test port for rs232,用PB9写的串口通讯测试程序，带有总线方式，可根据自己情况修改代码。-test for RS232 port with PB9 write the serial communications testing procedures with a bus, according to its own circumstances can modify the code.

S3C44B0X加MCP2515扩展CAN总线接口，代码很适合初学者学习

汽车整车控制器开发板资料以及测试代码包括CAN总线收发-Automotive vehicle controller development board data and test code, including CAN bus transceiver