTx == USART1)
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{
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
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}
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else if (USARTx == USART2)
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{
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
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}
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else
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{
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if (USARTx == USART3)
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{
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
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}
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}
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}
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/**
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* @brief Initializes the USARTx peripheral according to the specified
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* parameters in the USART_InitStruct .
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* @param USARTx: Select the USART peripheral.
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* This parameter can be one of the following values:
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* USART1, USART2 or USART3.
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* @param USART_InitStruct: pointer to a USART_InitTypeDef structure
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* that contains the configuration information for the specified USART peripheral.
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* @retval None
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*/
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void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)
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{
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uint32_t tmpreg = 0x00, apbclock = 0x00;
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uint32_t integerdivider = 0x00;
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uint32_t fractionaldivider = 0x00;
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RCC_ClocksTypeDef RCC_ClocksStatus;
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/* Check the parameters */
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assert_param(IS_USART_ALL_PERIPH(USARTx));
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assert_param(IS_USART_BAUDRATE(USART_InitStruct->USART_BaudRate));
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assert_param(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength));
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assert_param(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits));
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assert_param(IS_USART_PARITY(USART_InitStruct->USART_Parity));
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assert_param(IS_USART_MODE(USART_InitStruct->USART_Mode));
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assert_param(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl));
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/*---------------------------- USART CR2 Configuration -----------------------*/
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tmpreg = USARTx->CR2;
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/* Clear STOP[13:12] bits */
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tmpreg &= (uint32_t)~((uint32_t)USART_CR2_STOP);
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/* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit ------------*/
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/* Set STOP[13:12] bits according to USART_StopBits value */
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tmpreg |= (uint32_t)USART_InitStruct->USART_StopBits;
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/* Write to USART CR2 */
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USARTx->CR2 = (uint16_t)tmpreg;
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/*---------------------------- USART CR1 Configuration -----------------------*/
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tmpreg = USARTx->CR1;
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/* Clear M, PCE, PS, TE and RE bits */
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tmpreg &= (uint32_t)~((uint32_t)CR1_CLEAR_MASK);
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/* Configure the USART Word Length, Parity and mode ----------------------- */
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/* Set the M bits according to USART_WordLength value */
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/* Set PCE and PS bits according to USART_Parity value */
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/* Set TE and RE bits according to USART_Mode value */
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tmpreg |= (uint32_t)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |
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USART_InitStruct->USART_Mode;
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/* Write to USART CR1 */
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USARTx->CR1 = (uint16_t)tmpreg;
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/*---------------------------- USART CR3 Configuration -----------------------*/
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tmpreg = USARTx->CR3;
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/* Clear CTSE and RTSE bits */
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tmpreg &= (uint32_t)~((uint32_t)CR3_CLEAR_MASK);
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/* Configure the USART HFC -------------------------------------------------*/
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/* Set CTSE and RTSE bits according to USART_HardwareFlowControl value */
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tmpreg |= USART_InitStruct->USART_HardwareFlowControl;
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/* Write to USART CR3 */
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USARTx->CR3 = (uint16_t)tmpreg;
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/*---------------------------- USART BRR Configuration -----------------------*/
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/* Configure the USART Baud Rate -------------------------------------------*/
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RCC_GetClocksFreq(&RCC_ClocksStatus);
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if (USARTx == USART1)
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{
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apbclock = RCC_ClocksStatus.PCLK2_Frequency;
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}
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else
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{
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apbclock = RCC_ClocksStatus.PCLK1_Frequency;
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}
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/* Determine the integer part */
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if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
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{
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/* Integer part computing in case Oversampling mode is 8 Samples */
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integerdivider = ((25 * apbclock) / (2 * (USART_InitStruct->USART_BaudRate)));
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}
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else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */
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{
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/* Integer part computing in case Oversampling mode is 16 Samples */
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integerdivider = ((25 * apbclock) / (4 * (USART_InitStruct->USART_BaudRate)));
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}
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tmpreg = (integerdivider / 100) << 4;
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/* Determine the fractional part */
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fractionaldivider = integerdivider - (100 * (tmpreg >> 4));
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/* Implement the fractional part in the register */
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if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
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{
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tmpreg |= ((((fractionaldivider * 8) + 50) / 100)) & ((uint8_t)0x07);
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}
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else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */
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{
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tmpreg |= ((((fractionaldivider * 16) + 50) / 100)) & ((uint8_t)0x0F);
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}
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/* Write to USART BRR */
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USARTx->BRR = (uint16_t)tmpreg;
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}
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/**
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* @brief Fills each USART_InitStruct member with its default value.
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* @param USART_InitStruct: pointer to a USART_InitTypeDef structure
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* which will be initialized.
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* @retval None
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*/
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void USART_StructInit(USART_InitTypeDef* USART_InitStruct)
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{
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/* USART_InitStruct members default value */
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USART_InitStruct->USART_BaudRate = 9600;
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USART_InitStruct->USART_WordLength = USART_WordLength_8b;
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USART_InitStruct->USART_StopBits = USART_StopBits_1;
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USART_InitStruct->USART_Parity = USART_Parity_No ;
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USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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}
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/**
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* @brief Initializes the USARTx peripheral Clock according to the
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* specified parameters in the USART_ClockInitStruct .
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* @param USARTx: where x can be 1, 2, 3 to select the USART peripheral.
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* @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef
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* structure that contains the configuration information for the specified
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* USART peripheral.
