I am setting up a PWM on an iMX RT 1064.
I see the 25% duty cycle on the PWM output pin set by initialization.
The duty cycle does not change when I call PWM_UpdatePwmDutycycle().
I must have missed some setting, but I can’t seem to find it.
Below is my setup and update duty cycle.
[PKI_PWM_SOLENOID].base = BOARD_INITPINS_SOLENOID_OUT_PERIPHERAL,
[PKI_PWM_SOLENOID].subModule = kPWM_Module_3,
[PKI_PWM_SOLENOID].controlModule = kPWM_Control_Module_3,
[PKI_PWM_SOLENOID].mode = kPWM_EdgeAligned,
[PKI_PWM_SOLENOID].pwmSignal.pwmChannel = kPWM_PwmA,
[PKI_PWM_SOLENOID].pwmSignal.level = kPWM_HighTrue,
[PKI_PWM_SOLENOID].pwmSignal.dutyCyclePercent = 25, // Just for testing, should be '0', off
[PKI_PWM_SOLENOID].pwmFrequencyInHz = 24000
uint32_t pwmSourceClockInHz;
pwmSourceClockInHz = PWM_SRC_CLK_FREQ;
pwm_config_t pwm_config;
PWM_GetDefaultConfig(&pwm_config);
pwm_config.reloadLogic = kPWM_ReloadPwmFullCycle;
pwm_config.pairOperation = kPWM_Independent;
pwm_config.enableDebugMode = true;
pwm_config.clockSource = kPWM_BusClock;
pwm_config.prescale = kPWM_Prescale_Divide_4;
status_t status = PWM_Init(pPKIpwmconfig->base, pPKIpwmconfig->subModule, &pwm_config);
pwm_signal_param_t pwmSignal;
pwmSignal.pwmChannel = pPKIpwmconfig->pwmSignal.pwmChannel;
pwmSignal.level = pPKIpwmconfig->pwmSignal.level;
pwmSignal.dutyCyclePercent = pPKIpwmconfig->pwmSignal.dutyCyclePercent;
status = PWM_SetupPwm(pPKIpwmconfig->base, pPKIpwmconfig->subModule, &pwmSignal, 1, pPKIpwmconfig->mode,
pPKIpwmconfig->pwmFrequencyInHz, pwmSourceClockInHz);
pwm_module_control_t controlModule = pPKIpwmconfig->controlModule;
/* Set the load okay bit for all submodules to load registers from their buffer */
PWM_SetPwmLdok(pPKIpwmconfig->base, controlModule, true);
/* Start the PWM generation from Submodule */
PWM_StartTimer(pPKIpwmconfig->base, controlModule);
Update duty cycle
PWM_Type* base = pPWMConfig->base;
pwm_submodule_t subModule = pPWMConfig->subModule;
pwm_channels_t pwmSignal = pPWMConfig->pwmSignal.pwmChannel;
pwm_mode_t pwmMode = pPWMConfig->currPwmMode;
// --- DUTY CYCLE does not change with this call ---
PWM_UpdatePwmDutycycle(base, subModule, pwmSignal, pwmMode, pwmDuty_percent);
PWM_SetPwmLdok(base, pPWMConfig->controlModule, true);
