STM32WL with RGB, TIM16, PWM & DMA

[AElgh]

Hello Everyone, I'm driving the WS2812 RGB-LED using TIM16 CH1.

I have a very similar behavior as in this_post . The RGB works well just until MX_LoRaWAN_Process(void) then it doesn't work. I tried his solution but it didn't work(although I suspect the SYSTICK is not working).

 

The Waveform looks like this:

 

The solution in the post(using the following lines) didn't work for me:

 /* Wake up from STOP2 on button press */
 SystemClock_Config();
 HAL_ResumeTick();
 MX_TIM16_Init();

 

I also printed out the content of the LED_DATA_ARRAY(which contains the color data) and it seems fine.

The Mode is STOP-Mode2. What would be the problem here?

 

Thank you

Amir

 

[STTwo-32]

Hello @AElgh 

Are you disabling the Timer clock before entering the STOP Mode. If so, try to keep it enabled.

Best Regards.

STTwo-32

[AElgh]

Hi

This issue comes when I deactivate the  Debugger(DEBUGGER_ENABLED --> 0).

When DEBUGGER_ENABLED    1, everything works fine but as i need lower power consumption i want to deactivate it.

In an5406 it mentions that "The debug mode enables the SWD pins, even when the MCU goes in low-power mode."

however, neither PB8 nor DMA has anything to do with the serial-wire-debugging feature.

I'm trying to understand how to shut the debugger without interrupting the Functionality.

 

[AElgh]

In AN5406 Page 30 (9.3 Low-power functions), it mentioned "when the DMA is used to
print data to the console, the system must not enter a low-power mode below Sleep mode because the DMA
clock is switched off in Stop mode"

I put this code just before it entered the Stop-Mode2 Sleep but it doesn't seem to succeed:

void UTIL_SEQ_Idle(void)
{
	/* USER CODE BEGIN UTIL_SEQ_Idle_1 */

	if(!__HAL_RCC_DMA2_IS_CLK_SLEEP_ENABLED())
	{
		APP_LOG(TS_OFF, VLEVEL_M, "DMA2 Clock is not Enabled in Deep-Sleep\r\n\n");
		__HAL_RCC_DMA2_CLK_SLEEP_ENABLE();
	}
	HAL_SuspendTick();
	/* USER CODE END UTIL_SEQ_Idle_1 */
	UTIL_LPM_EnterLowPower();
	/* USER CODE BEGIN UTIL_SEQ_Idle_2 */
	HAL_ResumeTick();

	/* USER CODE END UTIL_SEQ_Idle_2 */
}

 

I still get the "HAL_TIM_PWM_Start_DMA Error" 

 

Any suggestion is appreciated.