Extern Potentiometer MCSDK

[Undertaker]

Hello,

I bought the STM32 Nucleo Pack with the Nucleo-F302R8, the X-Nucleo-IHM07M1 and a three-phase motor.

I use MCSDK to control my motor and it's no problem.

But when I want to add an external potentiometer to the ADC, I can't get the values from it.

I've tried lots of things, but nothing works.

To be sure of my potentiometer and my program, I tried with a simple program that doesn't use MCSDK, and everything worked perfectly.

Here is the configuration of my MX_ADC1_Init with mcsdk activated:

static void MX_ADC1_Init(void)
{
/* USER CODE BEGIN ADC1_Init 0 */
/* USER CODE END ADC1_Init 0 */

ADC_AnalogWDGConfTypeDef AnalogWDGConfig = {0};
ADC_InjectionConfTypeDef sConfigInjected = {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_SYNC_PCLK_DIV1;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc1.Init.ContinuousConvMode = DISABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.DataAlign = ADC_DATAALIGN_LEFT;
hadc1.Init.NbrOfConversion = 3;
hadc1.Init.DMAContinuousRequests = DISABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc1.Init.LowPowerAutoWait = DISABLE;
hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}

/** Configure Analog WatchDog 1 */
AnalogWDGConfig.WatchdogNumber = ADC_ANALOGWATCHDOG_1;
AnalogWDGConfig.WatchdogMode = ADC_ANALOGWATCHDOG_SINGLE_INJEC;
AnalogWDGConfig.HighThreshold = 0;
AnalogWDGConfig.LowThreshold = 0;
AnalogWDGConfig.Channel = ADC_CHANNEL_9;
AnalogWDGConfig.ITMode = DISABLE;
if (HAL_ADC_AnalogWDGConfig(&hadc1, &AnalogWDGConfig) != HAL_OK)
{
Error_Handler();
}

/** Configure Injected Channel */
sConfigInjected.InjectedChannel = ADC_CHANNEL_9;
sConfigInjected.InjectedRank = ADC_INJECTED_RANK_1;
sConfigInjected.InjectedSingleDiff = ADC_SINGLE_ENDED;
sConfigInjected.InjectedNbrOfConversion = 1;
sConfigInjected.InjectedSamplingTime = ADC_SAMPLETIME_19CYCLES_5;
sConfigInjected.ExternalTrigInjecConvEdge = ADC_EXTERNALTRIGINJECCONV_EDGE_FALLING;
sConfigInjected.ExternalTrigInjecConv = ADC_EXTERNALTRIGINJECCONV_T1_TRGO;
sConfigInjected.AutoInjectedConv = DISABLE;
sConfigInjected.InjectedDiscontinuousConvMode = DISABLE;
sConfigInjected.QueueInjectedContext = DISABLE;
sConfigInjected.InjectedOffset = 0;
sConfigInjected.InjectedOffsetNumber = ADC_OFFSET_NONE;
if (HAL_ADCEx_InjectedConfigChannel(&hadc1, &sConfigInjected) != HAL_OK)
{
Error_Handler();
}

/** Configure Regular Channel */
sConfig.Channel = ADC_CHANNEL_2;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.SamplingTime = ADC_SAMPLETIME_181CYCLES_5;
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_8;
sConfig.Rank = ADC_REGULAR_RANK_2;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}

/** Configure Regular Channel */
sConfig.Channel = ADC_CHANNEL_5; //Potentiometer
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 */

}

[Karl Yamashita]

Use the </> when posting code. It properly formats it and so it's easier to view the code instead of all the text left hand adjusted

 

You need to do is post code on where and how you're using your code along side with the MCSDK.

[Undertaker]

Hello,
I can't post my code today but I can explain how it works.
For now, I just want to read the potentiometer value at the beginning of while(1) and just after start the motor for a while.
Once I'm sure that the potentiometer reading program is correct, I'll use this value as the setpoint for the motor.

[cedric H]

Hello @Undertaker,

With MCSDK 6.4.0 or 6.3.2, the potentiometer feature is already proposed. You can just enable it from the "Stage configuration" window as shown below:

Once enabled, generate your project, and you will have all the leisure to read and understand the code.

The only condition to have the possibility to enable the potentiometer is that it is described in the power board (or inverter) and the signal is connected to an ADC input pin (which is the case in your pack).

[Undertaker]

Hi @cedric H, sorry for the delay,

If I understand your solution correctly, I need to activate the internal potentiometer on the IHM07M1. Once I have generated my project, I need to find out how the potentiometer is used and modify or copy this function for my external potentiometer.

In my case, I prefer to copy and modify its use, but this seems to be a difficult task for a single external potentiometer.

[MotorHobbyist]

Hello @Undertaker 

I think you need to go over the regular conversion manager component, you can access it through about->Documations->Components->Regular Conversion Manager in the MCSDK V6.4. This way user is able to define their own custom conversion

Regards

[Undertaker · Accepted solution]

Hello @MotorHobbyist ,

Before you sent me this information, I tried something myself. And I think it's similar to your method.

