Posted on May 17, 2011 at 15:11Hi klass,
Here below a code that I suggested in my previous message. This could help. I didn't compiled it but this is the idea.
TIM1_DeInit();
/* Set TIM1 Frequency to 10 kHz (=2Mhz/200), thus 1 unit = 0.1ms */
TIM1_TimeBaseInit(200, TIM1_COUNTERMODE_UP, 2500, 0);
/* TIM1 channel 1 is used (PC1) with rising edge and no divider nor filter */
TIM1_ICInit(TIM1_CHANNEL_1, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI, TIM1_ICPSC_DIV1, 0x0);
/* the trigger input (TRGI) to used to synchronize the counter is TI1FP1: Filtered timer input 1 (TI1FP1) */
TIM1_SelectInputTrigger(TIM1_TS_TI1FP1);
/* Reset mode - Rising edge of the selected trigger signal (TI1FP1 in this case) re-initializes the counter and
generates an update of the registers. */
TIM1_SelectSlaveMode(TIM1_SLAVEMODE_RESET);
/* Overflow interrupt after 250ms = 2500*0.1ms; Capture1 interrupt enabled */
TIM1_ITConfig(/*TIM1_IT_UPDATE | */TIM1_IT_CC1, ENABLE);
/* generate an update event */
TIM1_GenerateEvent(TIM1_EVENTSOURCE_UPDATE);
/* Clear CC1 and update Flag */
TIM1_ClearFlag(TIM1_FLAG_CC1 | TIM1_FLAG_UPDATE);
/* Enable TIM1 */
TIM1_Cmd(ENABLE);
/* enable global interrupts */
enableInterrupts();
/* Set the code below in TIM1 capture interrupt */
time = 10000/((double)TIM1_GetCapture1()); //by the way check that compiler is well handling this operation
if (time > 180){
time = 180;
}
pwm = ((u16)50*time+1400);
TIM2_SetCompare1(pwm);
Herzlich,
MCU Lufter
