4.8 UART驱动调试

&uart0 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&uart0_xfer &uart0_ctsn>;
};

&uart4 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&uart4m1_xfer>;        
};

&uart7 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&uart7m1_xfer>;        
};

rk3568_aybering:/ # linux_485_test /dev/ttyS7 115200 100 "ttyS7 send test"
/dev/ttyS7 115200 N 1
After receiving 'exit' or EXIT', exit!
<SendThread-312> gpio is 100
<RecvThread-189> gpio is 100
send: ==> ttyS7 send test
recv <== uart 7 recv test
send: ==> ttyS7 send test
recv <== uart 7 recv test
send: ==> ttyS7 send test
recv <== uart 7 recv test
send: ==> ttyS7 send test
recv <== uart 7 recv test
send: ==> ttyS7 send test
recv <== uart 7 recv test
send: ==> ttyS7 send test
recv <== uart 7 recv test
send: ==> ttyS7 send test
recv <== uart 7 recv test
send: ==> ttyS7 send test
recv <== uart 7 recv test
^C
130|rk3568_aybering:/ # 

这块比较简单，就直接上代码了。