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FreeRTOS-Kernel/Demo/ARM9_STR91X_IAR/Library/source/91x_uart.c
Richard Barry 3dcbed5763 Update to V4.0.4. Add in STR912 port and demo.
2006-06-22 17:18:31 +00:00

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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 UARTx’s 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 UARTx’s 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 UARTx’s 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 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_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 UARTx’s 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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