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MCUXpresso_LPC54102/devices/LPC54102/drivers/fsl_sctimer.c

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/*
* Copyright (c) 2016, Freescale Semiconductor, Inc.
* Copyright 2016-2019 NXP
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "fsl_sctimer.h"
/*******************************************************************************
* Definitions
******************************************************************************/
/* Component ID definition, used by tools. */
#ifndef FSL_COMPONENT_ID
#define FSL_COMPONENT_ID "platform.drivers.sctimer"
#endif
/*! @brief Typedef for interrupt handler. */
typedef void (*sctimer_isr_t)(SCT_Type *base);
/*******************************************************************************
* Prototypes
******************************************************************************/
/*!
* @brief Gets the instance from the base address
*
* @param base SCTimer peripheral base address
*
* @return The SCTimer instance
*/
static uint32_t SCTIMER_GetInstance(SCT_Type *base);
/*******************************************************************************
* Variables
******************************************************************************/
/*! @brief Pointers to SCT bases for each instance. */
static SCT_Type *const s_sctBases[] = SCT_BASE_PTRS;
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
/*! @brief Pointers to SCT clocks for each instance. */
static const clock_ip_name_t s_sctClocks[] = SCT_CLOCKS;
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
#if !(defined(FSL_SDK_DISABLE_DRIVER_RESET_CONTROL) && FSL_SDK_DISABLE_DRIVER_RESET_CONTROL)
#if defined(FSL_FEATURE_SCT_WRITE_ZERO_ASSERT_RESET) && FSL_FEATURE_SCT_WRITE_ZERO_ASSERT_RESET
/*! @brief Pointers to SCT resets for each instance, writing a zero asserts the reset */
static const reset_ip_name_t s_sctResets[] = SCT_RSTS_N;
#else
/*! @brief Pointers to SCT resets for each instance, writing a one asserts the reset */
static const reset_ip_name_t s_sctResets[] = SCT_RSTS;
#endif
#endif /* FSL_SDK_DISABLE_DRIVER_RESET_CONTROL */
/*!< @brief SCTimer event Callback function. */
static sctimer_event_callback_t s_eventCallback[FSL_FEATURE_SCT_NUMBER_OF_EVENTS];
/*!< @brief Keep track of SCTimer event number */
static uint32_t s_currentEvent;
/*!< @brief Keep track of SCTimer state number */
static uint32_t s_currentState;
/*!< @brief Keep track of SCTimer match/capture register number */
static uint32_t s_currentMatch;
/*! @brief Pointer to SCTimer IRQ handler */
static sctimer_isr_t s_sctimerIsr;
/*******************************************************************************
* Code
******************************************************************************/
static uint32_t SCTIMER_GetInstance(SCT_Type *base)
{
uint32_t instance;
uint32_t sctArrayCount = (sizeof(s_sctBases) / sizeof(s_sctBases[0]));
/* Find the instance index from base address mappings. */
for (instance = 0; instance < sctArrayCount; instance++)
{
if (s_sctBases[instance] == base)
{
break;
}
}
assert(instance < sctArrayCount);
return instance;
}
/*!
* brief Ungates the SCTimer clock and configures the peripheral for basic operation.
*
* note This API should be called at the beginning of the application using the SCTimer driver.
*
* param base SCTimer peripheral base address
* param config Pointer to the user configuration structure.
*
* return kStatus_Success indicates success; Else indicates failure.
