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A Low_Cost DAPLink Based On CH32X033F8P6
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DAPLink_X033/Code/DAP_X033/Peripheral/src/ch32x035_usart.c

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/********************************** (C) COPYRIGHT *******************************
* File Name : ch32x035_usart.c
* Author : WCH
* Version : V1.0.0
* Date : 2023/04/06
* Description : This file provides all the USART firmware functions.
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************/
#include "ch32x035_usart.h"
#include "ch32x035_rcc.h"
/* USART_Private_Defines */
#define CTLR1_UE_Set ((uint16_t)0x2000) /* USART Enable Mask */
#define CTLR1_UE_Reset ((uint16_t)0xDFFF) /* USART Disable Mask */
#define CTLR1_WAKE_Mask ((uint16_t)0xF7FF) /* USART WakeUp Method Mask */
#define CTLR1_RWU_Set ((uint16_t)0x0002) /* USART mute mode Enable Mask */
#define CTLR1_RWU_Reset ((uint16_t)0xFFFD) /* USART mute mode Enable Mask */
#define CTLR1_SBK_Set ((uint16_t)0x0001) /* USART Break Character send Mask */
#define CTLR1_CLEAR_Mask ((uint16_t)0xE9F3) /* USART CR1 Mask */
#define CTLR2_Address_Mask ((uint16_t)0xFFF0) /* USART address Mask */
#define CTLR2_LINEN_Set ((uint16_t)0x4000) /* USART LIN Enable Mask */
#define CTLR2_LINEN_Reset ((uint16_t)0xBFFF) /* USART LIN Disable Mask */
#define CTLR2_LBDL_Mask ((uint16_t)0xFFDF) /* USART LIN Break detection Mask */
#define CTLR2_STOP_CLEAR_Mask ((uint16_t)0xCFFF) /* USART CR2 STOP Bits Mask */
#define CTLR2_CLOCK_CLEAR_Mask ((uint16_t)0xF0FF) /* USART CR2 Clock Mask */
#define CTLR3_SCEN_Set ((uint16_t)0x0020) /* USART SC Enable Mask */
#define CTLR3_SCEN_Reset ((uint16_t)0xFFDF) /* USART SC Disable Mask */
#define CTLR3_NACK_Set ((uint16_t)0x0010) /* USART SC NACK Enable Mask */
#define CTLR3_NACK_Reset ((uint16_t)0xFFEF) /* USART SC NACK Disable Mask */
#define CTLR3_HDSEL_Set ((uint16_t)0x0008) /* USART Half-Duplex Enable Mask */
#define CTLR3_HDSEL_Reset ((uint16_t)0xFFF7) /* USART Half-Duplex Disable Mask */
#define CTLR3_IRLP_Mask ((uint16_t)0xFFFB) /* USART IrDA LowPower mode Mask */
#define CTLR3_CLEAR_Mask ((uint16_t)0xFCFF) /* USART CR3 Mask */
#define CTLR3_IREN_Set ((uint16_t)0x0002) /* USART IrDA Enable Mask */
#define CTLR3_IREN_Reset ((uint16_t)0xFFFD) /* USART IrDA Disable Mask */
#define GPR_LSB_Mask ((uint16_t)0x00FF) /* Guard Time Register LSB Mask */
#define GPR_MSB_Mask ((uint16_t)0xFF00) /* Guard Time Register MSB Mask */
#define IT_Mask ((uint16_t)0x001F) /* USART Interrupt Mask */
/*********************************************************************
* @fn USART_DeInit
*
* @brief Deinitializes the USARTx peripheral registers to their default
* reset values.
*
* @param USARTx - where x can be 1, 2 , 3 or 4 to select the UART peripheral.
*
* @return none
*/
void USART_DeInit(USART_TypeDef *USARTx)
{
if(USARTx == USART1)
{
RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
}
else if(USARTx == USART2)
{
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
}
else if(USARTx == USART3)
{
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
}
else if(USARTx == USART4)
{
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART4, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART4, DISABLE);
}
}
/*********************************************************************
* @fn USART_Init
*
* @brief Initializes the USARTx peripheral according to the specified
* parameters in the USART_InitStruct.
*
* @param USARTx - where x can be 1, 2 , 3 or 4 to select the UART peripheral.
* USART_InitStruct - pointer to a USART_InitTypeDef structure
* that contains the configuration information for the specified
* USART peripheral.
