timers.c

Stellaris公司推出1美元ARM,这是Stellaris驱动库源程序

//*****************************************************************************
//
// timers.c - Timers example.
//
// Copyright (c) 2005,2006 Luminary Micro, Inc.  All rights reserved.
//
// Software License Agreement
//
// Luminary Micro, Inc. (LMI) is supplying this software for use solely and
// exclusively on LMI's Stellaris Family of microcontroller products.
//
// The software is owned by LMI and/or its suppliers, and is protected under
// applicable copyright laws.  All rights are reserved.  Any use in violation
// of the foregoing restrictions may subject the user to criminal sanctions
// under applicable laws, as well as to civil liability for the breach of the
// terms and conditions of this license.
//
// THIS SOFTWARE IS PROVIDED "AS IS".  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.
// LMI SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
// CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
//
// This is part of revision 920 of the Stellaris Driver Library.
//
//*****************************************************************************

#include "../../hw_ints.h"
#include "../../hw_memmap.h"
#include "../../hw_types.h"
#include "../../src/debug.h"
#include "../../src/interrupt.h"
#include "../../src/sysctl.h"
#include "../../src/timer.h"
#include "../osram96x16.h"

//*****************************************************************************
//
//! \addtogroup ev_lm3s811_list
//! <h1>Timer (timers)</h1>
//!
//! This example application demonstrates the use of the timers to generate
//! periodic interrupts.  One timer is set up to interrupt once per second and
//! the other to interrupt twice per second; each interrupt handler will toggle
//! its own indicator on the display.
//
//*****************************************************************************

//*****************************************************************************
//
// Flags that contain the current value of the interrupt indicator as displayed
// on the OLED display.
//
//*****************************************************************************
unsigned long g_ulFlags;

//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, unsigned long ulLine)
{
}
#endif

//*****************************************************************************
//
// The interrupt handler for the first timer interrupt.
//
//*****************************************************************************
void
Timer0IntHandler(void)
{
    //
    // Clear the timer interrupt.
    //
    TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);

    //
    // Toggle the flag for the first timer.
    //
    HWREGBITW(&g_ulFlags, 0) ^= 1;

    //
    // Update the interrupt status on the display.
    //
    IntMasterDisable();
    OSRAMStringDraw(HWREGBITW(&g_ulFlags, 0) ? "1" : "0", 36, 1);
    IntMasterEnable();
}

//*****************************************************************************
//
// The interrupt handler for the second timer interrupt.
//
//*****************************************************************************
void
Timer1IntHandler(void)
{
    //
    // Clear the timer interrupt.
    //
    TimerIntClear(TIMER1_BASE, TIMER_TIMA_TIMEOUT);

    //
    // Toggle the flag for the second timer.
    //
    HWREGBITW(&g_ulFlags, 1) ^= 1;

    //
    // Update the interrupt status on the display.
    //
    IntMasterDisable();
    OSRAMStringDraw(HWREGBITW(&g_ulFlags, 1) ? "1" : "0", 78, 1);
    IntMasterEnable();
}

//*****************************************************************************
//
// This example demonstrates how to setup an analog comparator and trigger
// interrupts on output changes.
//
//*****************************************************************************
int
main(void)
{
    //
    // Set the clocking to run directly from the crystal.
    //
    SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
                   SYSCTL_XTAL_6MHZ);

    //
    // Initialize the OLED display and write status.
    //
    OSRAMInit(false);
    OSRAMStringDraw("Timers example", 6, 0);
    OSRAMStringDraw("T1: 0  T2: 0", 12, 1);

    //
    // Enable the peripherals used by this example.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);

    //
    // Enable processor interrupts.
    //
    IntMasterEnable();

    //
    // Configure the two 32-bit periodic timers.
    //
    TimerConfigure(TIMER0_BASE, TIMER_CFG_32_BIT_PER);
    TimerConfigure(TIMER1_BASE, TIMER_CFG_32_BIT_PER);
    TimerLoadSet(TIMER0_BASE, TIMER_A, SysCtlClockGet());
    TimerLoadSet(TIMER1_BASE, TIMER_A, SysCtlClockGet() / 2);

    //
    // Setup the interrupts for the timer timeouts.
    //
    IntEnable(INT_TIMER0A);
    IntEnable(INT_TIMER1A);
    TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
    TimerIntEnable(TIMER1_BASE, TIMER_TIMA_TIMEOUT);

    //
    // Enable the timers.
    //
    TimerEnable(TIMER0_BASE, TIMER_A);
    TimerEnable(TIMER1_BASE, TIMER_A);

    //
    // Loop forever while the timers run.
    //
    while(1)
    {
    }
}