STM32F767 ADC Multi-Channel Interrupt Mode Read

[Andrew Hazelton]

Hi.

I am trying to read 4 ADC Channels sequentially in interrupt mode: ADC2_IN7, ADC2_IN14, ADC2_IN15 and ADC2_IN8. However it only reads the last rank channel every time. Please help me understand what I'm doing wrong.

Compiler:          IAR Workbench v8.32.1

MCU: STM32F767II

Hardware:     Custom PCB

HAL Version:    V1.15.0

void main (void)
{
 ...
 Analogue_Inputs_Initialise();
 ...
 while(1)
 {
 ADC_CH_Rank_ctr = 1;
 HAL_ADC_Start_IT(&ADC3Handle);
 HAL_Delay(100);
 }
}
 
 
void Analogue_Inputs_Initialise (void)
{
 GPIO_InitTypeDef GPIO_InitStruct;
 ADC_ChannelConfTypeDef sConfig;
 
 
 /********************************
 * ADC 3 - AI1, AI2, AI3, AI4 *
 ********************************/
 // Configure ADC Clock
 __HAL_RCC_ADC3_CLK_ENABLE();
 
 // Analogue Input 1 - PF7 - ADC3_IN5
 // Analogue Input 2 - PF8 - ADC3_IN6
 __HAL_RCC_GPIOF_CLK_ENABLE();
 GPIO_InitStruct.Pin = GPIO_PIN_7 | GPIO_PIN_8;
 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
 // Analogue Input 3 - PC1 - ADC3_IN11
 __HAL_RCC_GPIOC_CLK_ENABLE();
 GPIO_InitStruct.Pin = GPIO_PIN_1;
 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 // Analogue Input 4 - PA0 - ADC3_IN0
 __HAL_RCC_GPIOA_CLK_ENABLE();
 GPIO_InitStruct.Pin = GPIO_PIN_0;
 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
 
 // Configure the ADC3 peripheral
 ADC3Handle.Instance = ADC3;
 ADC3Handle.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV8;
 ADC3Handle.Init.Resolution = ADC_RESOLUTION_12B;
 ADC3Handle.Init.ScanConvMode = ENABLE; 
 ADC3Handle.Init.ContinuousConvMode = ENABLE; 
 ADC3Handle.Init.DiscontinuousConvMode = DISABLE; 
 ADC3Handle.Init.NbrOfDiscConversion = 0;
 ADC3Handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; 
 ADC3Handle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
 ADC3Handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
 ADC3Handle.Init.NbrOfConversion = 4;
 ADC3Handle.Init.DMAContinuousRequests = DISABLE;
 ADC3Handle.Init.EOCSelection = ADC_EOC_SEQ_CONV;
 HAL_ADC_Init(&ADC3Handle);
 
 
 // Analogue Input 1 - PF7 - ADC3_IN5
 sConfig.Channel = ADC_CHANNEL_5; 
 sConfig.Rank = ADC_REGULAR_RANK_1; 
 sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES; 
 sConfig.Offset = 0; 
 HAL_ADC_ConfigChannel(&ADC3Handle, &sConfig); 
 
 // Analogue Input 2 - PF8 - ADC3_IN6
 sConfig.Channel = ADC_CHANNEL_6; 
 sConfig.Rank = ADC_REGULAR_RANK_2; 
 sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES; 
 sConfig.Offset = 0; 
 HAL_ADC_ConfigChannel(&ADC3Handle, &sConfig);
 
 // Analogue Input 3 - PC1 - ADC3_IN11
 sConfig.Channel = ADC_CHANNEL_11; 
 sConfig.Rank = ADC_REGULAR_RANK_3; 
 sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES; 
 sConfig.Offset = 0; 
 HAL_ADC_ConfigChannel(&ADC3Handle, &sConfig);
 
 // Analogue Input 4 - PA0 - ADC3_IN0
 sConfig.Channel = ADC_CHANNEL_0; 
 sConfig.Rank = ADC_REGULAR_RANK_4; 
 sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES; 
 sConfig.Offset = 0; 
 HAL_ADC_ConfigChannel(&ADC3Handle, &sConfig); 
 
 
 // NVIC configuration for ADC Reception complete interrupt
 HAL_NVIC_SetPriority(ADC_IRQn, 6, 0);
 HAL_NVIC_EnableIRQ(ADC_IRQn); 
}
 
 
void ADC_IRQHandler(void)
{
 HAL_ADC_IRQHandler(&ADC3Handle);
}
 
 
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* AdcHandle)
{
 if( __HAL_ADC_GET_FLAG( AdcHandle, ADC_FLAG_EOC ) )
 {
 switch( ADC_CH_Rank_ctr )
 {
 case 1: HMI_Inputs_Outputs.Analog_Input_CH_1 = HAL_ADC_GetValue(AdcHandle); ADC_CH_Rank_ctr++; break;
 case 2: HMI_Inputs_Outputs.Analog_Input_CH_2 = HAL_ADC_GetValue(AdcHandle); ADC_CH_Rank_ctr++; break;
 case 3: HMI_Inputs_Outputs.Analog_Input_CH_3 = HAL_ADC_GetValue(AdcHandle); ADC_CH_Rank_ctr++; break;
 case 4: HMI_Inputs_Outputs.Analog_Input_CH_4 = HAL_ADC_GetValue(AdcHandle); 
 ADC_CH_Rank_ctr++; 
 HAL_ADC_Stop_IT(&ADC3Handle); 
 break;
 default: /* Do Nothing */ break;
 }
 }
}