2020-07-09 06:00 AM
Hi everyone,
I am trying to read ADC values from 4 different channels
PC0 ------> ADC1_IN1
PC1 ------> ADC1_IN2
PC2 ------> ADC1_IN3
PC3 ------> ADC1_IN4
I am able to get different values from different channel for the 1st iteration. but from the 2nd iteration i am getting same values from the last read channel in the 1st iteration.
Please help me to figure out this issue.
static void MX_ADC1_Init(void)
{
/* USER CODE BEGIN ADC1_Init 0 */
/* USER CODE END ADC1_Init 0 */
LL_ADC_CommonInitTypeDef ADC_CommonInitStruct = {0};
LL_ADC_InitTypeDef ADC_InitStruct = {0};
LL_ADC_REG_InitTypeDef ADC_REG_InitStruct = {0};
LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
/* Peripheral clock enable */
LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_ADC);
LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOC);
/**ADC1 GPIO Configuration
PC0 ------> ADC1_IN1
PC1 ------> ADC1_IN2
PC2 ------> ADC1_IN3
PC3 ------> ADC1_IN4
*/
GPIO_InitStruct.Pin = LL_GPIO_PIN_0|LL_GPIO_PIN_1|LL_GPIO_PIN_2|LL_GPIO_PIN_3;
GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
LL_GPIO_Init(GPIOC, &GPIO_InitStruct);
/* USER CODE BEGIN ADC1_Init 1 */
/*## Configuration of NVIC #################################################*/
/* Configure NVIC to enable ADC1 interruptions */
NVIC_SetPriority(ADC1_IRQn, 0);
NVIC_EnableIRQ(ADC1_IRQn);
/* USER CODE END ADC1_Init 1 */
/** Common config
*/
ADC_CommonInitStruct.CommonClock = LL_ADC_CLOCK_SYNC_PCLK_DIV2;
LL_ADC_CommonInit(__LL_ADC_COMMON_INSTANCE(ADC1), &ADC_CommonInitStruct);
ADC_InitStruct.Resolution = LL_ADC_RESOLUTION_12B;
ADC_InitStruct.DataAlignment = LL_ADC_DATA_ALIGN_RIGHT;
ADC_InitStruct.LowPowerMode = LL_ADC_LP_AUTOWAIT;
LL_ADC_Init(ADC1, &ADC_InitStruct);
ADC_REG_InitStruct.TriggerSource = LL_ADC_REG_TRIG_SOFTWARE;
ADC_REG_InitStruct.SequencerLength =LL_ADC_REG_SEQ_SCAN_ENABLE_4RANKS;
ADC_REG_InitStruct.SequencerDiscont = LL_ADC_REG_SEQ_DISCONT_DISABLE;
ADC_REG_InitStruct.ContinuousMode =LL_ADC_REG_CONV_SINGLE;
ADC_REG_InitStruct.DMATransfer = LL_ADC_REG_DMA_TRANSFER_NONE;
ADC_REG_InitStruct.Overrun = LL_ADC_REG_OVR_DATA_OVERWRITTEN;
LL_ADC_REG_Init(ADC1, &ADC_REG_InitStruct);
LL_ADC_SetOverSamplingScope(ADC1, LL_ADC_OVS_DISABLE);
LL_ADC_DisableIT_EOC(ADC1);
LL_ADC_DisableIT_EOS(ADC1);
/** Configure Regular Channel
*/
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_1, LL_ADC_CHANNEL_4);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_4, LL_ADC_SAMPLINGTIME_2CYCLES_5);
LL_ADC_SetChannelSingleDiff(ADC1, LL_ADC_CHANNEL_4, LL_ADC_SINGLE_ENDED);
/** Configure Regular Channel
*/
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_2, LL_ADC_CHANNEL_1);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_1, LL_ADC_SAMPLINGTIME_2CYCLES_5);
LL_ADC_SetChannelSingleDiff(ADC1, LL_ADC_CHANNEL_1, LL_ADC_SINGLE_ENDED);
/** Configure Regular Channel
*/