*/
status_t SCTIMER_Init(SCT_Type *base, const sctimer_config_t *config)
{
assert(config);
uint32_t i;
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
/* Enable the SCTimer clock*/
CLOCK_EnableClock(s_sctClocks[SCTIMER_GetInstance(base)]);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
#if !(defined(FSL_SDK_DISABLE_DRIVER_RESET_CONTROL) && FSL_SDK_DISABLE_DRIVER_RESET_CONTROL)
/* Reset the module. */
RESET_PeripheralReset(s_sctResets[SCTIMER_GetInstance(base)]);
#endif /* FSL_SDK_DISABLE_DRIVER_RESET_CONTROL */
/* Setup the counter operation. For Current Driver interface SCTIMER_Init don't know detail
* frequency of input clock, but User know it. So the INSYNC have to set by user level. */
base->CONFIG = SCT_CONFIG_CKSEL(config->clockSelect) | SCT_CONFIG_CLKMODE(config->clockMode) |
SCT_CONFIG_UNIFY(config->enableCounterUnify) | SCT_CONFIG_INSYNC(config->inputsync);
/* Write to the control register, clear the counter and keep the counters halted */
base->CTRL = SCT_CTRL_BIDIR_L(config->enableBidirection_l) | SCT_CTRL_PRE_L(config->prescale_l) |
SCT_CTRL_CLRCTR_L_MASK | SCT_CTRL_HALT_L_MASK;
if (!(config->enableCounterUnify))
{
base->CTRL |= SCT_CTRL_BIDIR_H(config->enableBidirection_h) | SCT_CTRL_PRE_H(config->prescale_h) |
SCT_CTRL_CLRCTR_H_MASK | SCT_CTRL_HALT_H_MASK;
}
/* Initial state of channel output */
base->OUTPUT = config->outInitState;
/* Clear the global variables */
s_currentEvent = 0;
s_currentState = 0;
s_currentMatch = 0;
/* Clear the callback array */
for (i = 0; i < FSL_FEATURE_SCT_NUMBER_OF_EVENTS; i++)
{
s_eventCallback[i] = NULL;
}
/* Save interrupt handler */
s_sctimerIsr = SCTIMER_EventHandleIRQ;
return kStatus_Success;
}
/*!
* brief Gates the SCTimer clock.
*
* param base SCTimer peripheral base address
*/
void SCTIMER_Deinit(SCT_Type *base)
{
/* Halt the counters */
base->CTRL |= (SCT_CTRL_HALT_L_MASK | SCT_CTRL_HALT_H_MASK);
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
/* Disable the SCTimer clock*/
CLOCK_DisableClock(s_sctClocks[SCTIMER_GetInstance(base)]);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
}
/*!
* brief Fills in the SCTimer configuration structure with the default settings.
*
* The default values are:
* code
* config->enableCounterUnify = true;
* config->clockMode = kSCTIMER_System_ClockMode;
* config->clockSelect = kSCTIMER_Clock_On_Rise_Input_0;
* config->enableBidirection_l = false;
* config->enableBidirection_h = false;
* config->prescale_l = 0U;
* config->prescale_h = 0U;
* config->outInitState = 0U;
* config->inputsync = 0xFU;
* endcode
* param config Pointer to the user configuration structure.
*/
void SCTIMER_GetDefaultConfig(sctimer_config_t *config)
{
assert(config);
/* Initializes the configure structure to zero. */
memset(config, 0, sizeof(*config));
/* SCT operates as a unified 32-bit counter */
config->enableCounterUnify = true;
/* System clock clocks the entire SCT module */
config->clockMode = kSCTIMER_System_ClockMode;
/* This is used only by certain clock modes */
config->clockSelect = kSCTIMER_Clock_On_Rise_Input_0;
/* Up count mode only for the unified counter */
config->enableBidirection_l = false;
/* Up count mode only for Counte_H */
config->enableBidirection_h = false;
/* Prescale factor of 1 */
config->prescale_l = 0U;
/* Prescale factor of 1 for Counter_H*/
config->prescale_h = 0U;
/* Clear outputs */
config->outInitState = 0U;
/* Default value is 0xFU, it can be clear as 0 when speical conditions met.
* Condition can be clear as 0: (for all Clock Modes):
* (1) The corresponding input is already synchronous to the SCTimer/PWM clock.
* (2) The SCTimer/PWM clock frequency does not exceed 100 MHz.
* Note: The SCTimer/PWM clock is the bus/system clock for CKMODE 0-2 or asynchronous input
* clock for CKMODE3.
* Another condition can be clear as 0: (for CKMODE2 only)
* (1) The corresponding input is synchronous to the designated CKMODE2 input clock.
* (2) The CKMODE2 input clock frequency is less than one-third the frequency of the bus/system clock.
* Default value set as 0U, input0~input3 are set as bypasses. */
config->inputsync = 0xFU;
}
/*!
* brief Configures the PWM signal parameters.
*
* Call this function to configure the PWM signal period, mode, duty cycle, and edge. This
* function will create 2 events; one of the events will trigger on match with the pulse value
* and the other will trigger when the counter matches the PWM period. The PWM period event is
* also used as a limit event to reset the counter or change direction. Both events are enabled
* for the same state. The state number can be retrieved by calling the function
* SCTIMER_GetCurrentStateNumber().
* The counter is set to operate as one 32-bit counter (unify bit is set to 1).
* The counter operates in bi-directional mode when generating a center-aligned PWM.
