Hello, I have some questions regarding using the S32K312 EMIOS ICU for PWM measurement, and I would like to consult with you.
I am encountering an issue where the measured PWM period and duty cycle are both zero, but when I check the input pin with an oscilloscope, I can see a PWM wave being input.
Here is my code and configuration:
#define EMIOS_PWMIN_CHANNEL_1 2U /* EMIOS0 Channel 2 */
#define EMIOS_PWMIN_CHANNEL_2 3U /* EMIOS0 Channel 3 */
// Step 1: ICU Initialization
Emios_Mcl_Ip_Init(EMIOS_INSTANCE_0, &Emios_Mcl_Ip_0_Config_BOARD_INITPERIPHERALS);
Emios_Mcl_Ip_Init(EMIOS_INSTANCE_1, &Emios_Mcl_Ip_1_Config_BOARD_INITPERIPHERALS);
Emios_Icu_Ip_Init(0, &eMios_Icu_Ip_0_Config_PB);
IntCtrl_Ip_EnableIrq(EMIOS0_5_IRQn);
IntCtrl_Ip_InstallHandler(EMIOS0_5_IRQn, &EMIOS0_5_IRQ, NULL_PTR);
Emios_Icu_Ip_StartSignalMeasurement(0, EMIOS_PWMIN_CHANNEL_1);
Emios_Icu_Ip_StartSignalMeasurement(0, EMIOS_PWMIN_CHANNEL_2);
// Step 2: Running the following code at a 10ms interval
PWM_IN_1.period = 1000 * (float32)eMios_Icu_Ip_ChState[0].eMios_Icu_Ip_aPeriod /
(float32)Clock_Ip_GetClockFrequency(EMIOS0_CLK);
PWM_IN_1.duty = (float32)eMios_Icu_Ip_ChState[0].eMios_Icu_Ip_aActivePulseWidth /
(float32)(eMios_Icu_Ip_ChState[0].eMios_Icu_Ip_aPeriod + 1);
PWM_IN_2.period = 1000 * (float32)eMios_Icu_Ip_ChState[1].eMios_Icu_Ip_aPeriod /
(float32)Clock_Ip_GetClockFrequency(EMIOS0_CLK);
PWM_IN_2.duty = (float32)eMios_Icu_Ip_ChState[1].eMios_Icu_Ip_aActivePulseWidth /
(float32)(eMios_Icu_Ip_ChState[1].eMios_Icu_Ip_aPeriod + 1);
Thank you for your help. Currently, I am able to collect data, but I found that the duty cycle and period do not match my expectations. I input a PWM wave with 1KHZ and a duty cycle of 50% using the signal generator.
However, the collected data shows that ic_result_temp.PeriodTime = 54472, and ic_result_temp.ActiveTime = 1775.
According to the formula, the calculated duty cycle is 100*1775/54472=3%. And the frequency is Clock_Ip_GetClockFrequency(EMIOS0_CLK)/54472= 120MHZ/54472=2202HZ. Could you please take a look at it again?
