问题描述
我正在使用 SAMA5D27-SOM-EK1 嵌入式板。
我使用 YOCTO 项目版本SUMO为它构建了 Linux 映像操作系统。
I am using SAMA5D27-SOM-EK1 embedded board.I build for it Linux image OS using YOCTO project version SUMO.
我需要知道设备的 GPIOS （特别是gpios-led和gpios键）和板子的映射。
I need to know device's GPIOS ( gpios-leds and gpios keys specialy) and the mapping of the board.
例如，在板终端中输入 / sys / firmware / devicetree / base / leds / red 时，我可以找到gpio文件，但是当我打开它时我看不懂的符号。
我想我可以在生成的设备树中找到这些东西，但是我找不到它的路径！
When I enter in /sys/firmware/devicetree/base/leds/red for example in the board terminal I can find gpio file but when i open it there are symbols which i can't read.I think that I can find such things in the generated Device Tree but i can't find its path!
请帮助我出来
推荐答案
以下是原始dts：
相关部分是：
leds {
compatible = "gpio-leds";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_led_gpio_default>;
status = "okay"; /* Conflict with pwm0. */
red {
label = "red";
gpios = <&pioA PIN_PA10 GPIO_ACTIVE_HIGH>;
};
green {
label = "green";
gpios = <&pioA PIN_PB1 GPIO_ACTIVE_HIGH>;
};
blue {
label = "blue";
gpios = <&pioA PIN_PA31 GPIO_ACTIVE_HIGH>;
linux,default-trigger = "heartbeat";
};
};
这表明红色LED连接到PA10 gpio，绿色在PB1上，蓝色在PA31上
This shows that the red LED is connected to the PA10 gpio, green is on PB1 and blue on PA31.
查找信息的另一种方法是在此处查看原理图：
The other way to find the info is to look at the schematics here:http://ww1.microchip.com/downloads/en/DeviceDoc/SAMA5D27-SOM1-EK1_Board%20Files_1.B.B.zip
SAMA5D27-SOM1-EK1_REVB.pdf的第3页总结了引脚混合，第8页显示了实际的连接。
Page 3 of SAMA5D27-SOM1-EK1_REVB.pdf sums the pinmuxing and page 8 shows the actual connection.
关于您想做什么（如果我没记错的话，切换LED），您只需看一下 / sys / class / leds / red /亮度在该文件中写入0将在写入1时将其关闭，然后将其打开。
Regarding what you want to do (toggling the led if I remember correctly), you can simply have a look at /sys/class/leds/red/brightness writing 0 in that file will turn it off while writing 1, will turn it on.
这篇关于在哪里可以找到SAMA5D27-SOM1-EK1设备及其GPIOS的映射？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！