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Sorry,but __disable_irq() does nothing?

Posted by francis wang on July 6, 2009
In the FreeRTOS ARM7_LPC2129_Keil_RVDS port, we use

#define portDISABLE_INTERRUPTS()__disable_irq()
#define portENABLE_INTERRUPTS()__enable_irq()

but a fact is that __disable_irq() and __enable_irq() can not be called from the user mode.It seems they dont function correctly, the irq is not disabled after call to portDISABLE_INTERRUPTS() or portENABLE_INTERRUPTS().
plz help me about this..

Regards.

wFrancis

RE: Sorry,but __disable_irq() does nothing?

Posted by Richard on July 6, 2009
Tasks run in System mode, so the interrupt masks can be accessed.

Regards.

RE: Sorry,but __disable_irq() does nothing?

Posted by francis wang on July 6, 2009
Thanks for your kindly reply!
However , I found that the watchdog timer not work well with the __disable_irq().It seems that the wdt resets the whole system even if I feed it in the task using __disable_irq() and __enable_irq() to ensure the feed is successful.

void wdtFeed(void)
{
__disable_irq();
WDFEED = 0xAA;
WDFEED = 0x55;
__enable_irq();
}

void wdtInit(uint tms)
{
__disable_irq();
WDTC = (ulong)(tms * configCPU_CLOCK_HZ / 4 / 1000);
WDMOD = 0x03;
WDFEED = 0xAA;
WDFEED = 0x55;
__enable_irq();
}

What 's up?Can you guide me?

Regards!
wFrancis


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