[英]STM32L011 cannot set USART in rx mode
I am using STM32L011K4T6.我正在使用 STM32L011K4T6。 I want to receive a command from USART2 and do a specific action from that command.
我想从 USART2 接收命令并从该命令执行特定操作。 Data that is not that command should be ignored.
应该忽略不是该命令的数据。
My problem is that I don't receive any data on the USART.我的问题是我没有收到关于 USART 的任何数据。 The RxCallback funtion is never called.
RxCallback 函数永远不会被调用。 No data is ever shown in the RDR register, so i'm thinking the HAL_UART_Receive_IT doesn't act like i think it does (set usart in rx mode with RX interrupt set).
RDR 寄存器中从未显示任何数据,所以我认为 HAL_UART_Receive_IT 的行为不像我认为的那样(将 usart 设置为 rx 模式并设置 RX 中断)。
UartHandle.Instance = USART2;
UartHandle.Init.BaudRate = 9600;
UartHandle.Init.WordLength = UART_WORDLENGTH_9B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_EVEN;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
if (HAL_UART_DeInit(&UartHandle) != HAL_OK) {
Error_Handler();
}
if (HAL_UART_Init(&UartHandle) != HAL_OK) {
Error_Handler();
}
//Set USART in RX mode
if (HAL_UART_Receive_IT(&UartHandle, (uint8_t*) g_commandReceived, 2)
!= HAL_OK) {
Error_Handler();
}
while (1) {
if (STATE == 0x01) {
//Open LED, and go back to waiting for a command
BSP_LED_On(LED3);
memset(g_commandReceived, 0x00, sizeof(g_commandReceived));
if (HAL_UART_Receive_IT(&UartHandle, (uint8_t*) g_commandReceived,2) != HAL_OK) {
Error_Handler();}
STATE = 0x00;}
}
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle) {
if (UartHandle->Instance == USART2) {
if ((g_commandReceived[0] == 0x31) && (g_commandReceived[1] == 0x32)) {
STATE = 0x01;
}
}
}
I tried do send data, then receive it, and that strangely works as expected.我尝试发送数据,然后接收它,并且奇怪地按预期工作。
if (HAL_UART_Transmit_IT(&UartHandle, (uint8_t*) MyMessege, 0x08)
!= HAL_OK) {
Error_Handler();
}
while (UartReady != SET) {
}
UartReady = RESET;
/*Put UART peripheral in reception process ###########################*/
if (HAL_UART_Receive_IT(&UartHandle, (uint8_t *) aRxBuffer2, 8) != HAL_OK) {
Error_Handler();}
I usually work with a custom HAL package, so I don't really understand how this function work.我通常使用自定义的 HAL package,所以我不太明白这个 function 是如何工作的。
I assume what you're looking for is a way to raise an interrupt for any received message through USART.我假设您正在寻找的是一种为通过 USART 接收到的任何消息引发中断的方法。
To get interrupts working with STM HAL functions, this usually is the approach:要使中断与 STM HAL 函数一起工作,通常是这样的方法:
HAL_UART_Receive_IT
,HAL_UART_Receive_IT
启用外设的中断生成,USARTx_IRQHandler
USARTx_IRQHandler
If one of these steps is missing, then it most likely won't work.如果缺少其中一个步骤,则很可能无法正常工作。 Enabling the interrupt generation at the peripheral level (
HAL_UART_Receive_IT
) is not enough, because the NVIC will not jump to the ISR if that interrupt is not enabled at the NVIC level.在外设级别启用中断生成 (
HAL_UART_Receive_IT
) 是不够的,因为如果在 NVIC 级别未启用该中断,NVIC 将不会跳转到 ISR。
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