*
* note When setting PWM output from multiple output pins, they all should use the same PWM mode
* i.e all PWM's should be either edge-aligned or center-aligned.
* When using this API, the PWM signal frequency of all the initialized channels must be the same.
* Otherwise all the initialized channels' PWM signal frequency is equal to the last call to the
* API's pwmFreq_Hz.
*
* param base SCTimer peripheral base address
* param pwmParams PWM parameters to configure the output
* param mode PWM operation mode, options available in enumeration ::sctimer_pwm_mode_t
* param pwmFreq_Hz PWM signal frequency in Hz
* param srcClock_Hz SCTimer counter clock in Hz
* param event Pointer to a variable where the PWM period event number is stored
*
* return kStatus_Success on success
* kStatus_Fail If we have hit the limit in terms of number of events created or if
* an incorrect PWM dutycylce is passed in.
*/
status_t SCTIMER_SetupPwm(SCT_Type *base,
const sctimer_pwm_signal_param_t *pwmParams,
sctimer_pwm_mode_t mode,
uint32_t pwmFreq_Hz,
uint32_t srcClock_Hz,
uint32_t *event)
{
assert(pwmParams);
assert(srcClock_Hz);
assert(pwmFreq_Hz);
assert(pwmParams->output < FSL_FEATURE_SCT_NUMBER_OF_OUTPUTS);
uint32_t period, pulsePeriod = 0;
uint32_t sctClock = srcClock_Hz / (((base->CTRL & SCT_CTRL_PRE_L_MASK) >> SCT_CTRL_PRE_L_SHIFT) + 1);
uint32_t periodEvent = 0, pulseEvent = 0;
uint32_t reg;
/* This function will create 2 events, return an error if we do not have enough events available */
if ((s_currentEvent + 2) > FSL_FEATURE_SCT_NUMBER_OF_EVENTS)
{
return kStatus_Fail;
}
if (pwmParams->dutyCyclePercent == 0)
{
return kStatus_Fail;
}
/* Set unify bit to operate in 32-bit counter mode */
base->CONFIG |= SCT_CONFIG_UNIFY_MASK;
/* Use bi-directional mode for center-aligned PWM */
if (mode == kSCTIMER_CenterAlignedPwm)
{
base->CTRL |= SCT_CTRL_BIDIR_L_MASK;
}
/* Calculate PWM period match value */
if (mode == kSCTIMER_EdgeAlignedPwm)
{
period = (sctClock / pwmFreq_Hz) - 1;
}
else
{
period = sctClock / (pwmFreq_Hz * 2);
}
/* Calculate pulse width match value */
pulsePeriod = (period * pwmParams->dutyCyclePercent) / 100;
/* For 100% dutycyle, make pulse period greater than period so the event will never occur */
if (pwmParams->dutyCyclePercent >= 100)
{
pulsePeriod = period + 2;
}
/* Schedule an event when we reach the PWM period */
SCTIMER_CreateAndScheduleEvent(base, kSCTIMER_MatchEventOnly, period, 0, kSCTIMER_Counter_L, &periodEvent);
/* Schedule an event when we reach the pulse width */
SCTIMER_CreateAndScheduleEvent(base, kSCTIMER_MatchEventOnly, pulsePeriod, 0, kSCTIMER_Counter_L, &pulseEvent);
/* Reset the counter when we reach the PWM period */
SCTIMER_SetupCounterLimitAction(base, kSCTIMER_Counter_L, periodEvent);
/* Return the period event to the user */
*event = periodEvent;
/* For high-true level */
if (pwmParams->level == kSCTIMER_HighTrue)
{
/* Set the initial output level to low which is the inactive state */
base->OUTPUT &= ~(1U << pwmParams->output);
if (mode == kSCTIMER_EdgeAlignedPwm)
{
/* Set the output when we reach the PWM period */
SCTIMER_SetupOutputSetAction(base, pwmParams->output, periodEvent);
/* Clear the output when we reach the PWM pulse value */
SCTIMER_SetupOutputClearAction(base, pwmParams->output, pulseEvent);
}
else
{
/* Clear the output when we reach the PWM pulse event */
SCTIMER_SetupOutputClearAction(base, pwmParams->output, pulseEvent);
/* Reverse output when down counting */
reg = base->OUTPUTDIRCTRL;
reg &= ~(SCT_OUTPUTDIRCTRL_SETCLR0_MASK << (2 * pwmParams->output));
reg |= (1U << (2 * pwmParams->output));
base->OUTPUTDIRCTRL = reg;
}
}
/* For low-true level */
else
{
/* Set the initial output level to high which is the inactive state */
base->OUTPUT |= (1U << pwmParams->output);
if (mode == kSCTIMER_EdgeAlignedPwm)
{
/* Clear the output when we reach the PWM period */
SCTIMER_SetupOutputClearAction(base, pwmParams->output, periodEvent);
/* Set the output when we reach the PWM pulse value */
SCTIMER_SetupOutputSetAction(base, pwmParams->output, pulseEvent);
}
else
{
/* Set the output when we reach the PWM pulse event */
SCTIMER_SetupOutputSetAction(base, pwmParams->output, pulseEvent);
/* Reverse output when down counting */
reg = base->OUTPUTDIRCTRL;
reg &= ~(SCT_OUTPUTDIRCTRL_SETCLR0_MASK << (2 * pwmParams->output));
reg |= (1U << (2 * pwmParams->output));
base->OUTPUTDIRCTRL = reg;
}
}
return kStatus_Success;
}
/*!
