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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM7_STR75x_GCC/] [STLibrary/] [src/] [75x_uart.c] - Rev 609
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/******************** (C) COPYRIGHT 2006 STMicroelectronics ******************** * File Name : 75x_uart.c * Author : MCD Application Team * Date First Issued : 03/10/2006 * Description : This file provides all the UART software functions. ******************************************************************************** * History: * 07/17/2006 : V1.0 * 03/10/2006 : V0.1 ******************************************************************************** * THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. * AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, * INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE * CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING * INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. *******************************************************************************/ /* Includes ------------------------------------------------------------------*/ #include "75x_uart.h" #include "75x_mrcc.h" /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* UART LIN Mask */ #define UART_LIN_Disable_Mask 0xFEFF /* LIN Disable Mask */ #define UART_LIN_Enable_Mask 0x0100 /* LIN Enable Mask */ /* UART Mask */ #define UART_Enable_Mask 0x0001 /* UART Enable Mask */ #define UART_Disable_Mask 0xFFFE /* UART Disable Mask */ /* UART LoopBack */ #define UART_LoopBack_Disable_Mask 0xFF7F/* LoopBack Disable Mask */ #define UART_LoopBack_Enable_Mask 0x0080/* LoopBack Enable Mask */ #define UART_WordLength_Mask 0xFF9F /* UART Word Length Mask */ #define UART_Parity_Mask 0xFF79 /* UART Parity Mask */ #define UART_HardwareFlowControl_Mask 0x3FFF /* UART Hardware Flow Control Mask */ #define UART_TxRxFIFOLevel_Mask 0xFFC0 /* UART Tx Rx FIFO Level Mask */ #define UART_LINBreakLength_Mask 0xE1FF /* UART LIN Break Length Mask */ #define UART_BreakChar_Mask 0x0001 /* UART Break Character send Mask */ #define UART_FLAG_Mask 0x1F /* UART Flag Mask */ #define UART_Mode_Mask 0xFCFF /* UART Mode Mask */ #define UART_RTSSET_Mask 0xF7FF /* RTS signal is high */ #define UART_RTSRESET_Mask 0x0800 /* RTS signal is low */ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ /* Private functions ---------------------------------------------------------*/ /******************************************************************************* * Function Name : UART_DeInit * Description : Deinitializes the UARTx peripheral registers to their default * reset values. * Input : UARTx: where x can be 0,1 or 2 to select the UART peripheral. * Output : None * Return : None *******************************************************************************/ void UART_DeInit(UART_TypeDef* UARTx) { /* Reset the UARTx registers values */ if(UARTx == UART0) { MRCC_PeripheralSWResetConfig(MRCC_Peripheral_UART0,ENABLE); MRCC_PeripheralSWResetConfig(MRCC_Peripheral_UART0,DISABLE); } else if(UARTx == UART1) { MRCC_PeripheralSWResetConfig(MRCC_Peripheral_UART1,ENABLE); MRCC_PeripheralSWResetConfig(MRCC_Peripheral_UART1,DISABLE); } else if(UARTx == UART2) { MRCC_PeripheralSWResetConfig(MRCC_Peripheral_UART2,ENABLE); MRCC_PeripheralSWResetConfig(MRCC_Peripheral_UART2,DISABLE); } } /******************************************************************************* * Function Name : UART_Init * Description : Initializes the UARTx peripheral according to the specified * parameters in the UART_InitStruct . * Input : - UARTx: where x can be 0,1or 2 to select the UART peripheral. * - UART_InitStruct: pointer to a UART_InitTypeDef structure * that contains the configuration information for the * specified UART peripheral. * Output : None * Return : None *******************************************************************************/ void UART_Init(UART_TypeDef* UARTx, UART_InitTypeDef* UART_InitStruct) { u32 APBClock = 0; u32 IntegerDivider = 0; u32 FractionalDivider = 0; MRCC_ClocksTypeDef MRCC_ClocksStatus; /* Clear the WLEN bits */ UARTx->LCR &= UART_WordLength_Mask; /* Set