20250322在荣品的PRO-RK3566开发板的buildroot系统下使用内置命令测试UART1

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于 2025-03-22 11:29:20 发布

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root@rk3566-buildroot:/# udevadm info /dev/ttyS1
root@rk3566-buildroot:/# stty -F /dev/ttyS1
root@rk3566-buildroot:/# stty -F /dev/ttyS1
root@rk3566-buildroot:/# stty -F /dev/ttyS1 raw 115200 cs8 -parenb -cstopb
root@rk3566-buildroot:/# stty -F /dev/ttyS1
root@rk3566-buildroot:/# echo "hello" >> /dev/ttyS1
root@rk3566-buildroot:/# cat /dev/ttyS1

./uart_test /dev/ttyS1 115200 8 0 1

20250322在荣品的PRO-RK3566开发板的buildroot系统下使用内置命令测试UART1
2025/3/22 11:14

./uart_test /dev/ttyS1 115200 8 0 1

20250321在荣品的PRO-RK3566开发板的buildroot系统下使用UART1
2025/3/21 17:27

缘起：需要在荣品的PRO-RK3566开发板/产品的buildroot系统下使用UART1。
根据DTS文件，很容易知道UART被被用作AP6256的UART1接口了。直接全部屏蔽掉。

@余顺?我司RK3566的buildroot项目不需要WIFI/BT AP6256，请问如何彻底关闭？
BT用的UART1用作通讯用。直接关闭AP6256以免潜在的隐患

可以通过./build.sh kernle-config 查看对应的驱动是否是在内核加载的
要从根源上禁止掉，启动的加载系统的时候是否有insmod bcmdhd.ko，可以找这个etc下的脚本，或wlan 相关的脚本

代码修改的部分：
Z:\source\kernel\arch\arm64\boot\dts\rockchip\rk356x\pro-rk3566.dts

&i2c1 {
status = "okay";
};

&i2c4 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&i2c4m1_xfer>;

rtc@51 {
status = "okay";
compatible = "rtc,hym8563";
reg = <0x51>;
};
};

&usbdrd_dwc3 {
dr_mode = "host";
extcon = <&usb2phy0>;
status = "okay";
};

&uart1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart1m0_xfer>;
};

&uart3 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart3m0_xfer>;
};

&uart6 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart6m0_xfer>;
};

&uart7 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart7m0_xfer>;
};

&uart9 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart9m0_xfer>;
};

&spi1 {
status = "okay";

spi1_dev@0 {
compatible = "rockchip,spidev";
reg = <0>;
spi-max-frequency = <12000000>;
spi-lsb-first;
};

};

&sdmmc2 {
max-frequency = <150000000>;
supports-sdio;
bus-width = <4>;
disable-wp;
cap-sd-highspeed;
cap-sdio-irq;
keep-power-in-suspend;
mmc-pwrseq = <&sdio_pwrseq>;
non-removable;
pinctrl-names = "default";
pinctrl-0 = <&sdmmc2m0_bus4 &sdmmc2m0_cmd &sdmmc2m0_clk>;
sd-uhs-sdr104;
status = "okay";
};

//&uart1 {
// status = "okay";
// pinctrl-names = "default";
// pinctrl-0 = <&uart1m1_xfer &uart1m1_ctsn>;
//};

//&wireless_bluetooth {
// uart_rts_gpios = <&gpio4 RK_PB6 GPIO_ACTIVE_LOW>;
// pinctrl-names = "default", "rts_gpio";
// pinctrl-0 = <&uart1m1_rtsn>;
// pinctrl-1 = <&uart1_gpios>;
// BT,reset_gpio = <&gpio4 RK_PA5 GPIO_ACTIVE_HIGH>;
// BT,wake_gpio = <&gpio4 RK_PA6 GPIO_ACTIVE_HIGH>;
// BT,wake_host_irq = <&gpio4 RK_PB1 GPIO_ACTIVE_HIGH>;
// status = "okay";
//};

&wireless_wlan {
pinctrl-names = "default";
pinctrl-0 = <&wifi_host_wake_irq>;
WIFI,host_wake_irq = <&gpio3 RK_PD4 GPIO_ACTIVE_HIGH>;
};

&rk_headset {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&hp_det>;
headset_gpio = <&gpio3 RK_PA1 GPIO_ACTIVE_HIGH>;
};

&pinctrl {
rp-pins {
rp_bat_pins: rp-bat-pins {
rockchip,pins =
<0 RK_PC7 RK_FUNC_GPIO &pcfg_pull_up>,
<0 RK_PC5 RK_FUNC_GPIO &pcfg_pull_none>;
};
};

headphone {
hp_det: hp-det {
rockchip,pins = <3 RK_PA1 RK_FUNC_GPIO &pcfg_pull_down>;
};
};

wireless-wlan {
wifi_host_wake_irq: wifi-host-wake-irq {
rockchip,pins = <3 RK_PD4 RK_FUNC_GPIO &pcfg_pull_down>;
};
};