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* @retval None
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*/
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void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)
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{
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uint32_t tmpreg = 0x00;
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/* Check the parameters */
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assert_param(IS_USART_ALL_PERIPH(USARTx));
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assert_param(IS_USART_CLOCK(USART_ClockInitStruct->USART_Clock));
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assert_param(IS_USART_CPOL(USART_ClockInitStruct->USART_CPOL));
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assert_param(IS_USART_CPHA(USART_ClockInitStruct->USART_CPHA));
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assert_param(IS_USART_LASTBIT(USART_ClockInitStruct->USART_LastBit));
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/*---------------------------- USART CR2 Configuration -----------------------*/
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tmpreg = USARTx->CR2;
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/* Clear CLKEN, CPOL, CPHA and LBCL bits */
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tmpreg &= (uint32_t)~((uint32_t)CR2_CLOCK_CLEAR_MASK);
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/* Configure the USART Clock, CPOL, CPHA and LastBit ------------*/
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/* Set CLKEN bit according to USART_Clock value */
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/* Set CPOL bit according to USART_CPOL value */
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/* Set CPHA bit according to USART_CPHA value */
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/* Set LBCL bit according to USART_LastBit value */
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tmpreg |= (uint32_t)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL |
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USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit;
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/* Write to USART CR2 */
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USARTx->CR2 = (uint16_t)tmpreg;
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}
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/**
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* @brief Fills each USART_ClockInitStruct member with its default value.
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* @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef
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* structure which will be initialized.
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* @retval None
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*/
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void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct)
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{
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/* USART_ClockInitStruct members default value */
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USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;
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USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;
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USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;
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USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;
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}
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/**
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* @brief Enables or disables the specified USART peripheral.
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* @param USARTx: Select the USART peripheral.
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* This parameter can be one of the following values:
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* USART1, USART2 or USART3.
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* @param NewState: new state of the USARTx peripheral.
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* This parameter can be: ENABLE or DISABLE.
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* @retval None
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*/
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void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
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{
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/* Check the parameters */
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assert_param(IS_USART_ALL_PERIPH(USARTx));
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assert_param(IS_FUNCTIONAL_STATE(NewState));
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if (NewState != DISABLE)
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{
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/* Enable the selected USART by setting the UE bit in the CR1 register */
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USARTx->CR1 |= USART_CR1_UE;
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}
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else
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{
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/* Disable the selected USART by clearing the UE bit in the CR1 register */
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USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_UE);
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}
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}
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/**
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325 |
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* @brief Enables or disables the specified USART interrupts.
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326 |
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* @param USARTx: Select the USART peripheral.
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* This parameter can be one of the following values:
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* USART1, USART2 or USART3.
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* @param USART_IT: specifies the USART interrupt sources to be enabled or disabled.
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* This parameter can be one of the following values:
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|
|
* @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5)
|
332 |
|
|
* @arg USART_IT_LBD: LIN Break detection interrupt
|
333 |
|
|
* @arg USART_IT_TXE: Tansmit Data Register empty interrupt
|
334 |
|
|
* @arg USART_IT_TC: Transmission complete interrupt
|
335 |
|
|
* @arg USART_IT_RXNE: Receive Data register not empty interrupt
|
336 |
|
|
* @arg USART_IT_IDLE: Idle line detection interrupt
|
337 |
|
|
* @arg USART_IT_PE: Parity Error interrupt
|
338 |
|
|
* @arg USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error)
|
339 |
|
|
* @param NewState: new state of the specified USARTx interrupts.
|
340 |
|
|
* This parameter can be: ENABLE or DISABLE.
|
341 |
|
|
* @retval None
|
342 |
|
|
*/
|
343 |
|
|
void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState)
|
344 |
|
|
{
|
345 |
|
|
uint32_t usartreg = 0x00, itpos = 0x00, itmask = 0x00;
|
346 |
|
|
uint32_t usartxbase = 0x00;
|
347 |
|
|
/* Check the parameters */
|
348 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
349 |
|
|
assert_param(IS_USART_CONFIG_IT(USART_IT));
|
350 |
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
351 |
|
|
|
352 |
|
|
usartxbase = (uint32_t)USARTx;
|
353 |
|
|
|
354 |
|
|
/* Get the USART register index */
|
355 |
|
|
usartreg = (((uint8_t)USART_IT) >> 0x05);
|
356 |
|
|
|
357 |
|
|
/* Get the interrupt position */
|
358 |
|
|
itpos = USART_IT & IT_MASK;
|
359 |
|
|
itmask = (((uint32_t)0x01) << itpos);
|
360 |
|
|
|
361 |
|
|
if (usartreg == 0x01) /* The IT is in CR1 register */
|
362 |
|
|
{
|
363 |
|
|
usartxbase += 0x0C;
|
364 |
|
|
}
|
365 |
|
|
else if (usartreg == 0x02) /* The IT is in CR2 register */
|
366 |
|
|
{
|
367 |
|
|
usartxbase += 0x10;
|
368 |
|
|
}
|
369 |
|
|
else /* The IT is in CR3 register */
|
370 |
|
|
{
|
371 |
|
|
usartxbase += 0x14;
|
372 |
|
|
}
|
373 |
|
|
if (NewState != DISABLE)
|
374 |
|
|
{
|
375 |
|
|
*(__IO uint32_t*)usartxbase |= itmask;
|
376 |
|
|
}
|
377 |
|
|
else
|
378 |
|
|
{
|
379 |
|
|
*(__IO uint32_t*)usartxbase &= ~itmask;
|
380 |
|
|
}
|
381 |
|
|
}
|
382 |
|
|
|
383 |
|
|
/**
|
384 |
|
|
* @brief Enables or disables the USART’s DMA interface.
