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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM9_STR91X_IAR/] [Library/] [source/] [91x_uart.c] - Rev 581
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/******************** (C) COPYRIGHT 2006 STMicroelectronics ******************** * File Name : 91x_uart.c * Author : MCD Application Team * Date First Issued : 05/18/2006 : Version 1.0 * Description : This file provides all the UART software functions. ******************************************************************************** * History: * 05/24/2006 : Version 1.1 * 05/18/2006 : Version 1.0 ******************************************************************************** * 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 "91x_uart.h" #include "91x_scu.h" /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* UART IrDA Mask */ #define UART_IrDA_Disable_Mask 0xFFFD /* IrDA Disable Mask */ #define UART_IrDA_Enable_Mask 0x0002 /* IrDA Enable Mask */ #define IrDA_LowPower_Enable_Mask 0x0004 /*IrDA lower power mode enable*/ #define IrDA_LowPower_Disable_Mask 0xFFFB /*IrDA lower power mode enable*/ /* 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_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_RTS_LowLevel_Mask 0x0800 /* RTS signal is low */ #define UART_RTS_HighLevel_Mask 0xF7FF /* RTS signal is High */ #define UART_DTR_LowLevel_Mask 0x0400 /* DTR signal is low */ #define UART_DTR_HighLevel_Mask 0xFBFF /* DTR signal is High */ #define UART_ClearFlag_Mask 0xAA /* Clear Flag Mask */ /* 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) { SCU_APBPeriphReset(__UART0,ENABLE); SCU_APBPeriphReset(__UART0,DISABLE); } else if(UARTx == UART1) { SCU_APBPeriphReset(__UART1,ENABLE); SCU_APBPeriphReset(__UART1,DISABLE); } else if(UARTx == UART2) { SCU_APBPeriphReset(__UART2,ENABLE); SCU_APBPeriphReset(__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) { u64 UART_MainClock = 0; u32 IntegerDivider = 0; u32 FractionalDivider = 0; /* Clear the LCR[6:5] bits */ UARTx->LCR &= UART_WordLength_Mask; /* Set the LCR[6:5] bits according to UART_WordLength value */ UARTx->LCR |= UART_InitStruct->UART_WordLength; /* Choose Stop Bits */ if(UART_InitStruct->UART_StopBits == UART_StopBits_2) { /* 2 Stop Bit */ UARTx->LCR |= UART_StopBits_2; } else { /* One Stop Bits */ UARTx->LCR &= UART_StopBits_1; } /* Configure the Parity */ /* Clear the LCR[7]and LCR[2:1] bits */ UARTx->LCR &= UART_Parity_Mask; /* Set the LCR[7]and LCR[2:1] bits according to UART_Parity value */ UARTx->LCR |= UART_InitStruct->UART_Parity; /* Configure the BaudRate */ UART_MainClock = (SCU_GetMCLKFreqValue())*1000; if((SCU->CLKCNTR & 0x200) != 0x200) { UART_MainClock = UART_MainClock/2; } /* Determine the integer part */ IntegerDivider = ((100) * (UART_MainClock) / (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 the CR[15:14] bits */ UARTx->CR &= UART_HardwareFlowControl_Mask; /* Set the CR[15:14] bits according to UART_HardwareFlowControl value */ UARTx->CR |= UART_InitStruct->UART_HardwareFlowControl; /* Configure the UART mode */ /* Clear the CR[9:8] bits */ UARTx->CR &= UART_Mode_Mask; /* Set the CR[9:8] 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 reset 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) { /* Reset the UART_InitStruct members */ 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_DSR: DSR interrupt * - UART_IT_DCD: DCD interrupt * - UART_IT_CTS: CTS interrupt * - UART_IT_RI: RI 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 UARTxs DMA interface. * Input : - UARTx: where x can be 1 or 2 to select the UART peripheral * - UART_DMAOnError: specifies the DMA on error request. * This parameter can be: * - UART_DMAOnError_Enable: DMA receive request enabled * when the UART error interrupt is asserted. * - UART_DMAOnError_Disable: DMA receive request disabled * when the UART error interrupt is asserted. * Output : None * Return : None *******************************************************************************/ void UART_DMAConfig(UART_TypeDef* UARTx, u16 UART_DMAOnError) { if(UART_DMAOnError == UART_DMAOnError_Enable) { UARTx->DMACR &= UART_DMAOnError_Enable; } else { UARTx->DMACR |= UART_DMAOnError_Disable; } } /******************************************************************************* * Function Name : UART_DMACmd * Description : Enables or disables the UARTxs DMA interface. * Input : - UARTx: where x can be 1 or 2 to select the UART peripheral * - UART_DMAReq: enables or disables the request of DMA from UART. * This parameter can be: * - UART_DMAReq_Tx: Transmit DMA Enable * - UART_DMAReq_Rx: Receive DMA Enable * - NewState: new state of the UARTx peripheral. * This parameter can be: ENABLE or DISABLE. * Output : None * Return : None *******************************************************************************/ void UART_DMACmd(UART_TypeDef* UARTx, u8 UART_DMAReq, FunctionalState NewState) { if(UART_DMAReq == UART_DMAReq_Tx) { if(NewState == ENABLE) { UARTx->DMACR |= UART_DMAReq_Tx; } else { UARTx->DMACR &= ~UART_DMAReq_Tx; } } if(UART_DMAReq == UART_DMAReq_Rx) { if(NewState == ENABLE) { UARTx->DMACR |= UART_DMAReq_Rx; } else { UARTx->DMACR &= ~UART_DMAReq_Rx; } } } /******************************************************************************* * Function Name : UART_LoopBackConfig * Description : Enables or disables the LoopBack mode. * 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_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_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_RI: RI 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: