UART DMA receive via RTOS

[Ala]

hey there

there is a simple question: how can I receive data on my UART in DMA mode using RTOS? recently I ran a project where I just get all the data right when they arrived using UART DMA. but not I what the whole process to be done using RTOS. how can I do that?

[Ala]

HELP:

I added some tasks to just check state of a pin, but what happens is that the scheduler stucks in the task of UART receive... why? I mean the added task do not need any resources and all of them have same priority...

void UARTTask(void const * arg)
{
		while(1)
		{
			  HAL_IWDG_Refresh(&hiwdg);  //Reload Watchdog inorder to prevent Micro Reset	
				UartDataRec_FUN();
		}
}
 
void SEND_Initial_AT_Task(void const * arg)
{
		while(1)
		{
 
     //stuff that I mentioned in privious posts ....
	}
	vTaskSuspend(SEND_Initial_AT_TaskHandle);
		}
}
 
void CheckAntenna_Task(void const * arg)
{
		while(1)
		{
			  HAL_IWDG_Refresh(&hiwdg);  //Reload Watchdog inorder to prevent Micro Reset	
				CheckAntenna();
		}
}

it doesn't go through CheckAntenna_Task() and stucks in UARTTask() where it receives via UART DMA, whyyyyy????

[Tilen MAJERLE]

Usually application isn't aware of length of data to receive. You may implement the approach as described on Github article:

https://github.com/MaJerle/stm32-usart-uart-dma-rx-tx

In a nutshell, it works like this:

• DMA TC and HT events are writing to message queue
• UART IDLE is writing to message queue
• dedicated thread is waiting for data from message queue and does processing of the data
• Process repeats forever