CH432 SPI 转 串口的开发资料。直接可用的，已经进过验证，完全没问题。你只要针对自己的平台修改就可用了。-CH432 SPI serial transfer of development information. Directly available, has been to verify, completely fine. As long as you can modify for their own platform use

CH432串口扩展芯片资料及应用电路。。。。。。。。。。。(CH432 serial port expansion chip data and application circuit)