|
385 |
|
|
* @param USARTx: Select the USART peripheral.
|
386 |
|
|
* This parameter can be one of the following values:
|
387 |
|
|
* USART1, USART2 or USART3.
|
388 |
|
|
* @param USART_DMAReq: specifies the DMA request.
|
389 |
|
|
* This parameter can be any combination of the following values:
|
390 |
|
|
* @arg USART_DMAReq_Tx: USART DMA transmit request
|
391 |
|
|
* @arg USART_DMAReq_Rx: USART DMA receive request
|
392 |
|
|
* @param NewState: new state of the DMA Request sources.
|
393 |
|
|
* This parameter can be: ENABLE or DISABLE.
|
394 |
|
|
* @note The DMA mode is not available for UART5.
|
395 |
|
|
* @retval None
|
396 |
|
|
*/
|
397 |
|
|
void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState)
|
398 |
|
|
{
|
399 |
|
|
/* Check the parameters */
|
400 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
401 |
|
|
assert_param(IS_USART_DMAREQ(USART_DMAReq));
|
402 |
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
403 |
|
|
|
404 |
|
|
if (NewState != DISABLE)
|
405 |
|
|
{
|
406 |
|
|
/* Enable the DMA transfer for selected requests by setting the DMAT and/or
|
407 |
|
|
DMAR bits in the USART CR3 register */
|
408 |
|
|
USARTx->CR3 |= USART_DMAReq;
|
409 |
|
|
}
|
410 |
|
|
else
|
411 |
|
|
{
|
412 |
|
|
/* Disable the DMA transfer for selected requests by clearing the DMAT and/or
|
413 |
|
|
DMAR bits in the USART CR3 register */
|
414 |
|
|
USARTx->CR3 &= (uint16_t)~USART_DMAReq;
|
415 |
|
|
}
|
416 |
|
|
}
|
417 |
|
|
|
418 |
|
|
/**
|
419 |
|
|
* @brief Sets the address of the USART node.
|
420 |
|
|
* @param USARTx: Select the USART peripheral.
|
421 |
|
|
* This parameter can be one of the following values:
|
422 |
|
|
* USART1, USART2 or USART3.
|
423 |
|
|
* @param USART_Address: Indicates the address of the USART node.
|
424 |
|
|
* @retval None
|
425 |
|
|
*/
|
426 |
|
|
void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address)
|
427 |
|
|
{
|
428 |
|
|
/* Check the parameters */
|
429 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
430 |
|
|
assert_param(IS_USART_ADDRESS(USART_Address));
|
431 |
|
|
|
432 |
|
|
/* Clear the USART address */
|
433 |
|
|
USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_ADD);
|
434 |
|
|
/* Set the USART address node */
|
435 |
|
|
USARTx->CR2 |= USART_Address;
|
436 |
|
|
}
|
437 |
|
|
|
438 |
|
|
/**
|
439 |
|
|
* @brief Selects the USART WakeUp method.
|
440 |
|
|
* @param USARTx: Select the USART peripheral.
|
441 |
|
|
* This parameter can be one of the following values:
|
442 |
|
|
* USART1, USART2 or USART3.
|
443 |
|
|
* @param USART_WakeUp: specifies the USART wakeup method.
|
444 |
|
|
* This parameter can be one of the following values:
|
445 |
|
|
* @arg USART_WakeUp_IdleLine: WakeUp by an idle line detection
|
446 |
|
|
* @arg USART_WakeUp_AddressMark: WakeUp by an address mark
|
447 |
|
|
* @retval None
|
448 |
|
|
*/
|
449 |
|
|
void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp)
|
450 |
|
|
{
|
451 |
|
|
/* Check the parameters */
|
452 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
453 |
|
|
assert_param(IS_USART_WAKEUP(USART_WakeUp));
|
454 |
|
|
|
455 |
|
|
USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_WAKE);
|
456 |
|
|
USARTx->CR1 |= USART_WakeUp;
|
457 |
|
|
}
|
458 |
|
|
|
459 |
|
|
/**
|
460 |
|
|
* @brief Determines if the USART is in mute mode or not.
|
461 |
|
|
* @param USARTx: Select the USART peripheral.
|
462 |
|
|
* This parameter can be one of the following values:
|
463 |
|
|
* USART1, USART2 or USART3.
|
464 |
|
|
* @param NewState: new state of the USART mute mode.
|
465 |
|
|
* This parameter can be: ENABLE or DISABLE.
|
466 |
|
|
* @retval None
|
467 |
|
|
*/
|
468 |
|
|
void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
469 |
|
|
{
|
470 |
|
|
/* Check the parameters */
|
471 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
472 |
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
473 |
|
|
|
474 |
|
|
if (NewState != DISABLE)
|
475 |
|
|
{
|
476 |
|
|
/* Enable the USART mute mode by setting the RWU bit in the CR1 register */
|
477 |
|
|
USARTx->CR1 |= USART_CR1_RWU;
|
478 |
|
|
}
|
479 |
|
|
else
|
480 |
|
|
{
|
481 |
|
|
/* Disable the USART mute mode by clearing the RWU bit in the CR1 register */
|
482 |
|
|
USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_RWU);
|
483 |
|
|
}
|
484 |
|
|
}
|
485 |
|
|
|
486 |
|
|
/**
|
487 |
|
|
* @brief Sets the USART LIN Break detection length.