the WLEN bits according to UART_WordLength value */ UARTx->LCR |= UART_InitStruct->UART_WordLength; /* Choose Stop Bits */ if(UART_InitStruct->UART_StopBits == UART_StopBits_1) { /* One Stop Bit */ UARTx->LCR &= UART_StopBits_1; } else { /* Two Stop Bits */ UARTx->LCR |= UART_StopBits_2; } /* Clear SPS, EPS and PEN bits */ UARTx->LCR &= UART_Parity_Mask; /* Set PS, EPS and PEN bits according to UART_Parity value */ UARTx->LCR |= UART_InitStruct->UART_Parity; /* Configure the BaudRate --------------------------------------------------*/ /* Get the APB frequency */ MRCC_GetClocksStatus(&MRCC_ClocksStatus); APBClock = MRCC_ClocksStatus.PCLK_Frequency; /* Determine the integer part */ IntegerDivider = ((100) * (APBClock) / (16 * (UART_InitStruct->UART_BaudRate))); UARTx->IBRD = IntegerDivider / 100; /* Determine the fractional part */ FractionalDivider = IntegerDivider - (100 * (UARTx->IBRD)); UARTx->FBRD = ((((FractionalDivider * 64) + 50) / 100)); /* Choose the Hardware Flow Control */ /* Clear RTSEn and CTSEn bits */ UARTx->CR &= UART_HardwareFlowControl_Mask; /* Set RTSEn and CTSEn bits according to UART_HardwareFlowControl value */ UARTx->CR |= UART_InitStruct->UART_HardwareFlowControl; /* Configure the UART mode */ /* Clear TXE and RXE bits */ UARTx->CR &= UART_Mode_Mask; /* Set TXE and RXE bits according to UART_Mode value */ UARTx->CR |= UART_InitStruct->UART_Mode; /* Enable or disable the FIFOs */ /* Set the FIFOs Levels */ if(UART_InitStruct->UART_FIFO == UART_FIFO_Enable) { /* Enable the FIFOs */ UARTx->LCR |= UART_FIFO_Enable; /* Clear TXIFLSEL and RXIFLSEL bits */ UARTx->IFLS &= UART_TxRxFIFOLevel_Mask; /* Set RXIFLSEL bits according to UART_RxFIFOLevel value */ UARTx->IFLS |= (UART_InitStruct->UART_RxFIFOLevel << 3); /* Set TXIFLSEL bits according to UART_TxFIFOLevel value */ UARTx->IFLS |= UART_InitStruct->UART_TxFIFOLevel; } else { /* Disable the FIFOs */ UARTx->LCR &= UART_FIFO_Disable; } } /******************************************************************************* * Function Name : UART_StructInit * Description : Fills each UART_InitStruct member with its default value. * Input : UART_InitStruct: pointer to a UART_InitTypeDef structure which * will be initialized. * Output : None * Return : None *******************************************************************************/ void UART_StructInit(UART_InitTypeDef* UART_InitStruct) { /* UART_InitStruct members default value */ UART_InitStruct->UART_WordLength = UART_WordLength_8D; UART_InitStruct->UART_StopBits = UART_StopBits_1; UART_InitStruct->UART_Parity = UART_Parity_Odd ; UART_InitStruct->UART_BaudRate = 9600; UART_InitStruct->UART_HardwareFlowControl = UART_HardwareFlowControl_None; UART_InitStruct->UART_Mode = UART_Mode_Tx_Rx; UART_InitStruct->UART_FIFO = UART_FIFO_Enable; UART_InitStruct->UART_TxFIFOLevel = UART_FIFOLevel_1_2; UART_InitStruct->UART_RxFIFOLevel = UART_FIFOLevel_1_2; } /******************************************************************************* * Function Name : UART_Cmd * Description : Enables or disables the specified UART peripheral. * Input : - UARTx: where x can be 0,1 or 2 to select the UART peripheral * - NewState: new state of the UARTx peripheral. * This parameter can be: ENABLE or DISABLE. * Output : None * Return : None *******************************************************************************/ void UART_Cmd(UART_TypeDef* UARTx, FunctionalState NewState) { if (NewState == ENABLE) { /* Enable the selected UART by setting the UARTEN bit in the CR register */ UARTx->CR |= UART_Enable_Mask; } else { /* Disable the selected UART by clearing the UARTEN bit in the CR register */ UARTx->CR &= UART_Disable_Mask; } } /******************************************************************************* * Function Name : UART_ITConfig * Description : Enables or disables the specified UART interrupts. * Input : - UARTx: where x can be 0,1 or 2 to select the UART peripheral * - UART_IT: specifies the UART interrupts sources to be * enabled or disabled. This parameter can be any combination * of the following values: * - UART_IT_OverrunError: Overrun Error