/*
*********************************************************************************************************
*                                                uC/CPU
*                                    CPU CONFIGURATION & PORT LAYER
*
*                          (c) Copyright 2004-2010; Micrium, Inc.; Weston, FL
*
*               All rights reserved.  Protected by international copyright laws.
*
*               uC/CPU is provided in source form to registered licensees ONLY.  It is 
*               illegal to distribute this source code to any third party unless you receive 
*               written permission by an authorized Micrium representative.  Knowledge of 
*               the source code may NOT be used to develop a similar product.
*
*               Please help us continue to provide the Embedded community with the finest 
*               software available.  Your honesty is greatly appreciated.
*
*               You can contact us at www.micrium.com.
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*
*                               CPU BOARD SUPPORT PACKAGE (BSP) FUNCTIONS
*
*                                       KEIL MCB1700 DEVELOPMENT KIT 
*
* Filename      : cpu_bsp.c
* Version       : V1.25
* Programmer(s) : ITJ
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                            INCLUDE FILES
*********************************************************************************************************
*/

#define    CPU_BSP_MODULE
#include "os.h"
#include "chip.h"

/*$PAGE*/
/*
*********************************************************************************************************
*                                            LOCAL DEFINES
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                           LOCAL CONSTANTS
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                          LOCAL DATA TYPES
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                            LOCAL TABLES
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                       LOCAL GLOBAL VARIABLES
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                      LOCAL FUNCTION PROTOTYPES
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                     LOCAL CONFIGURATION ERRORS
*********************************************************************************************************
*/

void OS_CSP_TickInit(void)
{
	CPU_INT32U  cnts;
	CPU_INT32U  cpu_freq;
    
    
	cpu_freq = (CPU_INT32U) Chip_Clock_GetSystemClockRate();
	cnts     = (cpu_freq / OSCfg_TickRate_Hz);

	OS_CPU_SysTickInit(cnts);
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                          CPU_TS_TmrInit()
*
* Description : Initialize & start CPU timestamp timer.
*
* Argument(s) : none.
*
* Return(s)   : none.
*
* Caller(s)   : CPU_TS_Init().
*
*               This function is an INTERNAL CPU module function & MUST be implemented by application/
*               BSP function(s) [see Note #1] but MUST NOT be called by application function(s).
*
* Note(s)     : (1) CPU_TS_TmrInit() is an application/BSP function that MUST be defined by the developer 
*                   if either of the following CPU features is enabled :
*
*                   (a) CPU timestamps
*                   (b) CPU interrupts disabled time measurements
*
*                   See 'cpu_cfg.h  CPU TIMESTAMP CONFIGURATION  Note #1'
*                     & 'cpu_cfg.h  CPU INTERRUPTS DISABLED TIME MEASUREMENT CONFIGURATION  Note #1a'.
*
*               (2) (a) Timer count values MUST be returned via word-size-configurable 'CPU_TS_TMR' 
*                       data type.
*
*                       (1) If timer has more bits, truncate timer values' higher-order bits greater 
*                           than the configured 'CPU_TS_TMR' timestamp timer data type word size.
*
*                       (2) Since the timer MUST NOT have less bits than the configured 'CPU_TS_TMR' 
*                           timestamp timer data type word size; 'CPU_CFG_TS_TMR_SIZE' MUST be 
*                           configured so that ALL bits in 'CPU_TS_TMR' data type are significant.
*
*                           In other words, if timer size is not a binary-multiple of 8-bit octets 
*                           (e.g. 20-bits or even 24-bits), then the next lower, binary-multiple 
*                           octet word size SHOULD be configured (e.g. to 16-bits).  However, the 
*                           minimum supported word size for CPU timestamp timers is 8-bits.
*
*                       See also 'cpu_cfg.h   CPU TIMESTAMP CONFIGURATION  Note #2'
*                              & 'cpu_core.h  CPU TIMESTAMP DATA TYPES     Note #1'.
*
*                   (b) Timer SHOULD be an 'up'  counter whose values increase with each time count.
*
*                   (c) When applicable, timer period SHOULD be less than the typical measured time 
*                       but MUST be less than the maximum measured time; otherwise, timer resolution 
*                       inadequate to measure desired times.
*
*                   See also 'CPU_TS_TmrRd()  Note #2'.
*********************************************************************************************************
*/