I added my external potentiometer in ADC by STM32CubeMX with the parameters:

PA4 - IN5 - Analog mode - No pull-up and No pull-down

Then I added in ADC_Regular_Conversion_Mode a new row with the parameters: 181.5 Cycles - No offset - 0

Then in STM32CubeIDE, I modified mc_config_common.c, mc_config_common.h and mc_app_hooks.c.

In the first, I added this code at the end in the user section:

uint16_t ExtPotentiometer_ValuesBuffer_M1[ 1 << POTENTIOMETER_LPF_BANDWIDTH_POW2_M1 ];

/*
 * Potentiometer instance for motor 1
 */
RegConv_t ExtPotRegConv_M1 =
{
  .regADC              = ADC1,
  .channel             = MC_ADC_CHANNEL_5,
  .samplingTime        = POTENTIOMETER_ADC_SAMPLING_TIME_M1,
  .data                = 0
};

Potentiometer_Handle_t ExtPotentiometer_M1 = {
  .LPFilterBandwidthPOW2 = POTENTIOMETER_LPF_BANDWIDTH_POW2_M1,
  .PotMeasArray          = ExtPotentiometer_ValuesBuffer_M1
};

In the second, I added this:

extern Potentiometer_Handle_t ExtPotentiometer_M1;
extern RegConv_t ExtPotRegConv_M1;

Finally, in the last one, I modified it like this :

__weak void MC_APP_BootHook(void)
{
  /* RCM component initialization */
  (void)RCM_RegisterRegConv(&PotRegConv_M1);
  SPDPOT_Init(&SpeedPotentiometer_M1);
  /* USER CODE BEGIN BootHook */
    RCM_RegisterRegConv(&ExtPotRegConv_M1);
    POT_Init(&ExtPotentiometer_M1);
  /* USER CODE END BootHook */
}

/**
 * @brief Hook function called right after the Medium Frequency Task for Motor 1.
 *
 *
 *
 */
__weak void MC_APP_PostMediumFrequencyHook_M1(void)
{
  uint16_t rawValue = RCM_GetRegularConv(&PotRegConv_M1);
  if (SDC_GetOpenLoopFlag(pOLS[M1]))
  {
    SDC_Potentiometer_Run(pOLS[0], rawValue);
  }
  else
  {
    (void)SPDPOT_Run(&SpeedPotentiometer_M1, rawValue);
  }

  /* USER SECTION BEGIN PostMediumFrequencyHookM1 */
    uint16_t rawExtPotValue = RCM_GetRegularConv(&ExtPotRegConv_M1);
    POT_TakeMeasurement(&ExtPotentiometer_M1, rawExtPotValue);
  /* USER SECTION END PostMediumFrequencyHookM1 */
}

Then to retrieve my value in main.c I do like this:

#include "potentiometer.h"
extern SpeedPotentiometer_Handle_t SpeedPotentiometer_M1;
extern Potentiometer_Handle_t ExtPotentiometer_M1;
  if (POT_ValidValueAvailable(&ExtPotentiometer_M1))
  {
	  uint16_t extVal = POT_GetValue(&ExtPotentiometer_M1)>>4;
  }

Now I just have to check that it doesn't interfere with the motor

Regards
.

[MotorHobbyist]

The method introduced by ST itself seems more preferable to me, it's so much easier to do a conversion by using just a couple of functions and you do not need to apply any change to the source files and the header files anymore.

Regards!

[Undertaker]

Hello @MotorHobbyist,

I agree with you and have tried your method, but I have a lot of problems with it, so I think I'll stick with my methodology which is very similar in terms of code.

Regards

[cedric H]

Hi @Undertaker,

There is no difference between internal or external potentiometer.

If you have a potentiometer connected to your IHM07 board, then you can modify your board description to describe your potentiometer. 

Here is the description of the potentiometer coming with the IHM07. MR24 means that the potentiometer_level signal is connected to the Morpho connector Right at the 24th position.

You can add your own potentiometer to another pin of the morpho connector : MRyy (yy morpho pin number)

        {
          "name": "Potentiometer",
          "type": "Potentiometer",
          "hwVariants": [
            {
              "type": "Potentiometer",
              "help": {
                "en": "Make sure that R78 is soldered and is a 0 Ohm resistor."
              },
              "signals": {
                "POTENTIOMETER_LEVEL": [
                  {
                    "name": "MR24",
                    "help": {
                      "en": "CN10.24"
                    },
                    "cost": 0
                  },
                  {
                    "name": "MRyy",
                    "help": {
                      "en": "My own potentiometer connected to Morpho Right yy"
                    },
                    "cost": 0
                  }
                ]
              },
              "potVm": 3.3,
              "potRmax": 100000,
              "potLevelMin": 0
            }
          ]
        },

Doing this, the Workbench will propose you to select the MCU pin connected to your own potentiometer reachable through the connector MRyy at the condition that it reaches a MCU pin connected to an ADC_IN channel. After project generation, compilation and flash the new binary, you will be able to control your motor speed without any additional line of code. In order to take into account your board modifications, you must restart a new project with your updated board.

Hope it helps.

Regards

Cedric