|
488 |
|
|
* @param USARTx: Select the USART peripheral.
|
489 |
|
|
* This parameter can be one of the following values:
|
490 |
|
|
* USART1, USART2 or USART3.
|
491 |
|
|
* @param USART_LINBreakDetectLength: specifies the LIN break detection length.
|
492 |
|
|
* This parameter can be one of the following values:
|
493 |
|
|
* @arg USART_LINBreakDetectLength_10b: 10-bit break detection
|
494 |
|
|
* @arg USART_LINBreakDetectLength_11b: 11-bit break detection
|
495 |
|
|
* @retval None
|
496 |
|
|
*/
|
497 |
|
|
void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength)
|
498 |
|
|
{
|
499 |
|
|
/* Check the parameters */
|
500 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
501 |
|
|
assert_param(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength));
|
502 |
|
|
|
503 |
|
|
USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LBDL);
|
504 |
|
|
USARTx->CR2 |= USART_LINBreakDetectLength;
|
505 |
|
|
}
|
506 |
|
|
|
507 |
|
|
/**
|
508 |
|
|
* @brief Enables or disables the USART’s LIN mode.
|
509 |
|
|
* @param USARTx: Select the USART peripheral.
|
510 |
|
|
* This parameter can be one of the following values:
|
511 |
|
|
* USART1, USART2 or USART3.
|
512 |
|
|
* @param NewState: new state of the USART LIN mode.
|
513 |
|
|
* This parameter can be: ENABLE or DISABLE.
|
514 |
|
|
* @retval None
|
515 |
|
|
*/
|
516 |
|
|
void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
517 |
|
|
{
|
518 |
|
|
/* Check the parameters */
|
519 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
520 |
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
521 |
|
|
|
522 |
|
|
if (NewState != DISABLE)
|
523 |
|
|
{
|
524 |
|
|
/* Enable the LIN mode by setting the LINEN bit in the CR2 register */
|
525 |
|
|
USARTx->CR2 |= USART_CR2_LINEN;
|
526 |
|
|
}
|
527 |
|
|
else
|
528 |
|
|
{
|
529 |
|
|
/* Disable the LIN mode by clearing the LINEN bit in the CR2 register */
|
530 |
|
|
USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LINEN);
|
531 |
|
|
}
|
532 |
|
|
}
|
533 |
|
|
|
534 |
|
|
/**
|
535 |
|
|
* @brief Transmits single data through the USARTx peripheral.
|
536 |
|
|
* @param USARTx: Select the USART peripheral.
|
537 |
|
|
* This parameter can be one of the following values:
|
538 |
|
|
* USART1, USART2 or USART3.
|
539 |
|
|
* @param Data: the data to transmit.
|
540 |
|
|
* @retval None
|
541 |
|
|
*/
|
542 |
|
|
void USART_SendData(USART_TypeDef* USARTx, uint16_t Data)
|
543 |
|
|
{
|
544 |
|
|
/* Check the parameters */
|
545 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
546 |
|
|
assert_param(IS_USART_DATA(Data));
|
547 |
|
|
|
548 |
|
|
/* Transmit Data */
|
549 |
|
|
USARTx->DR = (Data & (uint16_t)0x01FF);
|
550 |
|
|
}
|
551 |
|
|
|
552 |
|
|
/**
|
553 |
|
|
* @brief Returns the most recent received data by the USARTx peripheral.
|
554 |
|
|
* @param USARTx: Select the USART peripheral.
|
555 |
|
|
* This parameter can be one of the following values:
|
556 |
|
|
* USART1, USART2 or USART3.
|
557 |
|
|
* @retval The received data.
|
558 |
|
|
*/
|
559 |
|
|
uint16_t USART_ReceiveData(USART_TypeDef* USARTx)
|
560 |
|
|
{
|
561 |
|
|
/* Check the parameters */
|
562 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
563 |
|
|
|
564 |
|
|
/* Receive Data */
|
565 |
|
|
return (uint16_t)(USARTx->DR & (uint16_t)0x01FF);
|
566 |
|
|
}
|
567 |
|
|
|
568 |
|
|
/**
|
569 |
|
|
* @brief Transmits break characters.
|
570 |
|
|
* @param USARTx: Select the USART peripheral.
|
571 |
|
|
* This parameter can be one of the following values:
|
572 |
|
|
* USART1, USART2 or USART3.
|
573 |
|
|
* @retval None
|
574 |
|
|
*/
|
575 |
|
|
void USART_SendBreak(USART_TypeDef* USARTx)
|
576 |
|
|
{
|
577 |
|
|
/* Check the parameters */
|
578 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
579 |
|
|
|
580 |
|
|
/* Send break characters */
|
581 |
|
|
USARTx->CR1 |= USART_CR1_SBK;
|
582 |
|
|
}
|
583 |
|
|
|
584 |
|
|
/**
|
585 |
|
|
* @brief Sets the specified USART guard time.
|
586 |
|
|
* @param USARTx: Select the USART peripheral.
|
587 |
|
|
* This parameter can be one of the following values:
|
588 |
|
|
* USART1, USART2 or USART3.
