/sys/class/gpio/export this driver file i have used.
but this control only one bit. so, i try to 8bit control like this
#include "bb_gpio.h"
#include <stdio.h>
#include <sys/time.h>
//#include <string.h>
void main(void)
{
gpio_export(p9_11); gpio_export(p9_12);
gpio_export(p9_13); gpio_export(p9_14);
gpio_export(p9_15); gpio_export(p9_16);
gpio_export(p9_17); gpio_export(p9_18);
gpio_direction(p9_11,out); gpio_direction(p9_12,out);
gpio_direction(p9_13,out); gpio_direction(p9_14,out);
gpio_direction(p9_15,out); gpio_direction(p9_16,out);
gpio_direction(p9_17,out); gpio_direction(p9_18,out);
while(1){
pin_write(p9_11,1); pin_write(p9_12,1);
pin_write(p9_13,1); pin_write(p9_14,1);
pin_write(p9_15,1); pin_write(p9_16,1);
pin_write(p9_17,1); pin_write(p9_18,1);
sleep(1);
pin_write(p9_11,0); pin_wirte(p9_12,0);
pin_write(p9_13,0); pin_wirte(p9_14,0);
pin_write(p9_15,0); pin_wirte(p9_16,0);
pin_write(p9_17,0); pin_wirte(p9_18,0);
sleep(1);
};
}
================#include "bb_gpio.h"================
#ifndef BB_GPIO_H_
#define BB_GPIO_H_
#include <stdio.h>
#include <string.h>
/********************************************
* BB_GPIO headerfile
* This file only used to gpio control
* other feature using device-tree-overlay
* when using GPIO, the pin work to MODE7
*=====formula======
* GPIO N1[N2]
* gpio_number = (32 x N1) + N2
*==================
*********************************************/
#define out 1
#define in 0
#define export_PATH "/sys/class/gpio/export"
#define value_PATH "/sys/class/gpio/gpio%d/value"
#define direction_PATH "/sys/class/gpio/gpio%d/direction"
#define unexport_PATH "/sys/class/gpio/unexport"
//*********************P9***********************
#define p9_11 30
#define p9_12 60
#define p9_13 31
#define p9_14 50
#define p9_15 48
#define p9_16 51
#define p9_17 5
#define p9_18 4
//#define p9_19 13
//#define p9_20 12
#define p9_21 3
#define P9_22 2
#define p9_23 49
#define p9_24 15
#define p9_25 117
#define p9_26 14
#define p9_27 115
//#define p9_28 113
//#define p9_29 111
#define p9_30 112
//#define p9_31 110
#define p9_41 20
//#define p9_41 116
//#define p9_42 114
#define p9_42 7
//*********************************************
//*********************P8***********************
//*********************************************
//******************function*********************
int gpio_export(int);
int gpio_unexport(int);
int gpio_direction(int, int);
int pin_write(int, int);
int pin_read(int);
//***********************************************
#endif /*BB_GPIO_*/
int gpio_export(int gpio_number)
{
FILE* fp=0;
if((fp = fopen(export_PATH,"w"))==NULL){
printf("Cannot open export file(>>%s).\n", export_PATH);
return -1;
}
fprintf(fp,"%d",gpio_number);
fclose(fp);
}
int gpio_unexport(int gpio_number)
{
FILE* fp;
if((fp = fopen(unexport_PATH,"w"))==NULL){
printf("Cannot open unexport file(>>%s).\n", unexport_PATH);
return -1;
}
fprintf(fp,"%d",gpio_number);
fclose(fp);
}
int gpio_direction(int gpio_number,int direction)
{
FILE* fp;
char set_value[4]={0};
char dir_path[50]={0};
sprintf(dir_path, direction_PATH, gpio_number);
if((fp = fopen(dir_path,"w"))==NULL){
printf("Cannot open direction file(>>%s).\n",dir_path);
return -1;
}
rewind(fp);
if(direction == out){
strcpy(set_value,"out");
fwrite(&set_value,sizeof(char),3,fp);
fclose(fp);
} else if(direction == in){
strcpy(set_value,"in");
fwrite(&set_value,sizeof(char),2,fp);
fclose(fp);
} else{
printf("invalue pin mode(%d)\n",direction);
return -1;
}
fclose(fp);
return 1;
}
int pin_write(int gpio_number,int value)
{
FILE* fp;
char val_path[50]={0};
char set_value[2]={0};
sprintf(val_path, value_PATH, gpio_number);
if((fp = fopen(val_path,"w"))==NULL){
printf("Cannot open value file(>>%s).\n",val_path);
return -1;
}
rewind(fp);
if(value == 1){
strcpy(set_value,"1");
}
else if(value == 0){
strcpy(set_value,"0");
}
else {
printf("invalid value pin(%d)(%d)\n", gpio_number, value);
return -1;
}
fwrite(&set_value, sizeof(char), 1, fp);
fclose(fp);
return 0;
}
int pin_read(int gpio_number)
{
FILE* fp;
int value=0;
char val_path[50]={0};
sprintf(val_path, value_PATH, gpio_number);
if((fp = fopen(val_path,"r"))==NULL){
printf("Cannot open value file(>>%s).\n",val_path);
return -1;
}
rewind(fp);
value = fgetc(fp) - '0';
fclose(fp);
return value;
}
but compile error...
