[Ltib] RE: P1 interrupt issue

[Amit Hergass]

Hi Kevin,

 

Thanks for the quick response.

I am using kernel 2.6.34.

The code is running in a kernel module.

A snippet of the Probe routine is shown below as well.

 

 

 

 

static irqreturn_t P0_P1_GPIO_ISR(int irq, void *dummy)

{

   static int blink=0;

   uint32_t intDef;

  

      blink = 1 - blink;

      if (blink == 0)

      {

         //Send Sync pulse

          gpio_set_value(DGEM_SYNC_PULSE, (int) 1);

      }

      else

      {

          gpio_set_value(DGEM_SYNC_PULSE, (int) 0);

      }

     return IRQ_HANDLED;   

}

 

 

From the module probe  routine:

 

static int __devinit DGM_spi_probe(struct spi_device *spi)

{

.

.

 

#define ZERO_X_INT_A1                  LPC32XX_GPIO(LPC32XX_GPIO_P1_GRP, 23)

#define ZERO_X_INT_A2                  LPC32XX_GPIO(LPC32XX_GPIO_P1_GRP, 22)

#define ZERO_X_INT_A3                  LPC32XX_GPIO(LPC32XX_GPIO_P1_GRP, 21)

#define ZERO_X_INT_B1                  LPC32XX_GPIO(LPC32XX_GPIO_P1_GRP, 20)

#define ZERO_X_INT_B2                  LPC32XX_GPIO(LPC32XX_GPIO_P1_GRP, 19)

#define ZERO_X_INT_B3                  LPC32XX_GPIO(LPC32XX_GPIO_P1_GRP, 18)

#define NPOWER_FAIL                     LPC32XX_GPIO(LPC32XX_GPIO_P0_GRP, 5) //

#define DGEM_SYNC_PULSE        LPC32XX_GPIO(LPC32XX_GPO_P3_GRP, 18)

 

 

   //Allocate Interrupts input pins for zero crossing  on P1 pins 18-23

   if (gpio_request(ZERO_X_INT_A1, "Meter 1 Zero cross Int"))

                                printk(KERN_ERR "Error requesting gpio %u", ZERO_X_INT_A1);

                else if (gpio_direction_input(ZERO_X_INT_A1))

                                printk(KERN_ERR "Error setting gpio %u to output",ZERO_X_INT_A1);

                       

                if (gpio_request(ZERO_X_INT_A2, "Meter 2 Zero cross Int"))

                                printk(KERN_ERR "Error requesting gpio %u",ZERO_X_INT_A2);

                else if (gpio_direction_input(ZERO_X_INT_A2))

                                printk(KERN_ERR "Error setting gpio %u to output",ZERO_X_INT_A2);

  

   if (gpio_request(ZERO_X_INT_A3, "Meter 3 Zero cross Int"))

                                printk(KERN_ERR "Error requesting gpio %u",ZERO_X_INT_A3);

                else if (gpio_direction_input(ZERO_X_INT_A3))

                                printk(KERN_ERR "Error setting gpio %u to output",ZERO_X_INT_A3);

           

if (gpio_request(ZERO_X_INT_B1, "Meter 4 Zero cross Int"))

                                printk(KERN_ERR "Error requesting gpio %u",        ZERO_X_INT_B1);

                else if (gpio_direction_input(ZERO_X_INT_B1))

                                printk(KERN_ERR "Error setting gpio %u to output",        ZERO_X_INT_B1);

                       

                if (gpio_request(ZERO_X_INT_B2, "Meter 5 Zero cross Int"))

                                printk(KERN_ERR "Error requesting gpio %u",     ZERO_X_INT_B2);

                else if (gpio_direction_input(ZERO_X_INT_B2))

                printk(KERN_ERR "Error setting gpio %u to output",        ZERO_X_INT_B2);

  

   if (gpio_request(ZERO_X_INT_B3, "Meter 6 Zero cross Int"))

                                printk(KERN_ERR "Error requesting gpio %u",ZERO_X_INT_B3);

                else if (gpio_direction_input(ZERO_X_INT_B3))

                                printk(KERN_ERR "Error setting gpio %u to output",ZERO_X_INT_B3);

           

   if (gpio_request(NPOWER_FAIL, "Mains power fail Int"))

                                printk(KERN_ERR "Error requesting gpio %u", NPOWER_FAIL);

                else if (gpio_direction_input(NPOWER_FAIL))

                                printk(KERN_ERR "Error setting gpio %u to output",NPOWER_FAIL);

.

.

.

.

   // set int polarity of pn pins to rising or falling edge:

   set_irq_type(IRQ_P0_P1_IRQ,IRQ_TYPE_EDGE_FALLING);

 

   // Enable  ZERO_X_INT from all channels  

//    __raw_writel(0xFC000020, P0_INTR_ER_IO ); // This is the correct configuration but it does not work

      __raw_writel(0xE0000000, P0_INTR_ER_IO ); // Enabling the three first interrupts only

 

   retp=request_irq(IRQ_P0_P1_IRQ,P0_P1_GPIO_ISR,0,"P0_P1_GPIO_ISR",NULL); // chapter 5, section 4.3 page 90 bit 8 user manual

   if(retp<0) 

      printk("request_irq ZERO Crossing failed! \n");

   else

      lpc32xx_unmask_irq(IRQ_P0_P1_IRQ);

.

.

}

 

 

Thanks,

Amit

 

 

From: Kevin Wells [mailto:address@hidden
Sent: Wednesday, 13 October 2010 3:18 AM
To: Amit Hergass; address@hidden
Cc: Peter von Konigsmark
Subject: RE: P1 interrupt issue

 

Hi Amit,

 

Please post or send over the code snippet for setting up and handling the IRQs. Also,

which version of the kernel are you using?

 

Kevin

 

From: Amit Hergass [mailto:address@hidden
Sent: Monday, October 11, 2010 8:08 PM
To: address@hidden; Kevin Wells
Cc: Peter von Konigsmark
Subject: P1 interrupt issue

 

Hi Kevin,

 

I am working on handling six interrupts sourced by Port-1 pins 18-23.

The interrupts are configured as Falling Edge.

The interrupts are generated by a 50% duty cycle square wave signals on those pins.

These signals starts one after the other and have the same frequency (they never occur at the same time).

I can control the generation of these signals.

 

The interrupt is successfully triggered if I generate the wave on a single channel (P1.23) , but when I add a wave on another pin (P1.22),  no interrupt triggered at all.

I have configured the correct activity type using “set_irq_type” API, and verified it in the registers.

 

 

Blow are some of the registers configuration read from the MCU:

Reg Address |  Value

40008000   -> 3015a203

40010000   -> 02000100

40008004   -> 00080000

40010004   -> 607b66c4

4000800c   -> 3ff0efe0

4001000c   -> 821810c0

40008010   -> 00000000

40010010   -> 02000100

40008014   -> c0000000

40010014   -> 00000000

40028138   -> 00ff8000

 

Thanks,

Amit Hergass

Senior Software Engineer

Genesys Electronics Design

 

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