*
* @return none
*/
void USART_Init(USART_TypeDef *USARTx, USART_InitTypeDef *USART_InitStruct)
{
uint32_t tmpreg = 0x00, apbclock = 0x00;
uint32_t integerdivider = 0x00;
uint32_t fractionaldivider = 0x00;
uint32_t usartxbase = 0;
RCC_ClocksTypeDef RCC_ClocksStatus;
if(USART_InitStruct->USART_HardwareFlowControl != USART_HardwareFlowControl_None)
{
}
usartxbase = (uint32_t)USARTx;
tmpreg = USARTx->CTLR2;
tmpreg &= CTLR2_STOP_CLEAR_Mask;
tmpreg |= (uint32_t)USART_InitStruct->USART_StopBits;
USARTx->CTLR2 = (uint16_t)tmpreg;
tmpreg = USARTx->CTLR1;
tmpreg &= CTLR1_CLEAR_Mask;
tmpreg |= (uint32_t)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |
USART_InitStruct->USART_Mode;
USARTx->CTLR1 = (uint16_t)tmpreg;
tmpreg = USARTx->CTLR3;
tmpreg &= CTLR3_CLEAR_Mask;
tmpreg |= USART_InitStruct->USART_HardwareFlowControl;
USARTx->CTLR3 = (uint16_t)tmpreg;
RCC_GetClocksFreq(&RCC_ClocksStatus);
if(usartxbase == USART1_BASE)
{
apbclock = RCC_ClocksStatus.PCLK2_Frequency;
}
else
{
apbclock = RCC_ClocksStatus.PCLK1_Frequency;
}
integerdivider = ((25 * apbclock) / (4 * (USART_InitStruct->USART_BaudRate)));
tmpreg = (integerdivider / 100) << 4;
fractionaldivider = integerdivider - (100 * (tmpreg >> 4));
tmpreg |= ((((fractionaldivider * 16) + 50) / 100)) & ((uint8_t)0x0F);
USARTx->BRR = (uint16_t)tmpreg;
}
/*********************************************************************
* @fn USART_StructInit
*
* @brief Fills each USART_InitStruct member with its default value.
*
* @param USART_InitStruct: pointer to a USART_InitTypeDef structure
* which will be initialized.
*
* @return none
*/
void USART_StructInit(USART_InitTypeDef *USART_InitStruct)
{
USART_InitStruct->USART_BaudRate = 9600;
USART_InitStruct->USART_WordLength = USART_WordLength_8b;
USART_InitStruct->USART_StopBits = USART_StopBits_1;
USART_InitStruct->USART_Parity = USART_Parity_No;
USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None;
}
/*********************************************************************
* @fn USART_ClockInit
*
* @brief Initializes the USARTx peripheral Clock according to the
* specified parameters in the USART_ClockInitStruct .
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_ClockInitStruct - pointer to a USART_ClockInitTypeDef
* structure that contains the configuration information for the specified
* USART peripheral.
*
* @return none
*/
void USART_ClockInit(USART_TypeDef *USARTx, USART_ClockInitTypeDef *USART_ClockInitStruct)
{
uint32_t tmpreg = 0x00;
tmpreg = USARTx->CTLR2;
tmpreg &= CTLR2_CLOCK_CLEAR_Mask;
tmpreg |= (uint32_t)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL |
USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit;
USARTx->CTLR2 = (uint16_t)tmpreg;
}
/*********************************************************************
* @fn USART_ClockStructInit
*
* @brief Fills each USART_ClockStructInit member with its default value.
*
* @param USART_ClockInitStruct - pointer to a USART_ClockInitTypeDef
* structure which will be initialized.
*
* @return none
*/
void USART_ClockStructInit(USART_ClockInitTypeDef *USART_ClockInitStruct)
{
USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;
USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;
USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;
USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;
}
/*********************************************************************
* @fn USART_Cmd
*
* @brief Enables or disables the specified USART peripheral.
* reset values (Affects also the I2Ss).
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* NewState: ENABLE or DISABLE.
*
* @return none
*/
void USART_Cmd(USART_TypeDef *USARTx, FunctionalState NewState)
{
if(NewState != DISABLE)
{
USARTx->CTLR1 |= CTLR1_UE_Set;
}
else
{
USARTx->CTLR1 &= CTLR1_UE_Reset;
}
}
/*********************************************************************
* @fn USART_ITConfig
*
* @brief Enables or disables the specified USART interrupts.
* reset values (Affects also the I2Ss).
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_IT - specifies the USART interrupt sources to be enabled or disabled.
* USART_IT_LBD - LIN Break detection interrupt.
* USART_IT_TXE - Transmit Data Register empty interrupt.
