I configured my F280049C CPU timer 1 to generate an interrupt of 500us (0.5 ms) but I am not sure if my configuratio is correct. My configuation is below.
/**< configure system to run at 100MHz */
/**< PLLSYSCLK = 10MHz (SYSCTL_OSCSRC_OSC2) * 19 (IMULT) + 0.25 (FMULT) / 2 (PLLCLK_BY_2)*/
bool return_value = SysCtl_setClock(SYSCTL_OSCSRC_OSC2|SYSCTL_IMULT(0x13)
|SYSCTL_FMULT_1_4|SYSCTL_SYSDIV(0x2)
|SYSCTL_PLL_ENABLE);
Interrupt_register(INT_TIMER1, &timer::ISRTimer1);
SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TIMER1);
uint32_t temp = (uint32_t)(100000000 / 1000000 * 2000);
CPUTimer_setPeriod (CPUTIMER1_BASE, temp);
CPUTimer_setPreScaler (CPUTIMER1_BASE, 0);
CPUTimer_stopTimer(CPUTIMER1_BASE);
CPUTimer_reloadTimerCounter(CPUTIMER1_BASE);
CPUTimer_setEmulationMode(CPUTIMER1_BASE, CPUTIMER_EMULATIONMODE_STOPAFTERNEXTDECREMENT);
CPUTimer_clearOverflowFlag(CPUTIMER1_BASE);
/**< enable interrupt of the timer */
CPUTimer_enableInterrupt(CPUTIMER1_BASE);
/**< enable cpu interrupt number 13 for the timer 1 interrupt */
Interrupt_enable(INT_TIMER1);
/**< start timer */
CPUTimer_startTimer(CPUTIMER1_BASE);
I am using the lunch pad
From the debug window. It seems the timer is slower than the desired time. It is slow by a factor of 3. Is it because it is in debug mode?
What can the problem be.
Thanks.
