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Adding ADC Driver Library Block

In the example model mcb_pmsm_foc_sim, the current controller block receives the motor phase current in ADC counts from the plant model that converts the motor phase current from Amperes to ADC counts. In the target hardware, the current controller reads the motor phase current from the ADC block. Follow this workflow to add the ADC driver block.

In the Texas Instruments™ BOOSTXL-DRV8305 inverter hardware, the phase-A current of the motor is read from ADC C2 channel and phase-B current is read from ADC B2 channel. Select ADC module C and channel 2 to obtain the phase-A current of the motor. Select ADC module B and channel 2 to obtain the phase-B current of the motor. For other target hardware, select the ADC module and channel where the motor phase currents are interfaced.

Select ePWM1_ADCSOCA as the trigger source in the ADC block because the PWM library block triggers the start-of-conversion event SOC0 when the PWM counter equals the PWM period register.

Select ADCINT1 in the ADC B module. This triggers an ADC interrupt at the end-of-conversion (EOC) event. When the ADC interrupt occurs, the FOC current control algorithm executes.

In the Simulink® library browser, select and add the ADC block from the F2837xD library in Embedded Coder® Support Package for Texas Instruments C2000™ Processors. Configure the ADC block to read the phase-A and phase-B currents of the motor.

In the ADC block parameters dialog box, configure the ADC C module and Channel 2 to read the phase-A current of the motor, as shown in this table.

Tab and Parameter in ADC BlockSettings

SOC Trigger > ADC Module

C

SOC Trigger > SOC trigger number

SOC0

SOC Trigger > SOC trigger source

ePWM1_ADCSOCA

Input Channels > Conversion channel

ADCIN2

Rename the block as ADC_C_IN2.

In ADC block parameters dialog box, configure the ADC B module and channel 2 (to read Motor Phase-B current) and the ADC interrupt (ADCINT1), as shown in this table.

Tab and Parameter in ADC BlockSettings

SOC Trigger > ADC Module

B

SOC Trigger > SOC trigger number

SOC0

SOC Trigger > SOC trigger source

ePWM1_ADCSOCA

SOC Trigger > Post interrupt at AOC trigger

on

SOC Trigger > Interrupt selection

ADCINT1

SOC Trigger > ADCINT1 continuous mode

on

Input Channels > Conversion channel

ADCIN2

Rename the block as ADC_B_IN2.