interrupt * - UART_IT_BreakError: Break Error interrupt * - UART_IT_ParityError: Parity Error interrupt * - UART_IT_FrameError: Frame Error interrupt * - UART_IT_ReceiveTimeOut: Receive Time Out interrupt * - UART_IT_Transmit: Transmit interrupt * - UART_IT_Receive: Receive interrupt * - UART_IT_CTS: CTS interrupt * - NewState: new state of the UARTx peripheral. * This parameter can be: ENABLE or DISABLE. * Output : None * Return : None *******************************************************************************/ void UART_ITConfig(UART_TypeDef* UARTx, u16 UART_IT, FunctionalState NewState) { if(NewState == ENABLE) { /* Enables the selected interrupts */ UARTx->IMSC |= UART_IT; } else { /* Disables the selected interrupts */ UARTx->IMSC &= ~UART_IT; } } /******************************************************************************* * Function Name : UART_DMAConfig * Description : Configures the UART0 DMA interface. * Input : - UART0_DMAtransfer : specifies the configuration of DMA request. * This parameter can be: * - UART0_DMATransfer_Single: Single DMA transfer * - UART0_DMATransfer_Burst: Burst DMA transfer * - UART0_DMAOnError: specifies the DMA on error request. * This parameter can be: * - UART0_DMAOnError_Enable: DMA receive request enabled * when the UART error interrupt is asserted. * - UART0_DMAOnError_Disable: DMA receive request disabled * when the UART error interrupt is asserted. * Output : None * Return : None *******************************************************************************/ void UART_DMAConfig(u16 UART0_DMATransfer, u16 UART0_DMAOnError) { if(UART0_DMATransfer == UART0_DMATransfer_Single) { /* Configure the DMA request from the UART0 as single transfer */ UART0->DMACR &= UART0_DMATransfer_Single; } else { UART0->DMACR |= UART0_DMATransfer_Burst; } if(UART0_DMAOnError == UART0_DMAOnError_Enable) { UART0->DMACR &= UART0_DMAOnError_Enable; } else { UART0->DMACR |= UART0_DMAOnError_Disable; } } /******************************************************************************* * Function Name : UART_DMACmd * Description : Enables or disables the UART0’s DMA interface. * Input : - UART0_DMAReq: specifies the DMA request. * This parameter can be: * - UART0_DMAReq_Tx: Transmit DMA request * - UART0_DMAReq_Rx: Receive DMA request * - NewState: new state of the UART0’s DMA request. * This parameter can be: ENABLE or DISABLE. * Output : None * Return : None *******************************************************************************/ void UART_DMACmd(u16 UART0_DMAReq, FunctionalState NewState) { if(UART0_DMAReq == UART0_DMAReq_Tx) { if(NewState == ENABLE) { UART0->DMACR |= UART0_DMAReq_Tx; } else { UART0->DMACR &= ~UART0_DMAReq_Tx; } } else { if(NewState == ENABLE) { UART0->DMACR |= UART0_DMAReq_Rx; } else { UART0->DMACR &= ~UART0_DMAReq_Rx; } } } /******************************************************************************* * Function Name : UART_LoopBackConfig * Description : Enables or disables LoopBack mode in UARTx. * Input : - UARTx: where x can be 0,1 or 2 to select the UART peripheral * - NewState: new state of the UARTx’s LoopBack mode. * This parameter can be: ENABLE or DISABLE. * Output : None * Return : None *******************************************************************************/ void UART_LoopBackConfig(UART_TypeDef* UARTx, FunctionalState NewState) { if (NewState == ENABLE) { /* Enable the LoopBack mode of the specified UART */ UARTx->CR |= UART_LoopBack_Enable_Mask; } else { /* Disable the LoopBack mode of the specified UART */ UARTx->CR &= UART_LoopBack_Disable_Mask; } } /******************************************************************************* * Function Name : UART_LINConfig * Description : Sets the LIN break length. * Input : - UARTx: where x can be 0,1 or 2 to select the UART peripheral. * - UART_LINBreakLength: Break length value. * This parameter can be: * - UART_LINBreakLength_10: 10 low bits * - UART_LINBreakLength_11: 11 low bits * - UART_LINBreakLength_12: 12 low bits * - UART_LINBreakLength_13: 13 low bits * - UART_LINBreakLength_14: 14 low bits * - UART_LINBreakLength_15: 15 low bits * - UART_LINBreakLength_16: 16 low bits * - UART_LINBreakLength_17: 17 low bits * - UART_LINBreakLength_18: 18 low bits * - UART_LINBreakLength_19: 19 low bits * - UART_LINBreakLength_20: 20 low bits * Output : None * Return : None *******************************************************************************/ void UART_LINConfig(UART_TypeDef* UARTx, u16 UART_LINBreakLength) { /* Clear LBKLEN bits */ UARTx->LCR &= UART_LINBreakLength_Mask; /* Set LBKLEN bits according to UART_LINBreakLength value */ UARTx->LCR |= UART_LINBreakLength; } /******************************************************************************* * Function Name : UART_LINCmd * Description : Enables or disables LIN master mode in UARTx. * Input : - UARTx: where x can be 0,1 or 2 to select the UART peripheral * - NewState: new state of the UARTx’s LIN interface. * This parameter can be: ENABLE or DISABLE. * Output : None * Return : None *******************************************************************************/ void UART_LINCmd(UART_TypeDef* UARTx, FunctionalState NewState) { if(NewState == ENABLE) { /* Enable the LIN mode of the specified UART */ UARTx->LCR |= UART_LIN_Enable_Mask; } else { /* Disable the LIN mode of the specified UART */ UARTx->LCR &= UART_LIN_Disable_Mask; } } /******************************************************************************* * Function Name : UART_SendData * Description : Transmits a signle Byte of data through the UARTx peripheral. * Input : - UARTx: where x can be 0,1 or 2 to select the UART peripheral. * - Data: the byte to transmit * Output : None * Return : None *******************************************************************************/ void UART_SendData(UART_TypeDef* UARTx, u8 Data) { /* Transmit one byte */ UARTx->DR = Data; } /******************************************************************************* * Function Name : UART_ReceiveData * Description : Returns the most recent received Byte by the UARTx peripheral. * Input : UARTx: where x can be 0,1 or 2 to select the UART peripheral. * Output : None * Return : The received data *******************************************************************************/ u8 UART_ReceiveData(UART_TypeDef* UARTx) { /* Receive one byte */ return ((u8)UARTx->DR); } /******************************************************************************* * Function Name : UART_SendBreak * Description : Transmits break characters. * Input : UARTx: where x can be 0,1 or 2 to select the UART peripheral. * Output : None * Return : None *******************************************************************************/ void UART_SendBreak(UART_TypeDef* UARTx) { /* Send break characters */ UARTx->BKR |= UART_BreakChar_Mask; } /******************************************************************************* * Function Name : UART_RTSConfig * Description : Sets or Resets the RTS signal * Input : - UARTx: where x can be 0,1 or 2 to select the UART peripheral. * - RTSState: new state of the RTS signal. * This parameter can be: RTSSET or RTSRESET * Output : None * Return : None *******************************************************************************/ void UART_RTSConfig(UART_TypeDef* UARTx, UART_RTSTypeDef RTSState) { if(RTSState == RTSRESET) { UARTx->CR |= UART_RTSRESET_Mask; } else if(RTSState == RTSSET) { UARTx->CR &= UART_RTSSET_Mask; } } /******************************************************************************* * Function Name : UART_GetFlagStatus * Description : Checks whether the specified UART flag is set or not. * Input : - UARTx: where x can be 0,1 or 2 to select the UART peripheral * - UART_FLAG: specifies the flag to check. * This parameter can be one of the following values: * - UART_FLAG_OverrunError: Overrun error flag * - UART_FLAG_Break: break error flag * - UART_FLAG_ParityError: parity error flag * - UART_FLAG_FrameError: frame error flag * - UART_FLAG_TxFIFOEmpty: Transmit FIFO Empty flag * - UART_FLAG_RxFIFOFull: Receive FIFO Full flag * - UART_FLAG_TxFIFOFull: Transmit FIFO Full flag * - UART_FLAG_RxFIFOEmpty: Receive FIFO Empty flag * - UART_FLAG_Busy: Busy flag * - UART_FLAG_CTS: CTS