Unable to enable/disable/toggle BLUE LED in STM32L4R5ZI board.

[SP.3]

Hi,

I am trying to develop a simple example program to control the 3 User LED's in the nucleo-144 board.

Part number - STM32L4R5ZI

I have configured the following clock settings and BSP for the LED's.

Clock Settings:

/* Enable MSI oscillator and configure the PLL to reach the max system frequency (120 MHz)
  when using MSI oscillator as PLL clock source. */
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  HAL_PWR_EnableBkUpAccess();
  __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
 
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE | RCC_OSCILLATORTYPE_LSI| RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6; /* 4MHz */
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
  RCC_OscInitStruct.PLL.PLLM = 1;
  RCC_OscInitStruct.PLL.PLLN = 60;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK)
  {
	  /* Enable MSI in PLL mode */
	  HAL_RCCEx_EnableMSIPLLMode();
  }

  RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 };
    /* To avoid undershoot due to maximum frequency, select PLL as system clock source */
    /* with AHB prescaler divider 2 as first step */
    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK |                                  RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV2;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
    if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
{
    return FAILURE:
}
 

I hope the clock settings are fine.

Out of the 3 user LED's Red(PortB ; GPIO_PIN_14)and Green(PORT C ; GPIO_PIN_7) are working as expected, but BLUE LED(PortB ; GPIO_PIN_7) is not working.

Any clue would be of great help.

Thanks & Regards,

Shanmathi

[Mike_ST]

Please check MB1312 schematic and STM32L4R5 datasheet, and if necessary the BOM for Nucleo 144 STM32L4R5 , to check on what pin the blue LED is.

[SP.3]

Hi Mike,

I have checked with the schematic.

It is PB7 for Blue LED. Also mentioned in Board_Drawing_en.DM00368330.pdf

SB171 is open and SB172 is closed in the development kit.

[Mike_ST]

Maybe If you have SMPS version of the board, aka NUCLEO-L4R5ZI-P.

It may be connected to PB6 instead.

[SP.3]

Checked with the board. It is NUCLEO-L4R5ZI not NUCLEO-L4R5ZI-P.

But I tried now PB6 instead of PB7, still blue LED is not blinking.

[Tesla DeLorean]

Show the code configuring and blinking the LED, it will be a lot more enlightening than the clock code.​

[SP.3]

#define PINB_LED_R                      GPIO_PIN_14
#define PINB_LED_B                      GPIO_PIN_6
#define PINC_LED_G                      GPIO_PIN_7
 
BSP_LED_Connect(void)
{
        __HAL_RCC_GPIOB_CLK_ENABLE();
        __HAL_RCC_GPIOC_CLK_ENABLE();
 
	GPIO_Init.Pin = (PINB_LED_R | PINB_LED_B);
	GPIO_Init.Mode = GPIO_MODE_OUTPUT_PP;
	GPIO_Init.Pull = GPIO_NOPULL;
	GPIO_Init.Speed = GPIO_SPEED_FREQ_LOW;
	HAL_GPIO_Init(GPIOB, &GPIO_Init);
 
	GPIO_Init.Pin = PINC_LED_G;
	HAL_GPIO_Init(GPIOC, &GPIO_Init);
}
 
BSP_LED_Enable(void)
{
	HAL_GPIO_WritePin(GPIOB, (PINB_LED_R | PINB_LED_B), GPIO_PIN_RESET);
	HAL_GPIO_WritePin(GPIOC, PINC_LED_G, GPIO_PIN_RESET);
}
 
BSP_LED_Disable(void)
{
	LED_Off(NUCLEOL4_LED_ALL);
}
 
BSP_LED_Disconnect(void)
{
	HAL_GPIO_DeInit(GPIOB, (PINB_LED_R | PINB_LED_B));
	HAL_GPIO_DeInit(GPIOC, PINC_LED_G);
}
 
BSP_LED_Switch(uint32_t id, uint32_t command)
{
	switch (command)
	{
	case NUCLEOL4_LED_COMMAND_OFF:
		retcode = LED_Off(id);
		break;
	case NUCLEOL4_LED_COMMAND_ON:
		retcode = LED_On(id);
		break;
	case NUCLEOL4_LED_COMMAND_TOGGLE:
		retcode = LED_Toggle(id);
		break;
	default:
		break;
	}
}
 
/*---------------------- LOCAL FUNCTIONS IMPLEMENTATION ----------------------*/
LED_Off(uint32_t id)
{
	switch (id)
	{
	case NUCLEOL4_LED_ALL:
		HAL_GPIO_WritePin(GPIOB, (PINB_LED_R | PINB_LED_B), GPIO_PIN_RESET);
		HAL_GPIO_WritePin(GPIOC, PINC_LED_G, GPIO_PIN_RESET);
		break;
	case NUCLEOL4_LED_RED_ID:
		HAL_GPIO_WritePin(GPIOB, PINB_LED_R, GPIO_PIN_RESET);
		break;
	case NUCLEOL4_LED_GREEN_ID:
		HAL_GPIO_WritePin(GPIOC, PINC_LED_G, GPIO_PIN_RESET);
		break;
	case NUCLEOL4_LED_BLUE_ID:
		HAL_GPIO_WritePin(GPIOB, PINB_LED_B, GPIO_PIN_RESET);
		break;
	default:
		break;
	}
}
 
LED_On(uint32_t id)
{
	switch (id)
	{
	case NUCLEOL4_LED_ALL:
		HAL_GPIO_WritePin(GPIOB, (PINB_LED_R | PINB_LED_B), GPIO_PIN_SET);
		HAL_GPIO_WritePin(GPIOC, PINC_LED_G, GPIO_PIN_SET);
		break;
	case NUCLEOL4_LED_RED_ID:
		HAL_GPIO_WritePin(GPIOB, PINB_LED_R, GPIO_PIN_SET);
		break;
	case NUCLEOL4_LED_GREEN_ID:
		HAL_GPIO_WritePin(GPIOC, PINC_LED_G, GPIO_PIN_SET);
		break;
	case NUCLEOL4_LED_BLUE_ID:
		HAL_GPIO_WritePin(GPIOB, PINB_LED_B, GPIO_PIN_SET);
		break;
	default:
		break;
	}
}
 
LED_Toggle(uint32_t id)
{
	Retcode_T retcode = RETCODE_OK;
	switch (id)
	{
	case NUCLEOL4_LED_ALL:
		HAL_GPIO_TogglePin(GPIOB, (PINB_LED_R | PINB_LED_B));
		HAL_GPIO_TogglePin(GPIOC, PINC_LED_G);
		break;
	case NUCLEOL4_LED_RED_ID:
		HAL_GPIO_TogglePin(GPIOB, PINB_LED_R);
		break;
	case NUCLEOL4_LED_GREEN_ID:
		HAL_GPIO_TogglePin(GPIOC, PINC_LED_G);
		break;
	case NUCLEOL4_LED_BLUE_ID:
		HAL_GPIO_TogglePin(GPIOB, PINB_LED_B);
		break;
	default:
		break;
	}
}

Hi Clive,

Please find the code snippet for BSP settings of user LED's

[Mike_ST]

#define PINB_LED_B GPIO_PIN_6

[SP.3]

Note:

Tried with both GPIO_PIN_6 and GPIO_PIN_7 for #define PINB_LED_B.

Still the same issue resides.

I completely do not have any clue why only this BLUE LED is not working, while the other two are fine.

[Mike_ST]

Might be good idea to check the voltage across the LED, and check that the LED is actually working.