Help defining interrupts with MQX

JaimeR — Sat, 25 Apr 2009 23:36:56 GMT

Hi,
I am using GPT in order to detect falling edges with Input Capture. I have done a project without operating system and

interrupts are working fine, however, when I try to add a module into BPS to drive GPT and detect falling edges,

interrupts are not working.
Below is my initialize function simplified to manage only Timer Zero. I am using the same values for register as the

project working without OS. I am also installing interrupts using the functions provided for with MQX.
What could the problem be?
What am I missing?

uint_32 GPT_Initialize
(
//Número del timer
uint_8 tim_num, pointer isr
)
{ /* Body */
volatile PSP_INTERRUPT_TABLE_INDEX index;
VMCF5225_STRUCT_PTR reg_ptr = _PSP_GET_IPSBAR();

volatile GPT_REG_STRUCT_PTR gpt_reg_ptr;

   void     (_CODE_PTR_ result)(pointer);
   uint_32   return_code = GPT_OK;

   gpt_reg_ptr = (pointer)(&((VMCF5225_STRUCT_PTR)_PSP_GET_IPSBAR())->GPT);

   switch(tim_num)
   {
           gpt_reg_ptr->GPTSCR1 &= ~MCF_GPT_GPTSCR1_TFFCA;
              case(0):
                 index = MCF5225_INT_TIMA_C0F;
                    reg_ptr->GPIO.PTAPAR |= (MCF_GPIO_PTAPAR_PTAPAR0(1) );
                    gpt_reg_ptr->GPTDDR &= ~ MCF_GPT_GPTDDR_DDRT0;
                    gpt_reg_ptr->GPTIOS &= ~MCF_GPT_GPTIOS_IOS0;
                    gpt_reg_ptr->GPTSCR1 &= ~(MCF_GPT_GPTSCR1_TFFCA|MCF_GPT_GPTSCR1_GPTEN);
                    gpt_reg_ptr->GPTCTL2 |= MCF_GPT_GPTCTL2_EDG0A;
                    gpt_reg_ptr->GPTCTL2 &= MCF_GPT_GPTCTL2_EDG0B;
                    gpt_reg_ptr->GPTIE |= MCF_GPT_GPTIE_CI0;
                    gpt_reg_ptr->GPTSCR2 = MCF_GPT_GPTSCR2_PR(1);
                    reg_ptr->GPIO.PTAPAR = 0x00;
                    reg_ptr->GPIO.PTAPAR |= MCF_GPIO_PTAPAR_PTAPAR0(1);
                    if ( _mcf5225_int_init(MCF5225_INT_TIMA_C0F, GPT_C0F_INT_LEVEL, GPT_C0F_INT_SUBLEVEL, TRUE) != MQX_OK)
                    {
                       return (GPT_INT_ENABLE_FAILED);
                    }
                    gpt_reg_ptr->GPTFLG1 |= MCF_GPT_GPTFLG1_CF0;
                    gpt_reg_ptr->GPTFLG2 |= MCF_GPT_GPTFLG2_TOF;
                    gpt_reg_ptr->GPTSCR2 &= ~MCF_GPT_GPTSCR2_TCRE;
                    gpt_reg_ptr->GPTSCR1 |= MCF_GPT_GPTSCR1_GPTEN;
                    result = _int_install_isr (index, (void (_CODE_PTR_))isr, (pointer)gpt_reg_ptr);
                    if(result == NULL)
                    {
                         return_code = _task_get_error();
                    }
          default: break;
   }
    return return_code;
} /* Endbody */

Regards,

Jaime

Re: Help defining interrupts with MQX

PetrL — Tue, 28 Apr 2009 14:19:26 GMT

Hi,

I have noticed that you have mcf5225_int_init and _int_install_isr in wrong order.

First you should install isr - that means connect interrupt with service routine.

Then interrupt should be initialized - set int level, sublevel , mask/unmask.

PetrL

Re: Help defining interrupts with MQX

Ardoster — Sun, 13 Sep 2009 22:45:30 GMT

A perhaps very silly question: What's GPT? I haven't found it neither MQX User's Manual nor Reference Manual.

Thanks you.

Regards

Re: Help defining interrupts with MQX

PetrL — Mon, 14 Sep 2009 01:23:54 GMT

GPT is ColdFire peripheral module - General Purpose Timer. See chip reference manual.

MQX does not have driver for it, therefore you can not find it manual..

Regards,

PetrL

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