#include "stm32f407xx_usart_driver.
h"
/*********************************************************************
* @fn - USART_SetBaudRate
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
void USART_SetBaudRate(USART_RegDef_t *pUSARTx, uint32_t BaudRate)
{
//Variable to hold the APB clock
uint32_t PCLKx;
uint32_t usartdiv;
//variables to hold Mantissa and Fraction values
uint32_t M_part,F_part;
uint32_t tempreg=0;
//Get the value of APB bus clock in to the variable PCLKx
if(pUSARTx == USART1 || pUSARTx == USART6)
{
//USART1 and USART6 are hanging on APB2 bus
PCLKx = RCC_GetPCLK2Value();
}else
{
PCLKx = RCC_GetPCLK1Value();
}
//Check for OVER8 configuration bit
if(pUSARTx->CR1 & (1 << USART_CR1_OVER8))
{
//OVER8 = 1 , over sampling by 8
usartdiv = ((25 * PCLKx) / (2 *BaudRate));
}else
{
//over sampling by 16
usartdiv = ((25 * PCLKx) / (4 *BaudRate));
}
//Calculate the Mantissa part
M_part = usartdiv/100;
//Place the Mantissa part in appropriate bit position . refer USART_BRR
tempreg |= M_part << 4;
//Extract the fraction part
F_part = (usartdiv - (M_part * 100));
//Calculate the final fractional
if(pUSARTx->CR1 & ( 1 << USART_CR1_OVER8))
{
//OVER8 = 1 , over sampling by 8
F_part = ((( F_part * 8)+ 50) / 100)& ((uint8_t)0x07);
}else
{
//over sampling by 16
F_part = ((( F_part * 16)+ 50) / 100) & ((uint8_t)0x0F);
}
//Place the fractional part in appropriate bit position . refer
USART_BRR
tempreg |= F_part;
//copy the value of tempreg in to BRR register
pUSARTx->BRR = tempreg;
}
/*********************************************************************
* @fn - USART_Init
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
void USART_Init(USART_Handle_t *pUSARTHandle)
{
//Temporary variable
uint32_t tempreg=0;
/******************************** Configuration of
CR1******************************************/
//Implement the code to enable the Clock for given USART peripheral
USART_PeriClockControl(pUSARTHandle->pUSARTx,ENABLE);
//Enable USART Tx and Rx engines according to the USART_Mode
configuration item
if ( pUSARTHandle->USART_Config.USART_Mode == USART_MODE_ONLY_RX)
{
//Implement the code to enable the Receiver bit field
tempreg|= (1 << USART_CR1_RE);
}else if (pUSARTHandle->USART_Config.USART_Mode ==
USART_MODE_ONLY_TX)
{
//Implement the code to enable the Transmitter bit field
tempreg |= ( 1 << USART_CR1_TE );
}else if (pUSARTHandle->USART_Config.USART_Mode == USART_MODE_TXRX)
{
//Implement the code to enable the both Transmitter and
Receiver bit fields
tempreg |= ( ( 1 << USART_CR1_RE) | ( 1 << USART_CR1_TE) );
}
//Implement the code to configure the Word length configuration item
tempreg |= pUSARTHandle->USART_Config.USART_WordLength <<
USART_CR1_M ;
//Configuration of parity control bit fields
if ( pUSARTHandle->USART_Config.USART_ParityControl ==
USART_PARITY_EN_EVEN)
{
//Implement the code to enable the parity control
tempreg |= ( 1 << USART_CR1_PCE);
//Implement the code to enable EVEN parity
//Not required because by default EVEN parity will be
selected once you enable the parity control
}else if (pUSARTHandle->USART_Config.USART_ParityControl ==
USART_PARITY_EN_ODD )
{
//Implement the code to enable the parity control
tempreg |= ( 1 << USART_CR1_PCE);
//Implement the code to enable ODD parity
tempreg |= ( 1 << USART_CR1_PS);
}
//Program the CR1 register
pUSARTHandle->pUSARTx->CR1 = tempreg;
/******************************** Configuration of
CR2******************************************/
tempreg=0;
//Implement the code to configure the number of stop bits inserted
during USART frame transmission
tempreg |= pUSARTHandle->USART_Config.USART_NoOfStopBits <<
USART_CR2_STOP;
//Program the CR2 register