|
589 |
|
|
* @param USART_GuardTime: specifies the guard time.
|
590 |
|
|
* @note The guard time bits are not available for UART4 and UART5.
|
591 |
|
|
* @retval None
|
592 |
|
|
*/
|
593 |
|
|
void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime)
|
594 |
|
|
{
|
595 |
|
|
/* Check the parameters */
|
596 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
597 |
|
|
|
598 |
|
|
/* Clear the USART Guard time */
|
599 |
|
|
USARTx->GTPR &= USART_GTPR_PSC;
|
600 |
|
|
/* Set the USART guard time */
|
601 |
|
|
USARTx->GTPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08);
|
602 |
|
|
}
|
603 |
|
|
|
604 |
|
|
/**
|
605 |
|
|
* @brief Sets the system clock prescaler.
|
606 |
|
|
* @param USARTx: Select the USART peripheral.
|
607 |
|
|
* This parameter can be one of the following values:
|
608 |
|
|
* USART1, USART2 or USART3.
|
609 |
|
|
* @param USART_Prescaler: specifies the prescaler clock.
|
610 |
|
|
* @note The function is used for IrDA mode with UART4 and UART5.
|
611 |
|
|
* @retval None
|
612 |
|
|
*/
|
613 |
|
|
void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler)
|
614 |
|
|
{
|
615 |
|
|
/* Check the parameters */
|
616 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
617 |
|
|
|
618 |
|
|
/* Clear the USART prescaler */
|
619 |
|
|
USARTx->GTPR &= USART_GTPR_GT;
|
620 |
|
|
/* Set the USART prescaler */
|
621 |
|
|
USARTx->GTPR |= USART_Prescaler;
|
622 |
|
|
}
|
623 |
|
|
|
624 |
|
|
/**
|
625 |
|
|
* @brief Enables or disables the USART’s Smart Card mode.
|
626 |
|
|
* @param USARTx: Select the USART peripheral.
|
627 |
|
|
* This parameter can be one of the following values:
|
628 |
|
|
* USART1, USART2 or USART3.
|
629 |
|
|
* @param NewState: new state of the Smart Card mode.
|
630 |
|
|
* This parameter can be: ENABLE or DISABLE.
|
631 |
|
|
* @note The Smart Card mode is not available for UART4 and UART5.
|
632 |
|
|
* @retval None
|
633 |
|
|
*/
|
634 |
|
|
void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
635 |
|
|
{
|
636 |
|
|
/* Check the parameters */
|
637 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
638 |
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
639 |
|
|
if (NewState != DISABLE)
|
640 |
|
|
{
|
641 |
|
|
/* Enable the SC mode by setting the SCEN bit in the CR3 register */
|
642 |
|
|
USARTx->CR3 |= USART_CR3_SCEN;
|
643 |
|
|
}
|
644 |
|
|
else
|
645 |
|
|
{
|
646 |
|
|
/* Disable the SC mode by clearing the SCEN bit in the CR3 register */
|
647 |
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_SCEN);
|
648 |
|
|
}
|
649 |
|
|
}
|
650 |
|
|
|
651 |
|
|
/**
|
652 |
|
|
* @brief Enables or disables NACK transmission.
|
653 |
|
|
* @param USARTx: Select the USART peripheral.
|
654 |
|
|
* This parameter can be one of the following values:
|
655 |
|
|
* USART1, USART2 or USART3.
|
656 |
|
|
* @param NewState: new state of the NACK transmission.
|
657 |
|
|
* This parameter can be: ENABLE or DISABLE.
|
658 |
|
|
* @note The Smart Card mode is not available for UART4 and UART5.
|
659 |
|
|
* @retval None
|
660 |
|
|
*/
|
661 |
|
|
void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
662 |
|
|
{
|
663 |
|
|
/* Check the parameters */
|
664 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
665 |
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
666 |
|
|
if (NewState != DISABLE)
|
667 |
|
|
{
|
668 |
|
|
/* Enable the NACK transmission by setting the NACK bit in the CR3 register */
|
669 |
|
|
USARTx->CR3 |= USART_CR3_NACK;
|
670 |
|
|
}
|
671 |
|
|
else
|
672 |
|
|
{
|
673 |
|
|
/* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
|
674 |
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_NACK);
|
675 |
|
|
}
|
676 |
|
|
}
|
677 |
|
|
|
678 |
|
|
/**
|
679 |
|
|
* @brief Enables or disables the USART’s Half Duplex communication.
|
680 |
|
|
* @param USARTx: Select the USART peripheral.
|
681 |
|
|
* This parameter can be one of the following values:
|
682 |
|
|
* USART1, USART2 or USART3.
|
683 |
|
|
* @param NewState: new state of the USART Communication.
|
684 |
|
|
* This parameter can be: ENABLE or DISABLE.
|
685 |
|
|
* @retval None
|
686 |
|
|
*/
|
687 |
|
|
void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
688 |
|
|
{
|
689 |
|
|
/* Check the parameters */
|
690 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
691 |
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
692 |
|
|
|
693 |
|
|
if (NewState != DISABLE)
|
694 |
|
|
{
|
695 |
|
|
/* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */
|
696 |
|
|
USARTx->CR3 |= USART_CR3_HDSEL;
|
697 |
|
|
}
|
698 |
|
|
else
|
699 |
|
|
{
|
700 |
|
|
/* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */
|
701 |
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_HDSEL);
|
702 |
|
|
}
|
703 |
|
|
}
|
704 |
|
|
|
705 |
|
|
/**
|
706 |
|
|
* @brief Enables or disables the USART's 8x oversampling mode.
