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[FAQ] Program MCx BLDC motor driver through I2C using MSP430 LaunchPad

Eric Chen
Expert 7865 points
Other Parts Discussed in Thread: MSP-EXP430FR2355, MCF8316A, MCF8316AEVM, MCF8315A, MCT8329A, MCT8315A, MCT8316A

The MCx8xx family of integrated motor drivers contains registers and on-board EEPROM that can be interfaced and programmed using an external MCU such as a MSP430 over I2C.

This FAQ provides an example CCS firmware project and instructions to use the MSP-EXP430FR2355 LaunchPad to communicate and program the MCF8316A.

Firmware Project Description

This firmware will program hard-coded EEPROM register settings into the MCF8316A using the MSP-EXP430FR2355.

When the S1 side button on the MSP-EXP430FR2355 LaunchPad is pressed, the LaunchPad will write all the register settings configured in the firmware source code into the MCF8316A, then send an EEPROM write command to trigger the MCF8316A to store the settings into its EEPROM memory.

Afterwards, the LaunchPad will read back the EEPROM settings and verify whether the EEPROM register write was successful, indicated by the Red (fail) and Green (success) LED1 or LED2 on the LaunchPad.

The project consists of a single file – main.c

Hardware Connections

Signal

MSP-EXP430FR2355

MCF8316A Board

I2C SDA

P4.6

SDA

I2C SCL

P4.7

SCL

GND

GND

AGND

The example image here shows connection between the MSP-EXP430FR2355 LaunchPad and the MCF8316AEVM. But the MCF8316AEVM can be replaced with any custom PCB as long as SDA, SCL, and AGND are available.

Running the CCS Project

  1. Download the CCS project and extract into a folder: 2273.EEPROM_Program_MCF8316A_MSP-EXP430FR2355.zip
  2. Navigate to https://dev.ti.com/ide in your web browser and import the CCS project.
  3. Open main.c and modify the eeprom_regmap array to your desired settings:
  4. Build and download the code onto the MSP-EXP430FR2355 LaunchPad

Program Other MCx Devices

The same I2C commands can be used to program other MCx devices, such as MCT8316A, MCF8315A, MCT8315A, MCT8329A, etc.

  • Please ensure that the I2C_TARGET_ADDR is set to match the corresponding address configured in the MCx target device. 
  • Make sure the eeprom_array_size variable and the eeprom_regmap[] array are updated to match the size and content of the desired MCx device