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use circle queue for STM32_UART recv

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李昂 2023-09-12 02:09:19 +00:00 committed by Gitee
parent 070c552519
commit 21e17dee67
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GPG Key ID: 173E9B9CA92EEF8F
1 changed files with 17 additions and 30 deletions
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47
package/STM32/pika_hal_stm32_UART.c
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@ -1910,7 +1910,8 @@ typedef struct platform_UART {
struct stm32_uart* rt_uart;
struct serial_configure config;
uint8_t rxBuff[RX_BUFF_LENGTH];
size_t rxBuffOffset;
size_t writePointer;
size_t readPointer;
} platform_UART;
int pika_hal_platform_UART_open(pika_dev* dev, char* name) {
@ -2035,43 +2036,29 @@ static pika_dev* find_uart_from_handle(UART_HandleTypeDef* handle){
}
void HAL_UART_RxCpltCallback(UART_HandleTypeDef* huart) {
pika_dev* uart = find_uart_from_handle(huart);
platform_UART* pika_uart = uart->platform_data;
char inputChar = pika_uart->rxBuff[pika_uart->rxBuffOffset];
/* avoid recive buff overflow */
if (pika_uart->rxBuffOffset + 2 > RX_BUFF_LENGTH) {
memmove(pika_uart->rxBuff, pika_uart->rxBuff + 1, RX_BUFF_LENGTH);
UART_Start_Receive_IT(
huart, (uint8_t*)(pika_uart->rxBuff + pika_uart->rxBuffOffset), 1);
return;
}
pika_dev* uart = find_uart_from_handle(huart);
platform_UART* pika_uart = uart->platform_data;
/* recive next char */
pika_uart->rxBuffOffset++;
pika_uart->rxBuff[pika_uart->rxBuffOffset] = 0;
UART_Start_Receive_IT(
huart, (uint8_t*)(pika_uart->rxBuff + pika_uart->rxBuffOffset), 1);
return;
// Increment writePointer, wrap around if needed
pika_uart->writePointer = (pika_uart->writePointer + 1) % RX_BUFF_LENGTH;
// Start receiving next character
UART_Start_Receive_IT(huart, (uint8_t*)(pika_uart->rxBuff + pika_uart->writePointer), 1);
}
int pika_hal_platform_UART_read(pika_dev* dev, void* buf, size_t count) {
platform_UART* pika_uart = (platform_UART*)dev->platform_data;
size_t length = count;
if (length >= pika_uart->rxBuffOffset) {
/* not enough str */
length = pika_uart->rxBuffOffset;
size_t dataAvailable = (pika_uart->writePointer + RX_BUFF_LENGTH - pika_uart->readPointer) % RX_BUFF_LENGTH;
size_t length = count < dataAvailable ? count : dataAvailable;
for (size_t i = 0; i < length; i++) {
((char*)buf)[i] = pika_uart->rxBuff[pika_uart->readPointer];
pika_uart->readPointer = (pika_uart->readPointer + 1) % RX_BUFF_LENGTH;
}
memcpy(buf, pika_uart->rxBuff, length);
/* update rxBuff */
memmove(pika_uart->rxBuff, pika_uart->rxBuff + length,
pika_uart->rxBuffOffset - length);
pika_uart->rxBuffOffset -= length;
pika_uart->rxBuff[pika_uart->rxBuffOffset] = 0;
UART_Start_Receive_IT(&pika_uart->rt_uart->handle, (uint8_t*)(pika_uart->rxBuff + pika_uart->writePointer), 1);
UART_Start_Receive_IT(
&pika_uart->rt_uart->handle,
(uint8_t*)(pika_uart->rxBuff + pika_uart->rxBuffOffset), 1);
return length;
}