root@beaglebone:/home/debian/workspace/sources/gpio_control# \
> gcc -o led_blink led_blink.c
/tmp/ccfrwmlk.o: In function `main':
led_blink.c:(.text+0x5c8): undefined reference to `pin_wirte'
led_blink.c:(.text+0x5e0): undefined reference to `pin_wirte'
led_blink.c:(.text+0x5f8): undefined reference to `pin_wirte'
led_blink.c:(.text+0x610): undefined reference to `pin_wirte'
collect2: ld returned 1 exit status
root@beaglebone:/home/debian/workspace/sources/gpio_control#
i don't know why .. help please
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#include "bb_gpio.h"
#include <stdio.h>
#include <sys/time.h>
//#include <string.h>
void main(void)
{
gpio_export(p9_11); gpio_export(p9_12);
gpio_export(p9_13); gpio_export(p9_14);
gpio_export(p9_15); gpio_export(p9_16);
gpio_export(p9_17); gpio_export(p9_18);
gpio_direction(p9_11,out); gpio_direction(p9_12,out);
gpio_direction(p9_13,out); gpio_direction(p9_14,out);
gpio_direction(p9_15,out); gpio_direction(p9_16,out);
gpio_direction(p9_17,out); gpio_direction(p9_18,out);
while(1){
pin_write(p9_11,1); pin_write(p9_12,1);
pin_write(p9_13,1); pin_write(p9_14,1);
pin_write(p9_15,1); pin_write(p9_16,1);
pin_write(p9_17,1); pin_write(p9_18,1);
sleep(1);
pin_write(p9_11,0); pin_wirte(p9_12,0);
pin_write(p9_13,0); pin_wirte(p9_14,0);
pin_write(p9_15,0); pin_wirte(p9_16,0);
pin_write(p9_17,0); pin_wirte(p9_18,0);
sleep(1);
};
}
#ifndef BB_GPIO_H_
#define BB_GPIO_H_
#include <stdio.h>
#include <string.h>
/********************************************
* BB_GPIO headerfile
* This file only used to gpio control
* other feature using device-tree-overlay
* when using GPIO, the pin work to MODE7
*=====formula======
* GPIO N1[N2]
* gpio_number = (32 x N1) + N2
*==================
*********************************************/
#define out 1
#define in 0
#define export_PATH "/sys/class/gpio/export"
#define value_PATH "/sys/class/gpio/gpio%d/value"
#define direction_PATH "/sys/class/gpio/gpio%d/direction"
#define unexport_PATH "/sys/class/gpio/unexport"
//*********************P9***********************
#define p9_11 30
#define p9_12 60
#define p9_13 31
#define p9_14 50
#define p9_15 48
#define p9_16 51
#define p9_17 5
#define p9_18 4
//#define p9_19 13
//#define p9_20 12
#define p9_21 3
#define P9_22 2
#define p9_23 49
#define p9_24 15
#define p9_25 117
#define p9_26 14
#define p9_27 115
//#define p9_28 113
//#define p9_29 111
#define p9_30 112
//#define p9_31 110
#define p9_41 20
//#define p9_41 116
//#define p9_42 114
#define p9_42 7
//*********************************************
//*********************P8***********************
//*********************************************
//******************function*********************
int gpio_export(int);
int gpio_unexport(int);
int gpio_direction(int, int);
int pin_write(int, int);
int pin_read(int);
//***********************************************
#endif /*BB_GPIO_*/
int gpio_export(int gpio_number)
{
FILE* fp=0;
if((fp = fopen(export_PATH,"w"))==NULL){
printf("Cannot open export file(>>%s).\n", export_PATH);
return -1;
}
fprintf(fp,"%d",gpio_number);
fclose(fp);
}
int gpio_unexport(int gpio_number)
{
FILE* fp;
if((fp = fopen(unexport_PATH,"w"))==NULL){
printf("Cannot open unexport file(>>%s).\n", unexport_PATH);
return -1;
}
fprintf(fp,"%d",gpio_number);
fclose(fp);
}
int gpio_direction(int gpio_number,int direction)
{
FILE* fp;
char set_value[4]={0};
char dir_path[50]={0};
sprintf(dir_path, direction_PATH, gpio_number);
if((fp = fopen(dir_path,"w"))==NULL){
printf("Cannot open direction file(>>%s).\n",dir_path);
return -1;
}
rewind(fp);
if(direction == out){
strcpy(set_value,"out");
fwrite(&set_value,sizeof(char),3,fp);
fclose(fp);
} else if(direction == in){
strcpy(set_value,"in");
fwrite(&set_value,sizeof(char),2,fp);
fclose(fp);
} else{
printf("invalue pin mode(%d)\n",direction);
return -1;
}
fclose(fp);
return 1;
}
int pin_write(int gpio_number,int value)
{
FILE* fp;
char val_path[50]={0};
char set_value[2]={0};
sprintf(val_path, value_PATH, gpio_number);
if((fp = fopen(val_path,"w"))==NULL){
printf("Cannot open value file(>>%s).\n",val_path);
return -1;
}
rewind(fp);
if(value == 1){
strcpy(set_value,"1");
}
else if(value == 0){
strcpy(set_value,"0");
}
else {
printf("invalid value pin(%d)(%d)\n", gpio_number, value);
return -1;
}
fwrite(&set_value, sizeof(char), 1, fp);
fclose(fp);
return 0;
}
int pin_read(int gpio_number)
{
FILE* fp;
int value=0;
char val_path[50]={0};
sprintf(val_path, value_PATH, gpio_number);
if((fp = fopen(val_path,"r"))==NULL){
printf("Cannot open value file(>>%s).\n",val_path);
return -1;
}
rewind(fp);
value = fgetc(fp) - '0';
fclose(fp);
return value;
}