* USART_IT_TC - Transmission complete interrupt.
* USART_IT_RXNE - Receive Data register not empty interrupt.
* USART_IT_IDLE - Idle line detection interrupt.
* USART_IT_PE - Parity Error interrupt.
* USART_IT_ERR - Error interrupt.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void USART_ITConfig(USART_TypeDef *USARTx, uint16_t USART_IT, FunctionalState NewState)
{
uint32_t usartreg = 0x00, itpos = 0x00, itmask = 0x00;
uint32_t usartxbase = 0x00;
usartxbase = (uint32_t)USARTx;
usartreg = (((uint8_t)USART_IT) >> 0x05);
itpos = USART_IT & IT_Mask;
itmask = (((uint32_t)0x01) << itpos);
if(usartreg == 0x01)
{
usartxbase += 0x0C;
}
else if(usartreg == 0x02)
{
usartxbase += 0x10;
}
else
{
usartxbase += 0x14;
}
if(NewState != DISABLE)
{
*(__IO uint32_t *)usartxbase |= itmask;
}
else
{
*(__IO uint32_t *)usartxbase &= ~itmask;
}
}
/*********************************************************************
* @fn USART_DMACmd
*
* @brief Enables or disables the USART DMA interface.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_DMAReq - specifies the DMA request.
* USART_DMAReq_Tx - USART DMA transmit request.
* USART_DMAReq_Rx - USART DMA receive request.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void USART_DMACmd(USART_TypeDef *USARTx, uint16_t USART_DMAReq, FunctionalState NewState)
{
if(NewState != DISABLE)
{
USARTx->CTLR3 |= USART_DMAReq;
}
else
{
USARTx->CTLR3 &= (uint16_t)~USART_DMAReq;
}
}
/*********************************************************************
* @fn USART_SetAddress
*
* @brief Sets the address of the USART node.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_Address - Indicates the address of the USART node.
*
* @return none
*/
void USART_SetAddress(USART_TypeDef *USARTx, uint8_t USART_Address)
{
USARTx->CTLR2 &= CTLR2_Address_Mask;
USARTx->CTLR2 |= USART_Address;
}
/*********************************************************************
* @fn USART_WakeUpConfig
*
* @brief Selects the USART WakeUp method.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_WakeUp - specifies the USART wakeup method.
* USART_WakeUp_IdleLine - WakeUp by an idle line detection.
* USART_WakeUp_AddressMark - WakeUp by an address mark.
*
* @return none
*/
void USART_WakeUpConfig(USART_TypeDef *USARTx, uint16_t USART_WakeUp)
{
USARTx->CTLR1 &= CTLR1_WAKE_Mask;
USARTx->CTLR1 |= USART_WakeUp;
}
/*********************************************************************
* @fn USART_ReceiverWakeUpCmd
*
* @brief Determines if the USART is in mute mode or not.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void USART_ReceiverWakeUpCmd(USART_TypeDef *USARTx, FunctionalState NewState)
{
if(NewState != DISABLE)
{
USARTx->CTLR1 |= CTLR1_RWU_Set;
}
else
{
USARTx->CTLR1 &= CTLR1_RWU_Reset;
}
}
/*********************************************************************
* @fn USART_LINBreakDetectLengthConfig
*
* @brief Sets the USART LIN Break detection length.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_LINBreakDetectLength - specifies the LIN break detection length.
* USART_LINBreakDetectLength_10b - 10-bit break detection.
* USART_LINBreakDetectLength_11b - 11-bit break detection.
*
* @return none
*/
void USART_LINBreakDetectLengthConfig(USART_TypeDef *USARTx, uint16_t USART_LINBreakDetectLength)
{
USARTx->CTLR2 &= CTLR2_LBDL_Mask;
USARTx->CTLR2 |= USART_LINBreakDetectLength;
}
/*********************************************************************
* @fn USART_LINCmd
*
* @brief Enables or disables the USART LIN mode.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void USART_LINCmd(USART_TypeDef *USARTx, FunctionalState NewState)
{
if(NewState != DISABLE)
{
USARTx->CTLR2 |= CTLR2_LINEN_Set;
}
else
{
USARTx->CTLR2 &= CTLR2_LINEN_Reset;
}
}
/*********************************************************************
* @fn USART_SendData
*
* @brief Transmits single data through the USARTx peripheral.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* Data - the data to transmit.
