Hello,
I have some Issues with LPUART1 on a STM32L081KZT. What I want to do is:
- Receive Data of variable length via LPUART1 using the HAL_UART_Receive function.
- Reading bytewise in a loop
- Using an External Interrupt to start the receive.
My Code looks like this:
void Receive_UART()
{
while(rs232_inbuf[rs232_inbuf_index-1] != LF){
HAL_UART_Receive(&hlpuart1, &rs232_inbuf[rs232_inbuf_index], 1, 100);
rs232_inbuf_index++;
if ((rs232_inbuf_index > 120))
{
rs232_inbuf_index = 0;
return;
}
}
rs232_tellen = --rs232_inbuf_index;
rs232_inbuf_index = 0;
HAL_UART_Transmit(&hlpuart1, (uint8_t*)&rs232_inbuf, rs232_tellen + 1, 100);
reset_inbuf();
}
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if(GPIO_Pin == 2){
Receive_UART();
return;
}
}
I can successfully read like this, but after the first HAL_UART_Receive, the code stops working and only interrupts can be used. When I use the Debugger to see what happens, I notice, that the code is stuck in stm32l0xx_hal_uart.c. It seems to me that it wait for a Flag, that it never receives from the UART. The function it is stuck in is HAL_StatusTypeDef UART_WaitOnFlagUntilTimeout(UART_HandleTypeDef *huart, uint32_t Flag, FlagStatus Status, uint32_t Tickstart, uint32_t Timeout).
It works fine with HAL_UART_Receive_IT, but I cant use that for reasons.
Please help.
