hi
@xiangjun_rong
i`m trying but did not get frequency value .please you have to give input frequency calculation code guide me
This code TIM1 PWM generation and TIM2 to get frequency if any changes you have to guide me and you have change this code
void TIM1_init(void) {
SIM->SCGC5 |= SIM_SCGC5_PORTB(1);
PORTB->PCR[0] = PORT_PCR_MUX(0x3); // Set pin as ALT3 (TIM1_CH1)
SIM->SCGC6 |= SIM_SCGC6_FTM1(1);
FTM1->SC = 0;
FTM1->MOD = 1999;
FTM1->CONTROLS[1].CnSC = FTM_CnSC_MSB_MASK | FTM_CnSC_ELSB_MASK;
FTM1->CONTROLS[1].CnV = 1000;
FTM1->SC = FTM_SC_PS(7) | FTM_SC_TOF(1);
}
void TIM2_init(void) {
// Enable clock for PORTA
SIM->SCGC5 |= SIM_SCGC5_PORTA_MASK;
PORTA->PCR[1] = PORT_PCR_MUX(0x3); // Set pin as ALT3 (TIM2_CH1)
SIM->SCGC6 |= SIM_SCGC6_FTM2(1);
FTM2->SC = 0;
FTM2->CONTROLS[1].CnSC = FTM_CnSC_ELSA_MASK | FTM_CnSC_ELSB_MASK |FTM_CnSC_CHIE_MASK;
FTM2->SC = FTM_SC_PS(7) | FTM_SC_TOF(1);
NVIC_EnableIRQ(FTM2_IRQn);
}
void FTM2_IRQHandler() {
// Clear channel flag
FTM2->CONTROLS[1].CnSC &= ~FTM_CnSC_CHF_MASK;
if (gap == 0) {
counter0 = FTM2->CONTROLS[1].CnV;
gap = 1;
} else {
counter1 = FTM2->CONTROLS[1].CnV;
if (counter1 > counter0) {
Counter = counter1 - counter0;
Frequency = 10000 / Counter;
} else {
Counter = counter1 + 0xFFFF - counter0 + 1;
Frequency = 10000 / Counter;
}
counter0 = counter1;
}
}
Thankyou
BR
PANDI