|
707 |
|
|
* @param USARTx: Select the USART or the UART peripheral.
|
708 |
|
|
* This parameter can be one of the following values:
|
709 |
|
|
* USART1, USART2, USART3.
|
710 |
|
|
* @param NewState: new state of the USART 8x oversampling mode.
|
711 |
|
|
* This parameter can be: ENABLE or DISABLE.
|
712 |
|
|
*
|
713 |
|
|
* @note
|
714 |
|
|
* This function has to be called before calling USART_Init()
|
715 |
|
|
* function in order to have correct baudrate Divider value.
|
716 |
|
|
* @retval : None
|
717 |
|
|
*/
|
718 |
|
|
void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
719 |
|
|
{
|
720 |
|
|
/* Check the parameters */
|
721 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
722 |
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
723 |
|
|
|
724 |
|
|
if (NewState != DISABLE)
|
725 |
|
|
{
|
726 |
|
|
/* Enable the 8x Oversampling mode by setting the OVER8 bit in the CR1 register */
|
727 |
|
|
USARTx->CR1 |= USART_CR1_OVER8;
|
728 |
|
|
}
|
729 |
|
|
else
|
730 |
|
|
{
|
731 |
|
|
/* Disable the 8x Oversampling mode by clearing the OVER8 bit in the CR1 register */
|
732 |
|
|
USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_OVER8);
|
733 |
|
|
}
|
734 |
|
|
}
|
735 |
|
|
|
736 |
|
|
/**
|
737 |
|
|
* @brief Enables or disables the USART's one bit sampling methode.
|
738 |
|
|
* @param USARTx: Select the USART or the UART peripheral.
|
739 |
|
|
* This parameter can be one of the following values:
|
740 |
|
|
* USART1, USART2, USART3.
|
741 |
|
|
* @param NewState: new state of the USART one bit sampling methode.
|
742 |
|
|
* This parameter can be: ENABLE or DISABLE.
|
743 |
|
|
* @retval : None
|
744 |
|
|
*/
|
745 |
|
|
void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
746 |
|
|
{
|
747 |
|
|
/* Check the parameters */
|
748 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
749 |
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
750 |
|
|
|
751 |
|
|
if (NewState != DISABLE)
|
752 |
|
|
{
|
753 |
|
|
/* Enable the one bit method by setting the ONEBITE bit in the CR3 register */
|
754 |
|
|
USARTx->CR3 |= USART_CR3_ONEBIT;
|
755 |
|
|
}
|
756 |
|
|
else
|
757 |
|
|
{
|
758 |
|
|
/* Disable tthe one bit method by clearing the ONEBITE bit in the CR3 register */
|
759 |
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_ONEBIT);
|
760 |
|
|
}
|
761 |
|
|
}
|
762 |
|
|
|
763 |
|
|
/**
|
764 |
|
|
* @brief Configures the USART’s IrDA interface.
|
765 |
|
|
* @param USARTx: Select the USART peripheral.
|
766 |
|
|
* This parameter can be one of the following values:
|
767 |
|
|
* USART1, USART2 or USART3.
|
768 |
|
|
* @param USART_IrDAMode: specifies the IrDA mode.
|
769 |
|
|
* This parameter can be one of the following values:
|
770 |
|
|
* @arg USART_IrDAMode_LowPower
|
771 |
|
|
* @arg USART_IrDAMode_Normal
|
772 |
|
|
* @retval None
|
773 |
|
|
*/
|
774 |
|
|
void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode)
|
775 |
|
|
{
|
776 |
|
|
/* Check the parameters */
|
777 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
778 |
|
|
assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));
|
779 |
|
|
|
780 |
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IRLP);
|
781 |
|
|
USARTx->CR3 |= USART_IrDAMode;
|
782 |
|
|
}
|
783 |
|
|
|
784 |
|
|
/**
|
785 |
|
|
* @brief Enables or disables the USART’s IrDA interface.
|
786 |
|
|
* @param USARTx: Select the USART peripheral.
|
787 |
|
|
* This parameter can be one of the following values:
|
788 |
|
|
* USART1, USART2 or USART3.
|
789 |
|
|
* @param NewState: new state of the IrDA mode.
|
790 |
|
|
* This parameter can be: ENABLE or DISABLE.
|
791 |
|
|
* @retval None
|
792 |
|
|
*/
|
793 |
|
|
void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)
|
794 |
|
|
{
|
795 |
|
|
/* Check the parameters */
|
796 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
797 |
|
|
assert_param(IS_FUNCTIONAL_STATE(NewState));
|
798 |
|
|
|
799 |
|
|
if (NewState != DISABLE)
|
800 |
|
|
{
|
801 |
|
|
/* Enable the IrDA mode by setting the IREN bit in the CR3 register */
|
802 |
|
|
USARTx->CR3 |= USART_CR3_IREN;
|
803 |
|
|
}
|
804 |
|
|
else
|
805 |
|
|
{
|
806 |
|
|
/* Disable the IrDA mode by clearing the IREN bit in the CR3 register */
|
807 |
|
|
USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IREN);
|
808 |
|
|
}
|
809 |
|
|
}
|
810 |
|
|
|
811 |
|
|
/**
|
812 |
|
|
* @brief Checks whether the specified USART flag is set or not.