pUSARTHandle->pUSARTx->CR2 = tempreg;
/******************************** Configuration of
CR3******************************************/
tempreg=0;
//Configuration of USART hardware flow control
if ( pUSARTHandle->USART_Config.USART_HWFlowControl ==
USART_HW_FLOW_CTRL_CTS)
{
//Implement the code to enable CTS flow control
tempreg |= ( 1 << USART_CR3_CTSE);
}else if (pUSARTHandle->USART_Config.USART_HWFlowControl ==
USART_HW_FLOW_CTRL_RTS)
{
//Implement the code to enable RTS flow control
tempreg |= ( 1 << USART_CR3_RTSE);
}else if (pUSARTHandle->USART_Config.USART_HWFlowControl ==
USART_HW_FLOW_CTRL_CTS_RTS)
{
//Implement the code to enable both CTS and RTS Flow control
tempreg |= ( 1 << USART_CR3_CTSE);
tempreg |= ( 1 << USART_CR3_RTSE);
}
pUSARTHandle->pUSARTx->CR3 = tempreg;
/******************************** Configuration of BRR(Baudrate
register)******************************************/
//Implement the code to configure the baud rate
//We will cover this in the lecture. No action required here
USART_SetBaudRate(pUSARTHandle->pUSARTx,pUSARTHandle-
>USART_Config.USART_Baud);
}
/*********************************************************************
* @fn - USART_EnableOrDisable
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
void USART_PeripheralControl(USART_RegDef_t *pUSARTx, uint8_t Cmd)
{
if(Cmd == ENABLE)
{
pUSARTx->CR1 |= (1 << 13);
}else
{
pUSARTx->CR1 &= ~(1 << 13);
}
}
/*********************************************************************
* @fn - I2C_PeriClockControl
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
void USART_PeriClockControl(USART_RegDef_t *pUSARTx, uint8_t EnorDi)
{
if(EnorDi == ENABLE)
{
if(pUSARTx == USART1)
{
USART1_PCCK_EN();
}else if (pUSARTx == USART2)
{
USART2_PCCK_EN();
}else if (pUSARTx == USART3)
{
USART3_PCCK_EN();
}
else if (pUSARTx == UART4)
{
UART4_PCCK_EN();
}
}
else
{
//TODO
}
}
/*********************************************************************
* @fn - USART_GetFlagStatus
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
uint8_t USART_GetFlagStatus(USART_RegDef_t *pUSARTx, uint8_t
StatusFlagName)
{
if(pUSARTx->SR & StatusFlagName)
{
return SET;
}
return RESET;
}
/*********************************************************************
* @fn - USART_SendData
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note - Resolve all the TODOs
*/
void USART_SendData(USART_Handle_t *pUSARTHandle, uint8_t *pTxBuffer,
uint32_t Len)
{
uint16_t *pdata;
//Loop over until "Len" number of bytes are transferred
for(uint32_t i = 0 ; i < Len; i++)
{
//Implement the code to wait until TXE flag is set in the SR
while(! USART_GetFlagStatus(pUSARTHandle-
>pUSARTx,USART_FLAG_TXE));
//Check the USART_WordLength item for 9BIT or 8BIT in a frame
if(pUSARTHandle->USART_Config.USART_WordLength ==
USART_WORDLEN_9BITS)
{
//if 9BIT load the DR with 2bytes masking the bits
other than first 9 bits
pdata = (uint16_t*) pTxBuffer;
pUSARTHandle->pUSARTx->DR = (*pdata & (uint16_t)0x01FF);
//check for USART_ParityControl
if(pUSARTHandle->USART_Config.USART_ParityControl ==
USART_PARITY_DISABLE)
{
//No parity is used in this transfer , so 9bits of
user data will be sent
//Implement the code to increment pTxBuffer twice
pTxBuffer++;
pTxBuffer++;
}
else
{
//Parity bit is used in this transfer . so 8bits
of user data will be sent
//The 9th bit will be replaced by parity bit by
the hardware
pTxBuffer++;
}
}
else
{
//This is 8bit data transfer
pUSARTHandle->pUSARTx->DR = (*pTxBuffer &
(uint8_t)0xFF);
//Implement the code to increment the buffer address
pTxBuffer++;
}
}
//Implement the code to wait till TC flag is set in the SR
while( ! USART_GetFlagStatus(pUSARTHandle->pUSARTx,USART_FLAG_TC));
