Posted on March 12, 2007 at 11:33Hi all,
I'm currently using the timer system to receive a pulse (approx. 4KHz) which will arrive on the Input Capture A Reg on Timer 1. I'm using a Hitex Evaluation Board for the job. I am currently setting up the ICAPA pin to receive the pulse. I the the pulse to trigger the counter which I will then read into a variable within my code. I basically just want to keep track of the number of pulses that arrive so input capture functionality is not neccessary.
I have configured it as an alternate function push pull as the STR7 Manual suggests. I then clear the Status Reg, clear the Control Reg2 (CR2), reset the CR1 reg to 0 and then set bit 0(Ext clk) and bit 1 (rising edge triggers counter). Lastly, I enable the timer (bit 15 of CR1). My current problem is that the counter is not getting triggered and is remaining at its reset value of 0xfffc. I have also tried the same config for Timers 2&3 with no result. Any suggestions? See code below:
// set up for a Alternate function Config on P1.4
IOPORT1_PC0 |= ( 1 << 4 );
IOPORT1_PC1 |= ( 1 << 4 );
IOPORT1_PC2 |= ( 1 << 4 );
TIM1_SR = 0;//RESET
TIM1_CR2 = 0;//RESET
TIM1_CR1 = 0x0000;//RESET_TO_ZERO;
TIM1_CR1 |= ( 1 << 0 ) |
( 1 << 1 );
TIM1_CR1 |= ( 1 << TIMER_ENABLE );
