Adding ADC Driver Library Block

Step 2 of 7 in Add Hardware Drivers to Simulation Model and Deploy to Target Hardware

In the example model mcb_pmsm_foc_sim, the subsystem for current controller 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 driver block. Follow this workflow to add and configure the ADC driver block.

These steps explain addition and configuration of the ADC driver blocks in detail. In the Simulink^® library browser, select and add the ADC block from the F2837xD library in C2000™ Microcontroller Blockset. Use the following steps to configure the ADC blocks to read the phase-A and phase-B currents of the motor.

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. In the ADC driver block for phase-A current (see the following figure), select ADC module C and conversion channel 2 to obtain the phase-A current of the motor. In the ADC driver block for phase-B current, select ADC module B and conversion 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 SOC trigger source in the ADC driver blocks for phase-A and phase-B currents because the PWM library block triggers the start-of-conversion event SOC0 when the PWM counter equals the PWM period register.

In the ADC driver block for phase-B current (that uses ADC module B), select ADCINT1. 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 block parameters dialog box of ADC driver block for phase-A current, 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 Block	Settings
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 the block parameters dialog box of ADC driver block for phase-B current, configure the ADC B module and channel 2 to read phase-B current of the motor. In addition, configure ADC interrupt as ADCINT1, as shown in this table.

Tab and Parameter in ADC Block	Settings
SOC Trigger > ADC Module	B
SOC Trigger > SOC trigger number	SOC0
SOC Trigger > SOC trigger source	ePWM1_ADCSOCA
SOC Trigger > Post interrupt at EOC 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.

Add Hardware Drivers to Simulation Model and Deploy to Target Hardware

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