}
/*********************************************************************
* @fn - USART_ReceiveData
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
void USART_ReceiveData(USART_Handle_t *pUSARTHandle, uint8_t *pRxBuffer,
uint32_t Len)
{
//Loop over until "Len" number of bytes are transferred
for(uint32_t i = 0 ; i < Len; i++)
{
//Implement the code to wait until RXNE flag is set in the SR
while(! USART_GetFlagStatus(pUSARTHandle-
>pUSARTx,USART_FLAG_RXNE));
//Check the USART_WordLength to decide whether we are going
to receive 9bit of data in a frame or 8 bit
if(pUSARTHandle->USART_Config.USART_WordLength ==
USART_WORDLEN_9BITS)
{
//We are going to receive 9bit data in a frame
//Now, check are we using USART_ParityControl control or
not
if(pUSARTHandle->USART_Config.USART_ParityControl ==
USART_PARITY_DISABLE)
{
//No parity is used , so all 9bits will be of user
data
//read only first 9 bits so mask the DR with
0x01FF
*((uint16_t*) pRxBuffer) = (pUSARTHandle->pUSARTx-
>DR & (uint16_t)0x01FF);
//Now increment the pRxBuffer two times
pRxBuffer++;
pRxBuffer++;
}
else
{
//Parity is used, so 8bits will be of user data
and 1 bit is parity
*pRxBuffer = (pUSARTHandle->pUSARTx->DR &
(uint8_t)0xFF);
pRxBuffer++;
}
}
else
{
//We are going to receive 8bit data in a frame
//Now, check are we using USART_ParityControl control or
not
if(pUSARTHandle->USART_Config.USART_ParityControl ==
USART_PARITY_DISABLE)
{
//No parity is used , so all 8bits will be of user
data
//read 8 bits from DR
*pRxBuffer = (uint8_t) (pUSARTHandle->pUSARTx->DR
& (uint8_t)0xFF);
}
else
{
//Parity is used, so , 7 bits will be of user data
and 1 bit is parity
//read only 7 bits , hence mask the DR with 0X7F
*pRxBuffer = (uint8_t) (pUSARTHandle->pUSARTx->DR
& (uint8_t)0x7F);
}
//Now , increment the pRxBuffer
pRxBuffer++;
}
}
}
/*********************************************************************
* @fn - USART_SendDataWithIT
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
uint8_t USART_SendDataIT(USART_Handle_t *pUSARTHandle,uint8_t *pTxBuffer,
uint32_t Len)
{
uint8_t txstate = pUSARTHandle->TxBusyState;
if(txstate != USART_BUSY_IN_TX)
{
pUSARTHandle->TxLen = Len;
pUSARTHandle->pTxBuffer = pTxBuffer;
pUSARTHandle->TxBusyState = USART_BUSY_IN_TX;
//Implement the code to enable interrupt for TXE
pUSARTHandle->pUSARTx->CR1 |= ( 1 << USART_CR1_TXEIE);
//Implement the code to enable interrupt for TC
pUSARTHandle->pUSARTx->CR1 |= ( 1 << USART_CR1_TCIE);
}
return txstate;
}
/*********************************************************************
* @fn - USART_ReceiveDataWithIT
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
uint8_t USART_ReceiveDataIT(USART_Handle_t *pUSARTHandle,uint8_t
*pRxBuffer, uint32_t Len)
{
uint8_t rxstate = pUSARTHandle->RxBusyState;
if(rxstate != USART_BUSY_IN_RX)
{
pUSARTHandle->RxLen = Len;
pUSARTHandle->pRxBuffer = pRxBuffer;
pUSARTHandle->RxBusyState = USART_BUSY_IN_RX;
(void)pUSARTHandle->pUSARTx->DR;
//Implement the code to enable interrupt for RXNE
pUSARTHandle->pUSARTx->CR1 |= ( 1 << USART_CR1_RXNEIE);
}
return rxstate;
}
/*********************************************************************
* @fn - USART_ClearFlag
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note - Applicable to only USART_CTS_FLAG ,
USART_LBD_FLAG
* USART_TC_FLAG,USART_TC_FLAG flags
*
*/
void USART_ClearFlag(USART_RegDef_t *pUSARTx, uint16_t StatusFlagName)
{
pUSARTx->SR &= ~( StatusFlagName);
}
/*********************************************************************
* @fn - USART_IRQInterruptConfig
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
void USART_IRQInterruptConfig(uint8_t IRQNumber, uint8_t EnorDi)
{
