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ST timer problems

Johannes meier

Hello,

Could you help to install the ST timer on the AT91Rm9200? I don't know how to setup the AIC registers correct. Maybe there are more than one big mistake.

void initialize_pit()
{
        unsigned int  flag, period, irq_id, mask, oldHandler, src_type, priority;
        volatile int status;
        void *newHandler;

        //period
    Timer0->ST_PIMR = period << 5;

        AT91F_ST_SetPeriodInterval(Timer0, period);
        //state
        //status = Timer0->ST_SR;

        //enable interrupt
        flag=1;
        Timer0->ST_IER = flag;

        AT91F_ST_EnableIt( Timer0, flag);

        //enable PMC
        AT91F_PMC_EnablePeriphClock(AT91C_BASE_PMC, 1 << AT91C_ID_IRQ0);

        //config AIC
        irq_id = 0;
        oldHandler = pAic->AIC_SVR[irq_id];
        mask = 0x1 << irq_id;
        pAic->AIC_IDCR = mask ;
        pAic->AIC_SVR[irq_id] = (unsigned int) newHandler ;

        //* Store the Source Mode Register
    pAic->AIC_SMR[irq_id] = src_type | priority  ;


        AT91F_AIC_ConfigureIt(pAic, irq_id, priority, src_type, newHandler);

        //enable AIC
        AT91F_AIC_EnableIt(pAic, 1);
}

I hope somebody could help me with this problem...

best regards
johannes

Parents
  • 0 in reply to Johannes meier

    Very wrong. Look again at the data sheet. You are trying to store source type and priority in the same bits. Obviously that does not work. Have you read the data sheet? They normally very clearly shows what data is stored in the different bits of a register.

    Also, Christoph Franck have already written in an earlier post what values you may use for the source type. I can't see how you can manage to call the least significant bit "bit 5" or "bit 6".

Reply
  • 0 in reply to Johannes meier

    Very wrong. Look again at the data sheet. You are trying to store source type and priority in the same bits. Obviously that does not work. Have you read the data sheet? They normally very clearly shows what data is stored in the different bits of a register.

    Also, Christoph Franck have already written in an earlier post what values you may use for the source type. I can't see how you can manage to call the least significant bit "bit 5" or "bit 6".

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