ICM20948 DMP代码详解（41）

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上一回解析了inv_icm20948_read_secondary函数的第1段代码，本回解析余下的两段代码。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_configure_secondary_read(): set secondary registers for reading.
The chip must be set as bank 3 before calling.
* This is derived from inv_icm20948_read_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 we wish to access
* len is the number of bytes to be read
* 
*/
int