if(EnorDi == ENABLE)
{
if(IRQNumber <= 31)
{
//program ISER0 register
*NVIC_ISER0 |= ( 1 << IRQNumber );
}else if(IRQNumber > 31 && IRQNumber < 64 ) //32 to 63
{
//program ISER1 register
*NVIC_ISER1 |= ( 1 << (IRQNumber % 32) );
}
else if(IRQNumber >= 64 && IRQNumber < 96 )
{
//program ISER2 register //64 to 95
*NVIC_ISER3 |= ( 1 << (IRQNumber % 64) );
}
}else
{
if(IRQNumber <= 31)
{
//program ICER0 register
*NVIC_ICER0 |= ( 1 << IRQNumber );
}else if(IRQNumber > 31 && IRQNumber < 64 )
{
//program ICER1 register
*NVIC_ICER1 |= ( 1 << (IRQNumber % 32) );
}
else if(IRQNumber >= 6 && IRQNumber < 96 )
{
//program ICER2 register
*NVIC_ICER3 |= ( 1 << (IRQNumber % 64) );
}
}
}
/*********************************************************************
* @fn - USART_IRQPriorityConfig
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
void USART_IRQPriorityConfig(uint8_t IRQNumber,uint32_t IRQPriority)
{
//1. first lets find out the ipr register
uint8_t iprx = IRQNumber / 4;
uint8_t iprx_section = IRQNumber %4 ;
uint8_t shift_amount = ( 8 * iprx_section) + ( 8 -
NO_PR_BITS_IMPLEMENTED) ;
*( NVIC_PR_BASE_ADDR + iprx ) |= ( IRQPriority << shift_amount );
}
/*********************************************************************
* @fn - USART_IRQHandler
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
void USART_IRQHandling(USART_Handle_t *pUSARTHandle)
{
uint32_t temp1 , temp2, temp3;
uint16_t *pdata;
/*************************Check for TC flag
********************************************/
//Implement the code to check the state of TC bit in the SR
temp1 = pUSARTHandle->pUSARTx->SR & ( 1 << USART_SR_TC);
//Implement the code to check the state of TCEIE bit
temp2 = pUSARTHandle->pUSARTx->CR1 & ( 1 << USART_CR1_TCIE);
if(temp1 && temp2 )
{
//this interrupt is because of TC
//close transmission and call application callback if TxLen
is zero
if ( pUSARTHandle->TxBusyState == USART_BUSY_IN_TX)
{
//Check the TxLen . If it is zero then close the data
transmission
if(! pUSARTHandle->TxLen )
{
//Implement the code to clear the TC flag
pUSARTHandle->pUSARTx->SR &= ~( 1 << USART_SR_TC);
//Implement the code to clear the TCIE control bit
//Reset the application state
pUSARTHandle->TxBusyState = USART_READY;
//Reset Buffer address to NULL
pUSARTHandle->pTxBuffer = NULL;
//Reset the length to zero
pUSARTHandle->TxLen = 0;
//Call the application call back with event
USART_EVENT_TX_CMPLT
USART_ApplicationEventCallback(pUSARTHandle,USART_EVENT_TX_CMPLT);
}
}
}
/*************************Check for TXE flag
********************************************/
//Implement the code to check the state of TXE bit in the SR
temp1 = pUSARTHandle->pUSARTx->SR & ( 1 << USART_SR_TXE);
//Implement the code to check the state of TXEIE bit in CR1
temp2 = pUSARTHandle->pUSARTx->CR1 & ( 1 << USART_CR1_TXEIE);
if(temp1 && temp2 )
{
//this interrupt is because of TXE
if(pUSARTHandle->TxBusyState == USART_BUSY_IN_TX)
{
//Keep sending data until Txlen reaches to zero
if(pUSARTHandle->TxLen > 0)
{
//Check the USART_WordLength item for 9BIT or 8BIT
in a frame
if(pUSARTHandle->USART_Config.USART_WordLength ==
USART_WORDLEN_9BITS)
{
//if 9BIT load the DR with 2bytes masking
the bits other than first 9 bits
pdata = (uint16_t*) pUSARTHandle->pTxBuffer;
pUSARTHandle->pUSARTx->DR = (*pdata &
(uint16_t)0x01FF);
//check for USART_ParityControl
if(pUSARTHandle-
>USART_Config.USART_ParityControl == USART_PARITY_DISABLE)
{
//No parity is used in this transfer ,
so 9bits of user data will be sent
//Implement the code to increment
pTxBuffer twice
pUSARTHandle->pTxBuffer++;
pUSARTHandle->pTxBuffer++;
pUSARTHandle->TxLen-=2;
}
else
{
//Parity bit is used in this transfer .