//wireless-bluetooth {
// uart1_gpios: uart1-gpios {
// rockchip,pins = <4 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
// };
//};
};

&rk809_codec {
mic-in-differential;
};

确认GPIO口的状态：
pin 75 (gpio2-11): (MUX UNCLAIMED) gpio2:75
pin 76 (gpio2-12): (MUX UNCLAIMED) (GPIO UNCLAIMED)

pin 126 (gpio3-30): fe650000.serial (GPIO UNCLAIMED) function uart1 group uart1m1-xfer
pin 127 (gpio3-31): fe650000.serial (GPIO UNCLAIMED) function uart1 group uart1m1-xfer

pin 75 (gpio2-11): fe650000.serial gpio2:75 function uart1 group uart1m0-xfer
pin 76 (gpio2-12): fe650000.serial (GPIO UNCLAIMED) function uart1 group uart1m0-xfer

pin 126 (gpio3-30): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 127 (gpio3-31): (MUX UNCLAIMED) (GPIO UNCLAIMED)

2.测试串口
2.1 节点配置好后，烧录运行，一般会在/dev/下面看到类似ttyS0，ttyS1等设备文件，它对应的就是uart0，查看串口信息：
udevadm info /dev/ttyS1

通过上面命令，可以看到如下串口信息，注意地址，它与uart在dtsi中定义的地址对应，比如下面ttyS0地址对应uart0的0xfdd50000

2.2 串口波特率

stty -F /dev/ttyS1 查看波特率
stty -F /dev/ttyS1 raw 115200 cs8 -parenb -cstopb 设置波特率为115200

stty命令
1. 串口配置
stty -F /dev/ttyS1 raw 115200 cs8 -parenb -cstopb

/dev/ttyS1 :串口文件描述符
115200 :波特率为115200
cs8 :数据位8位
-parenb :无校验位
-cstopb :1位停止位
raw：显示原始值，不进行转义。如果不加raw的话，从串口发送数据到设备，shell不能显示。

stty --help帮助文档：

N ：set the input and output speeds to N bauds
设置波特率为N，例如9600 4800

csN： set character size to N bits, N in [5…8]
设置数据位为N，例如cs8 ，cs7

[-]cstopb：use two stop bits per character (one with ‘-’)
设置停止位：
cstopb：2位停止位
-cstopb：1位停止位

[-]parenb：generate parity bit in output and expect parity bit in input（在输出中产生奇偶校验位，并要求在输入中也有奇偶校验位）
parenb使终端进行奇偶校验，-parenb则是禁止校验
-parenb：无校验位

[-]parodd：set odd parity (or even parity with ‘-’)
parenb parodd：奇校验
parenb -parodd：偶校验

2.3 linux命令对串口读写

cat /dev/ttyS1 读取串口收到的信息
echo "hello" >> /dev/ttyS1 向串口发送信息

3. python脚本测试串口
3.1 要向自动测试串口，使用python是一个不错的选择，需要安装python3串口支持：

sudo apt install python3-serial

完整的LOG：

root@rk3566-buildroot:/#
root@rk3566-buildroot:/# udevadm info /dev/ttyS1
P: /devices/platform/fe650000.serial/tty/ttyS1
N: ttyS1
E: DEVNAME=/dev/ttyS1
E: DEVPATH=/devices/platform/fe650000.serial/tty/ttyS1
E: MAJOR=4
E: MINOR=65
E: SUBSYSTEM=tty

root@rk3566-buildroot:/#
root@rk3566-buildroot:/# stty -F /dev/ttyS1
[ 238.797615] of_dma_request_slave_channel: dma-names property of node '/serial@fe650000' missing or empty
speed 9600 baud; line = 0;
[ 238.797674] dw-apb-uart fe650000.serial: failed to request DMA, use interrupt mode
-brkint -imaxbel
root@rk3566-buildroot:/#
root@rk3566-buildroot:/# stty -F /dev/ttyS1
speed 9600 baud; line = 0;
-brkint -imaxbel
root@rk3566-buildroot:/#
root@rk3566-buildroot:/# stty -F /dev/ttyS1 raw 115200 cs8 -parenb -cstopb
root@rk3566-buildroot:/#
root@rk3566-buildroot:/# stty -F /dev/ttyS1
speed 115200 baud; line = 0;
min = 1; time = 0;
-brkint -icrnl -imaxbel
-opost
-isig -icanon
root@rk3566-buildroot:/#
root@rk3566-buildroot:/# echo "hello" >> /dev/ttyS1
root@rk3566-buildroot:/#
root@rk3566-buildroot:/# cat /dev/ttyS1
5aA*E5aA*E^C
root@rk3566-buildroot:/#