flag * - UART_RawIT_OverrunError: Overrun Error interrupt flag * - UART_RawIT_BreakError: Break Error interrupt flag * - UART_RawIT_ParityError: Parity Error interrupt flag * - UART_RawIT_FrameError: Frame Error interrupt flag * - UART_RawIT_ReceiveTimeOut: ReceiveTimeOut interrupt flag * - UART_RawIT_Transmit: Transmit interrupt flag * - UART_RawIT_Receive: Receive interrupt flag * - UART_RawIT_CTS: CTS interrupt flag * Output : None * Return : The new state of UART_FLAG (SET or RESET). *******************************************************************************/ FlagStatus UART_GetFlagStatus(UART_TypeDef* UARTx, u16 UART_FLAG) { u32 UARTReg = 0, FlagPos = 0; u32 StatusReg = 0; /* Get the UART register index */ UARTReg = UART_FLAG >> 5; /* Get the flag position */ FlagPos = UART_FLAG & UART_FLAG_Mask; if(UARTReg == 1) /* The flag to check is in RSR register */ { StatusReg = UARTx->RSR; } else if (UARTReg == 2) /* The flag to check is in FR register */ { StatusReg = UARTx->FR; } else if(UARTReg == 3) /* The flag to check is in RIS register */ { StatusReg = UARTx->RIS; } if((StatusReg & (1 << FlagPos))!= RESET) { return SET; } else { return RESET; } } /******************************************************************************* * Function Name : UART_ClearFlag * Description : Clears the UARTx’s pending flags. * Input : - UARTx: where x can be 0,1or 2 to select the UART peripheral. * - UART_FLAG: specifies the flag to clear. * This parameter can be one of the following values: * - UART_FLAG_OverrunError: Overrun error flag * - UART_FLAG_Break: break error flag * - UART_FLAG_ParityError: parity error flag * - UART_FLAG_FrameError: frame error flag * Output : None * Return : None *******************************************************************************/ void UART_ClearFlag(UART_TypeDef* UARTx, u16 UART_FLAG) { u8 FlagPos = 0; /* Get the flag position */ FlagPos = UART_FLAG & UART_FLAG_Mask; /* Clear the sepecified flag */ UARTx->RSR &= ~(1 << FlagPos); } /******************************************************************************* * Function Name : UART_GetITStatus * Description : Checks whether the specified UART interrupt has occurred or not. * Input : - UARTx: where x can be 0,1or 2 to select the UART peripheral. * - UART_IT: specifies the interrupt source to check. * This parameter can be one of the following values: * - UART_IT_OverrunError: Overrun Error interrupt * - UART_IT_BreakError: Break Error interrupt * - UART_IT_ParityError: Parity Error interrupt * - UART_IT_FrameError: Frame Error interrupt * - UART_IT_ReceiveTimeOut: Receive Time Out interrupt * - UART_IT_Transmit: Transmit interrupt * - UART_IT_Receive: Receive interrupt * - UART_IT_CTS: CTS interrupt * Output : None * Return : The new state of UART_IT (SET or RESET). *******************************************************************************/ ITStatus UART_GetITStatus(UART_TypeDef* UARTx, u16 UART_IT) { if((UARTx->MIS & UART_IT) != RESET) { return SET; } else { return RESET; } } /******************************************************************************* * Function Name : UART_ClearITPendingBit * Description : Clears the UARTx’s interrupt pending bits. * Input : - UARTx: where x can be 0,1or 2 to select the UART peripheral. * - UART_IT: specifies the interrupt pending bit to clear. * More than one interrupt can be cleared using the “|” operator. * This parameter can be: * - UART_IT_OverrunError: Overrun Error interrupt * - UART_IT_BreakError: Break Error interrupt * - UART_IT_ParityError: Parity Error interrupt * - UART_IT_FrameError: Frame Error interrupt * - UART_IT_ReceiveTimeOut: Receive Time Out interrupt * - UART_IT_Transmit: Transmit interrupt * - UART_IT_Receive: Receive interrupt * - UART_IT_CTS: CTS interrupt * Output : None * Return : None *******************************************************************************/ void UART_ClearITPendingBit(UART_TypeDef* UARTx, u16 UART_IT) { /* Clear the specified interrupt */ UARTx->ICR = UART_IT; } /******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/
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