Hello
I am trying this seemingly effortless task, but am not able to get there.
I am measuring a pulse time of an input pulse on TPM Channel-1. Frequency is 50Hz.
Please see attached code snippets where i initialise the timer.
#define BusFrequency 8MHz
#define TIMER_START 0x4F // bus clk,divide by 128
#define TIMER_OVERFLOW 0xFFFF //maximum
interrupt 6 void Timer1_Capture (void)
{
TPMC1SC = 0; //Clear interrupt , ack interrupt
inputCycleTime[p] = TPMC1V; //get value of TPMC1V at this edge
p++; // increment count for next edge capture
if(p >= 1)
{
inputWidth = inputCycleTime[1]-inputCycleTime[0]; //determine duration
p=0;
TPMC1V =0;
}
TPMC1SC = 0x44; // rising edge initiate
}
void Timer1_init(void)
{
// Timer1 period
TPMMOD = TIMER_OVERFLOW;
TPMC1SC = 0x44; //i/p capture rising edge captures
//0x0c =both edges, 0x08 = falling edges
}
Now i run in all sorts of troubles with above code.I should be able to read 20ms of time = 1250 counts between both rising edges
but i get a varied value unaccounted for.
Can someone throw some light?
Thnks and Regards
