Watchdog for MCF52235 - Cannot turn it on

paynete — Sat, 16 Dec 2006 00:02:06 GMT

Working with ColdFire_Lite Tcp Stack. Having an issue with unresponsive TCP or general lockup. Thought I would enable watchdog.

Changed mcf5223_wtm_init in mcf5223_sysinit.c to turn on Watchdog.

void mcf5223_wtm_init(void)
{
/*
* Enable Software Watchdog Timer - Timing 2^23 * Bus Freq
*/
MCF_SCM_CWCR = MCF_SCM_CWCR_CWT(5) |
     MCF_SCM_CWCR_CWE  |
     MCF_SCM_CWCR_CWTA  |
     MCF_SCM_CWCR_CWTAVAL |
     MCF_SCM_CWCR_CWTIC  ;

MCF_INTC0_ICR8 = MCF_INTC_ICR_IL(2);
MCF_INTC0_IMRL &= ~(MCF_INTC_IMRL_MASK8);

MCF_SCM_CWSR = 0x55;
MCF_SCM_CWSR = 0xAA;

}

Tried without setting CWTA, CWTAVAL, & CWTIC also.

Added _watchdog_handler to mcf5223_vectors.s as .extern and to vector48:
.extern _watchdog_handler
vector48: .long _watchdog_handler //_irq_handler

Added watchdog_handler to Int_handlers.c to perform soft reset

__interrupt__
void watchdog_handler (void)
{
mcf5xxx_irq_disable();
MCF_CIM_RCR |= MCF_CIM_RCR_SOFTRST; //TEP Software Reset ***********************
}

Purposely did not service the CWSR on a periodic basis for test.

What am I doing wrong.

Re: Watchdog for MCF52235 - Cannot turn it on

paynete — Wed, 20 Dec 2006 00:48:31 GMT

Solved my own issue. I've not had much luck with receiving help from this forum in a timely manner . In case this helps someone else, here is what works for me.

This is the init from mcf5223_sysinit.c

void
mcf5223_wtm_init(void)
{
//
// Enable Software Watchdog Timer - Timing 2^23 * Bus Freq
//
// WatchDog Service Routine
MCF_SCM_CWSR = 0x55;
MCF_SCM_CWSR = 0xAA;
// Set Watchdog Timing Delay
// 6 = 2^27 * Bus Clock Frequency (60MHz) = 2.23 Seconds
MCF_SCM_CWCR = MCF_SCM_CWCR_CWT(6);
// Enable Watchdog
MCF_SCM_CWCR |= MCF_SCM_CWCR_CWE;
// WatchDog Service Routine
MCF_SCM_CWSR = 0x55;
MCF_SCM_CWSR = 0xAA;
// Wait to Hook ISR

Moved the ISR Hook to the init function of a FreeRTOS task for the project which executes much later:

//Hook Watchdog ISR to Interrupt
MCF_INTC0_ICR8 = MCF_INTC_ICR_IP(7) | MCF_INTC_ICR_IL(3);
MCF_INTC0_IMRL &= ~(MCF_INTC_IMRL_MASK8);
Csa_watchdog_is_ready = 1;

Serviced the Watchdog by waking a task after 1 sec within the system clock ISR:

__declspec(interrupt)
void
timer_isr()
{
++timer_ticks;

  if (++timerct >= INTS_PER_CTICK)
  {
     cticks++;
     if (Csa_watchdog_is_ready)
     {
       if(!(--Csa_wdog_timer_cnt))
       {
           Csa_wdog_timer_cnt = CSA_WDOG_CNT;
         CsaProcessList |= CSA_WATCHDOG_PROCESS;
       TK_WAKE(&to_csa);
       }
     }

The Task that services the ISR:
void csa_watchdog_process(void)
{
MCF_SCM_CWSR = 0x55;
MCF_SCM_CWSR = 0xAA;
//printf("watchdog ");
CsaProcessList &= ~CSA_WATCHDOG_PROCESS;
}

ColdFire/68K Microcontrollers and ProcessorsのトピックRe: Watchdog for MCF52235 - Cannot turn it on

Watchdog for MCF52235 - Cannot turn it on

Re: Watchdog for MCF52235 - Cannot turn it on