* brief Updates the duty cycle of an active PWM signal.
*
* param base SCTimer peripheral base address
* param output The output to configure
* param dutyCyclePercent New PWM pulse width; the value should be between 1 to 100
* param event Event number associated with this PWM signal. This was returned to the user by the
* function SCTIMER_SetupPwm().
*/
void SCTIMER_UpdatePwmDutycycle(SCT_Type *base, sctimer_out_t output, uint8_t dutyCyclePercent, uint32_t event)
{
assert(dutyCyclePercent > 0);
assert(output < FSL_FEATURE_SCT_NUMBER_OF_OUTPUTS);
uint32_t periodMatchReg, pulseMatchReg;
uint32_t pulsePeriod = 0, period;
/* Retrieve the match register number for the PWM period */
periodMatchReg = base->EV[event].CTRL & SCT_EV_CTRL_MATCHSEL_MASK;
/* Retrieve the match register number for the PWM pulse period */
pulseMatchReg = base->EV[event + 1].CTRL & SCT_EV_CTRL_MATCHSEL_MASK;
period = base->MATCH[periodMatchReg];
/* Calculate pulse width match value */
pulsePeriod = (period * dutyCyclePercent) / 100;
/* For 100% dutycyle, make pulse period greater than period so the event will never occur */
if (dutyCyclePercent >= 100)
{
pulsePeriod = period + 2;
}
/* Stop the counter before updating match register */
SCTIMER_StopTimer(base, kSCTIMER_Counter_L);
/* Update dutycycle */
base->MATCH[pulseMatchReg] = SCT_MATCH_MATCHn_L(pulsePeriod);
base->MATCHREL[pulseMatchReg] = SCT_MATCHREL_RELOADn_L(pulsePeriod);
/* Restart the counter */
SCTIMER_StartTimer(base, kSCTIMER_Counter_L);
}
/*!
* brief Create an event that is triggered on a match or IO and schedule in current state.
*
* This function will configure an event using the options provided by the user. If the event type uses
* the counter match, then the function will set the user provided match value into a match register
* and put this match register number into the event control register.
* The event is enabled for the current state and the event number is increased by one at the end.
* The function returns the event number; this event number can be used to configure actions to be
* done when this event is triggered.
*
* param base SCTimer peripheral base address
* param howToMonitor Event type; options are available in the enumeration ::sctimer_interrupt_enable_t
* param matchValue The match value that will be programmed to a match register
* param whichIO The input or output that will be involved in event triggering. This field
* is ignored if the event type is "match only"
* param whichCounter SCTimer counter to use when operating in 16-bit mode. In 32-bit mode, this
* field has no meaning as we have only 1 unified counter; hence ignored.
