boot_demo1.c

最新版IAR FOR ARM（EWARM）5.11中的代码例子

//*****************************************************************************
//
// boot_demo1.c - First boot loader example.
//
// Copyright (c) 2007 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 microcontroller products.
// 
// The software is owned by LMI and/or its suppliers, and is protected under
// applicable copyright laws.  All rights are reserved.  You may not combine
// this software with "viral" open-source software in order to form a larger
// program.  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 1952 of the Stellaris Peripheral Driver Library.
//
//*****************************************************************************

#include "../../../hw_memmap.h"
#include "../../../hw_types.h"
#include "../../../src/debug.h"
#include "../../../src/gpio.h"
#include "../../../src/sysctl.h"
#include "../../../src/uart.h"
#include "../rit128x96x4.h"

//*****************************************************************************
//
//! \addtogroup ek_lm3s6965_revc_list
//! <h1>Boot Loader Demo 1 (boot_demo1)</h1>
//!
//! An example to demonstrate the use of the boot loader.  After being started
//! by the boot loader, the application will configure the UART and branch back
//! to the boot loader to await the start of an update.  The UART will always
//! be configured at 115,200 baud and does not require the use of auto-bauding.
//!
//! Both the boot loader and the application must be placed into flash.  Once
//! the boot loader is in flash, it can be used to program the application into
//! flash as well.  Then, the boot loader can be used to replace the
//! application with another.
//!
//! The boot_demo2 application can be used along with this application to
//! easily demonstrate that the boot loader is actually updating the on-chip
//! flash.
//
//*****************************************************************************

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

//*****************************************************************************
//
// Demonstrate the use of the boot loader.
//
//*****************************************************************************
int
main(void)
{
    //
    // Set the clocking to run directly from the crystal.
    //
    SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
                   SYSCTL_XTAL_8MHZ);

    //
    // Enable the UART and GPIO modules.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);

    //
    // Make the UART pins be peripheral controlled.
    //
    GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

    //
    // Configure the UART for 115,200, 8-N-1 operation.
    //
    UARTConfigSetExpClk(UART0_BASE, 8000000, 115200,
                        (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
                         UART_CONFIG_PAR_NONE));

    //
    // Initialize the OLED display.
    //
    RIT128x96x4Init(1000000);

    //
    // Indicate what is happening.
    //
    RIT128x96x4StringDraw("Boot Loader Demo One", 4, 20, 15);
    RIT128x96x4StringDraw("The boot loader is", 10, 36, 15);
    RIT128x96x4StringDraw("now running and", 18, 44, 15);
    RIT128x96x4StringDraw("awaiting an update", 10, 52, 15);
    RIT128x96x4StringDraw("over UART0 at", 24, 60, 15);
    RIT128x96x4StringDraw("115,200, 8-N-1.", 18, 68, 15);

    //
    // Call the boot loader so that it will listen for an update on the UART.
    //
    (*((void (*)(void))(*(unsigned long *)0x2c)))();
}