Timer.h

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/*
 * Copyright (c) 2016-2020, Texas Instruments Incorporated
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/*!*****************************************************************************
 *  @file       Timer.h
 *  @brief      Timer driver
 *
 *  @anchor ti_drivers_Timer_Overview
 *  # Overview
 *  The timer driver allows you to measure elapsed time with simple and
 *  portable APIs.This driver does not have PWM or capture functionalities.
 *  These functionalities are addressed in both the capture and PWM driver.
 *
 *  The timer driver also handles the general purpose timer resource allocation.
 *  For each driver that requires use of a general purpose timer, it calls
 *  Timer_open() to occupy the specified timer, and calls Timer_close() to
 *  release the occupied timer resource.
 *
 *  @anchor ti_drivers_Timer_Usage
 *  # Usage
 *
 *  This documentation provides a basic @ref ti_drivers_Timer_Synopsis
 *  "usage summary" and a set of @ref ti_drivers_Timer_Examples "examples"
 *  in the form of commented code fragments. Detailed descriptions of the
 *  APIs are provided in subsequent sections.
 *
 *  @anchor ti_drivers_Timer_Synopsis
 *  ## Synopsis
 *  @anchor ti_drivers_Timer_Synopsis_Code
 *  @code
 *  // Import Timer Driver definitions
 *  #include <ti/drivers/Timer.h>
 *
 *  Timer_Handle    handle;
 *  Timer_Params    params;
 *
 *  Timer_Params_init(&params);
 *  params.periodUnits = Timer_PERIOD_HZ;
 *  params.period = 1000;
 *  params.timerMode  = Timer_CONTINUOUS_CALLBACK;
 *  params.timerCallback = UserCallbackFunction;
 *
 *  handle = Timer_open(CONFIG_TIMER0, &params);
 *
 *  @code
 *  // Import Timer Driver definitions
 *  #include <ti/drivers/Timer.h>
 *
 *  Timer_Handle    handle;
 *  Timer_Params    params;
 *
 *  // Initialize Timer parameters
 *  Timer_Params_init(&params);
 *  params.periodUnits = Timer_PERIOD_HZ;
 *  params.period = 1000;
 *  params.timerMode  = Timer_CONTINUOUS_CALLBACK;
 *  params.timerCallback = UserCallbackFunction;
 *
 *  // Open Timer instance
 *  handle = Timer_open(CONFIG_TIMER0, &params);
 *
 *  sleep(10000);
 *
 *  Timer_stop(handle);
 *  @endcode
 *
 *  <hr>
 *  @anchor ti_drivers_Timer_Examples
 *  # Examples
 *
 *  @li @ref ti_drivers_Timer_Examples_open "Opening a Timer Instance"
 *  @li @ref ti_drivers_Timer_Examples_mode "Configuring Timer mode and period"
 *
 *  @anchor ti_drivers_Timer_Examples_open
 *  ## Opening a Timer instance
 *
 *  @code
 *  Timer_Handle    handle;
 *  Timer_Params    params;
 *
 *  Timer_Params_init(&params);
 *  handle = Timer_open(CONFIG_TIMER0, &params);
 *
 *  if (handle == NULL) {
 *      // Timer_open() failed
 *      while (1);
 *  }
 @endcode
 *
 *  @anchor ti_drivers_Timer_Examples_mode
 *  ##Configuring Timer mode and period
 *
 *  The following example code opens a timer in continuous callback mode. The
 *  period is set to 1000 Hz.
 *
 *  @code
 *  Timer_Handle    handle;
 *  Timer_Params    params;
 *
 *  Timer_Params_init(&params);
 *  params.periodUnits = Timer_PERIOD_HZ;
 *  params.period = 1000;
 *  params.timerMode  = Timer_CONTINUOUS_CALLBACK;
 *  params.timerCallback = UserCallbackFunction;
 *
 *  handle = Timer_open(CONFIG_TIMER0, &params);
 *
 *  if (handle == NULL) {
 *      // Timer_open() failed
 *      while (1);
 *  }
 *
 *  status = Timer_start(handle);
 *
 *  if (status == Timer_STATUS_ERROR) {
 *      //Timer_start() failed
 *      while (1);
 *  }
 *
 *  sleep(10000);
 *
 *  Timer_stop(handle);
 *  @endcode
 *
 *  ### Initializing the Timer Driver #
 *
 *  Timer_init() must be called before any other timer APIs. This function
 *  calls the device implementation's timer initialization function, for each
 *  element of Timer_config[].
 *
 *  <hr>
 *  @anchor ti_drivers_Timer_Configuration
 *  # Configuration
 *
 *  Refer to the @ref driver_configuration "Driver's Configuration" section
 *  for driver configuration information.
 *  <hr>
*******************************************************************************
 */

