mpc55xx_init_debug.c

mpc55**系列芯片的例程 包括SCI,SPI,TIMER,FIT,EDMA等几乎所有功能的实现

/*
 *
 * FILE : MPC55xx_init_debug.c
 *
 * DESCRIPTION:
 *  This file contains the MPC55xx derivative needed initializations. 
 *  MPC55xx_init_debug.c is only used when willing to debug in RAM. Otherwise, 
 *  MPC55xx_init.c shall be used.
 *  usr_init() is called by the startup code of the application at initialization time
 *  You can add needed hardware initializations here.
 */
 /* Rev Sep 17 2007 SM - commented out handlers and INTC branches */

/* #include "Exceptions.h"*/    /* IVPR and default exception handlers setup */
/* #include "INTCInterrupts.h"*/ /* INTC Interrupts Requests configuration */
#include "MPC5633m_HWInit.h"

#pragma section code_type ".init"

#define INIT_DERIVATIVE_INTERNAL_SETUP 0
#define INIT_EXTERNAL_BUS_INTERFACE_SETUP 0

#ifndef INIT_DERIVATIVE_INTERNAL_SETUP
#pragma error INIT_DERIVATIVE_INTERNAL_SETUP should be defined !
#endif

#ifndef INIT_EXTERNAL_BUS_INTERFACE_SETUP
#pragma error INIT_EXTERNAL_BUS_INTERFACE_SETUP should be defined !
#endif

#ifdef __cplusplus
extern "C" {
#endif

extern __asm void __start();
__asm void usr_init();
/*lint -esym(752,__start) */

#ifdef __cplusplus
}
#endif

/*****************************************************************/
/* usr_init():                                                   */
/*   Define here the needed hardware initializations at startup  */

__asm void usr_init()
{
    /* Add needed hardware initializations in this function */

    nofralloc

    mflr     r30                         /* Save off return address in NV reg */

#if INIT_DERIVATIVE_INTERNAL_SETUP==1
    bl      INIT_Derivative              /* Derivative specific hardware initializations */
#endif
#if INIT_EXTERNAL_BUS_INTERFACE_SETUP==1
    bl      INIT_ExternalBusAndMemory    /* Set up access to external memory (inc. chip select and MMU) */
#endif
 /*   bl      EXCEP_InitExceptionHandlers*/   /* Set up Default Exception handling */
 /*   bl      INTC_InitINTCInterrupts*/       /* Set up INTC Interrupts Requests handling */

    mtlr    r30                          /* Get saved return address */
    
    blr
}