*
* @return none
*/
void USART_SendData(USART_TypeDef *USARTx, uint16_t Data)
{
USARTx->DATAR = (Data & (uint16_t)0x01FF);
}
/*********************************************************************
* @fn USART_ReceiveData
*
* @brief Returns the most recent received data by the USARTx peripheral.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
*
* @return The received data.
*/
uint16_t USART_ReceiveData(USART_TypeDef *USARTx)
{
return (uint16_t)(USARTx->DATAR & (uint16_t)0x01FF);
}
/*********************************************************************
* @fn USART_SendBreak
*
* @brief Transmits break characters.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
*
* @return none
*/
void USART_SendBreak(USART_TypeDef *USARTx)
{
USARTx->CTLR1 |= CTLR1_SBK_Set;
}
/*********************************************************************
* @fn USART_SetGuardTime
*
* @brief Sets the specified USART guard time.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_GuardTime - specifies the guard time.
*
* @return none
*/
void USART_SetGuardTime(USART_TypeDef *USARTx, uint8_t USART_GuardTime)
{
USARTx->GPR &= GPR_LSB_Mask;
USARTx->GPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08);
}
/*********************************************************************
* @fn USART_SetPrescaler
*
* @brief Sets the system clock prescaler.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_Prescaler - specifies the prescaler clock.
*
* @return none
*/
void USART_SetPrescaler(USART_TypeDef *USARTx, uint8_t USART_Prescaler)
{
USARTx->GPR &= GPR_MSB_Mask;
USARTx->GPR |= USART_Prescaler;
}
/*********************************************************************
* @fn USART_SmartCardCmd
*
* @brief Enables or disables the USART Smart Card mode.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void USART_SmartCardCmd(USART_TypeDef *USARTx, FunctionalState NewState)
{
if(NewState != DISABLE)
{
USARTx->CTLR3 |= CTLR3_SCEN_Set;
}
else
{
USARTx->CTLR3 &= CTLR3_SCEN_Reset;
}
}
/*********************************************************************
* @fn USART_SmartCardNACKCmd
*
* @brief Enables or disables NACK transmission.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void USART_SmartCardNACKCmd(USART_TypeDef *USARTx, FunctionalState NewState)
{
if(NewState != DISABLE)
{
USARTx->CTLR3 |= CTLR3_NACK_Set;
}
else
{
USARTx->CTLR3 &= CTLR3_NACK_Reset;
}
}
/*********************************************************************
* @fn USART_HalfDuplexCmd
*
* @brief Enables or disables the USART Half Duplex communication.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void USART_HalfDuplexCmd(USART_TypeDef *USARTx, FunctionalState NewState)
{
if(NewState != DISABLE)
{
USARTx->CTLR3 |= CTLR3_HDSEL_Set;
}
else
{
USARTx->CTLR3 &= CTLR3_HDSEL_Reset;
}
}
/*********************************************************************
* @fn USART_IrDAConfig
*
* @brief Configures the USART's IrDA interface.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_IrDAMode - specifies the IrDA mode.
* USART_IrDAMode_LowPower.
* USART_IrDAMode_Normal.
*
* @return none
*/
void USART_IrDAConfig(USART_TypeDef *USARTx, uint16_t USART_IrDAMode)
{
USARTx->CTLR3 &= CTLR3_IRLP_Mask;
USARTx->CTLR3 |= USART_IrDAMode;
}
/*********************************************************************
* @fn USART_IrDACmd
*
* @brief Enables or disables the USART's IrDA interface.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* NewState - ENABLE or DISABLE.
*
* @return none
*/
void USART_IrDACmd(USART_TypeDef *USARTx, FunctionalState NewState)
{
if(NewState != DISABLE)
{
USARTx->CTLR3 |= CTLR3_IREN_Set;
}
else
{
USARTx->CTLR3 &= CTLR3_IREN_Reset;
}
}
/*********************************************************************
* @fn USART_GetFlagStatus
*
* @brief Checks whether the specified USART flag is set or not.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_FLAG - specifies the flag to check.
* USART_FLAG_LBD - LIN Break detection flag.
* USART_FLAG_TXE - Transmit data register empty flag.
* USART_FLAG_TC - Transmission Complete flag.
* USART_FLAG_RXNE - Receive data register not empty flag.
* USART_FLAG_IDLE - Idle Line detection flag.
* USART_FLAG_ORE - OverRun Error flag.
* USART_FLAG_NE - Noise Error flag.
* USART_FLAG_FE - Framing Error flag.
* USART_FLAG_PE - Parity Error flag.
