this days i approch a promble that when using a structure in nios 10.1sp to operate pio,but i doesn't work at all. The details as flowing.
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#define PIO_LED_BASE 0x101000
i define a structure for pio like this.
typedef struct{
volatile unsigned long int DATA;
volatile unsigned long int DIRECTION;
volatile unsigned long int INTERRUPT_MASK;
volatile unsigned long int EDGE_CAPTURE;
}LED_REG;
void led_reg_write(void)
{
unsigned char i;
for(i = 0; i < 8; i += 1){
LED -> DATA = 1 << i;
usleep(2000000);
}
}
int main()
{
while(1)
led_reg_write();
}
my program is to shift the led one by one,but i doesn't work at all.
Is that a problem of the nios 10.1sp? Is there somebody met the same problem before?