Other Parts Discussed in Thread: MSPM0G3507, SYSCONFIG
I am modifying the timx_timer_mode_periodic_standby_LP_MSPM0G3507_nortos_ticlang example for my Launch pad.
What I am trying to do is set it up to use the 40M crystal and have a timer period of 1 ms. However, I seem to be 20% or so off
I have set up the config this way:
Note that it says that the period should be 1 ms
But my period is actually 1.25 ms:
FYI, the counter is set to 4999
Here is the code:
#include "ti_msp_dl_config.h"
/* ((32KHz / (32+1)) * 0.5s) = 45 - 1 = 495 due to N+1 ticks */
#define TIMER_500_MILLISECONDS_TICKS (495)
/* ((32KHz / (32+1)) * 0.05s) = 50 - 1 = 49 due to N+1 ticks */
#define TIMER_50_MILLISECONDS_TICKS (49)
volatile uint32_t SetCount;
int main(void)
{
uint32_t setcount;
SYSCFG_DL_init();
SetCount = DL_Timer_getLoadValue(TIMER_0_INST);
NVIC_EnableIRQ(TIMER_0_INST_INT_IRQN);
DL_SYSCTL_enableSleepOnExit();
DL_TimerG_startCounter(TIMER_0_INST);
while (1) {
__WFI();
}
}
void TIMER_0_INST_IRQHandler(void)
{
switch (DL_TimerG_getPendingInterrupt(TIMER_0_INST)) {
case DL_TIMER_IIDX_ZERO:
/*
* Counter stopped to avoid a conflict with the timer reading
* the LOAD value while it's being set
*/
//DL_TimerG_stopCounter(TIMER_0_INST);
//DL_Timer_setLoadValue(TIMER_0_INST, count);
/*
* By default, this should load the new count value and count down
* from there (CVAE = 0)
*/
//DL_TimerG_startCounter(TIMER_0_INST);
DL_GPIO_togglePins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_1_PIN);
break;
default:
break;
}
}