|
813 |
|
|
* @param USARTx: Select the USART peripheral.
|
814 |
|
|
* This parameter can be one of the following values:
|
815 |
|
|
* USART1, USART2 or USART3.
|
816 |
|
|
* @param USART_FLAG: specifies the flag to check.
|
817 |
|
|
* This parameter can be one of the following values:
|
818 |
|
|
* @arg USART_FLAG_CTS: CTS Change flag
|
819 |
|
|
* @arg USART_FLAG_LBD: LIN Break detection flag
|
820 |
|
|
* @arg USART_FLAG_TXE: Transmit data register empty flag
|
821 |
|
|
* @arg USART_FLAG_TC: Transmission Complete flag
|
822 |
|
|
* @arg USART_FLAG_RXNE: Receive data register not empty flag
|
823 |
|
|
* @arg USART_FLAG_IDLE: Idle Line detection flag
|
824 |
|
|
* @arg USART_FLAG_ORE: OverRun Error flag
|
825 |
|
|
* @arg USART_FLAG_NE: Noise Error flag
|
826 |
|
|
* @arg USART_FLAG_FE: Framing Error flag
|
827 |
|
|
* @arg USART_FLAG_PE: Parity Error flag
|
828 |
|
|
* @retval The new state of USART_FLAG (SET or RESET).
|
829 |
|
|
*/
|
830 |
|
|
FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG)
|
831 |
|
|
{
|
832 |
|
|
FlagStatus bitstatus = RESET;
|
833 |
|
|
/* Check the parameters */
|
834 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
835 |
|
|
assert_param(IS_USART_FLAG(USART_FLAG));
|
836 |
|
|
|
837 |
|
|
if ((USARTx->SR & USART_FLAG) != (uint16_t)RESET)
|
838 |
|
|
{
|
839 |
|
|
bitstatus = SET;
|
840 |
|
|
}
|
841 |
|
|
else
|
842 |
|
|
{
|
843 |
|
|
bitstatus = RESET;
|
844 |
|
|
}
|
845 |
|
|
return bitstatus;
|
846 |
|
|
}
|
847 |
|
|
|
848 |
|
|
/**
|
849 |
|
|
* @brief Clears the USARTx's pending flags.
|
850 |
|
|
* @param USARTx: Select the USART peripheral.
|
851 |
|
|
* This parameter can be one of the following values:
|
852 |
|
|
* USART1, USART2 or USART3.
|
853 |
|
|
* @param USART_FLAG: specifies the flag to clear.
|
854 |
|
|
* This parameter can be any combination of the following values:
|
855 |
|
|
* @arg USART_FLAG_CTS: CTS Change flag.
|
856 |
|
|
* @arg USART_FLAG_LBD: LIN Break detection flag.
|
857 |
|
|
* @arg USART_FLAG_TC: Transmission Complete flag.
|
858 |
|
|
* @arg USART_FLAG_RXNE: Receive data register not empty flag.
|
859 |
|
|
*
|
860 |
|
|
* @note
|
861 |
|
|
* - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun
|
862 |
|
|
* error) and IDLE (Idle line detected) flags are cleared by software
|
863 |
|
|
* sequence: a read operation to USART_SR register (USART_GetFlagStatus())
|
864 |
|
|
* followed by a read operation to USART_DR register (USART_ReceiveData()).
|
865 |
|
|
* - RXNE flag can be also cleared by a read to the USART_DR register
|
866 |
|
|
* (USART_ReceiveData()).
|
867 |
|
|
* - TC flag can be also cleared by software sequence: a read operation to
|
868 |
|
|
* USART_SR register (USART_GetFlagStatus()) followed by a write operation
|
869 |
|
|
* to USART_DR register (USART_SendData()).
|
870 |
|
|
* - TXE flag is cleared only by a write to the USART_DR register
|
871 |
|
|
* (USART_SendData()).
|
872 |
|
|
* @retval None
|
873 |
|
|
*/
|
874 |
|
|
void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG)
|
875 |
|
|
{
|
876 |
|
|
/* Check the parameters */
|
877 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
878 |
|
|
assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));
|
879 |
|
|
|
880 |
|
|
USARTx->SR = (uint16_t)~USART_FLAG;
|
881 |
|
|
}
|
882 |
|
|
|
883 |
|
|
/**
|
884 |
|
|
* @brief Checks whether the specified USART interrupt has occurred or not.
|
885 |
|
|
* @param USARTx: Select the USART peripheral.
|
886 |
|
|
* This parameter can be one of the following values:
|
887 |
|
|
* USART1, USART2 or USART3.
|
888 |
|
|
* @param USART_IT: specifies the USART interrupt source to check.
|
889 |
|
|
* This parameter can be one of the following values:
|
890 |
|
|
* @arg USART_IT_CTS: CTS change interrupt
|
891 |
|
|
* @arg USART_IT_LBD: LIN Break detection interrupt
|
892 |
|
|
* @arg USART_IT_TXE: Tansmit Data Register empty interrupt
|
893 |
|
|
* @arg USART_IT_TC: Transmission complete interrupt
|
894 |
|
|
* @arg USART_IT_RXNE: Receive Data register not empty interrupt
|
895 |
|
|
* @arg USART_IT_IDLE: Idle line detection interrupt
|
896 |
|
|
* @arg USART_IT_ORE: OverRun Error interrupt
|
897 |
|
|
* @arg USART_IT_NE: Noise Error interrupt
|
898 |
|
|
* @arg USART_IT_FE: Framing Error interrupt
|
899 |
|
|
* @arg USART_IT_PE: Parity Error interrupt
|
900 |
|
|
* @retval The new state of USART_IT (SET or RESET).
