Ginkgo I2C 主从模式收发数据配置及其结果

SzMZ

Ginkgo I2C master-slave mode send and receive data configuration and its results

1. Slave side：

Note: subaddress is 0, it is convenient to collect all the data.

2. Master side：

note: Select subaddress width of 2 bytes.

3. Send on master side：


4. Receive on slave side：


5. I2C works as slave mode, the first two bytes are subaddress, so sometimes it is thought that no data has been received,
    If you see the following waveform, it indicates that the communication has been successful,     because the ACK has already responded：


Therefore, at this time, the host can see the actual data by sending multiple bytes.

MarkZ

小结：
I2c 主模式，从模式的子地址配置规则：
只有从模式读操作，子地址配成0字节，其余都配置成2字节宽。
原因：芯片内部限制，而客户需求会0-4字节不等，所以折中设计为2字节宽。