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ST timer problems

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 Christoph Franck over 18 years ago in reply to Johannes meier

0 1 are the bits 5 and 6 so it's 0x0000 0001 or not?

You just posted the piece of code that provides the answer to the question:

pAic->AIC_SMR[irq_id] = src_type | priority  ;

There is nothing in here that shifts src_type 5 bit positions to the left, is there ?

Also, you may want to work with the #define constants in the #include file instead of numeric values:

#define AT91C_AIC_SRCTYPE         (0x3 <<  5) // (AIC) Interrupt Source Type
#define         AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE  (0x0 <<  5) // (AIC) Internal Sources Code Label Level Sensitive
#define         AT91C_AIC_SRCTYPE_INT_EDGE_TRIGGERED   (0x1 <<  5) // (AIC) Internal Sources Code Label Edge triggered
#define         AT91C_AIC_SRCTYPE_EXT_HIGH_LEVEL       (0x2 <<  5) // (AIC) External Sources Code Label High-level Sensitive
#define         AT91C_AIC_SRCTYPE_EXT_POSITIVE_EDGE    (0x3 <<  5) // (AIC) External Sources Code Label Positive Edge triggered

Reply

0 Christoph Franck over 18 years ago in reply to Johannes meier

0 1 are the bits 5 and 6 so it's 0x0000 0001 or not?

You just posted the piece of code that provides the answer to the question:

pAic->AIC_SMR[irq_id] = src_type | priority  ;

There is nothing in here that shifts src_type 5 bit positions to the left, is there ?

Also, you may want to work with the #define constants in the #include file instead of numeric values:

#define AT91C_AIC_SRCTYPE         (0x3 <<  5) // (AIC) Interrupt Source Type
#define         AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE  (0x0 <<  5) // (AIC) Internal Sources Code Label Level Sensitive
#define         AT91C_AIC_SRCTYPE_INT_EDGE_TRIGGERED   (0x1 <<  5) // (AIC) Internal Sources Code Label Edge triggered
#define         AT91C_AIC_SRCTYPE_EXT_HIGH_LEVEL       (0x2 <<  5) // (AIC) External Sources Code Label High-level Sensitive
#define         AT91C_AIC_SRCTYPE_EXT_POSITIVE_EDGE    (0x3 <<  5) // (AIC) External Sources Code Label Positive Edge triggered

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