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_3, LL_ADC_CHANNEL_2);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_2, LL_ADC_SAMPLINGTIME_2CYCLES_5);
LL_ADC_SetChannelSingleDiff(ADC1, LL_ADC_CHANNEL_2, LL_ADC_SINGLE_ENDED);
/** Configure Regular Channel
*/
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_4, LL_ADC_CHANNEL_3);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_3, LL_ADC_SAMPLINGTIME_2CYCLES_5);
LL_ADC_SetChannelSingleDiff(ADC1, LL_ADC_CHANNEL_3, LL_ADC_SINGLE_ENDED);
/* USER CODE BEGIN ADC1_Init 2 */
/* USER CODE END ADC1_Init 2 */
}
void Activate_ADC(void)
{
if (LL_ADC_IsEnabled(ADC1) == 0)
{
/* Disable ADC deep power down (enabled by default after reset state) */
LL_ADC_DisableDeepPowerDown(ADC1);
/* Enable ADC internal voltage regulator */
LL_ADC_EnableInternalRegulator(ADC1);
wait_loop_index = ((LL_ADC_DELAY_INTERNAL_REGUL_STAB_US * (SystemCoreClock / (100000 * 2))) / 10);
while(wait_loop_index != 0)
{
wait_loop_index--;
}
/* Run ADC self calibration */
LL_ADC_StartCalibration(ADC1, LL_ADC_SINGLE_ENDED);
while (LL_ADC_IsCalibrationOnGoing(ADC1) != 0)
{
}
/* Delay between ADC end of calibration and ADC enable. */
while(wait_loop_index != 0)
{
wait_loop_index--;
}
/* Enable ADC */
LL_ADC_Enable(ADC1);
while (LL_ADC_IsActiveFlag_ADRDY(ADC1) == 0)
{
}
}
}
uint8_t adc_read()
{
uint8_t ADC_value1,ADC_value2,ADC_value3,ADC_value4;
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_1, LL_ADC_CHANNEL_4);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_4, LL_ADC_SAMPLINGTIME_2CYCLES_5);
LL_ADC_SetChannelSingleDiff(ADC1, LL_ADC_CHANNEL_4, LL_ADC_SINGLE_ENDED);
Configure_ADC();
Activate_ADC();
ADC_value1 = LL_ADC_REG_ReadConversionData12(ADC1);
LL_ADC_REG_StopConversion(ADC1);
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_2, LL_ADC_CHANNEL_1);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_1, LL_ADC_SAMPLINGTIME_2CYCLES_5);
LL_ADC_SetChannelSingleDiff(ADC1, LL_ADC_CHANNEL_1, LL_ADC_SINGLE_ENDED);
Configure_ADC();
Activate_ADC();
ADC_value2 = LL_ADC_REG_ReadConversionData12(ADC1);
LL_ADC_REG_StopConversion(ADC1);
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_3, LL_ADC_CHANNEL_2);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_2, LL_ADC_SAMPLINGTIME_2CYCLES_5);
LL_ADC_SetChannelSingleDiff(ADC1, LL_ADC_CHANNEL_2, LL_ADC_SINGLE_ENDED);
Configure_ADC();
Activate_ADC();
ADC_value3 = LL_ADC_REG_ReadConversionData12(ADC1);
LL_ADC_REG_StopConversion(ADC1);
LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_4, LL_ADC_CHANNEL_3);
LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_3, LL_ADC_SAMPLINGTIME_2CYCLES_5);
LL_ADC_SetChannelSingleDiff(ADC1, LL_ADC_CHANNEL_3, LL_ADC_SINGLE_ENDED);
Configure_ADC();
Activate_ADC();
ADC_value4= LL_ADC_REG_ReadConversionData12(ADC1);
LL_ADC_REG_StopConversion(ADC1);
}
Please help me to resolve this issue.
2021-08-15 12:02 PM
Try:
ADC_REG_InitStruct.ContinuousMode = LL_ADC_REG_CONV_CONTINUOUS;