147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
#ifndef __RK_PCBA_TEST_LED_H_
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#define __RK_PCBA_TEST_LED_H_
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#include <stdio.h>
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#include <stdlib.h>
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//error相关头文件
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#include <string.h>
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#include <errno.h>
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//access所需头文件
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#include <unistd.h>
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//open()相关头文件
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#define LED_BRIGHTNESS_FILE "/sys/class/leds/led%d/brightness"
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#define LED_NUM 36
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//* 定义LED开关
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#define LED_ON "128"
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#define LED_OFF "0"
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#define AUDIO_PATH "/data/cfg/rk_pcba_test"
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//#define PCBA_TEST_PATH "/data/cfg/rk_pcba_test"
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int write_int(char const* path,char const* value);
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int light_up_led_red(void);
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int light_up_led_green(void);
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int light_up_led_blue(void);
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/*亮红灯1s，然后熄灭*/
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int light_up_led_red(void)
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{
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char buf[128];
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int led_num;
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for(led_num=2;led_num<=LED_NUM;)
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{
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sprintf(buf,LED_BRIGHTNESS_FILE,led_num);
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write_int(buf,LED_ON);
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led_num = led_num+3;
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}
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sleep(1); //暂停1秒
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for(led_num=2;led_num<=LED_NUM;)
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{
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sprintf(buf,LED_BRIGHTNESS_FILE,led_num);
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write_int(buf,LED_OFF);
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led_num = led_num+3;
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}
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return 0;
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}
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/*亮绿灯1s，然后熄灭*/
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int light_up_led_green(void)
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{
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char buf[128];
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int led_num;
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for(led_num=1;led_num<=LED_NUM;)
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{
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sprintf(buf,LED_BRIGHTNESS_FILE,led_num);
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write_int(buf,LED_ON);
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led_num = led_num+3;
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}
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sleep(1); //暂停1秒
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for(led_num=1;led_num<=LED_NUM;)
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{
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sprintf(buf,LED_BRIGHTNESS_FILE,led_num);
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write_int(buf,LED_OFF);
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led_num = led_num+3;
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}
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return 0;
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}
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/*亮绿灯1s，然后熄灭*/
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int light_up_led_blue(void)
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{
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char buf[128];
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int led_num;
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for(led_num=3;led_num<=LED_NUM;)
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{
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sprintf(buf,LED_BRIGHTNESS_FILE,led_num);
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write_int(buf,LED_ON);
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led_num = led_num+3;
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}
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sleep(1); //暂停1秒
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for(led_num=3;led_num<=LED_NUM;)
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{
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sprintf(buf,LED_BRIGHTNESS_FILE,led_num);
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write_int(buf,LED_OFF);
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led_num = led_num+3;
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}
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return 0;
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}
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//打开LED亮度文件路径，并写入亮度值0-255
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int write_int(char const* path,char const* value)
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{
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int fd;
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char read_buffer[64],write_buffer[64]; //读缓存数据
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ssize_t length_r,length_w; //读写数据长度
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static int already_warned = 0;
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//1、打开文件亮度调节文件结点
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fd = open(path, O_RDWR|O_NOCTTY|O_NDELAY);
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if (fd >= 0)
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{
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char buffer[128];
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int bytes;
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length_r = read(fd, buffer, 64);
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printf("The current value of %s is : %d\n",path,atoi(buffer)); //打印读取的字节数与内容
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if (!memcmp(buffer,value,length_r)) //don't need to set value, because the value is same with the target
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{
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close(fd);
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return 0;
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}
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bytes = strlen(value)+1; //+1是多一个字符串结束符 '\0'
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length_w = write(fd, value, bytes);
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printf("%d bytes is wrote to node %s, the current value is %s\n",length_w,path,value);
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close(fd);
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return length_w == -1 ? -1 : 0;
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}
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else
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{
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fprintf(stderr,"can't open led driver file,%s\n",path);
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if (already_warned == 0)
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{
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fprintf(stderr,"write_int failed to open led driver %s\n", path);
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already_warned = 1;
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}
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return -1;
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}
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}
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#endif // RK_PCBA_TEST_LED_H_INCLUDED
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