#if (CPU_CFG_TS_TMR_EN == DEF_ENABLED)
void  CPU_TS_TmrInit (void)
{
	CPU_INT32U fclk_freq;

	/* Use timer 0 */
	Chip_TIMER_Init(LPC_TIMER0);

	/* Get timer 0 peripheral clock rate */
#if defined(CHIP_LPC175X_6X)
	fclk_freq = (CPU_INT32U) Chip_Clock_GetPeripheralClockRate(SYSCTL_PCLK_TIMER0);
#else
	fclk_freq = (CPU_INT32U) Chip_Clock_GetPeripheralClockRate();
#endif

	/* Timer will recycle after 1s */
	Chip_TIMER_Reset(LPC_TIMER0);
	Chip_TIMER_SetMatch(LPC_TIMER0, 1, fclk_freq);
	Chip_TIMER_ResetOnMatchEnable(LPC_TIMER0, 1);
	Chip_TIMER_Enable(LPC_TIMER0);

	CPU_TS_TmrFreqSet((CPU_TS_TMR_FREQ) fclk_freq);    
}
#endif


/*$PAGE*/
/*
*********************************************************************************************************
*                                           CPU_TS_TmrRd()
*
* Description : Get current CPU timestamp timer count value.
*
* Argument(s) : none.
*
* Return(s)   : Timestamp timer count (see Notes #2a & #2b).
*
* Caller(s)   : CPU_TS_Init(),
*               CPU_TS_Get32(),
*               CPU_TS_Get64(),
*               CPU_IntDisMeasStart(),
*               CPU_IntDisMeasStop().
*
*               This function is an INTERNAL CPU module function & MUST be implemented by application/
*               BSP function(s) [see Note #1] but SHOULD NOT be called by application function(s).
*
* Note(s)     : (1) CPU_TS_TmrRd() is an application/BSP function that MUST be defined by the developer 
*                   if either of the following CPU features is enabled :
*
*                   (a) CPU timestamps
*                   (b) CPU interrupts disabled time measurements
*
*                   See 'cpu_cfg.h  CPU TIMESTAMP CONFIGURATION  Note #1'
*                     & 'cpu_cfg.h  CPU INTERRUPTS DISABLED TIME MEASUREMENT CONFIGURATION  Note #1a'.
*
*               (2) (a) Timer count values MUST be returned via word-size-configurable 'CPU_TS_TMR' 
*                       data type.
*
*                       (1) If timer has more bits, truncate timer values' higher-order bits greater 
*                           than the configured 'CPU_TS_TMR' timestamp timer data type word size.
*
*                       (2) Since the timer MUST NOT have less bits than the configured 'CPU_TS_TMR' 
*                           timestamp timer data type word size; 'CPU_CFG_TS_TMR_SIZE' MUST be 
*                           configured so that ALL bits in 'CPU_TS_TMR' data type are significant.
*
*                           In other words, if timer size is not a binary-multiple of 8-bit octets 
*                           (e.g. 20-bits or even 24-bits), then the next lower, binary-multiple 
*                           octet word size SHOULD be configured (e.g. to 16-bits).  However, the 
*                           minimum supported word size for CPU timestamp timers is 8-bits.
*
*                       See also 'cpu_cfg.h   CPU TIMESTAMP CONFIGURATION  Note #2'
*                              & 'cpu_core.h  CPU TIMESTAMP DATA TYPES     Note #1'.
*
*                   (b) Timer SHOULD be an 'up'  counter whose values increase with each time count.
*
*                       (1) If timer is a 'down' counter whose values decrease with each time count,
*                           then the returned timer value MUST be ones-complemented.
*
*                   (c) (1) When applicable, the amount of time measured by CPU timestamps is 
*                           calculated by either of the following equations :
*
*                           (A) Time measured  =  Number timer counts  *  Timer period
*
*                                   where
*
*                                       Number timer counts     Number of timer counts measured 
*                                       Timer period            Timer's period in some units of 
*                                                                   (fractional) seconds
*                                       Time measured           Amount of time measured, in same 
*                                                                   units of (fractional) seconds 
*                                                                   as the Timer period
*
*                                                  Number timer counts
*                           (B) Time measured  =  ---------------------
*                                                    Timer frequency
*
*                                   where
*
*                                       Number timer counts     Number of timer counts measured
*                                       Timer frequency         Timer's frequency in some units 
*                                                                   of counts per second
*                                       Time measured           Amount of time measured, in seconds
*
*                       (2) Timer period SHOULD be less than the typical measured time but MUST be less 
*                           than the maximum measured time; otherwise, timer resolution inadequate to 
*                           measure desired times.
*********************************************************************************************************
*/

