头文件TestMstarGpio.h
///
#ifndef _MSTAR__GPIO_KLSDJFAJLKAJKAL_H_
#define _MSTAR__GPIO_KLSDJFAJLKAJKAL_H_ #define MSTAR_GPIO_MAJOR 224
#define MSTAR_GPIO_MINOR 0
#define Cmd_GPIO_Write 221
#define Cmd_GPIO_Read 222
#define Cmd_GPIO_DirectionOut 223
#define Cmd_GPIO_DirectionIn 224typedef struct _mstar_gpio_data_struct { int num;int value;}mstar_gpio_data_struct;
int OpenGpio();int WriteGpio(int fd,int num,int value);int ReadGpio(int fd,int num);int SetGpioIn(int fd,int num);
#endif/
源文件TestMstarGpio.c
///
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <sys/ioctl.h>
#include "MstarGpio.h"void HexPrintf(char * buf ,int len)
{int i;printf("\r\n");for(i=0;i<len;i++){printf("0x%02x ",*(buf+i));if(15==(i%16))printf("\r\n");}printf("\r\n");}
int OpenGpio()
{int fd=0;/*打开设备文件*/fd = open("/dev/MstarGpio",O_RDWR);if (fd < 0){printf("Open Dev Mem0 Error!\n");return -1;}return fd;
}
int WriteGpio(int fd,int num,int value)
{mstar_gpio_data_struct Mymstar_gpio_data_struct;Mymstar_gpio_data_struct.num=num;Mymstar_gpio_data_struct.value=value;if (ioctl(fd, Cmd_GPIO_Write, &Mymstar_gpio_data_struct) < 0){printf("Call cmd MEMDEV_IOCPRINT fail\n");return -1;}return 0;
}
int ReadGpio(int fd,int num)
{mstar_gpio_data_struct Mymstar_gpio_data_struct;Mymstar_gpio_data_struct.num=num;if (ioctl(fd, Cmd_GPIO_Read, &Mymstar_gpio_data_struct) < 0){printf("Call cmd MEMDEV_IOCPRINT fail\n");return -1;}return Mymstar_gpio_data_struct.value;
}
int SetGpioIn(int fd,int num)
{mstar_gpio_data_struct Mymstar_gpio_data_struct;Mymstar_gpio_data_struct.num=num;if (ioctl(fd, Cmd_GPIO_DirectionIn, &Mymstar_gpio_data_struct) < 0){printf("Call cmd MEMDEV_IOCPRINT fail\n");return -1;}return Mymstar_gpio_data_struct.value;
}
main(int argc,char *argv[])
{int num;int value;int i;int fd;int ret=0;if((3!=argc)&&(2!=argc)){printf("usage \r\n read demo: ./TestMstarGpio 62 \r\n write demo: ./TestMstarGpio 62 1 \r\n");return 0;}num=atoi(argv[1]);fd=OpenGpio();if(argc==3){printf("fd %d\r\n",fd);value=atoi(argv[2]);WriteGpio(fd,num,value);printf("WriteGpio %d\r\n",value);}if(argc==2){// SetGpioIn(fd,num);// while(1){ret=ReadGpio(fd,num);printf("ReadGpio %d\r\n",ret);// usleep(2000);}}close(fd);//printf("argc %d %d\r\n",argc,cycle);return 0;
}/
编译的Makefile
all:
arm-buildroot-linux-uclibcgnueabihf-gcc -o TestMstarGpio TestMstarGpio.c
# arm-linux-gnueabihf-gcc -o TestMstarGpio TestMstarGpio.c