Zynq-7000、FMQL45T900的GPIO控制 c语言代码

#include <stdlib.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <errno.h> //arm-linux-gnueabihf-gcc gpio_test_input.c -o gpio_test_input #define ERROR 0x01 #define IN 0x01 #define OUT 0x02 #define TEST_1_PIN_NUM 434// FMQL45T900 EMIO8 -> gpiochip434 #define TEST_2_PIN_NUM 916// ZYNQ-7000 MIO10 -> gpio916 #define GPIO_DEBUG #ifdef GPIO_DEBUG #define dbg_info(format, args...) printf("%d:"format, __LINE__, ##args) #else #define dbg_info(format, args...) #endif #define dbg_err(format, args...) printf("%d:"format, __LINE__, ##args) struct pin_mesg{ int pin; unsigned char inout_flags; }; static int gpio_unexport(struct pin_mesg* mesg); static int gpio_read(struct pin_mesg* mesg, char* value); static int gpio_direction(struct pin_mesg* mesg); static int gpio_export(struct pin_mesg* mesg); int main(int argc, char *argv[]){ char value; struct pin_mesg test_pin_mesg; test_pin_mesg.pin = TEST_1_PIN_NUM; test_pin_mesg.inout_flags = IN; gpio_export(&test_pin_mesg);//生成gpio节点 gpio_direction(&test_pin_mesg);//设置方向 gpio_read(&test_pin_mesg, &value);//读入value， return 0; } static int gpio_export(struct pin_mesg* mesg){ char name[4]; int fd,len; fd = open("/sys/class/gpio/export", O_WRONLY); if (fd < 0) { perror("open export"); return(-1); } len = sprintf(name, "%d", mesg->pin); dbg_info("name = gpio%s\n",name); if (write(fd, name, sizeof(name)) < 0) { perror("write export"); return -1; } close(fd); return 0; } static int gpio_direction(struct pin_mesg* mesg){ char path[64]; int fd,res; char *dir; if(mesg->inout_flags & IN) dir = "in"; if(mesg->inout_flags & OUT) dir = "out"; sprintf(path,"/sys/class/gpio/gpio%d/direction", mesg->pin); dbg_info("direction path: %s,direction = %s\n", path, dir); fd = open(path, O_WRONLY); if (fd < 0) { perror("open direction"); return -1; } res = write(fd, dir, sizeof(dir)); if (res <= 0) { perror("write direction"); return -1; } close(fd); return 0; } static int gpio_read(struct pin_mesg* mesg, char* value){ char path[64]; char value_str[4]; int fd; sprintf(path, "/sys/class/gpio/gpio%d/value", mesg->pin); dbg_info("value path: %s\n", path); fd = open(path, O_RDONLY); if (fd < 0) { perror("open value"); return -1; } if (read(fd, value_str, 3) < 0) { perror("read value"); return -1; } dbg_info("read value: %s\n", value_str); * value = (atoi(value_str)); close(fd); return 0; } static int gpio_unexport(struct pin_mesg* mesg) { char name[4]; int len; int fd; fd = open("/sys/class/gpio/unexport", O_WRONLY); if (fd < 0) { perror("open unexport"); return -1; } len = sprintf(name, "%d", mesg->pin); dbg_info("name = gpio%s\n",name); if (write(fd, name, len) < 0) { perror("write unexport"); return -1; } close(fd); return 0; }