Dear NXP community,
Currently, I am developing a program using the on board SCTIMER peripheral. I am trying to start the CTIMER0 peripheral in the third state of my state implementation with the SCTIMER to produce a PWM signal. This PWM signal is routed to a GPIO pin. To realize this, I will need to implement an interupt in my third state to start the CTIMER0 in that state specifically. However, I have some trouble with programming such interupt as i am not very experienced. Could you help me out?
The code I am currently working on is specified below:
void SCT0_IRQHandler(void)
{
SCTIMER_EventHandleIRQ(SCT0_PERIPHERAL);
// Start CTIMER only when SCTIMER reaches state 2
CTIMER_StartTimer(CTIMER0_PERIPHERAL);
PRINTF("CTIMER started from SCTIMER state 2 event.\r\n");
}
static void SCT0_init(void) {
CTIMER0_init();
SCTIMER_Init(SCT0_PERIPHERAL, &SCT0_initConfig);
/* Enable interrupt SCT0_IRQN request in the NVIC */
/* Initialization of state 0 */
SCTIMER_SetupPwm(SCT0_PERIPHERAL, &SCT0_pwmSignalsConfig[0], kSCTIMER_EdgeAlignedPwm, 100U, SCT0_CLOCK_FREQ, &SCT0_pwmEvent[0]);
SCTIMER_SetupPwm(SCT0_PERIPHERAL, &SCT0_pwmSignalsConfig[2], kSCTIMER_EdgeAlignedPwm, 100U, SCT0_CLOCK_FREQ, &SCT0_pwmEvent[2]);
SCTIMER_CreateAndScheduleEvent(SCT0_PERIPHERAL, kSCTIMER_OutputRiseEvent, 0, kSCTIMER_Out_0, kSCTIMER_Counter_U, &SCT0_event[0]);
SCTIMER_SetupNextStateAction(SCT0_PERIPHERAL, 1, SCT0_event[0]);
SCTIMER_IncreaseState(SCT0_PERIPHERAL);
/* Initialization of state 1 */
/* Schedule the period event for the PWM */
SCTIMER_ScheduleEvent(SCT0, SCT0_pwmEvent[0]);
/* Schedule the pulse event for the PWM */
SCTIMER_ScheduleEvent(SCT0, SCT0_pwmEvent[0] + 1);
SCTIMER_SetupPwm(SCT0_PERIPHERAL, &SCT0_pwmSignalsConfig[1], kSCTIMER_EdgeAlignedPwm, 100U, SCT0_CLOCK_FREQ, &SCT0_pwmEvent[1]);
SCTIMER_CreateAndScheduleEvent(SCT0_PERIPHERAL, kSCTIMER_OutputRiseEvent, 0, kSCTIMER_Out_0, kSCTIMER_Counter_U, &SCT0_event[1]);
SCTIMER_SetupNextStateAction(SCT0_PERIPHERAL, 2, SCT0_event[1]);
SCTIMER_IncreaseState(SCT0_PERIPHERAL);
/* Initialization of state 2 */
/* Schedule the period event for the PWM */
SCTIMER_ScheduleEvent(SCT0, SCT0_pwmEvent[0]);
/* Schedule the pulse event for the PWM */
SCTIMER_ScheduleEvent(SCT0, SCT0_pwmEvent[0] + 1);
SCTIMER_SetupPwm(SCT0_PERIPHERAL, &SCT0_pwmSignalsConfig[3], kSCTIMER_EdgeAlignedPwm, 100U, SCT0_CLOCK_FREQ, &SCT0_pwmEvent[3]);
SCTIMER_CreateAndScheduleEvent(SCT0_PERIPHERAL, kSCTIMER_OutputRiseEvent, 0, kSCTIMER_Out_0, kSCTIMER_Counter_U, &SCT0_event_startCTimer);
SCTIMER_SetCallback(SCT0_PERIPHERAL, SCT0_IRQHandler, SCT0_event_startCTimer);
EnableIRQ(SCT0_IRQn);
}
The picture below shows the wave form at the start. The goal is to start the blue PWM signal at the fourth rising edge of the yellow PWM signal.