|
901 |
|
|
*/
|
902 |
|
|
ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT)
|
903 |
|
|
{
|
904 |
|
|
uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00;
|
905 |
|
|
ITStatus bitstatus = RESET;
|
906 |
|
|
/* Check the parameters */
|
907 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
908 |
|
|
assert_param(IS_USART_GET_IT(USART_IT));
|
909 |
|
|
|
910 |
|
|
/* Get the USART register index */
|
911 |
|
|
usartreg = (((uint8_t)USART_IT) >> 0x05);
|
912 |
|
|
/* Get the interrupt position */
|
913 |
|
|
itmask = USART_IT & IT_MASK;
|
914 |
|
|
itmask = (uint32_t)0x01 << itmask;
|
915 |
|
|
|
916 |
|
|
if (usartreg == 0x01) /* The IT is in CR1 register */
|
917 |
|
|
{
|
918 |
|
|
itmask &= USARTx->CR1;
|
919 |
|
|
}
|
920 |
|
|
else if (usartreg == 0x02) /* The IT is in CR2 register */
|
921 |
|
|
{
|
922 |
|
|
itmask &= USARTx->CR2;
|
923 |
|
|
}
|
924 |
|
|
else /* The IT is in CR3 register */
|
925 |
|
|
{
|
926 |
|
|
itmask &= USARTx->CR3;
|
927 |
|
|
}
|
928 |
|
|
|
929 |
|
|
bitpos = USART_IT >> 0x08;
|
930 |
|
|
bitpos = (uint32_t)0x01 << bitpos;
|
931 |
|
|
bitpos &= USARTx->SR;
|
932 |
|
|
if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET))
|
933 |
|
|
{
|
934 |
|
|
bitstatus = SET;
|
935 |
|
|
}
|
936 |
|
|
else
|
937 |
|
|
{
|
938 |
|
|
bitstatus = RESET;
|
939 |
|
|
}
|
940 |
|
|
|
941 |
|
|
return bitstatus;
|
942 |
|
|
}
|
943 |
|
|
|
944 |
|
|
/**
|
945 |
|
|
* @brief Clears the USARTx’s interrupt pending bits.
|
946 |
|
|
* @param USARTx: Select the USART peripheral.
|
947 |
|
|
* This parameter can be one of the following values:
|
948 |
|
|
* USART1, USART2 or USART3.
|
949 |
|
|
* @param USART_IT: specifies the interrupt pending bit to clear.
|
950 |
|
|
* This parameter can be one of the following values:
|
951 |
|
|
* @arg USART_IT_CTS: CTS change interrupt
|
952 |
|
|
* @arg USART_IT_LBD: LIN Break detection interrupt
|
953 |
|
|
* @arg USART_IT_TC: Transmission complete interrupt.
|
954 |
|
|
* @arg USART_IT_RXNE: Receive Data register not empty interrupt.
|
955 |
|
|
*
|
956 |
|
|
* @note
|
957 |
|
|
* - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun
|
958 |
|
|
* error) and IDLE (Idle line detected) pending bits are cleared by
|
959 |
|
|
* software sequence: a read operation to USART_SR register
|
960 |
|
|
* (USART_GetITStatus()) followed by a read operation to USART_DR register
|
961 |
|
|
* (USART_ReceiveData()).
|
962 |
|
|
* - RXNE pending bit can be also cleared by a read to the USART_DR register
|
963 |
|
|
* (USART_ReceiveData()).
|
964 |
|
|
* - TC pending bit can be also cleared by software sequence: a read
|
965 |
|
|
* operation to USART_SR register (USART_GetITStatus()) followed by a write
|
966 |
|
|
* operation to USART_DR register (USART_SendData()).
|
967 |
|
|
* - TXE pending bit is cleared only by a write to the USART_DR register
|
968 |
|
|
* (USART_SendData()).
|
969 |
|
|
* @retval None
|
970 |
|
|
*/
|
971 |
|
|
void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT)
|
972 |
|
|
{
|
973 |
|
|
uint16_t bitpos = 0x00, itmask = 0x00;
|
974 |
|
|
/* Check the parameters */
|
975 |
|
|
assert_param(IS_USART_ALL_PERIPH(USARTx));
|
976 |
|
|
assert_param(IS_USART_CLEAR_IT(USART_IT));
|
977 |
|
|
|
978 |
|
|
bitpos = USART_IT >> 0x08;
|
979 |
|
|
itmask = ((uint16_t)0x01 << (uint16_t)bitpos);
|
980 |
|
|
USARTx->SR = (uint16_t)~itmask;
|
981 |
|
|
}
|
982 |
|
|
|
983 |
|
|
/**
|
984 |
|
|
* @}
|
985 |
|
|
*/
|
986 |
|
|
|
987 |
|
|
/**
|
988 |
|
|
* @}
|
989 |
|
|
*/
|
990 |
|
|
|
991 |
|
|
/**
|
992 |
|
|
* @}
|
993 |
|
|
*/
|
994 |
|
|
|
995 |
|
|
/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/
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