#ifndef ti_drivers_Timer__include
#define ti_drivers_Timer__include

#include <stdint.h>

#include <ti/drivers/dpl/HwiP.h>
#include <ti/drivers/dpl/SemaphoreP.h>
#include <ti/drivers/Power.h>

#ifdef __cplusplus
extern "C"
{
#endif

#define Timer_CMD_RESERVED                (32)

#define Timer_STATUS_RESERVED            (-32)

#define Timer_STATUS_SUCCESS               (0)

#define Timer_STATUS_ERROR                (-1)

#define Timer_STATUS_UNDEFINEDCMD         (-2)

typedef struct Timer_Config_ *Timer_Handle;

typedef enum {
    Timer_ONESHOT_CALLBACK,       
    Timer_ONESHOT_BLOCKING,       
    Timer_CONTINUOUS_CALLBACK,    
    Timer_FREE_RUNNING            
} Timer_Mode;

typedef enum {
    Timer_PERIOD_US,      
    Timer_PERIOD_HZ,      
    Timer_PERIOD_COUNTS   
} Timer_PeriodUnits;

typedef void (*Timer_CallBackFxn)(Timer_Handle handle, int_fast16_t status);

typedef struct {
    Timer_Mode           timerMode;

    Timer_PeriodUnits    periodUnits;

    Timer_CallBackFxn    timerCallback;

    uint32_t             period;
} Timer_Params;

#define TIMER_BASE_OBJECT \
    /* Timer control variables */ \
    Timer_Mode                 mode;         /* Blocking or Callback mode */ \
    Timer_CallBackFxn          callBack;     /* Callback function pointer */ \
    Power_NotifyObj            notifyObj;    /* Ptr to current I2C transaction */ \
    uint32_t                   timer; \
    uint32_t                   period; \
    uint32_t                   prescaler; \
    \
    /* Timer RTOS objects */ \
    HwiP_Handle                hwiHandle;    /* Hwi object handle */ \
    SemaphoreP_Struct          semStruct;    /* Grants exclusive access to I2C */ \
    SemaphoreP_Handle          semHandle;    /* Signal I2C transfer complete */ \
    \
    bool                       isRunning;    /* Flag to show module is open */ \

typedef struct {
    TIMER_BASE_OBJECT
} Timer_Object;
#define TIMER_BASE_HWATTRS \
 \
    uint32_t baseAddress; \
 \
    uint32_t intNum; \
 \
    uint32_t intPriority;

typedef struct {
    TIMER_BASE_HWATTRS
} Timer_HWAttrs;
typedef struct Timer_Config_ {
    void                 *object;

    void           const *hwAttrs;
} Timer_Config;

extern const Timer_Config Timer_config[];
extern void Timer_close(Timer_Handle handle);

extern int_fast16_t Timer_control(Timer_Handle handle, uint_fast16_t cmd,
    void *arg);

extern uint32_t Timer_getCount(Timer_Handle handle);


extern void Timer_init(void);

extern Timer_Handle Timer_open(uint_least8_t index, Timer_Params *params);

extern int32_t Timer_setPeriod(Timer_Handle handle, Timer_PeriodUnits periodUnits, uint32_t period);

extern void Timer_Params_init(Timer_Params *params);

extern int32_t Timer_start(Timer_Handle handle);

extern void Timer_stop(Timer_Handle handle);

#ifdef __cplusplus
}
#endif

#endif /* ti_drivers_Timer__include */