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1. 测试方法是
echo string 到串口节点, 接PC端用串口工具读取,
echo "teststring" > /dev/ttyS4
然后PC端发送,cat 串口节点查看
cat /dev/ttyS4
2.
cat /sys/kernel/debug/pinctrl/pinctrl-rockchip-pinctrl/pinmux-pins
pin 32 (gpio1-0): feb90000.serial (GPIO UNCLAIMED) function uart6 group uart6m1-xfer
pin 33 (gpio1-1): feb90000.serial (GPIO UNCLAIMED) function uart6 group uart6m1-xfer
pin 42 (gpio1-10): feb70000.serial (GPIO UNCLAIMED) function uart4 group uart4m2-xfer
pin 43 (gpio1-11): feb70000.serial (GPIO UNCLAIMED) function uart4 group uart4m2-xfer
cat pinconf-pins
pin 32 (gpio1-0): input bias pull up (1 ohms), output drive strength (8 mA), input schmitt enabled
pin 33 (gpio1-1): input bias pull up (1 ohms), output drive strength (8 mA), input schmitt enabled
pin 42 (gpio1-10): input bias pull up (1 ohms), output drive strength (8 mA), input schmitt enabled
pin 43 (gpio1-11): input bias pull up (1 ohms), output drive strength (8 mA), input schmitt enabled
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