I'm using ADC1 of STM32L452CC.
Multi ADCs are connected to 2 Potentiometers and battery level port on ADC1.
2 Potentialmeters are connected to channel 5(PA0) and 6(PA1). (pin10, pin 11)
And battery is connected to channel 16(PB1) like below.(pin 19)
However the battery level ADC value is changed continuously when other ADC value is changing.
Like below, (other adc value is flow : x , battery value is battery : x)
shutoff : 0 flow : 1 battery : 2076
shutoff : 0 flow : 1 battery : 2067
shutoff : 0 flow : 1 battery : 2069
shutoff : 0 flow : 1 battery : 2069
shutoff : 0 flow : 0 battery : 2068
shutoff : 0 flow : 1497 battery : 2148
shutoff : 0 flow : 2234 battery : 2271
shutoff : 0 flow : 2568 battery : 2285
shutoff : 0 flow : 2812 battery : 2294
shutoff : 0 flow : 3058 battery : 2301
shutoff : 0 flow : 3146 battery : 2307
shutoff : 0 flow : 3148 battery : 2308
shutoff : 0 flow : 3145 battery : 2308
I attached the source.
static void MX_ADC1_Init(void)
{
/* USER CODE BEGIN ADC1_Init 0 */
/* USER CODE END ADC1_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC1_Init 1 */
/* USER CODE END ADC1_Init 1 */
/** Common config
*/
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc1.Init.LowPowerAutoWait = DISABLE;
hadc1.Init.ContinuousConvMode = DISABLE;
hadc1.Init.NbrOfConversion = 3;
hadc1.Init.DiscontinuousConvMode = ENABLE;
hadc1.Init.NbrOfDiscConversion = 3;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.DMAContinuousRequests = DISABLE;
hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc1.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_5;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_47CYCLES_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_6;
sConfig.Rank = ADC_REGULAR_RANK_2;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_16;
sConfig.Rank = ADC_REGULAR_RANK_3;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC1_Init 2 */
/* USER CODE END ADC1_Init 2 */
}
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
static uint8_t adcIndex = 0;
static uint32_t adc_temp[3];
adc_temp[adcIndex] = HAL_ADC_GetValue(&hadc1);
if(adcIndex == 2)
{
adc_value[adc_SHUTOFF] = adc_temp[0];
adc_value[adc_FLOW] = adc_temp[1];
adc_value[adc_BATTERY] = adc_temp[2];
}
adcIndex++;
if(adcIndex > 2)
{
adcIndex = 0;
}
HAL_ADC_Start_IT(&hadc1);
}
