Hi guys,
I tried to write a GPIO driver for my Beaglebone Black but I'm stuck at
probing for interrupts.
I have the next code for probing the interrupt:
static void
kernel_probe_interrupt(void)
{
u8 count=0;
volatile u32 *memory_Ptr=NULL;
while(bbb_irq<0 && count<5){
unsigned long mask;
mask=probe_irq_on();
memory_Ptr=(u32*)(gpioreg_map(ioctl_buffer.gpio_group)|GPIO_IRQWAKEN_0);/*calculate
address of GPIO_IRQSTATUS_SET_0*/
*memory_Ptr=0xFFFFFFFF-ioctl_buffer.write_buffer;/*Enable interrupt. Value
from write buffer will be 1<<PIN_NUMBER*/
wmb();
*memory_Ptr=ioctl_buffer.write_buffer;/*Enable interrupt. Value from write
buffer will be 1<<PIN_NUMBER*/
wmb();
memory_Ptr=(u32*)(gpioreg_map(ioctl_buffer.gpio_group)|GPIO_IRQWAKEN_1);/*calculate
address of GPIO_IRQSTATUS_SET_0*/
*memory_Ptr=0xFFFFFFFF-ioctl_buffer.write_buffer;/*Enable interrupt. Value
from write buffer will be 1<<PIN_NUMBER*/
wmb();
*memory_Ptr=ioctl_buffer.write_buffer;/*Enable interrupt. Value from write
buffer will be 1<<PIN_NUMBER*/
wmb();
//
memory_Ptr=(u32*)(gpioreg_map(ioctl_buffer.gpio_group)|GPIO_IRQSTATUS_SET_0);/*calculate
address of GPIO_IRQSTATUS_SET_0*/
// *memory_Ptr=ioctl_buffer.write_buffer;/*Enable interrupt. Value from
write buffer will be 1<<PIN_NUMBER*/
// wmb();
//
memory_Ptr=(u32*)(gpioreg_map(ioctl_buffer.gpio_group)|GPIO_IRQSTATUS_SET_1);/*calculate
address of GPIO_IRQSTATUS_SET_1*/
// *memory_Ptr=ioctl_buffer.write_buffer;/*Enable interrupt. Value from
write buffer will be 1<<PIN_NUMBER*/
// wmb();
udelay(5);/*wait some time*/
count++;
bbb_irq = probe_irq_off(mask);
if (bbb_irq == 0) { /* none of them? */
printk( KERN_ERR,"%s: no irq reported by probe\n",DEVICE_NAME);
bbb_irq=-1;
}
}
if(bbb_irq==-1){
printk( KERN_ERR,"%s: no irq reported by probe after %d
attempts\n",DEVICE_NAME,count);
}
}
The problem is that always probe_irq_off returns 0. Maybe I didn't
understand the probe_irq_off function or the registers for GPIO interrupt.
I tried to probe by setting a bit in GPIO_IRQWAKEN_0 & GPIO_IRQWAKEN_1, I
also tried to set a bit in GPIO_IRQSTATUS_SET_0 and GPIO_IRQSTATUS_SET_1
but everytime, probe_irq_off returns 0. Can someone help me? I just want to
learn something.
Almost forgot, ioctl_buffer.gpio_group is the address of GPIO group (
GPIO0, GPIO1, GPIO2, GPIO3) and gpioreg_map() returns the address for each
group. ioctl_buffer.write_buffer stores the bit that I want to set.
Thanks a lot!
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