/****************************************************************************
* arch/arm/src/tiva/tiva_timer.h
*
* Copyright (C) 201r Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __ARCH_ARM_SRC_TIVA_TIVA_TIMER_H
#define __ARCH_ARM_SRC_TIVA_TIVA_TIMER_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <arch/tiva/chip.h>
#include "chip/tiva_timer.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Make sure that no timers are enabled that are not supported by the
* architecture.
*/
#if TIVA_NTIMERS < 8
# undef CONFIG_TIVA_TIMER7
# if TIVA_NTIMERS < 7
# undef CONFIG_TIVA_TIMER6
# if TIVA_NTIMERS < 6
# undef CONFIG_TIVA_TIMER5
# if TIVA_NTIMERS < 5
# undef CONFIG_TIVA_TIMER4
# if TIVA_NTIMERS < 4
# undef CONFIG_TIVA_TIMER3
# if TIVA_NTIMERS < 3
# undef CONFIG_TIVA_TIMER2
# if TIVA_NTIMERS < 2
# undef CONFIG_TIVA_TIMER1
# if TIVA_NTIMERS < 1
# undef CONFIG_TIVA_TIMER0
# endif
# endif
# endif
# endif
# endif
# endif
# endif
#endif
/* Used with the synca and syncb fields of struct tiva_timerconfig_s */
#define TIMER_SYNC(n) (1 << (n))
/* Identifies 16-bit timer A and timer B. In most cases, the 32-bit timer
* is equivalent to timer a.
*/
#define TIMER32 0
#define TIMER16A 0
#define TIMER16B 1
/****************************************************************************
* Public Types
****************************************************************************/
/* This enumeration identifies all supported 32-bit timer modes of operation */
enum tiva_timer32mode_e
{
TIMER16_MODE = 0, /* Use 16-bit timers, not 32-bit timer */
TIMER32_MODE_ONESHOT, /* 32-bit programmable one-shot timer */
TIMER32_MODE_PERIODIC, /* 32-bit programmable periodic timer */
TIMER32_MODE_RTC /* 32-bit RTC with external 32.768-KHz input */
};
/* This enumeration identifies all supported 16-bit timer A/Bmodes of
* operation.
*/
enum tiva_timer16mode_e
{
TIMER16_MODE_NONE = 0, /* 16-bit timer not used */
TIMER16_MODE_ONESHOT, /* 16-bit programmable one-shot timer */
TIMER16_MODE_PERIODIC, /* 16-bit programmable periodic timer */
TIMER16_MODE_COUNT_CAPTURE, /* 16-bit input edge-count capture mode w/8-bit prescaler */
TIMER16_MODE_TIME_CAPTURE, /* 16-bit input time capture mode w/8-bit prescaler */
TIMER16_MODE_PWM /* 16-bit PWM output mode w/8-bit prescaler */
};
/* This type represents the opaque handler returned by tiva_gptm_configure() */
typedef FAR void *TIMER_HANDLE;
/* This type describes the 32-bit timer interrupt handler */
struct tiva_gptm32config_s;
typedef void (*timer32_handler_t)(TIMER_HANDLE handle,
const struct tiva_gptm32config_s *config);
/* This structure describes the configuration of one 32-bit timer */
struct tiva_timer32config_s
{
bool down; /* False: Count up; True: Count down */
timer32_handler_t handler; /* Non-NULL: Interrupts will be enabled
* and forwarded to this function */
/* TODO: Add fields to support ADC trigger events */
/* Mode-specific parameters */
union
{
/* 32-bit programmable one-shot or periodic timer */
struct
{
uint32_t interval; /* Value for interval load register */
} periodic;
/* 32-bit RTC with external 32.768-KHz input */
struct
{
} rtc;
} u;
};
/* This type describes the 16-bit timer interrupt handler */
struct tiva_gptm16config_s;
typedef void (*timer16_handler_t)(TIMER_HANDLE handle,
const struct tiva_gptm16config_s *config,
int tmndx);
/* This structure describes the configuration of one 16-bit timer A/B */
struct tiva_timer16config_s
{
uint8_t mode; /* See enum tiva_timermode_e */
bool down; /* False: Count up; True: Count down */
timer16_handler_t handler; /* Non-NULL: Interrupts will be enabled
* and forwarded to this function */
/* TODO: Add fields to support ADC trigger events */
/* Mode-specific parameters */
union
{
/* 16-bit programmable one-shot or periodic timer */
struct
{
uint16_t interval; /* Value for interval load register */
} periodic;
/* 16-bit input edge-count capture mode w/8-bit prescaler */
struct
{
} count;
/* 16-bit input time capture mode w/8-bit prescaler */
struct
{
} time;
/* 16-bit PWM output mode w/8-bit prescaler */
struct
{
} pwm;
} u;
};
/* This structure describes usage of both timers on a GPTIM module */
struct tiva_gptmconfig_s
{
uint8_t gptm; /* GPTM number */
uint8_t mode; /* See enum tiva_timer32mode_e */
uint8_t alternate; /* False: Use SysClk; True: Use alternate clock source */
uint32_t frequency; /* Frequency of the selected clock source */
};
/* This structure is cast compatible with struct tiva_gptmconfig_s and
* describes usage of the single 32-bit timers on a GPTM module.
