sending signal (UART) while running MotorControl

[JKong.3]

Hi,

I'm currently working on sending signals through FDCAN or UART of B-G431B-ESC1 while driving a motor.

I have written a debug code which sends UART data when a button is pressed.

However, the function is called once and never called again, nor the motor won't start.

"stm32g4xx_mc_it"

uint8_t mc_it_debug[64];

void EXTI15_10_IRQHandler (void)

{

/* USER CODE BEGIN START_STOP_BTN */

  sprintf(mc_it_debug, "StartStop Button Pressed\r\n");

  HAL_UART_Transmit_DMA(&huart2, mc_it_debug, sizeof(mc_it_debug));

  if (  0U == LL_EXTI_ReadFlag_0_31(LL_EXTI_LINE_10) )

  {

    /* Nothing to do */

  }

  else

  {

    LL_EXTI_ClearFlag_0_31 (LL_EXTI_LINE_10);

    ( void )UI_HandleStartStopButton_cb ();

  }

}

in the main.c file, 

/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();

/* USER CODE BEGIN Init */

/* USER CODE END Init */

/* Configure the system clock */
SystemClock_Config();

/* USER CODE BEGIN SysInit */

/* USER CODE END SysInit */

/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_ADC1_Init();
MX_ADC2_Init();
MX_COMP1_Init();
MX_COMP2_Init();
MX_COMP4_Init();
MX_CORDIC_Init();
MX_DAC3_Init();
MX_OPAMP1_Init();
MX_OPAMP2_Init();
MX_OPAMP3_Init();
MX_TIM1_Init();
MX_MotorControl_Init();
MX_FDCAN1_Init();
MX_USART2_UART_Init();

/* Initialize interrupts */
MX_NVIC_Init();

I am assuming it is a priority issue, which is set as 

Any advice will be helpful.

[JKong.3]

Update : HAL_UART_Transmit_IT() works

I'm guessing there's some conflict btw DMA and MotorControl

[JKong.3]

Update : FDCAN also works, so anyone who tries to use FDCAN, 

my setting is (for 170MHz clock)

I don't know what's wrong with DMA really.

[SofLit]

Hello,

Regarding your FDCAN bitrate config, I see 999999bit/s. So please try to find another values for NSEG1 and NSEG2 to have exactly 1000000bit/s (1Mb/s)

[LCE]

I cannot imagine that 1ppm deviation of the FDCAN bitrate is the problem here...

Do you do any analog debouncing of the button ? If not, do it in the source code, so suppress any button action for some time after each button action.

[JKong.3]

Ok, will do

[JKong.3]

Can you tell me the meaning of debouncing? I'm assuming what you're saying is create another callback for rising-edge interrupt of a button

UART_Transmit_IT and CANFD works fine, it's just that when I want to check if FDCAN is working by sending UART signals in FDCAN_TxBufferCompleteCallback by 

sprintf(debug_main, "FDCAN_TxCallback Called\r\n");
HAL_UART_Transmit_DMA(&huart2, debug_main, sizeof(debug_main));

DMA doesn't work(meaning it does not send data and the motor doesn't run), but when I change it to HAL_UART_Transmit_IT, it works fine.

[LCE · Accepted solution]

Search the web for basics about switches and debouncing.

And not only debouncing:
If you only check the level of the switch GPIO, think about the time it is actually pressed vs. the few micro-/ milliseconds it actually takes the MCU to perform stuff.
So before you release the switch, everything might be triggered several times, which might create several problems.

I would do the following:
- reduce the ISR to just set a flag and save the time (SysTick or some other timer)
- block or ignore the button interrupt for some time (check flag and SysTick)

[JKong.3]

I will research more on that. Thanks for your help.

[SofLit]

Trust me in some cases it could be 😉