DAC restricted to 0.5volt on a stm32L432 when you add a gpio_output to any PB

[PGood.1]

DAC restricted to 0.5volt on a stm32L432 when you add a gpio_output to any PB and appears to be the line __HAL_RCC_GPIOB_CLK_ENABLE(); added to MX_GPIO_Init

with

static void MX_GPIO_Init(void)

{

 GPIO_InitTypeDef GPIO_InitStruct = {0};

 /* GPIO Ports Clock Enable */

 __HAL_RCC_GPIOA_CLK_ENABLE();

 //__HAL_RCC_GPIOB_CLK_ENABLE();

 

void MX_GPIO_Init(void)

{

 GPIO_InitTypeDef GPIO_InitStruct = {0};

 /* GPIO Ports Clock Enable */

 __HAL_RCC_GPIOA_CLK_ENABLE();

 __HAL_RCC_GPIOB_CLK_ENABLE();

[PGood.1]

/* USER CODE BEGIN PFP */

uint32_t wave_time;

uint16_t sinwavevalue ;

uint16_t coswavevalue;

uint16_t sinwave[20] ={2681,3252,3705,3996,4095,3996,3705,3252,2681,2048,1415,844,391,100,0,100,391,844,1415,2048};

uint16_t coswave[20] ={3996,3705,3252,2681,2048,1415,844,391,100,0,100,391,844,1415,2048,2681,3252,3705,3996,4095};

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/

/* USER CODE BEGIN 0 */

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef * htim) {

 if (htim -> Instance == TIM15) {

    sinwavevalue=sinwave[wave_time];

    coswavevalue=coswave[wave_time];

     HAL_DAC_SetValue(&hdac1, DAC_CHANNEL_1, DAC_ALIGN_12B_R, sinwavevalue);

     HAL_DAC_Start(&hdac1,DAC_CHANNEL_1);

     HAL_DAC_SetValue(&hdac1, DAC_CHANNEL_2, DAC_ALIGN_12B_R, coswavevalue);

     HAL_DAC_Start(&hdac1,DAC_CHANNEL_2);

     wave_time++;

     if (wave_time==20) wave_time=0;

 }

}

/* USER CODE END 0 */

[waclawek.jan]

What hardware is this, a "known good" board such as Nucleo or Disco, or your own? Do you measure "Channel1" on PA5 or on some other pin? What else is connected to that pin?

JW

[Tesla DeLorean]

>>What else is connected to that pin?

Or anything else on GPIO BANK B.

Check for inter-connnects, shorts. Netlist?

uint32_t wave_time; // global or auto/local ?