so 8bits of user data will be sent
//The 9th bit will be replaced by
parity bit by the hardware
pUSARTHandle->pTxBuffer++;
pUSARTHandle->TxLen-=1;
}
}
else
{
//This is 8bit data transfer
pUSARTHandle->pUSARTx->DR = (*pUSARTHandle-
>pTxBuffer & (uint8_t)0xFF);
//Implement the code to increment the buffer
address
pUSARTHandle->pTxBuffer++;
pUSARTHandle->TxLen-=1;
}
}
if (pUSARTHandle->TxLen == 0 )
{
//TxLen is zero
//Implement the code to clear the TXEIE bit
(disable interrupt for TXE flag )
pUSARTHandle->pUSARTx->CR1 &= ~( 1 <<
USART_CR1_TXEIE);
}
}
}
/*************************Check for RXNE flag
********************************************/
temp1 = pUSARTHandle->pUSARTx->SR & ( 1 << USART_SR_RXNE);
temp2 = pUSARTHandle->pUSARTx->CR1 & ( 1 << USART_CR1_RXNEIE);
if(temp1 && temp2 )
{
//this interrupt is because of rxne
if(pUSARTHandle->RxBusyState == USART_BUSY_IN_RX)
{
if(pUSARTHandle->RxLen > 0)
{
//Check the USART_WordLength to decide whether we
are going to receive 9bit of data in a frame or 8 bit
if(pUSARTHandle->USART_Config.USART_WordLength ==
USART_WORDLEN_9BITS)
{
//We are going to receive 9bit data in a
frame
//Now, check are we using
USART_ParityControl control or not
if(pUSARTHandle-
>USART_Config.USART_ParityControl == USART_PARITY_DISABLE)
{
//No parity is used , so all 9bits will
be of user data
//read only first 9 bits so mask the DR
with 0x01FF
*((uint16_t*) pUSARTHandle->pRxBuffer)
= (pUSARTHandle->pUSARTx->DR & (uint16_t)0x01FF);
//Now increment the pRxBuffer two times
pUSARTHandle->pRxBuffer++;
pUSARTHandle->pRxBuffer++;
pUSARTHandle->RxLen-=2;
}
else
{
//Parity is used, so 8bits will be of
user data and 1 bit is parity
*pUSARTHandle->pRxBuffer =
(pUSARTHandle->pUSARTx->DR & (uint8_t)0xFF);
pUSARTHandle->pRxBuffer++;
pUSARTHandle->RxLen-=1;
}
}
else
{
//We are going to receive 8bit data in a
frame
//Now, check are we using
USART_ParityControl control or not
if(pUSARTHandle-
>USART_Config.USART_ParityControl == USART_PARITY_DISABLE)
{
//No parity is used , so all 8bits will
be of user data
//read 8 bits from DR
*pUSARTHandle->pRxBuffer = (uint8_t)
(pUSARTHandle->pUSARTx->DR & (uint8_t)0xFF);
}
else
{
//Parity is used, so , 7 bits will be
of user data and 1 bit is parity
//read only 7 bits , hence mask the DR
with 0X7F
*pUSARTHandle->pRxBuffer = (uint8_t)
(pUSARTHandle->pUSARTx->DR & (uint8_t)0x7F);
}
//Now , increment the pRxBuffer
pUSARTHandle->pRxBuffer++;
pUSARTHandle->RxLen-=1;
}
}//if of >0
if(! pUSARTHandle->RxLen)
{
//disable the rxne
pUSARTHandle->pUSARTx->CR1 &= ~( 1 <<
USART_CR1_RXNEIE );
pUSARTHandle->RxBusyState = USART_READY;
USART_ApplicationEventCallback(pUSARTHandle,USART_EVENT_RX_CMPLT);
}
}
}
/*************************Check for CTS flag
********************************************/
//Note : CTS feature is not applicable for UART4 and UART5
//Implement the code to check the status of CTS bit in the SR
temp1 = pUSARTHandle->pUSARTx->SR & ( 1 << USART_SR_CTS);
//Implement the code to check the state of CTSE bit in CR1
temp2 = pUSARTHandle->pUSARTx->CR3 & ( 1 << USART_CR3_CTSE);
//Implement the code to check the state of CTSIE bit in CR3 (This
bit is not available for UART4 & UART5.)
