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/* 四个GPIO以不同频率输出闪烁，创建四个线程，分别输出不同的频率 */
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include <sys/types.h>
#include <asm/hardware.h>
#include <asm-arm/arch-s3c2410/gpio.h>
pthread_t tid1,tid2,tid3,tid4;
unsigned char gpio_rd(int fd);
int gpio_wr(int fd,unsigned char data);
struct gpio
{
int fd;
int data;
int time;
};
void *led_func(struct gpio *tmp) //线程复用函数
{
struct gpio led_tmp;
led_tmp=*tmp;
while(1)
{
//sleep(1);
usleep(led_tmp.time);
ioctl(led_tmp.fd,GPIO_SET_PIN,led_tmp.data);
usleep(led_tmp.time);
ioctl(led_tmp.fd,GPIO_CLR_PIN,led_tmp.data);
}
pthread_exit(0);
}
int gpio_open(void) //打开文件 返回文件描述符
{
int fd;
if( (fd=open("/dev/gpf/0" ,O_RDWR))<0 )
{
perror("open gpio error");
exit(1);
}
return fd;
}
int gpio_set(int fd,unsigned char set_in,unsigned char set_out)//配置IO口的输入输出
{
printf("set in port ");
if( ioctl(fd,GPIO_SET_MULTI_PIN_IN,set_in)!=0 )
{
perror("gpio ioctl error");
exit(1);
}
printf("[ok] \n set out port ");
if( ioctl(fd,GPIO_SET_MULTI_PIN_OUT,set_out)!=0 )
{
perror("gpio ioctl error");
exit(1);
}
printf("[ok] \n");
return 0;
}
unsigned char gpio_rd(int fd) //IO口读
{
unsigned char buf=0;
if( read(fd,&buf,1)==-1 )
{
perror("read error");
exit(1);
}
return buf;
}
int gpio_wr(int fd,unsigned char data) //IO读
{
if( write(fd,&data,1)==-1 )
{
perror("write error");
exit(1);
}
return 0;
}
int main(void)
{
int fd;
char cmd[8];
struct gpio led;
fd=gpio_open();
gpio_set(fd,0x0f,0xf0); //配置输入输出口
led.fd=fd;
led.data=4;
led.time=100000;
pthread_create(&tid1,NULL,led_func,&led);//通过结构体传递多参数
usleep(20);
led.fd=fd;
led.data=5;
led.time=50000;
pthread_create(&tid2,NULL,led_func,&led); //函数冲入，实现不同频率同步输出
usleep(20);
led.fd=fd;
led.data=6;
led.time=200000;
pthread_create(&tid3,NULL,led_func,&led);
usleep(20);
led.fd=fd;
led.data=7;
led.time=250000;
pthread_create(&tid4,NULL,led_func,&led);
usleep(20);
while(1)
{
scanf("%s",cmd);
if( strcmp(cmd,"exit")==0 ) // 父进程控制推出
{
pthread_cancel(tid1);
break;
}
usleep(20);
}
pthread_join(tid1,NULL); //父进程推出后，所属线程消亡
printf("exit");
return 0;
}
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