【创龙科技TLZ7x-EasyEVM-S评估板试用】创建linux系统
本帖最后由 liujing1232 于 2022-8-27 23:07 编辑Petalinux制作linux系统1配置基本配置信息如下：（1） 配置启动项
（2） 配置SD卡分区
（3） 首选SD启动设置
（4） 主机名设定
2文件系统配置主要包括如下：（1） gcc编译支持
（2） python支持
3 设备树另一个一个最重要的就是编写设备树文件，主要包括LED以及按键的设备树和axi_uart16550设备树文件的编写，内容如下：/include/ "system-conf.dtsi"/ { aliases{ ethernet0= &gem0; serial0= &uart1; }; gpio-keys{ compatible = "gpio-keys"; #gpio-cells = <2>; SW0 { label= "SW0"; #gpio-cells= <2>; gpios= <&axi_gpio_1 0x0 0x0 0x0>; linux,code= <108>; gpio-key,wakeup; autorepeat; }; SW1 { label= "SW1"; #gpio-cells= <2>; gpios= <&axi_gpio_1 0x1 0x0 0x0>; linux,code= <108>; gpio-key,wakeup; autorepeat; }; SW2 { label= "SW2"; #gpio-cells= <2>; gpios= <&axi_gpio_1 0x2 0x0 0x0>; linux,code= <108>; gpio-key,wakeup; autorepeat; }; }; gpio-leds{ compatible= "gpio-leds"; #gpio-cells= <2>; led-ld0{ label= "led-ld0"; #gpio-cells= <2>; gpios= <&axi_gpio_0 0x0 0 0x0>; default-state= "on"; linux,default-trigger= "default-on"; }; led-ld1{ label= "led-ld1"; #gpio-cells= <2>; gpios= <&axi_gpio_0 0x1 0 0x0>; default-state= "on"; linux,default-trigger= "default-on"; }; led-ld2{ label= "led-ld2"; #gpio-cells= <2>; gpios= <&axi_gpio_0 0x2 0 0x0>; default-state= "on"; linux,default-trigger= "default-on"; }; };};&axi_uart16550_0 { status= "okay"; port-number= <1>; current-speed= <57600>; xlnx,use-modem-ports= <0x0>; xlnx,use-user-ports= <0x0>;};
&axi_uart16550_1 { status= "okay"; port-number= <1>; current-speed= <57600>; xlnx,use-modem-ports= <0x0>; xlnx,use-user-ports= <0x0>;};实验启动界面如下：Boot
Kernel
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从上述界面可知，linux系统启动成功，输入密码和账户名即可。1查看各项驱动（1） gpio驱动
（2） uart 16550驱动
从上述信息可知成功启动了相应驱动。2 MIO LED实验该实验的LED实验情况如下：
实验现象如下： 代码如下：#include <stdio.h>#include <fcntl.h>#include <stdlib.h>#include <unistd.h>int main(){int value;int export;int direction;
//export GPIO controllerexport = open("/sys/class/gpio/export", O_WRONLY); if(export < 0) { printf("Cannot open GPIO controller export\n"); exit(1); }write(export, "909", 4);close(export);printf("GPIO controller export successfully\n");
//Modify GPIO controller directiondirection = open("/sys/class/gpio/gpio909/direction",O_WRONLY); if(direction < 0) { printf("Cannot open GPIO controller direction\n"); exit(1); }write(direction, "out", 4);close(direction);printf("GPIO controller direction changed to outputsuccessfully\n");
// Modify GPIO controller valuevalue = open("/sys/class/gpio/gpio909/value", O_RDWR); if(value < 0) { printf("Cannot open GPIO controller value\n"); exit(1); }
//Swap GPIO control value each 1 secondwhile (1) { sleep(1); write(value,"1", 2); printf("GPIO controller value changed to 1 successfully\n"); sleep(1); write(value,"0", 2); printf("GPIO controller value changed to 0 successfully\n"); }}3 axi gpio led实验该实验情况如下：
实验如下：代码如下：#include <stdio.h>#include <fcntl.h>#include <stdlib.h>#include <unistd.h>int main(){int led0;int led1;int led2;
//export GPIO controllerled0 = open("/sys/class/leds/led-ld0/brightness", O_WRONLY);led1 = open("/sys/class/leds/led-ld1/brightness", O_WRONLY);led2 = open("/sys/class/leds/led-ld2/brightness", O_WRONLY); if(led0 < 0 | led1 < 0 | led2 < 0) { printf("Cannot open GPIO controller export\n"); exit(1); } write(led0,"0", 2); write(led1,"0", 2); write(led2,"0", 2); //Swap GPIO control value each 1 secondwhile (1) { sleep(1); write(led0,"255", 4); sleep(1); write(led1,"255", 4); sleep(1); write(led2,"255", 4); printf("GPIO controller value changed to 1 successfully\n"); sleep(1); write(led0,"0", 2); sleep(1); write(led1,"0", 2); sleep(1); write(led2,"0", 2); printf("GPIO controller value changed to 0 successfully\n"); }}4 uart16550实验根据上述信息可知，串口的驱动字符名为ttyS1和ttyS2，因此实验现象如下：
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