6410之點燈驅動

寫乙個點led的驅動分為下面幾個步驟：

1.框架

2.完善硬體的操作

a.看原理圖

b.看6410手冊

c.寫**：

檢視6410原理圖led sch如下：

所以要操作的工作有：

1.設定gpm0 - gpm3為輸出引腳 

2.點燈或者滅燈，對gpmdat 進行操作即可。

3.使用ioremap和iounmap對實體地址進行對映和取消對映。

具體**如下：

#include #include #include #include #include #include #include struct class *first_dev_class;

struct device *first_dev;
volatile unsigned long *gpmcon = null;
volatile unsigned long *gpmdat = null;
static int first_drv_open(struct inode *inode, struct file *file) //裝置節點的相關操作函式
static int first_drv_read(struct file *filp, char __user *buff, 
size_t count, loff_t *offp)
ssize_t first_drv_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
else if(val == 0)
return sizeof(buf);
}static struct file_operations first_drv_fops = ;
int major;
static int __init first_drv_init(void)//入口函式
static void __exit first_drv_exit(void)
module_init(first_drv_init);//入口修飾函式
module_exit(first_drv_exit);
module_license("gpl"); //證書

#include #include int main(int argc , char **argv)

if(!strcmp(argv[1],"on"))else if(!strcmp(argv[1],"off"))
fd = open("/dev/shanl",o_rdwr); //開啟裝置節點/dev/shanl
if(fd < 0)
write(fd,&val,4);//向裝置節點做寫操作
return 0;
}

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