/*
*********************************************************************************************************
* uC/CPU
* CPU CONFIGURATION & PORT LAYER
*
* Copyright 2004-2020 Silicon Laboratories Inc. www.silabs.com
*
* SPDX-License-Identifier: APACHE-2.0
*
* This software is subject to an open source license and is distributed by
* Silicon Laboratories Inc. pursuant to the terms of the Apache License,
* Version 2.0 available at www.apache.org/licenses/LICENSE-2.0.
*
*********************************************************************************************************
*/
/*
*********************************************************************************************************
*
* CPU BOARD SUPPORT PACKAGE (BSP) FUNCTIONS
*
* TEMPLATE
*
* Filename : bsp_cpu.c
* Version : v1.32.00
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* INCLUDE FILES
*********************************************************************************************************
*/
#define CPU_BSP_MODULE
#include <cpu_core.h>
#include "bsp_clk.h"
/*
*********************************************************************************************************
* LOCAL DEFINES
*********************************************************************************************************
*/
#define CPU_BSP_REG_DEMCR (*(CPU_REG32 *)(0xE000EDFCu))
#define CPU_BSP_REG_DWT_CR (*(CPU_REG32 *)(0xE0001000u))
#define CPU_BSP_REG_DWT_CYCCNT (*(CPU_REG32 *)(0xE0001004u))
#define CPU_BSP_REG_DWT_LAR (*(CPU_REG32 *)(0xE0001FB0u))
#define CPU_BSP_REG_DWT_LSR (*(CPU_REG32 *)(0xE0001FB4u))
#define CPU_BSP_BIT_DWT_LSR_SLK DEF_BIT_01
#define CPU_BSP_BIT_DWT_LSR_SLI DEF_BIT_00
#define CPU_BSP_DWT_LAR_KEY 0xC5ACCE55u
/*
*********************************************************************************************************
* LOCAL CONSTANTS
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL DATA TYPES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL TABLES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL GLOBAL VARIABLES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL FUNCTION PROTOTYPES
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* LOCAL CONFIGURATION ERRORS
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* 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;
CPU_INT32U reg_val;
/* ---- DWT WRITE ACCESS UNLOCK (CORTEX-M7 ONLY!!) ---- */
reg_val = CPU_BSP_REG_DWT_LSR; /* Read lock status register. */
if ((reg_val & CPU_BSP_BIT_DWT_LSR_SLI) != 0) { /* Check if Software lock control mechanism exits */
if ((reg_val & CPU_BSP_BIT_DWT_LSR_SLK) != 0) { /* Check if DWT access needs to be unlocked */
CPU_BSP_REG_DWT_LAR = CPU_BSP_DWT_LAR_KEY; /* Unlock DWT write access. */
}
}
fclk_freq = BSP_ClkFreqGet(CLK_ID_SYSCLK);
CPU_BSP_REG_DEMCR |= DEF_BIT_24; /* Set DEM_CR_TRCENA */
CPU_BSP_REG_DWT_CR |= DEF_BIT_00; /* Set DWT_CR_CYCCNTENA */
CPU_TS_TmrFreqSet((CPU_TS_TMR_FREQ)fclk_freq);
}
#endif
/*
*********************************************************************************************************
* 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)CPU_BSP_REG_DWT_CYCCNT; /* Read the timer count register */
return (ts_tmr_cnts);
}
#endif
/*
*********************************************************************************************************
* 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 programming 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)
{
CPU_INT64U ts_us;
CPU_INT64U fclk_freq;
fclk_freq = BSP_ClkFreqGet(CLK_ID_SYSCLK);
ts_us = ts_cnts / (fclk_freq / DEF_TIME_NBR_uS_PER_SEC);
return (ts_us);
}
#endif
#if (CPU_CFG_TS_64_EN == DEF_ENABLED)
CPU_INT64U CPU_TS64_to_uSec (CPU_TS64 ts_cnts)
{
CPU_INT64U ts_us;
CPU_INT64U fclk_freq;
fclk_freq = BSP_ClkFreqGet(CLK_ID_SYSCLK);
ts_us = ts_cnts / (fclk_freq / DEF_TIME_NBR_uS_PER_SEC);
return (ts_us);
}
#endif