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5778a37513
| Author | SHA1 | Date |
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 gnssuser
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5778a37513 | 3 weeks ago |
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gnssuser
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172ed5e2be | 3 weeks ago |
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gnssuser
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3ec1750053 | 3 weeks ago |
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gnssuser
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320688d525 | 3 weeks ago |
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gnssuser
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9fcaab1916 | 3 weeks ago |
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gnssuser
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9847d1115a | 3 weeks ago |
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gnssuser
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927ea196bb | 3 weeks ago |
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/***************************************************************************//**
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* @file usart1_it.c
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* @brief UART with interrupt and ring buffer (USART1)
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*//****************************************************************************/
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#include "stm32f4xx_hal.h"
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//------------------------------C library---------------------------------------
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#include <stdlib.h>
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//----------------------------user includes-------------------------------------
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#include "usart1_it.h"
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#include "usart1_it_cfg.h"
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//------------------------------------------------------------------------------
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/* Private typedefs ----------------------------------------------------------*/
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/* Private macros ------------------------------------------------------------*/
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//====== UART buffer defines ===================================================
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#define USART1_RXBUF_MASK (USART1_RXBUF_SIZE - 1)
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#define USART1_TXBUF_MASK (USART1_TXBUF_SIZE - 1)
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#if ( USART1_RXBUF_SIZE & USART1_RXBUF_MASK )
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#error RX buffer size is not a power of 2!
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#endif
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#if ( USART1_TXBUF_SIZE & USART1_TXBUF_MASK )
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#error TX buffer size is not a power of 2!
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#endif
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/* Private variables ---------------------------------------------------------*/
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//====== Variables for transmitter =============================================
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static uint8_t Usart1TxBuf[USART1_TXBUF_SIZE];
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static uint16_t Usart1TxWrIdx = 0;
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static volatile uint16_t Usart1TxRdIdx = 0;
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//====== Variables for Receiver ================================================
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static uint8_t Usart1RxBuf[USART1_RXBUF_SIZE];
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static volatile uint16_t Usart1RxWrIdx = 0;
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static volatile uint16_t Usart1RxRdIdx = 0;
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/* Public variables ----------------------------------------------------------*/
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/* Functions -----------------------------------------------------------------*/
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/***************************************************************************//**
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* @brief USART1 init
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*//****************************************************************************/
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void Usart1_Init(void) {
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USART1->CR1 |= USART_CR1_RXNEIE; // Enable RX interrupt
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}
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/***************************************************************************//**
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* @brief USART1 interrupt handler
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*//****************************************************************************/
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void USART1_IRQHandler(void) {
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uint32_t statusreg = USART1->SR; // read interrupt flags
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if ((statusreg & USART_SR_RXNE)) { // RX interrupt
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uint8_t d = USART1->DR; // read received byte
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uint_fast16_t wr = Usart1RxWrIdx;
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wr = (wr + 1) & USART1_RXBUF_MASK; // new write index
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Usart1RxBuf[wr] = d; // received data to buffer
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Usart1RxWrIdx = wr; // Store new index
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}
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if ((statusreg & USART_SR_TXE)) { // TX interrupt
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uint_fast16_t rd = Usart1TxRdIdx;
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uint_fast16_t wr = Usart1TxWrIdx;
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if (wr != rd) { // data in buffer
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rd = (rd + 1) & USART1_TXBUF_MASK; // new read index
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USART1->DR = Usart1TxBuf[rd]; // send data byte
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Usart1TxRdIdx = rd; // Store new index
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}
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if (wr == rd) { // data buffer empty
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USART1->CR1 &= ~USART_CR1_TXEIE; // INT disable
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}
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}
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}
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/***************************************************************************//**
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* @brief Send byte to UART
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* @param d: byte to send
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*//****************************************************************************/
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void Usart1_PutByte(uint8_t d) {
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uint_fast16_t wr = Usart1TxWrIdx;
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wr = (wr + 1) & USART1_TXBUF_MASK; // new write index
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if (wr == Usart1TxRdIdx) { // No free space in buffer (overflow)
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return; // drop remaining data (Attention! Buffer overflow not signaled! Use bigger buffer)
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}
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Usart1TxBuf[wr] = d; // Store data in buffer
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Usart1TxWrIdx = wr; // Store new index
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USART1->CR1 |= USART_CR1_TXEIE; // Interrupt enable (start send)
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}
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/***************************************************************************//**
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* @brief Send more data to UART
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* @param src: data to send
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* @param n: count of data
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*//****************************************************************************/
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void Usart1_PutData (void* src, uint16_t n) {
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uint8_t* p = src;
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uint_fast16_t wr = Usart1TxWrIdx;
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while (n) {
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wr = (wr + 1) & USART1_TXBUF_MASK; // new write index
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if (wr == Usart1TxRdIdx) { // No free space in buffer (overflow)
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break; // drop remaining data (Attention! Buffer overflow not signaled! Use bigger buffer)
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}
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Usart1TxBuf[wr] = *p; // Store data in buffer
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p++;
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n--;
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}
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Usart1TxWrIdx = wr; // Store new index
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USART1->CR1 |= USART_CR1_TXEIE; // Interrupt enable (start send)
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}
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/***************************************************************************//**
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* @brief Read data from UART RX buffer
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* @return received character, -1: no data in RX buffer
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*//****************************************************************************/
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int16_t Usart1_GetByte(void) {
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uint_fast16_t rd = Usart1RxRdIdx;
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if (rd != Usart1RxWrIdx) { // new data in buffer
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rd = (rd + 1) & USART1_RXBUF_MASK; // new read index
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Usart1RxRdIdx = rd; // store new index
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return Usart1RxBuf[rd]; // return with data
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}else {
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return -1; // buffer empty
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}
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}
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@ -0,0 +1,13 @@
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// filepath: c:\projects\STM32CubeIDE\GNSS_Nucleo\Core\user\usart1_it.h
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#ifndef __USART1_IT_H__
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#define __USART1_IT_H__
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#include <stdint.h>
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extern void Usart1_Init(void);
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extern void Usart1_PutByte(uint8_t d);
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extern void Usart1_PutData(void* src, uint16_t n);
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extern int16_t Usart1_GetByte(void);
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#endif
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// filepath: c:\projects\STM32CubeIDE\GNSS_Nucleo\Core\user\usart1_it_cfg.h
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#ifndef __USART1_IT_CFG_H__
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#define __USART1_IT_CFG_H__
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#define USART1_RXBUF_SIZE 1024
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#define USART1_TXBUF_SIZE 1024
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#endif // __USART1_IT_CFG_H__
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