Feature Proposal: Display STM32 Internal Temperature in VESC Tool

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Feature Proposal: Display STM32 Internal Temperature in VESC Tool

Description

I would like to propose a feature to integrate the internal STM32 MCU temperature into VESC Tool. When a board gets connected, it would be beneficial to have the temperature displayed alongside the Motor and FET temperature.

This solution was implemented on a custom board with an STM32F405xx chip.

Hardware Configuration

For the hardware configuration, I added the following constants and macro definitions:

#define HW_ADC_CHANNELS 18
#define HW_ADC_INJ_CHANNELS 3
#define HW_ADC_NBR_CONV 6

// ADC Indexes
#define ADC_IND_SENS1 0
#define ADC_IND_SENS2 1
#define ADC_IND_SENS3 2
#define ADC_IND_CURR1 3
#define ADC_IND_CURR2 4
#define ADC_IND_CURR3 5
#define ADC_IND_VIN_SENS 11
#define ADC_IND_EXT 6
#define ADC_IND_TEMP_MOS 8
#define ADC_IND_TEMP_MOTOR 9
#define ADC_IND_VREFINT 12
#define ADC_IND_MCU_TEMP 15

// MCU Internal Temperature Sensor Constants
#define MCU_TEMP_V25 0.76f     // Voltage at 25°C
#define MCU_TEMP_SLOPE 0.0025f // Volts per Degree Celsius
#define MCU_TEMP_OFFSET 25.0f

// MCU Low Pass Filter
#define MCU_TEMP_LPF_BETA 0.01f

// Macro to get stm32 temp
#define GET_MCU_TEMP() (((ADC_VOLTS(ADC_IND_MCU_TEMP) - MCU_TEMP_V25) / MCU_TEMP_SLOPE) + MCU_TEMP_OFFSET)

// This is how I set up the ADC channels
void hw_setup_adc_channels(void)
{
	// ADC1 regular channels
	ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 2, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 3, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 4, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC1, ADC_Channel_Vrefint, 5, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC1, ADC_Channel_TempSensor, 6, ADC_SampleTime_15Cycles);

	// ADC2 regular channels
	ADC_RegularChannelConfig(ADC2, ADC_Channel_1, 1, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC2, ADC_Channel_11, 2, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC2, ADC_Channel_6, 3, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC2, ADC_Channel_15, 4, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC2, ADC_Channel_0, 5, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC2, ADC_Channel_1, 6, ADC_SampleTime_15Cycles);

	// ADC3 regular channels
	ADC_RegularChannelConfig(ADC3, ADC_Channel_2, 1, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC3, ADC_Channel_12, 2, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC3, ADC_Channel_3, 3, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC3, ADC_Channel_13, 4, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC3, ADC_Channel_1, 5, ADC_SampleTime_15Cycles);
	ADC_RegularChannelConfig(ADC3, ADC_Channel_2, 6, ADC_SampleTime_15Cycles);

	// Injected channels
	ADC_InjectedChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_15Cycles);
	ADC_InjectedChannelConfig(ADC2, ADC_Channel_11, 1, ADC_SampleTime_15Cycles);
	ADC_InjectedChannelConfig(ADC3, ADC_Channel_12, 1, ADC_SampleTime_15Cycles);
	ADC_InjectedChannelConfig(ADC1, ADC_Channel_10, 2, ADC_SampleTime_15Cycles);
	ADC_InjectedChannelConfig(ADC2, ADC_Channel_11, 2, ADC_SampleTime_15Cycles);
	ADC_InjectedChannelConfig(ADC3, ADC_Channel_12, 2, ADC_SampleTime_15Cycles);
	ADC_InjectedChannelConfig(ADC1, ADC_Channel_10, 3, ADC_SampleTime_15Cycles);
	ADC_InjectedChannelConfig(ADC2, ADC_Channel_11, 3, ADC_SampleTime_15Cycles);
	ADC_InjectedChannelConfig(ADC3, ADC_Channel_12, 3, ADC_SampleTime_15Cycles);
}

// This is how we extract the temp in the custom app code
float current_temp = GET_MCU_TEMP();
if (mcu_temp_filtered_deg_c == 0.0f)
{
	mcu_temp_filtered_deg_c = current_temp;
}
else
{
	UTILS_LP_FAST(mcu_temp_filtered_deg_c, current_temp, MCU_TEMP_LPF_BETA);
}