PROBLEM SOLVED:
I have already found out the solution to program the interupt correctly. The code implementation is shown below (CTIMER init not shown):
void SCT0_IRQHandler(void)
{
SCTIMER_EventHandleIRQ(SCT0_PERIPHERAL);
}
void Start_CTIMER(void)
{
// Start CTIMER only when SCTIMER reaches state 2
CTIMER_StartTimer(CTIMER0_PERIPHERAL);
PRINTF("CTIMER started from SCTIMER state 2 event.\r\n");
}
const sctimer_config_t SCT0_initConfig = {
.enableCounterUnify = true,
.clockMode = kSCTIMER_System_ClockMode,
.clockSelect = kSCTIMER_Clock_On_Rise_Input_0,
.enableBidirection_l = false,
.enableBidirection_h = false,
.prescale_l = 0U,
.prescale_h = 0U,
.outInitState = 0U,
.inputsync = 0U
};
const sctimer_pwm_signal_param_t SCT0_pwmSignalsConfig[4] = {
{
.output = kSCTIMER_Out_0,
.level = kSCTIMER_HighTrue,
.dutyCyclePercent = 50U
},
{
.output = kSCTIMER_Out_1,
.level = kSCTIMER_HighTrue,
.dutyCyclePercent = 100U
},
{
.output = kSCTIMER_Out_1,
.level = kSCTIMER_HighTrue,
.dutyCyclePercent = 0U
},
{
.output = kSCTIMER_Out_1,
.level = kSCTIMER_HighTrue,
.dutyCyclePercent = 0U
}
};
uint32_t SCT0_pwmEvent[4];
uint32_t SCT0_event[4];
uint32_t SCT0_event_startCTimer;
static void SCT0_init(void) {
SCTIMER_Init(SCT0_PERIPHERAL, &SCT0_initConfig);
/* Enable interrupt SCT0_IRQN request in the NVIC */
/* Initialization of state 0 */
SCTIMER_SetupPwm(SCT0_PERIPHERAL, &SCT0_pwmSignalsConfig[0], kSCTIMER_EdgeAlignedPwm, 100U, SCT0_CLOCK_FREQ, &SCT0_pwmEvent[0]);
SCTIMER_SetupPwm(SCT0_PERIPHERAL, &SCT0_pwmSignalsConfig[2], kSCTIMER_EdgeAlignedPwm, 100U, SCT0_CLOCK_FREQ, &SCT0_pwmEvent[2]);
SCTIMER_CreateAndScheduleEvent(SCT0_PERIPHERAL, kSCTIMER_OutputRiseEvent, 0, kSCTIMER_Out_0, kSCTIMER_Counter_U, &SCT0_event[0]);
SCTIMER_SetupNextStateAction(SCT0_PERIPHERAL, 1, SCT0_event[0]);
SCTIMER_IncreaseState(SCT0_PERIPHERAL);
/* Initialization of state 1 */
/* Schedule the period event for the PWM */
SCTIMER_ScheduleEvent(SCT0, SCT0_pwmEvent[0]);
/* Schedule the pulse event for the PWM */
SCTIMER_ScheduleEvent(SCT0, SCT0_pwmEvent[0] + 1);
SCTIMER_SetupPwm(SCT0_PERIPHERAL, &SCT0_pwmSignalsConfig[1], kSCTIMER_EdgeAlignedPwm, 100U, SCT0_CLOCK_FREQ, &SCT0_pwmEvent[1]);
SCTIMER_CreateAndScheduleEvent(SCT0_PERIPHERAL, kSCTIMER_OutputRiseEvent, 0, kSCTIMER_Out_0, kSCTIMER_Counter_U, &SCT0_event[1]);
SCTIMER_SetupNextStateAction(SCT0_PERIPHERAL, 2, SCT0_event[1]);
SCTIMER_IncreaseState(SCT0_PERIPHERAL);
/* Initialization of state 2 */
/* Schedule the period event for the PWM */
SCTIMER_ScheduleEvent(SCT0, SCT0_pwmEvent[0]);
/* Schedule the pulse event for the PWM */
SCTIMER_ScheduleEvent(SCT0, SCT0_pwmEvent[0] + 1);
SCTIMER_SetupPwm(SCT0_PERIPHERAL, &SCT0_pwmSignalsConfig[3], kSCTIMER_EdgeAlignedPwm, 100U, SCT0_CLOCK_FREQ, &SCT0_pwmEvent[3]);
SCTIMER_CreateAndScheduleEvent(SCT0_PERIPHERAL, kSCTIMER_OutputRiseEvent, 0, kSCTIMER_Out_0, kSCTIMER_Counter_U, &SCT0_event_startCTimer);
SCTIMER_SetCallback(SCT0_PERIPHERAL, Start_CTIMER, SCT0_event_startCTimer);
SCTIMER_EnableInterrupts(SCT0, (1U << SCT0_event_startCTimer));
EnableIRQ(SCT0_IRQn);
}
