Hi all,
I am trying to enable the timer 0 interrupt for the AT91RM9200EK reference board.
Although the timer keeps running, its not generating interrupt, I enabled all the timer0 interrupts to ensure at least I get some interrupts being generated, but basically my interrupt routine never gets called.
I verified the status of the registers
aic_svr17 ---> Register contains the correct address of the irq function.(verifed through system.map file) aic_imr = 0x00020000 ---> The timer-0 interrupt is enabled. tc0_imr = 0xff ---> all timer interrupts are enabled. pmc_pcsr: 0x01022000 ---> corresponding peripheral clock is enabled.
But the IRQ function never gets called. (I use another test routine to read the counter value, the counter value is always zero)
Thanks,Balajee
#ifdef CONFIG_TIMER_INTERRUPTS static void get_timer_irq(void); #endif int interrupt_init (void) { unsigned short value; tmr = AT91C_BASE_TC0;
/* enables TC1.0 clock */ *AT91C_PMC_PCER = 1 << AT91C_ID_TC0; /* enable clock */
*AT91C_TCB0_BCR = 0; *AT91C_TCB0_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_NONE | AT91C_TCB_TC2XC2S_NONE; tmr->TC_CCR = AT91C_TC_CLKDIS; #define AT91C_TC_CMR_CPCTRG (1 << 14) /* set to MCLK/2 and restart the timer when the vlaue in TC_RC is reached */ tmr->TC_CMR = AT91C_TC_TIMER_DIV1_CLOCK | AT91C_TC_CMR_CPCTRG;
#ifdef CONFIG_TIMER_INTERRUPTS
/* Clear status */ value = tmr->TC_SR ; AT91PS_AIC pAic = AT91C_BASE_AIC;
/* Disable the timer interrupt */ pAic->AIC_IDCR = 1 << AT91C_ID_TC0; /* Program SVR and SMR */ pAic->AIC_SVR[AT91C_ID_TC0] = (unsigned int) &get_timer_irq; pAic->AIC_SMR[AT91C_ID_TC0] = AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE |AT91C_AIC_PRIOR_HIGHEST; /* Clear any pending Interrupts */ pAic->AIC_ICCR = 1 << AT91C_ID_TC0; /* Enable Interrupt on the timer control register */ tmr->TC_IER = 0xFF;
#else tmr->TC_IDR = ~0ul;
#endif tmr->TC_RC = TIMER_LOAD_VAL; lastinc = 0; tmr->TC_CCR = AT91C_TC_SWTRG | AT91C_TC_CLKEN; timestamp = 0;
#ifdef CONFIG_TIMER_INTERRUPTS /* Enable interrupt */ pAic->AIC_IECR = 1 << AT91C_ID_TC0; #endif return (0); }
#ifdef CONFIG_TIMER_INTERRUPTS static void get_timer_irq(void) { AT91PS_AIC pAic = AT91C_BASE_AIC; unsigned short value; counter++; /* Clear status */ value = tmr->TC_SR ; /* clear all interrupts */ pAic->AIC_ICCR = 1 << AT91C_ID_TC0;
pAic->AIC_EOICR = 0; } #endif