* param event Pointer to a variable where the new event number is stored
*
* return kStatus_Success on success
* kStatus_Error if we have hit the limit in terms of number of events created or
if we have reached the limit in terms of number of match registers
*/
status_t SCTIMER_CreateAndScheduleEvent(SCT_Type *base,
sctimer_event_t howToMonitor,
uint32_t matchValue,
uint32_t whichIO,
sctimer_counter_t whichCounter,
uint32_t *event)
{
uint32_t combMode = (((uint32_t)howToMonitor & SCT_EV_CTRL_COMBMODE_MASK) >> SCT_EV_CTRL_COMBMODE_SHIFT);
uint32_t currentCtrlVal = howToMonitor;
/* Return an error if we have hit the limit in terms of number of events created */
if (s_currentEvent >= FSL_FEATURE_SCT_NUMBER_OF_EVENTS)
{
return kStatus_Fail;
}
/* IO only mode */
if (combMode == 0x2U)
{
base->EV[s_currentEvent].CTRL = currentCtrlVal | SCT_EV_CTRL_IOSEL(whichIO);
}
/* Match mode only */
else if (combMode == 0x1U)
{
/* Return an error if we have hit the limit in terms of number of number of match registers */
if (s_currentMatch >= FSL_FEATURE_SCT_NUMBER_OF_MATCH_CAPTURE)
{
return kStatus_Fail;
}
currentCtrlVal |= SCT_EV_CTRL_MATCHSEL(s_currentMatch);
/* Use Counter_L bits if counter is operating in 32-bit mode or user wants to setup the L counter */
if ((base->CONFIG & SCT_CONFIG_UNIFY_MASK) || (whichCounter == kSCTIMER_Counter_L))
{
base->MATCH[s_currentMatch] = SCT_MATCH_MATCHn_L(matchValue);
base->MATCHREL[s_currentMatch] = SCT_MATCHREL_RELOADn_L(matchValue);
}
else
{
/* Select the counter, no need for this if operating in 32-bit mode */
currentCtrlVal |= SCT_EV_CTRL_HEVENT(whichCounter);
base->MATCH[s_currentMatch] = SCT_MATCH_MATCHn_H(matchValue);
base->MATCHREL[s_currentMatch] = SCT_MATCHREL_RELOADn_H(matchValue);
}
base->EV[s_currentEvent].CTRL = currentCtrlVal;
/* Increment the match register number */
s_currentMatch++;
}
/* Use both Match & IO */
else
{
/* Return an error if we have hit the limit in terms of number of number of match registers */
if (s_currentMatch >= FSL_FEATURE_SCT_NUMBER_OF_MATCH_CAPTURE)
{
return kStatus_Fail;
}
currentCtrlVal |= SCT_EV_CTRL_MATCHSEL(s_currentMatch) | SCT_EV_CTRL_IOSEL(whichIO);
/* Use Counter_L bits if counter is operating in 32-bit mode or user wants to setup the L counter */
if ((base->CONFIG & SCT_CONFIG_UNIFY_MASK) || (whichCounter == kSCTIMER_Counter_L))
{
base->MATCH[s_currentMatch] = SCT_MATCH_MATCHn_L(matchValue);
base->MATCHREL[s_currentMatch] = SCT_MATCHREL_RELOADn_L(matchValue);
}
else
{
/* Select the counter, no need for this if operating in 32-bit mode */
currentCtrlVal |= SCT_EV_CTRL_HEVENT(whichCounter);
base->MATCH[s_currentMatch] = SCT_MATCH_MATCHn_H(matchValue);
base->MATCHREL[s_currentMatch] = SCT_MATCHREL_RELOADn_H(matchValue);
}
base->EV[s_currentEvent].CTRL = currentCtrlVal;
/* Increment the match register number */
s_currentMatch++;
}
/* Enable the event in the current state */
base->EV[s_currentEvent].STATE = (1U << s_currentState);
/* Return the event number */
*event = s_currentEvent;
/* Increment the event number */
s_currentEvent++;
return kStatus_Success;
}
/*!
* brief Enable an event in the current state.
*
* This function will allow the event passed in to trigger in the current state. The event must
* be created earlier by either calling the function SCTIMER_SetupPwm() or function
* SCTIMER_CreateAndScheduleEvent() .
*
* param base SCTimer peripheral base address
* param event Event number to enable in the current state
*
*/
void SCTIMER_ScheduleEvent(SCT_Type *base, uint32_t event)
{
/* Enable event in the current state */
base->EV[event].STATE |= (1U << s_currentState);
}
/*!
* brief Increase the state by 1
*
* All future events created by calling the function SCTIMER_ScheduleEvent() will be enabled in this new
* state.
*
* param base SCTimer peripheral base address
*
* return kStatus_Success on success
* kStatus_Error if we have hit the limit in terms of states used
*/
status_t SCTIMER_IncreaseState(SCT_Type *base)
{
/* Return an error if we have hit the limit in terms of states used */
if (s_currentState >= FSL_FEATURE_SCT_NUMBER_OF_STATES)
{
return kStatus_Fail;
}
s_currentState++;
return kStatus_Success;
}
/*!
* brief Provides the current state
*
* User can use this to set the next state by calling the function SCTIMER_SetupNextStateAction().
