GPH3_2 & GPH3_4的gpio_direction_input輸出一值為零
本帖最后由 s1005056 于 2014-5-13 16:59 编辑版大以及各位版友好，
目前想練習做兩個按鍵，接key 6x6的3.3V以及KP_ROW1(GPH3_5)，然後利用KP_ROW2(GPH3_2)跟KP_ROW4(GPH3_4)讀取管腳電平。在參考LED驅動範本後，實作如下的程式碼：
#include <linux/miscdevice.h>
#include <linux/input.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <mach/map.h>
#include <mach/gpio.h>
//#include <mach/gpio-bank.h>
#include <mach/regs-gpio.h>
#include <plat/gpio-core.h>
#include <plat/gpio-cfg.h>
#include <plat/gpio-cfg-helpers.h>
#define DEVICE_NAME "button"
#define IOCTL_GPIO_READ_STATUS 1
/*assign pins */
static unsigned long gpio_table [] =
{
S5PV210_GPH3(5), /* high voltage output*/
S5PV210_GPH3(2), /* input */
S5PV210_GPH3(4), /* input */
};
static unsigned int gpio_cfg_table [] =
{
S3C_GPIO_SFN(1),
S3C_GPIO_SFN(0),
S3C_GPIO_SFN(0),
};
static long tq210_btn_ioctl(
struct file *file,
unsigned int cmd,
unsigned long arg)
{
arg -= 1;
if (arg > sizeof(gpio_table)/sizeof(unsigned long))
{
return -EINVAL;
}
switch(cmd)
{
case IOCTL_GPIO_READ_STATUS:
printk(KERN_INFO "pin[%ld] status= %d\n", arg, gpio_direction_input(gpio_table));
return 0;
default:
return -EINVAL;
}
}
static int tq210_btn_open(struct inode *inode, struct file *file)
{
int i;
int err;
/* high voltage supply */
err = gpio_request(gpio_table, "GPH3_5");
if(err)
{
printk(KERN_ERR "failed to request GPH3_5 pin and name\n");
return err;
}
/* set as input pin */
err = gpio_request(gpio_table, "GPH3_2");
if(err)
{
printk(KERN_ERR "failed to request GPH3_2 pin and name\n");
return err;
}
err = gpio_request(gpio_table, "GPH3_4");
if(err)
{
printk(KERN_ERR "failed to request GPH3_4 pin and name\n");
return err;
}
printk(KERN_INFO " buttons opened\n");
for (i = 0; i < sizeof(gpio_table)/sizeof(unsigned long); i++)
{
s3c_gpio_cfgpin(gpio_table, gpio_cfg_table);
}
return 0;
}
static int tq210_btn_close(struct inode *inode, struct file *file)
{
int i;
for (i = 0; i < sizeof(gpio_table)/sizeof(unsigned long); i++)
{
gpio_free(gpio_table);
}
printk(KERN_INFO "TQ210 BTNs driver successfully close\n");
return 0;
}
static struct file_operations dev_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = tq210_btn_ioctl,
.open = tq210_btn_open,
// .read = tq210_btn_read,
.release = tq210_btn_close,
};
static struct miscdevice misc_btn = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &dev_fops,
};
static int __init button_init(void){
int ret;
ret = misc_register(&misc_btn);
if(ret < 0)
{
}else{
printk(KERN_INFO "TQ210 buttons driver successfully probed\n");
}
return ret;
}
static void __exit button_exit(void)
{
misc_deregister(&misc_btn);
int i;
for (i = 0; i < sizeof(gpio_table)/sizeof(unsigned long); i++)
{
gpio_free(gpio_table);
}
printk(KERN_INFO "TQ210 buttons driver successfully exit\n");
}
module_init(button_init);
module_exit(button_exit);
MODULE_LICENSE("GPL");
應用程式則如下：
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <asm/types.h>
#include <linux/fb.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/poll.h>
#define DEV_FILE_NAME "/dev/button" //驱动提供
#define IOCTL_GPIO_READ_STATUS 1 //驱动提供,表示亮
int main(){
int devfd;
int i,err;
devfd = open(DEV_FILE_NAME,O_RDWR);
if(devfd < 0)
{
printf("can't open dev (%s)",DEV_FILE_NAME);
return 0;
}
for(i=0;i<10;++i)
{
err = ioctl(devfd,IOCTL_GPIO_READ_STATUS,1);
if(err<0)
printf("GPIO_READ GPH3(2) faild! (%d)\n",err);
sleep(1); //休眠1S
err = ioctl(devfd,IOCTL_GPIO_READ_STATUS,2);
if(err<0)
printf("GPIO_READ GPH3(4) faild! (%d)\n",err);
sleep(1); //休眠1S
}
close(devfd);//关闭设备。对应驱动中的tq210_gpio_close
return 0;
}
但是在ternimal中的輸出都一直顯示為0，如下圖：
看了半天還是不知道哪裏出錯了，還請版上各位高手指點! 謝謝!{:5_349:}
煩請管理員刪掉這篇帖子，已經沒事了，感謝。
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