temp3 = pUSARTHandle->pUSARTx->CR3 & ( 1 << USART_CR3_CTSIE);
if(temp1 && temp2 )
{
//Implement the code to clear the CTS flag in SR
pUSARTHandle->pUSARTx->SR &= ~( 1 << USART_SR_CTS);
//this interrupt is because of cts
USART_ApplicationEventCallback(pUSARTHandle,USART_EVENT_CTS);
}
/*************************Check for IDLE detection flag
********************************************/
//Implement the code to check the status of IDLE flag bit in the SR
temp1 = pUSARTHandle->pUSARTx->SR & ( 1 << USART_SR_IDLE);
//Implement the code to check the state of IDLEIE bit in CR1
temp2 = pUSARTHandle->pUSARTx->CR1 & ( 1 << USART_CR1_IDLEIE);
if(temp1 && temp2)
{
//Implement the code to clear the IDLE flag. Refer to the RM
to understand the clear sequence
temp1 = pUSARTHandle->pUSARTx->SR &= ~( 1 << USART_SR_IDLE);
//this interrupt is because of idle
USART_ApplicationEventCallback(pUSARTHandle,USART_EVENT_IDLE);
}
/*************************Check for Overrun detection flag
********************************************/
//Implement the code to check the status of ORE flag in the SR
temp1 = pUSARTHandle->pUSARTx->SR & USART_SR_ORE;
//Implement the code to check the status of RXNEIE bit in the CR1
temp2 = pUSARTHandle->pUSARTx->CR1 & USART_CR1_RXNEIE;
if(temp1 && temp2 )
{
//Need not to clear the ORE flag here, instead give an api
for the application to clear the ORE flag .
//this interrupt is because of Overrun error
USART_ApplicationEventCallback(pUSARTHandle,USART_ERR_ORE);
}
/*************************Check for Error Flag
********************************************/
//Noise Flag, Overrun error and Framing Error in multibuffer
communication
//We dont discuss multibuffer communication in this course. please refer
to the RM
//The blow code will get executed in only if multibuffer mode is used.
temp2 = pUSARTHandle->pUSARTx->CR3 & ( 1 << USART_CR3_EIE) ;
if(temp2 )
{
temp1 = pUSARTHandle->pUSARTx->SR;
if(temp1 & ( 1 << USART_SR_FE))
{
/*
This bit is set by hardware when a de-
synchronization, excessive noise or a break character
is detected. It is cleared by a software sequence
(an read to the USART_SR register
followed by a read to the USART_DR register).
*/
USART_ApplicationEventCallback(pUSARTHandle,USART_ERR_FE);
}
if(temp1 & ( 1 << USART_SR_NE) )
{
/*
This bit is set by hardware when noise is detected
on a received frame. It is cleared by a
software sequence (an read to the USART_SR
register followed by a read to the
USART_DR register).
*/
USART_ApplicationEventCallback(pUSARTHandle,USART_ERR_NE);
}
if(temp1 & ( 1 << USART_SR_ORE) )
{
USART_ApplicationEventCallback(pUSARTHandle,USART_ERR_ORE);
}
}
}
/*********************************************************************
* @fn - USART_ApplicationEventCallback
*
* @brief -
*
* @param[in] -
* @param[in] -
* @param[in] -
*
* @return -
*
* @Note -
*/
__weak void USART_ApplicationEventCallback(USART_Handle_t
*pUSARTHandle,uint8_t event)
{
}
