void TC0_IrqHandler(void)
{
volatile unsigned int dummy;
// Clear status bit to acknowledge interrupt
dummy = AT91C_BASE_TC0->TC_SR;
printf(" %d ", i);
i=0;
}

void ConfigureTc(void)
{
unsigned int div;
unsigned int tcclks;

// Enable peripheral clock
AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_TC0;

// Configure TC for a 4Hz frequency and trigger on RC compare
TC_FindMckDivisor(1, BOARD_MCK, &div, &tcclks);
TC_Configure(AT91C_BASE_TC0, tcclks | AT91C_TC_CPCTRG);
AT91C_BASE_TC0->TC_RC = (BOARD_MCK / div) / 1; // timerFreq / desiredFreq

// Configure and enable interrupt on RC compare
IRQ_ConfigureIT(AT91C_ID_TC0, 0, TC0_IrqHandler);
AT91C_BASE_TC0->TC_IER = AT91C_TC_CPCS;
IRQ_EnableIT(AT91C_ID_TC0);

// Start the counter if LED is enabled.
if (pLedStates[1]) {

TC_Start(AT91C_BASE_TC0);
}
}

int main(void)
{
// DBGU output configuration
TRACE_CONFIGURE(DBGU_STANDARD, 115200, BOARD_MCK);
printf("-- Getting Started Project %s --\n\r", SOFTPACK_VERSION);
printf("-- %s\n\r", BOARD_NAME);
printf("-- Compiled: %s %s --\n\r", __DATE__, __TIME__);

ConfigureTc();

// Main loop
while (1) {
i++;
}
}

-- Getting Started Project 1.9-rc1 --
-- AT91SAM9M10-EKES
-- Compiled: Apr 18 2013 09:16:13 --
-I- configure pit.
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-- Getting Started Project 1.9-rc1 --
-- AT91SAM9M10-EKES
-- Compiled: Apr 18 2013 09:35:14 --
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