UART Busy flag * - UART_FLAG_CTS: CTS flag * - UART_FLAG_DCD: DCD flag * - UART_FLAG_DSR: DSR 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_DSR: DSR interrupt flag * - UART_RawIT_DCD: DCD interrupt flag * - UART_RawIT_CTS: CTS interrupt flag * - UART_RawIT_RI: RI 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->RSECR; } 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 UARTxs flags(Frame, Parity, Break, Overrun error). * Input : - UARTx: where x can be 0,1or 2 to select the UART peripheral. * Output : None * Return : None *******************************************************************************/ void UART_ClearFlag(UART_TypeDef* UARTx) { /* Clear the flag */ UARTx->RSECR = UART_ClearFlag_Mask; } /******************************************************************************* * Function Name : UART_GetITStatus * Description : Checks whether the specified UART interrupt has occured or not. * Input : - UARTx: where x can be 0,1or 2 to select the UART peripheral. * - UART_IT: specifies the interrupt pending bit to be checked. * 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_DSR: DSR interrupt * - UART_IT_DCD: DCD interrupt * - UART_IT_CTS: CTS interrupt * - UART_IT_RI: RI 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 UARTxs 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_DSR: DSR interrupt * - UART_IT_DCD: DCD interrupt * - UART_IT_CTS: CTS interrupt * - UART_IT_RI: RI interrupt * Output : None * Return : None *******************************************************************************/ void UART_ClearITPendingBit(UART_TypeDef* UARTx, u16 UART_IT) { /* Clear the specified interrupt */ UARTx->ICR &= UART_IT; } /******************************************************************************* * Function Name : UART_IrDALowPowerConfig * Description : Sets the IrDA low power mode * Input : - IrDAx: where x can be 0,1 or 2 to select the UART/IrDA peripheral. * - NewState: new state of the UARTIrDA peripheral. * This parameter can be: ENABLE or DISABLE. * Output : None * Return : None *******************************************************************************/ void UART_IrDALowPowerConfig(u8 IrDAx, FunctionalState NewState) { UART_TypeDef* UARTx; switch(IrDAx) { case IrDA0: UARTx = UART0; break; case IrDA1: UARTx = UART1; break; case IrDA2: UARTx = UART2; break; } if (NewState == ENABLE) { UARTx->CR |= IrDA_LowPower_Enable_Mask; } else { UARTx->CR &= IrDA_LowPower_Disable_Mask; } } /******************************************************************************* * Function Name : UART_IrDASetCounter * Description : Sets the IrDA counter divisor value. * Input : - UARTx: where x can be 0,1 or 2 to select the UART/IrDA peripheral. * - IrDA_Counter: IrDA counter divisor new value n low power mode(Hz). * Output : None * Return : None *******************************************************************************/ void UART_IrDASetCounter(u8 IrDAx, u32 IrDA_Counter) { UART_TypeDef* UARTx; u32 APBClock; switch(IrDAx) { case IrDA0: UARTx = UART0; break; case IrDA1: UARTx = UART1; break; case IrDA2: UARTx = UART2; break; } /* Get the APB frequency */ APBClock = (SCU_GetPCLKFreqValue())*1000; /* Determine the Counter Divisor part */ UARTx->ILPR = (((APBClock*10) / ( IrDA_Counter)) + 5 )/10; } /******************************************************************************* * Function Name : UART_IrDACmd * Description : Enables or disables the UARTxs IrDA interface. * Input : - IrDAx: where x can be 0,1 or 2 to select the UART/IrDA peripheral * - NewState: new state of the UARTx peripheral. * This parameter can be: ENABLE or DISABLE. * Output : None * Return : None *******************************************************************************/ void UART_IrDACmd(u8 IrDAx, FunctionalState NewState) { UART_TypeDef* UARTx; switch(IrDAx) { case IrDA0: UARTx = UART0; break; case IrDA1: UARTx = UART1; break; case IrDA2: UARTx = UART2; break; } if(NewState == ENABLE) { /* Enable the IrDA mode of the specified UART */ UARTx->CR |= UART_IrDA_Enable_Mask; } else { /* Disable the IrDA mode of the specified UART */ UARTx->CR &= UART_IrDA_Disable_Mask; } } /******************************************************************************* * Function Name : UART_SendData * Description : Transmits 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->LCR |= UART_BreakChar_Mask; } /******************************************************************************* * Function Name : UART_RTSConfig * Description : Sets or Resets the RTS signal * Input : - LevelState: new state of the RTS signal for UART0 only. * This parameter can be: LowLevel or HighLevel * Output : None * Return : None *******************************************************************************/ void UART_RTSConfig(UART_LevelTypeDef LevelState) { if(LevelState == LowLevel) { UART0->CR |= UART_RTS_LowLevel_Mask; } else { UART0->CR &= UART_RTS_HighLevel_Mask; } } /******************************************************************************* * Function Name : UART_DTRConfig * Description : Sets or Resets the DTR signal for UART0 only * Input : - LevelState: new state of the DTR signal. * This parameter can be: LowLevel or HighLevel * Output : None * Return : None *******************************************************************************/ void UART_DTRConfig(UART_LevelTypeDef LevelState) { if(LevelState == LowLevel) { UART0->CR |= UART_DTR_LowLevel_Mask; } else { UART0->CR &= UART_DTR_HighLevel_Mask; } } /******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/
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