You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
140 lines
5.5 KiB
C
140 lines
5.5 KiB
C
/***************************************************************************//**
|
|
* @file uart5_it.c
|
|
* @brief UART with interrupt and ring buffer
|
|
*//****************************************************************************/
|
|
|
|
#include "uart5_it.h"
|
|
|
|
//------------------------------C library---------------------------------------
|
|
#include <stdlib.h>
|
|
//----------------------------user includes-------------------------------------
|
|
#include "uart5_it_cfg.h"
|
|
//------------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
/* Private typedefs ----------------------------------------------------------*/
|
|
|
|
/* Private macros ------------------------------------------------------------*/
|
|
|
|
//====== UART buffer defines ===================================================
|
|
#define UART5_RXBUF_MASK (UART5_RXBUF_SIZE - 1)
|
|
#define UART5_TXBUF_MASK (UART5_TXBUF_SIZE - 1)
|
|
|
|
#if ( UART5_RXBUF_SIZE & UART5_RXBUF_MASK )
|
|
#error RX buffer size is not a power of 2!
|
|
#endif
|
|
|
|
#if ( UART5_TXBUF_SIZE & UART5_TXBUF_MASK )
|
|
#error TX buffer size is not a power of 2!
|
|
#endif
|
|
|
|
|
|
/* Private variables ---------------------------------------------------------*/
|
|
|
|
//====== Variables for transmitter =============================================
|
|
static uint8_t Uart5TxBuf[UART5_TXBUF_SIZE];
|
|
static uint16_t Uart5TxWrIdx = 0;
|
|
static volatile uint16_t Uart5TxRdIdx = 0;
|
|
|
|
//====== Variables for Receiver ================================================
|
|
static uint8_t Uart5RxBuf[UART5_RXBUF_SIZE];
|
|
static volatile uint16_t Uart5RxWrIdx = 0;
|
|
static volatile uint16_t Uart5RxRdIdx = 0;
|
|
|
|
|
|
/* Public variables ----------------------------------------------------------*/
|
|
|
|
|
|
/* Functions -----------------------------------------------------------------*/
|
|
|
|
|
|
/***************************************************************************//**
|
|
* @brief UART5 init
|
|
*//****************************************************************************/
|
|
void Uart5_Init(void) {
|
|
LL_USART_EnableIT_RXNE(UART5); //UART5->CR1 |= UART_CR1_RXNEIE; // Enable RX interrupt
|
|
}
|
|
|
|
|
|
/***************************************************************************//**
|
|
* @brief UART5 interrupt handler
|
|
*//****************************************************************************/
|
|
void UART5_IRQHandler(void) {
|
|
if (LL_USART_IsActiveFlag_RXNE(UART5)) { // RX interrupt
|
|
uint8_t d = LL_USART_ReceiveData8(UART5); // read received byte
|
|
uint_fast16_t wr = Uart5RxWrIdx;
|
|
wr = (wr + 1) & UART5_RXBUF_MASK; // new write index
|
|
Uart5RxBuf[wr] = d; // received data to buffer
|
|
Uart5RxWrIdx = wr; // Store new index
|
|
}
|
|
|
|
if (LL_USART_IsActiveFlag_TXE(UART5)) { // TX interrupt
|
|
uint_fast16_t rd = Uart5TxRdIdx;
|
|
uint_fast16_t wr = Uart5TxWrIdx;
|
|
if (wr != rd) { // data in buffer
|
|
rd = (rd + 1) & UART5_TXBUF_MASK; // new read index
|
|
LL_USART_TransmitData8(UART5, Uart5TxBuf[rd]); // send data byte
|
|
Uart5TxRdIdx = rd; // Store new index
|
|
if (wr == rd) { // data buffer empty
|
|
LL_USART_DisableIT_TXE(UART5); // INT disable
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/***************************************************************************//**
|
|
* @brief Send byte to UART
|
|
* @param d: byte to send
|
|
*//****************************************************************************/
|
|
void Uart5_PutByte(uint8_t d) {
|
|
uint_fast16_t wr = Uart5TxWrIdx;
|
|
wr = (wr + 1) & UART5_TXBUF_MASK; // new write index
|
|
if (wr == Uart5TxRdIdx) { // No free space in buffer (overflow)
|
|
return; // drop remaining data (Attention! Buffer overflow not signaled! Use bigger buffer)
|
|
}
|
|
Uart5TxBuf[wr] = d; // Store data in buffer
|
|
Uart5TxWrIdx = wr; // Store new index
|
|
LL_USART_EnableIT_TXE(UART5); // Interrupt enable (start send)
|
|
}
|
|
|
|
|
|
/***************************************************************************//**
|
|
* @brief Send more data to UART
|
|
* @param src: data to send
|
|
* @param n: count of data
|
|
*//****************************************************************************/
|
|
void Uart5_PutData (void* src, uint16_t n) {
|
|
uint8_t* p = src;
|
|
uint_fast16_t wr = Uart5TxWrIdx;
|
|
while (n) {
|
|
wr = (wr + 1) & UART5_TXBUF_MASK; // new write index
|
|
if (wr == Uart5TxRdIdx) { // No free space in buffer (overflow)
|
|
break; // drop remaining data (Attention! Buffer overflow not signaled! Use bigger buffer)
|
|
}
|
|
Uart5TxBuf[wr] = *p; // Store data in buffer
|
|
p++;
|
|
n--;
|
|
}
|
|
Uart5TxWrIdx = wr; // Store new index
|
|
LL_USART_EnableIT_TXE(UART5); // Interrupt enable (start send)
|
|
}
|
|
|
|
/***************************************************************************//**
|
|
* @brief Read data from UART RX buffer
|
|
* @return received character, -1: no data in RX buffer
|
|
*//****************************************************************************/
|
|
int16_t Uart5_GetByte(void) {
|
|
uint_fast16_t rd = Uart5RxRdIdx;
|
|
if (rd != Uart5RxWrIdx) { // new data in buffer
|
|
rd = (rd + 1) & UART5_RXBUF_MASK; // new read index
|
|
Uart5RxRdIdx = rd; // store new index
|
|
return Uart5RxBuf[rd]; // return with data
|
|
}else {
|
|
return -1; // buffer empty
|
|
}
|
|
}
|
|
|