low CC2430 Timer1 resolution

What are you trying to solve?

A polling loop is the fastest solution, but you will not manage to do anything else then.

Hi,

Thanks for replying.

I am trying to implement a simple solution for counter with a resolution of 1us or better without the complexity of managing my software counter in addition to timer ticks.

Thanks in advance for your time and advice

Cheers,
Lewis

I set the CC2430 system clock to 32MHz, timer tick period = 32MHZ and am running Timer1 at 32MHz (prescaler = 0). The Lowest interval period i could acieve was about 1600ns.

something is amiss as 7* 1/32M is ~ 33*7 ~ 230ns

show the part(s) of your code involved in this

I do not know your chip but you are using the RCAP reload, I hope.

Erik

Hi Erik,
Thanks for replying . Please find below my source code

//////////////////////////////////////////////
int main( void )
{

P1DIR |= 0x01;

SLEEP &= ~ (0x03 + 0x04) ;// poweer mode 0, both oscillators powered up

for(int i =0; i<0xFFFF; i++)

{}//wait for osc to stabilize

CLKCON = 0; // 32K crsyt, 32MHz sys clock, Tickspeed 32MHz

T1CTL = 0x02;//Timer1 running upto T1CC0

T1CC0L = 32 ; // 32 * 31.25ns = 1.0 us - channel 0 compare cnt

T1CC0H = 0;

//TIMIF |= 0x40;//enable timer1 overflow interrupt

T1CCTL0 = (0x40 + 0x04); //enable Timer1 compare interrpts , compare mode on channel 0

T1IE = 1; //enable timer1 Interrots

EA = 1;

while(1)

{}

}

#pragma vector=T1_VECTOR

__interrupt void my_interrupt_handler(void)

{

if(T1CTL & 0x20) //timer 1 channel0 interrupt

P1 ^=0x01;

}

//////////////////////////////////////////////

I dint understand the meaning of 'RCAP load'

Thanks for your time and advice
Cheers,
Lewis

strange beast you have (not that necessarily is wrong)

I dint understand the meaning of 'RCAP load'
have a look at any timer 2 in a 'regular' '51.

Your chip,evidently is so far from the norm that I can not help any without diving into the datasheet, unfortiunately time does not permit that.

let's hope somebody familiar with your chip comes to teh reescue.

Erik