i.MX ProcessorsのトピックRe: MX25, GPT Interrupt

MX25, GPT Interrupt

erickang — Wed, 15 May 2013 12:25:27 GMT

Dear Freescale,
I have a question for GPT Interrupt.

For this, I configured the GPT Interrupt like as below,
- used GPT : GPT2
- Interrupt Period : 100usec
- Interrupt Pin : MX25_PIN_GPIO_D

So I expected that the interrupt pin will be toggled with 100usec period.
But the result was strange based on ISR.
- with ISR : Abnormal Operation
- without ISR : Normal Operation

Could you tell me what's the problem?

For your more understanding, I'll attach the modified/added files.
- Kernel
   . arch/arm/mach-mx25/clock.c
     : add GPT2 clock (survey "Eric" in the code)
- Driver
   . mx25_gpt_interrupt_driver.c
     : GPT Interrupt Test driver
     : GPT ISR in the code
       #if 1 // GPT Interrupt ISR - No.ISR = Normal / OK.ISR = Ab-normal
       /* GPT ISR register */
       setup_irq(irq, &mxc_timer_irq_kicc);
       #endif
- captured Wave
   . Normal : Normal-Without_GPT_ISR.jpg
   . Abnormal : Abnormal-With_GPT_ISR.jpg

Best Regards,
Eric.

Original Attachment has been moved to: clock.c.zip

Original Attachment has been moved to: mx25_gpt_interrupt_driver.c.zip

Re: MX25, GPT Interrupt

shaojun_wang — Mon, 17 Jun 2013 03:51:32 GMT

You can refer arch/arm/plat-mxc/time.c for the gpt interrupt setting.

GPTIR should be set to 0x1.

Please also try to use ipg_clk_32k as gpt clock source to test if the issue is still exist.

Re: MX25, GPT Interrupt

erickang — Thu, 04 Jul 2013 07:44:23 GMT

Dear Shaojun Wang,

I applied the gpt interrupt setting of arch/arm/plat-mxc/time.c,

but the result was the same.

And I applied the EPIT, but the result was the same.

Actually when I used the GPIO interrupt, the result was Success.

I don't know what's the problem.

Could you give me other guide?