Looks way to complicated for me. Look at Derek Molloy’s example:
https://github.com/derekmolloy/exploringBB/blob/master/extras/kernel/gpio_test/gpio_test.c <https://github.com/derekmolloy/exploringBB/blob/master/extras/kernel/gpio_test/gpio_test.c> Regards, John > On Feb 14, 2016, at 8:10 AM, Mihai Seba <ardelean...@gmail.com> wrote: > > 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! > > -- > For more options, visit http://beagleboard.org/discuss > <http://beagleboard.org/discuss> > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
