My goal is to connect 2 internal PGAs to 1 ADC (especially ADC2).
I configured in CubeMX and generated source code.
However, when I checked the ADC channel initialization code in IDE project, I could see that only one channel is activated in ADC2.
/**
* @brief ADC2 Initialization Function
* @PAram None
* @retval None
*/
static void MX_ADC2_Init(void)
{
/* USER CODE BEGIN ADC2_Init 0 */
/* USER CODE END ADC2_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC2_Init 1 */
/* USER CODE END ADC2_Init 1 */
/** Common config
*/
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
hadc2.Init.Resolution = ADC_RESOLUTION_12B;
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc2.Init.GainCompensation = 0;
hadc2.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc2.Init.LowPowerAutoWait = DISABLE;
hadc2.Init.ContinuousConvMode = DISABLE;
hadc2.Init.NbrOfConversion = 1;
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc2.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc2.Init.DMAContinuousRequests = DISABLE;
hadc2.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc2.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc2) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_VOPAMP2;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC2_Init 2 */
/* USER CODE END ADC2_Init 2 */
}
I've tried it on several G-series MCUs, but they all show the same symptoms.
What is the problem?
I'm appreciate you for your interest in my question.
My goal is to have 1 MCU control 2 BLDC motors with minimal components.
So I want to configure the hardware in a way that the BLDCs are controlled through one shared shunt resistor.
And I want to minimize the components through internal OP amp and comparator.
I created a custom inverter board configuration using the board manager of the motor control workbench, and created CubeMX ioc file and IDE project using it.
(Motor Control WorkBench Version: 6.3.2 / STM32CubeMX Version 6.13.0 / STM32CubeIDE Version: 1.17.0)
And I was able to configure the Motor Control Workbench project through this custom board file.
I modified the current sensing circuit to connect only to ADC2.
This is the generated C initialization code of ADC2. However, there are no 2nd ADC channel.
/**
* @brief ADC2 Initialization Function
* @PAram None
* @retval None
*/
static void MX_ADC2_Init(void)
{
/* USER CODE BEGIN ADC2_Init 0 */
/* USER CODE END ADC2_Init 0 */
ADC_InjectionConfTypeDef sConfigInjected = {0};
/* USER CODE BEGIN ADC2_Init 1 */
/* USER CODE END ADC2_Init 1 */
/** Common config
*/
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc2.Init.Resolution = ADC_RESOLUTION_12B;
hadc2.Init.DataAlign = ADC_DATAALIGN_LEFT;
hadc2.Init.GainCompensation = 0;
hadc2.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc2.Init.LowPowerAutoWait = DISABLE;
hadc2.Init.ContinuousConvMode = DISABLE;
hadc2.Init.NbrOfConversion = 1;
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.DMAContinuousRequests = DISABLE;
hadc2.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc2.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc2) != HAL_OK)
{
Error_Handler();
}
/** Configure Injected Channel
*/
sConfigInjected.InjectedChannel = ADC_CHANNEL_VOPAMP3_ADC2;
sConfigInjected.InjectedRank = ADC_INJECTED_RANK_1;
sConfigInjected.InjectedSamplingTime = ADC_SAMPLETIME_6CYCLES_5;
sConfigInjected.InjectedSingleDiff = ADC_SINGLE_ENDED;
sConfigInjected.InjectedOffsetNumber = ADC_OFFSET_NONE;
sConfigInjected.InjectedOffset = 0;
sConfigInjected.InjectedNbrOfConversion = 2;
sConfigInjected.InjectedDiscontinuousConvMode = DISABLE;
sConfigInjected.AutoInjectedConv = DISABLE;
sConfigInjected.QueueInjectedContext = DISABLE;
sConfigInjected.ExternalTrigInjecConv = ADC_EXTERNALTRIGINJEC_T8_TRGO;
sConfigInjected.ExternalTrigInjecConvEdge = ADC_EXTERNALTRIGINJECCONV_EDGE_RISINGFALLING;
sConfigInjected.InjecOversamplingMode = DISABLE;
if (HAL_ADCEx_InjectedConfigChannel(&hadc2, &sConfigInjected) != HAL_OK)
{
Error_Handler();
}
/** Configure Injected Channel
*/
sConfigInjected.InjectedRank = ADC_INJECTED_RANK_2;
if (HAL_ADCEx_InjectedConfigChannel(&hadc2, &sConfigInjected) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC2_Init 2 */
/* USER CODE END ADC2_Init 2 */
}
This code does not initialize the 2 channels that I set, and only sets 1 channel twice.
I tried setting VOPAMP2 instead of ADC2_IN3 in case there was a problem with the channel, but the same problem still occurs.
I changed the MCU to STM32G471 and tested it, but the same problem occurred.
(Refer the attached ioc file - G473_ADC2_Assign_Test.ioc)
I can change it to set the channel manually, but I doubt the code involved will work properly.
So to solve this problem, I think I need to make the automatically generated code work properly.
