Prev: How to use VIO and core inserter at the same time.
From: self on 13 Aug 2010 14:09
Hello,

I am trying to measure the execution time of some code using a
CoreTimer block connected to a Cortex-M1 processor design in an Actel
Fusion part.

My problem is that TMR_current_value() always returns 0. I am trying
to run in TMR_ONE_SHOT_MODE but I have also tried continuous mode but
no change. I have also double checked that the CoreTimer block is
attached to the APB bus and that the base address in hardware
corresponds to CORETMR_BASE_ADDR in my C source.

Can anyone suggest a reason that TMR_current_value() always returns
0?

Below I attache my C code.


int main( void )
{
int i;
uint32_t tmr_read_val, tmr_pre_val, tmr_diff;
const uint32_t tmr_load_val = 0x12345678;

uint32_t gpio_out = GPOUT_INIT_STATE;
GPIO_init( &g_gpio, COREGPIO_BASE_ADDR, GPOUT_INIT_STATE );
TMR_init(&g_timer, CORETMR_BASE_ADDR,
TMR_ONE_SHOT_MODE,PRESCALER_DIV_2,tmr_load_val);
TMR_start(&g_timer);

i=0;
while(1){
i++;
if ( (i % 0x1FFF) == 0 ){
tmr_pre_val = tmr_read_val;
tmr_read_val = TMR_current_value(&g_timer);
tmr_diff = tmr_pre_val - tmr_read_val;
GPIO_set_outputs( &g_gpio, gpio_out++ );
TMR_reload(&g_timer,tmr_load_val);
}
}
}

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