SPI and I²c Debug Summary

These days debugging SPI and I²c, there are some small problems in the middle of this record.

The first is the setting of the address of the I²C device, if the i²c is set to a 7-byte address, the address bit is 7 bits high. The lowest bit is the read/write bit. Write in the code.

The address of the device requires a high 7-bit and a low 1-bit complement of 0.

SPI data is garbled but the data is common, and is generally a problem of setup. Chip selection pin, only the device is selected for communication.