*
* param base SCTimer peripheral base address
*
* return The current state
*/
uint32_t SCTIMER_GetCurrentState(SCT_Type *base)
{
return s_currentState;
}
/*!
* brief Toggle the output level.
*
* This change in the output level is triggered by the event number that is passed in by the user.
*
* param base SCTimer peripheral base address
* param whichIO The output to toggle
* param event Event number that will trigger the output change
*/
void SCTIMER_SetupOutputToggleAction(SCT_Type *base, uint32_t whichIO, uint32_t event)
{
assert(whichIO < FSL_FEATURE_SCT_NUMBER_OF_OUTPUTS);
uint32_t reg;
/* Set the same event to set and clear the output */
base->OUT[whichIO].CLR |= (1U << event);
base->OUT[whichIO].SET |= (1U << event);
/* Set the conflict resolution to toggle output */
reg = base->RES;
reg &= ~(SCT_RES_O0RES_MASK << (2 * whichIO));
reg |= (uint32_t)(kSCTIMER_ResolveToggle << (2 * whichIO));
base->RES = reg;
}
/*!
* brief Setup capture of the counter value on trigger of a selected event
*
* param base SCTimer peripheral base address
* param whichCounter SCTimer counter to use when operating in 16-bit mode. In 32-bit mode, this
* field has no meaning as only the Counter_L bits are used.
* param captureRegister Pointer to a variable where the capture register number will be returned. User
* can read the captured value from this register when the specified event is triggered.
* param event Event number that will trigger the capture
*
* return kStatus_Success on success
* kStatus_Error if we have hit the limit in terms of number of match/capture registers available
*/
status_t SCTIMER_SetupCaptureAction(SCT_Type *base,
sctimer_counter_t whichCounter,
uint32_t *captureRegister,
uint32_t event)
{
/* Return an error if we have hit the limit in terms of number of capture/match registers used */
if (s_currentMatch >= FSL_FEATURE_SCT_NUMBER_OF_MATCH_CAPTURE)
{
return kStatus_Fail;
}
/* Use Counter_L bits if counter is operating in 32-bit mode or user wants to setup the L counter */
if ((base->CONFIG & SCT_CONFIG_UNIFY_MASK) || (whichCounter == kSCTIMER_Counter_L))
{
/* Set the bit to enable event */
base->CAPCTRL[s_currentMatch] |= SCT_CAPCTRL_CAPCONn_L(1 << event);
/* Set this resource to be a capture rather than match */
base->REGMODE |= SCT_REGMODE_REGMOD_L(1 << s_currentMatch);
}
else
{
/* Set bit to enable event */
base->CAPCTRL[s_currentMatch] |= SCT_CAPCTRL_CAPCONn_H(1 << event);
/* Set this resource to be a capture rather than match */
base->REGMODE |= SCT_REGMODE_REGMOD_H(1 << s_currentMatch);
}
/* Return the match register number */
*captureRegister = s_currentMatch;
/* Increase the match register number */
s_currentMatch++;
return kStatus_Success;
}
/*!
* brief Receive noticification when the event trigger an interrupt.
*
* If the interrupt for the event is enabled by the user, then a callback can be registered
* which will be invoked when the event is triggered
*
* param base SCTimer peripheral base address
* param event Event number that will trigger the interrupt
* param callback Function to invoke when the event is triggered
*/
void SCTIMER_SetCallback(SCT_Type *base, sctimer_event_callback_t callback, uint32_t event)
{
s_eventCallback[event] = callback;
}
/*!
* brief SCTimer interrupt handler.
*
* param base SCTimer peripheral base address.
*/
void SCTIMER_EventHandleIRQ(SCT_Type *base)
{
uint32_t eventFlag = SCT0->EVFLAG;
/* Only clear the flags whose interrupt field is enabled */
uint32_t clearFlag = (eventFlag & SCT0->EVEN);
uint32_t mask = eventFlag;
int i = 0;
/* Invoke the callback for certain events */
for (i = 0; (i < FSL_FEATURE_SCT_NUMBER_OF_EVENTS) && (mask != 0); i++)
{
if (mask & 0x1)
{
if (s_eventCallback[i] != NULL)
{
s_eventCallback[i]();
}
}
mask >>= 1;
}
/* Clear event interrupt flag */
SCT0->EVFLAG = clearFlag;
}
void SCT0_DriverIRQHandler(void)
{
s_sctimerIsr(SCT0);
/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
__DSB();
#endif
}
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