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TPS65987DDJ: TPS65987 : firmware upgrade by I2C

Part Number: TPS65987DDJ
Other Parts Discussed in Thread: TPS65988, TPS65987

I refer the document "TPS65987 and TPS65988 SPI Flash Firmware Update Over I 2C" to implement firmware upgrade process. But I don't know the detail process of sending 4CC command.

Who can provide sample code or detail process for the function "ExecCmd"??