ICM20948 DMP代码详解（48）
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上一回解析了inv_icm20948_write_secondary函数的第2段代码，本回解析后续的代码。为了便于理解和回顾，再次贴出该函数源码，在EMD-Core\sources\Invn\Devices\Drivers\ICM20948\Icm20948AuxTransport.c中，如下：
/*
* inv_icm20948_write_secondary(): set secondary registers for writing?.
The chip must be set as bank 3 before calling.
* This is derived from inv_icm20948_write_secondary in linux...
* for now, uses a very simple data struct for the registers
*
* index gives the mapping to the particular SLVx registers
* addr is the physical address of the device to be accessed
* reg is the device register w