我在使用 FreeRTOS 的 STM32F407 上遇到问题。到目前为止，发送到 xbee 模块的大部分消息都已发送。只有有时（5 到 60 分钟后）TX 过程会被中断。
在调试会话中，我可以看到，在 2 个字节（约 40 个）之后不再设置 TXEIE。UART_HandleTypeDef 的 TxXferCount 也是 42 (TxXferSize: 44)。SR-Register 中的标志 TXE 已设置，但 CR1-Register 中的 TXEIE 未设置。
ISR 激活了 2 次以将它们存储到数据/移位寄存器中。这我可以在逻辑分析仪上看到。但我无法弄清楚写作任务/isr的来源。
Xbee 模块获取消息并发送响应消息。感谢您的任何回复！
初始化：
GPIO_InitTypeDef GPIO_InitStruct;
__GPIOA_CLK_ENABLE();
__GPIOD_CLK_ENABLE();
__GPIOF_CLK_ENABLE();
/* RX-TX PIN */
GPIO_InitStruct.Pin = XBEE1_TX_PIN | XBEE1_RX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
HAL_GPIO_Init(XBEE1_TX_PORT, &GPIO_InitStruct);
/* Power*/
GPIO_InitStruct.Pin = XBEE1_PWR_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
HAL_GPIO_Init(XBEE1_PWR_PORT, &GPIO_InitStruct);
HAL_GPIO_WritePin(XBEE1_PWR_PORT, XBEE1_PWR_PIN, GPIO_PIN_SET);
/* Reset PIN */
GPIO_InitStruct.Pin = XBEE1_RESET_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
HAL_GPIO_Init(XBEE1_RESET_PORT, &GPIO_InitStruct);
/* SLEEP_RQ PIN */
GPIO_InitStruct.Pin = XBEE1_SLEEP_RQ_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
HAL_GPIO_Init(XBEE1_SLEEP_RQ_PORT, &GPIO_InitStruct);
__USART2_CLK_ENABLE();
uart.Instance = USART2;
uart.Init.BaudRate = baud;
uart.Init.WordLength = UART_WORDLENGTH_8B;
uart.Init.StopBits = UART_STOPBITS_1;
uart.Init.Parity = UART_PARITY_NONE;
uart.Init.HwFlowCtl = UART_HWCONTROL_NONE;
uart.Init.Mode = UART_MODE_TX_RX;
if (HAL_UART_Init(&uart) != HAL_OK) {
Error_Handler(XBEE1_ERROR);
}
//clear pending IRQs
__HAL_UART_CLEAR_FLAG(&uart, UART_FLAG_RXNE);
__HAL_UART_CLEAR_FLAG(&uart, USART_FLAG_TC);
__HAL_UART_CLEAR_FLAG(&uart, USART_FLAG_ORE);
__HAL_UART_CLEAR_FLAG(&uart, USART_FLAG_PE);
__HAL_UART_CLEAR_FLAG(&uart, USART_FLAG_FE);
__HAL_UART_CLEAR_FLAG(&uart, USART_FLAG_NE);
__HAL_UART_CLEAR_FLAG(&uart, USART_FLAG_TXE);
/* NVIC */
HAL_NVIC_SetPriority(USART2_IRQn, 6, 0);
HAL_NVIC_EnableIRQ(USART2_IRQn);
传输
HAL_StatusTypeDef UART_Xbee1::send( uint8_t* pdata, size_t sz ) {
return HAL_UART_Transmit_IT(&uart, pdata, sz);
}
情监侦
extern "C" void USART2_IRQHandler(void){
testpin1.on();
UART_HandleTypeDef* uart_c = &(Argos::xbee1->uart);
uint32_t tmp1 = 0;
uint32_t tmp2 = 0;
tmp1 = __HAL_UART_GET_FLAG(uart_c, UART_FLAG_RXNE);
tmp2 = __HAL_UART_GET_IT_SOURCE(uart_c, UART_IT_RXNE);
if((tmp1 != RESET) && (tmp2 != RESET)){
uint8_t in = (uint8_t)(uart_c->Instance->DR & (uint8_t)0x00FF);
*uart_c->pRxBuffPtr++ = in;
//overwrite expected bytes, when packet size is known
if(xbee1->inApiRecMode){
if( (uart_c->RxXferSize-uart_c->RxXferCount) == 1 ){
xbee1->apiSize = 0;
xbee1->apiSize = in << 8;
}else if( (uart_c->RxXferSize-uart_c->RxXferCount) == 2 ){
xbee1->apiSize |= in;
uart_c->RxXferCount = xbee1->apiSize + 2;
}
}
if( ((uart_c->RxXferCount)-1) == 0){
(uart_c->RxXferCount)--;
__HAL_UART_DISABLE_IT(uart_c, UART_IT_RXNE);
/* Check if a transmit process is ongoing or not */
if(uart_c->State == HAL_UART_STATE_BUSY_TX_RX){
uart_c->State = HAL_UART_STATE_BUSY_TX;
}else{
/* Disable the UART Parity Error Interrupt */
__HAL_UART_DISABLE_IT(uart_c, UART_IT_PE);
/* Disable the UART Error Interrupt: (Frame error, noise error, overrun error) */
__HAL_UART_DISABLE_IT(uart_c, UART_IT_ERR);
uart_c->State = HAL_UART_STATE_READY;
}
Message* msg = &(xbee1->msg_callBack);
msg->code = (uint8_t) XbeeContext::MessageType::RECEIVE_EVENT;
msg->value = 0;
xbee1->rcvCallback->sendMsg(msg);
}else if( (uart_c->RxXferCount) == 0){
Error_Handler(XBEE1_ERROR);
}else{
(uart_c->RxXferCount)--;
}
}else{
//other cases
HAL_UART_IRQHandler( uart_c );
}
testpin1.off();
}