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//*****************************************************************************
//
// cpu_usage.c - Routines to determine the CPU utilization.
//
// Copyright (c) 2007-2014 Texas Instruments Incorporated. All rights reserved.
// Software License Agreement
//
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
//
// This is part of revision 2.1.0.12573 of the Tiva Utility Library.
//
//*****************************************************************************
#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/rom.h"
#include "driverlib/rom_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/timer.h"
#include "utils/cpu_usage.h"
//*****************************************************************************
//
//! \addtogroup cpu_usage_api
//! @{
//
//*****************************************************************************
//*****************************************************************************
//
// The peripheral identifier for the timer modules that could be used for
// tracking CPU utilization.
//
//*****************************************************************************
static uint32_t g_pui32CPUUsageTimerPeriph[6] =
{
SYSCTL_PERIPH_TIMER0, SYSCTL_PERIPH_TIMER1, SYSCTL_PERIPH_TIMER2,
SYSCTL_PERIPH_TIMER3, SYSCTL_PERIPH_TIMER4, SYSCTL_PERIPH_TIMER5
};
//*****************************************************************************
//
// The base address of the timer modules that could be used for tracking CPU
// utilization.
//
//*****************************************************************************
static uint32_t g_pui32CPUUsageTimerBase[6] =
{
TIMER0_BASE, TIMER1_BASE, TIMER2_BASE, TIMER3_BASE, TIMER4_BASE,
TIMER5_BASE
};
//*****************************************************************************
//
// The index of the timer module that will be used for tracking CPU
// utilization.
//
//*****************************************************************************
static uint32_t g_ui32CPUUsageTimer;
//*****************************************************************************
//
// The number of processor clock ticks per timing period.
//
//*****************************************************************************
static uint32_t g_ui32CPUUsageTicks;
//*****************************************************************************
//
// The value of timer two on the previous timing period. This is used to
// determine the number of clock ticks counted by the timer during the timing
// period.
//
//*****************************************************************************
static uint32_t g_ui32CPUUsagePrevious;
//*****************************************************************************
//
//! Updates the CPU usage for the new timing period.
//!
//! This function, when called at the end of a timing period, will update the
//! CPU usage.
//!
//! \return Returns the CPU usage percentage as a 16.16 fixed-point value.
//
//*****************************************************************************
uint32_t
CPUUsageTick(void)
{
uint32_t ui32Value, ui32Usage;
//
// Get the current value of the timer.
//
ui32Value =
MAP_TimerValueGet(g_pui32CPUUsageTimerBase[g_ui32CPUUsageTimer],
TIMER_A);
//
// Based on the number of clock ticks accumulated by the timer during the
// previous timing period, compute the CPU usage as a 16.16 fixed-point
// value.
//
ui32Usage = ((((g_ui32CPUUsagePrevious - ui32Value) * 6400) /
g_ui32CPUUsageTicks) * 1024);
//
// Save the previous value of the timer.
//
g_ui32CPUUsagePrevious = ui32Value;
//
// Return the new CPU usage value.
//
return(ui32Usage);
}
//*****************************************************************************
//
//! Initializes the CPU usage measurement module.
//!
//! \param ui32ClockRate is the rate of the clock supplied to the timer module.
//! \param ui32Rate is the number of times per second that CPUUsageTick() is
//! called.
//! \param ui32Timer is the index of the timer module to use.
//!
//! This function prepares the CPU usage measurement module for measuring the
//! CPU usage of the application.
//!
//! \return None.
//
//*****************************************************************************
void
CPUUsageInit(uint32_t ui32ClockRate, uint32_t ui32Rate, uint32_t ui32Timer)
{
//
// Check the arguments.
//
ASSERT(ui32ClockRate > ui32Rate);
ASSERT(ui32Timer < 6);
//
// Save the timer index.
//
g_ui32CPUUsageTimer = ui32Timer;
//
// Determine the number of system clocks per measurement period.
//
g_ui32CPUUsageTicks = ui32ClockRate / ui32Rate;
//
// Set the previous value of the timer to the initial timer value.
//
g_ui32CPUUsagePrevious = 0xffffffff;
//
// Enable peripheral clock gating.
//
MAP_SysCtlPeripheralClockGating(true);
//
// Enable the third timer while the processor is in run mode, but disable
// it in sleep mode. It will therefore count system clocks when the
// processor is running but not when it is sleeping.
//
MAP_SysCtlPeripheralEnable(g_pui32CPUUsageTimerPeriph[ui32Timer]);
MAP_SysCtlPeripheralSleepDisable(g_pui32CPUUsageTimerPeriph[ui32Timer]);
//
// Configure the third timer for 32-bit periodic operation.
//
MAP_TimerConfigure(g_pui32CPUUsageTimerBase[ui32Timer],
TIMER_CFG_PERIODIC);
//
// Set the load value for the third timer to the maximum value.
//
MAP_TimerLoadSet(g_pui32CPUUsageTimerBase[ui32Timer], TIMER_A, 0xffffffff);
//
// Enable the third timer. It will now count the number of system clocks
// during which the processor is executing code.
//
MAP_TimerEnable(g_pui32CPUUsageTimerBase[ui32Timer], TIMER_A);
}
//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************
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