*
* @return bitstatus: SET or RESET
*/
FlagStatus USART_GetFlagStatus(USART_TypeDef *USARTx, uint16_t USART_FLAG)
{
FlagStatus bitstatus = RESET;
if((USARTx->STATR & USART_FLAG) != (uint16_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*********************************************************************
* @fn USART_ClearFlag
*
* @brief Clears the USARTx's pending flags.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_FLAG - specifies the flag to clear.
* USART_FLAG_LBD - LIN Break detection flag.
* USART_FLAG_TC - Transmission Complete flag.
* USART_FLAG_RXNE - Receive data register not empty flag.
* Note-
* - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun
* error) and IDLE (Idle line detected) flags are cleared by software
* sequence: a read operation to USART_STATR register (USART_GetFlagStatus())
* followed by a read operation to USART_DATAR register (USART_ReceiveData()).
* - RXNE flag can be also cleared by a read to the USART_DATAR register
* (USART_ReceiveData()).
* - TC flag can be also cleared by software sequence: a read operation to
* USART_STATR register (USART_GetFlagStatus()) followed by a write operation
* to USART_DATAR register (USART_SendData()).
* - TXE flag is cleared only by a write to the USART_DATAR register
* (USART_SendData()).
* @return none
*/
void USART_ClearFlag(USART_TypeDef *USARTx, uint16_t USART_FLAG)
{
USARTx->STATR = (uint16_t)~USART_FLAG;
}
/*********************************************************************
* @fn USART_GetITStatus
*
* @brief Checks whether the specified USART interrupt has occurred or not.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_IT - specifies the USART interrupt source to check.
* USART_IT_LBD - LIN Break detection interrupt.
* USART_IT_TXE - Tansmit Data Register empty interrupt.
* USART_IT_TC - Transmission complete interrupt.
* USART_IT_RXNE - Receive Data register not empty interrupt.
* USART_IT_IDLE - Idle line detection interrupt.
* USART_IT_ORE_RX - OverRun Error interrupt if the RXNEIE bit is set.
* USART_IT_ORE_ER - OverRun Error interrupt if the EIE bit is set.
* USART_IT_NE - Noise Error interrupt.
* USART_IT_FE - Framing Error interrupt.
* USART_IT_PE - Parity Error interrupt.
*
* @return bitstatus: SET or RESET.
*/
ITStatus USART_GetITStatus(USART_TypeDef *USARTx, uint16_t USART_IT)
{
uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00;
ITStatus bitstatus = RESET;
usartreg = (((uint8_t)USART_IT) >> 0x05);
itmask = USART_IT & IT_Mask;
itmask = (uint32_t)0x01 << itmask;
if(usartreg == 0x01)
{
itmask &= USARTx->CTLR1;
}
else if(usartreg == 0x02)
{
itmask &= USARTx->CTLR2;
}
else
{
itmask &= USARTx->CTLR3;
}
bitpos = USART_IT >> 0x08;
bitpos = (uint32_t)0x01 << bitpos;
bitpos &= USARTx->STATR;
if((itmask != (uint16_t)RESET) && (bitpos != (uint16_t)RESET))
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*********************************************************************
* @fn USART_ClearITPendingBit
*
* @brief Clears the USARTx's interrupt pending bits.
*
* @param USARTx - where x can be 1, 2, 3 or 4 to select the USART peripheral.
* USART_IT - specifies the interrupt pending bit to clear.
* USART_IT_LBD - LIN Break detection interrupt.
* USART_IT_TC - Transmission complete interrupt.
* USART_IT_RXNE - Receive Data register not empty interrupt.
* Note-
* - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun
* error) and IDLE (Idle line detected) pending bits are cleared by
* software sequence: a read operation to USART_STATR register
* (USART_GetITStatus()) followed by a read operation to USART_DATAR register
* (USART_ReceiveData()).
* - RXNE pending bit can be also cleared by a read to the USART_DATAR register
* (USART_ReceiveData()).
* - TC pending bit can be also cleared by software sequence: a read
* operation to USART_STATR register (USART_GetITStatus()) followed by a write
* operation to USART_DATAR register (USART_SendData()).
* - TXE pending bit is cleared only by a write to the USART_DATAR register
* (USART_SendData()).
* @return none
*/
void USART_ClearITPendingBit(USART_TypeDef *USARTx, uint16_t USART_IT)
{
uint16_t bitpos = 0x00, itmask = 0x00;
bitpos = USART_IT >> 0x08;
itmask = ((uint16_t)0x01 << (uint16_t)bitpos);
USARTx->STATR = (uint16_t)~itmask;
}