#if (CPU_CFG_TS_TMR_EN == DEF_ENABLED)
CPU_TS_TMR  CPU_TS_TmrRd (void)
{
    CPU_TS_TMR  ts_tmr_cnts;

    ts_tmr_cnts  = (CPU_TS_TMR) Chip_TIMER_ReadCount(LPC_TIMER0);
    
    return (ts_tmr_cnts);
}
#endif

#if 0
/*$PAGE*/
/*
*********************************************************************************************************
*                                         CPU_TSxx_to_uSec()
*
* Description : Convert a 32-/64-bit CPU timestamp from timer counts to microseconds.
*
* Argument(s) : ts_cnts   CPU timestamp (in timestamp timer counts [see Note #2aA]).
*
* Return(s)   : Converted CPU timestamp (in microseconds           [see Note #2aD]).
*
* Caller(s)   : Application.
*
*               This function is an (optional) CPU module application interface (API) function which 
*               MAY be implemented by application/BSP function(s) [see Note #1] & MAY be called by 
*               application function(s).
*
* Note(s)     : (1) CPU_TS32_to_uSec()/CPU_TS64_to_uSec() are application/BSP functions that MAY be 
*                   optionally defined by the developer when either of the following CPU features is 
*                   enabled :
*
*                   (a) CPU timestamps
*                   (b) CPU interrupts disabled time measurements
*
*                   See 'cpu_cfg.h  CPU TIMESTAMP CONFIGURATION  Note #1'
*                     & 'cpu_cfg.h  CPU INTERRUPTS DISABLED TIME MEASUREMENT CONFIGURATION  Note #1a'.
*
*               (2) (a) The amount of time measured by CPU timestamps is calculated by either of 
*                       the following equations :
*
*                                                                        10^6 microseconds
*                       (1) Time measured  =   Number timer counts   *  -------------------  *  Timer period
*                                                                            1 second
*
*                                              Number timer counts       10^6 microseconds
*                       (2) Time measured  =  ---------------------  *  -------------------
*                                                Timer frequency             1 second
*
*                               where
*
*                                   (A) Number timer counts     Number of timer counts measured
*                                   (B) Timer frequency         Timer's frequency in some units 
*                                                                   of counts per second
*                                   (C) Timer period            Timer's period in some units of 
*                                                                   (fractional)  seconds
*                                   (D) Time measured           Amount of time measured, 
*                                                                   in microseconds
*
*                   (b) Timer period SHOULD be less than the typical measured time but MUST be less 
*                       than the maximum measured time; otherwise, timer resolution inadequate to 
*                       measure desired times.
*
*                   (c) Specific implementations may convert any number of CPU_TS32 or CPU_TS64 bits 
*                       -- up to 32 or 64, respectively -- into microseconds.
*********************************************************************************************************
*/

#if (CPU_CFG_TS_32_EN == DEF_ENABLED)
CPU_INT64U  CPU_TS32_to_uSec (CPU_TS32  ts_cnts)
{

    return (0u);

}
#endif


#if (CPU_CFG_TS_64_EN == DEF_ENABLED)
CPU_INT64U  CPU_TS64_to_uSec (CPU_TS64  ts_cnts)
{

    return (0u);

}
#endif
#endif
