cstartup_sam7.c

ATMEL公司的demo程序,USB驱动程序,与识别片上flash,并进行枚举和操作.

//*----------------------------------------------------------------------------
//*         ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : Cstartup_SAM7.c
//* Object              : Low level initialisations written in C
//* Creation            : ODi   06/26/2002
//*
//*----------------------------------------------------------------------------

#include "board.h"
#include "trace.h"
#include "dbgu.h"

extern void IRQ_Handler_Entry(void);

// The following functions must be write in ARM mode this function called directly
// by exception vector
extern void AT91F_Spurious_handler(void);
extern void AT91F_Default_IRQ_handler(void);
extern void AT91F_Default_FIQ_handler(void);

//*----------------------------------------------------------------------------
//* \fn    AT91F_DataAbort
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_SpuriousHandler()
{
  TRACE_FATAL("\n\rSpurious Interrupt detected\n\r");
  for(;;);
}


//*----------------------------------------------------------------------------
//* \fn    AT91F_DataAbort
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_DataAbort()
{
  TRACE_FATAL("\n\rData Abort detected\n\r");
  for(;;);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_FetchAbort
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_FetchAbort()
{
  TRACE_FATAL("\n\rPrefetch Abort detected\n\r");
  for(;;);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_Undef
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_Undef()
{
  TRACE_FATAL("\n\rUndef detected\n\r");
  for(;;);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_UndefHandler
//* \brief This function reports that no handler have been set for current IT
//*----------------------------------------------------------------------------
void AT91F_UndefHandler()
{
  TRACE_FATAL("\n\rUndef detected\n\r");
  for(;;);
}


//*----------------------------------------------------------------------------
//* \fn    AT91F_LowLevelInit
//* \brief This function performs very low level HW initialization
//*----------------------------------------------------------------------------
void AT91F_LowLevelInit()
{
  int            i;

  // Watchdog Disable
  AT91C_BASE_WDTC->WDTC_WDMR= AT91C_WDTC_WDDIS;

  // Init Interrupt Controller
  // Set up the default interrupts handler vectors
  AT91C_BASE_AIC->AIC_SVR[0] = (int) AT91F_Default_FIQ_handler ;
  for (i=1;i < 31; i++)
  {
    AT91C_BASE_AIC->AIC_SVR[i] = (int) AT91F_Default_IRQ_handler ;
  }
  AT91C_BASE_AIC->AIC_SPU  = (int) AT91F_Spurious_handler ;

#if defined (TR_INFO) || defined (TR_WARNING) || defined (TR_ERROR) || defined (TR_FATAL) || defined (TR_DEBUG_H) || defined (TR_DEBUG_M)
  // Open PIO for DBGU
  AT91F_DBGU_CfgPIO();

  // Configure DBGU
  AT91F_US_Configure (
    (AT91PS_USART) AT91C_BASE_DBGU,
    AT91C_MASTER_CLOCK,
    AT91C_US_ASYNC_MODE,  	// mode Register to be programmed
    115200 ,	            // baudrate to be programmed
    0);                   	// timeguard to be programmed

  // Enable Transmitter
  AT91F_US_EnableTx((AT91PS_USART) AT91C_BASE_DBGU);
  AT91F_US_EnableRx((AT91PS_USART) AT91C_BASE_DBGU);
#endif

  TRACE_WARNING( "\n\r\n\rAT91F_LowLevelInit() done\n\r");

}