*/
struct tiva_gptm32config_s
{
struct tiva_gptmconfig_s cmn;
struct tiva_timer32config_s config;
};
/* This structure is cast compatible with struct tiva_gptmconfig_s and
* describes usage of both bit-bit timers A/B on a GPTM module.
*/
struct tiva_gptm16config_s
{
struct tiva_gptmconfig_s cmn;
struct tiva_timer16config_s config[2];
};
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tiva_gptm_configure
*
* Description:
* Configure a general purpose timer module to operate in the provided
* modes.
*
****************************************************************************/
TIMER_HANDLE tiva_gptm_configure(const struct tiva_gptmconfig_s *gptm);
/****************************************************************************
* Name: tiva_gptm_putreg
*
* Description:
* This function permits setting of any timer register by its offset into
* the timer block. Its primary purpose is to support inline functions
* defined in this header file.
*
****************************************************************************/
void tiva_gptm_putreg(TIMER_HANDLE handle, unsigned int offset, uint32_t value);
/****************************************************************************
* Name: tiva_gptm_getreg
*
* Description:
* This function permits reading of any timer register by its offset into
* the timer block. Its primary purpose is to support inline functions
* defined in this header file.
*
****************************************************************************/
uint32_t tiva_gptm_getreg(TIMER_HANDLE handle, unsigned int offset);
/****************************************************************************
* Name: tiva_gptm_modifyreg
*
* Description:
* This function permits atomic of any timer register by its offset into
* the timer block. Its primary purpose is to support inline functions
* defined in this header file.
*
****************************************************************************/
void tiva_gptm_modifyreg(TIMER_HANDLE handle, unsigned int offset,
uint32_t clrbits, uint32_t setbits);
/****************************************************************************
* Name: tiva_timer32_start
*
* Description:
* After tiva_gptm_configure() has been called to configure a 32-bit timer,
* this function must be called to start the timer(s).
*
****************************************************************************/
static inline void tiva_timer32_start(TIMER_HANDLE handle)
{
/* Set the TAEN bit in the GPTMCTL register to enable the timer and start
* counting
*/
tiva_gptm_modifyreg(handle, TIVA_TIMER_CTL_OFFSET, 0, TIMER_CTL_TAEN);
}
/****************************************************************************
* Name: tiva_timer16_start
*
* Description:
* After tiva_gptm_configure() has been called to configure 16-bit timer(s),
* this function must be called to start one 16-bit timer.
*
****************************************************************************/
static inline void tiva_timer16_start(TIMER_HANDLE handle, int tmndx)
{
uint32_t setbits = tmndx ? TIMER_CTL_TBEN : TIMER_CTL_TAEN;
/* Set the TnEN bit in the GPTMCTL register to enable the timer and start
* counting
*/
tiva_gptm_modifyreg(handle, TIVA_TIMER_CTL_OFFSET, 0, setbits);
}
/****************************************************************************
* Name: tiva_timer32_stop
*
* Description:
* After tiva_timer32_start() has been called to start a 32-bit timer,
* this function may be called to stop the timer.
*
****************************************************************************/
static inline void tiva_timer32_stop(TIMER_HANDLE handle)
{
/* Clear the TAEN bit in the GPTMCTL register to enable the timer and
* start counting
*/
tiva_gptm_modifyreg(handle, TIVA_TIMER_CTL_OFFSET, TIMER_CTL_TAEN, 0);
}
/****************************************************************************
* Name: tiva_timer16_stop
*
* Description:
* After tiva_timer32_start() has been called to start a 16-bit timer,
* this function may be called to stop the timer.
*
****************************************************************************/
static inline void tiva_timer16_stop(TIMER_HANDLE handle, int tmndx)
{
uint32_t clrbits = tmndx ? TIMER_CTL_TBEN : TIMER_CTL_TAEN;
/* Clear the TAEN bit in the GPTMCTL register to enable the timer and
* start counting
*/
tiva_gptm_modifyreg(handle, TIVA_TIMER_CTL_OFFSET, clrbits, 0);
}
/****************************************************************************
* Name: tiva_timer32_setload
*
* Description:
* This function may be called at any time to change the timer interval
* load value of a 32-bit timer.
*
****************************************************************************/
static inline void tiva_timer32_setload(TIMER_HANDLE handle, uint32_t load)
{
tiva_gptm_putreg(handle, TIVA_TIMER_TAILR_OFFSET, load);
}
/****************************************************************************
* Name: tiva_timer16_setload
*
* Description:
* This function may be called at any time to change the timer interval
* load value of a 16-bit timer.
*
****************************************************************************/
static inline void tiva_timer16_setload(TIMER_HANDLE handle, uint16_t load,
int tmndx)
{
unsigned int regoffset =
tmndx ? TIVA_TIMER_TBILR_OFFSET : TIVA_TIMER_TAILR_OFFSET;
tiva_gptm_putreg(handle, regoffset, load);
}
/****************************************************************************
* Name: tiva_gptm0_synchronize
*
* Description:
* Trigger timers from GPTM0 output.
*
****************************************************************************/
static inline void tiva_gptm0_synchronize(uint32_t sync)
{
putreg32(sync, TIVA_TIMER0_SYNC);
}
#endif /* __ARCH_ARM_SRC_TIVA_TIVA_TIMER_H */
