Part Number: TMS320F28377S
Dear All,
In our system we have 10MHz external oscillator
Sysclkout configured to 50 MHz. We observed @ Sysclkout GPIO= 49.1 to 51 MHz
Timer 0 configured to generate 100 µs:
#define SYSCLK 50000000
#define TIMER_CLK 1000000
#define TIMER_TIME 100
void TimerInit(void)
{
Uint8 timer_prescal;
CpuTimer0Regs.TCR.bit.TSS = 1;
timer_prescal = SYSCLK/ TIMER_CLK
CpuTimer0Regs.TPR.bit.TDDR = timer_prescal;
CpuTimer0Regs.TCR.bit.TIE = 1;
CpuTimer0Regs.TCR.bit.FREE = 1;
SetTimer(TIMER_TIME);
CpuTimer0Regs.TCR.bit.TSS = 0;
}
void SetTimer(Uint32 time)
{
Uint32 tmr_prd;
tmr_prd = time;
tmr_prd = (TIMER_CLK/1000000)*time;
CpuTimer0Regs.PRD.bit.LSW = tmr_prd & 0xFFFF;
CpuTimer0Regs.PRD.bit.MSW = tmr_prd >> 16;
}
For required 100 usec interrupt, we observed interrupt gets trigger at 103 usec.
What are possible reasons for observation and how to overcome same?
Regards....
Yogesh
