dear all:
how can i use gpio 31 and 61 for input/output?
i use the gpio funcions just like :
#define GPIO 61
static int __init hello_init(void)
{
int n,ret,i;
printk(KERN_ALERT "Hello, world!\n");
ret=gpio_direction_output(GPIO, 0);
if (ret<0)
{
printk("faild gpio set!\n");
return -1;
}
for (i=0;i<20000;i++)
{
gpio_set_value(GPIO, 0);
udelay(500);
gpio_set_value(GPIO, 1);
udelay(500);
}
return 0;
}
but i cann't find the signals by oscillograph,why?
2009-02-18
zuowenping
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