reset.c

USBN9603的DEMO程序

 /*----------------------------------------------------------------------------
 *  Copyright (c) 200 by National Semiconductor Corporation
 *  National Semiconductor Corporation
 *
 *  All rights reserved
 *
 *<<<-------------------------------------------------------------------------
 *  File Contents:
 *	Reset routines
 *
 *  Project: USB Demo firmware
 *  Author : Yan Nosovitsky
 *  Date   : Oct 2001
 *----------------------------------------------------------------------->>>*/

#include "..\include\all.h"

/*<<<------------------------------------------------------------------------- 
 *
 * The software reset routine. Initializes the main system blocks (like
 * stacks, wait-states, dispach table) before we can start working.
 *
 *--------------------------------------------------------------------------*/ 
void c_reset(void)
{
    u_int saved_psr;
	WORD i;

	/*------------------------------
	* delay to make cristal stable
	*-----------------------------*/
	for(i=0 ;i< 0xFFFF ;i++);

	ICU_init();

	/*------------------------------------
	* Set the clock 20MHz max performence 
	*------------------------------------*/
	HFCGN = 0x0A;
	HFCGML = 0xD6;
	HFCGMH = 0x17; 

	HFCGCTRL1 |= HFCGCTRL1_LOAD;

	/*----------------------------------------------------------------
	* Set the memory to work with late write, and enable the BIU unit
	*----------------------------------------------------------------*/
	BCFG = 0;
	MCFG = MCFG_ENEIO;
	MCFGSH = MCFG_ENEIO;
	
	/*-----------------------------------------
	* 0 wait state, 3 hold clock, 0 idle cycle
	*----------------------------------------*/
	IOCFG = IOCFG_HOLD0 | IOCFG_HOLD1; 
	SZCFG1 = SZCFG1_BW | SZCFG1_FRE;

	/*-------------------------
	* Set the Leds presentation 
	*-------------------------*/
	/*-----------------------------------------------------
	* Set IOPF port aternate function to work as GPIO port
	*----------------------------------------------------*/
	PFALT = 0x0;	
	/*----------------------------------------------
	* Set the direction of the IOPF port to output
	*--------------------------------------------*/	
	PFDIR = 0xFF;		
	PFDOUT = 0x80;
	/*----------------------
	* Turn off all the Leds
	*----------------------*/
	SET_ID_LEDS(0);		
	RESET_USB_LED();

	/*-------------------------
	*Set the GPIO port to 0x55
	*-------------------------*/
	/*-----------------------------------
	* Set IOPC alternate funcion to GPIO
	*----------------------------------*/
	PCALT = 0;
	/*--------------------------------
	* Set all the IOPC port to output
	*-------------------------------*/		
	PCDIR = 0xFF;
	/*---------------------------------------
	* Set the output of the IOPC port to 0x55
	*--------------------------------------*/	
	PCDOUT = 0x0;	
	
    /*--------------- 
    * USBN9604 init 
    *-------------*/
    USBN9604_init();
	
	/*---------------------
	* enable usb interrupt
	*-------------------*/
	USB_int_enable();

	/*-----------------------
	* Watchdog initialization
	*-----------------------*/
	WATCHDOG_INIT;
	
	
	/*------------------
	* Enable interrupts 
	*-----------------*/
    _spr_("psr",saved_psr);
    saved_psr |= PSR_E_BIT_MASK | PSR_I_BIT_MASK;
    _lpr_("psr",saved_psr);

	main();
}

/*----------------------------------------------------------------------------
 * void panic(msg)
 *
 * This function is a hook for catching anomalous/catastrophic events.
 * It can be replacable by the user (since it resides in a library)
 * simply by defining it somewhere else.
 *
 * It assumes the 'msg' contains some information about the problem,
 * (although you don't HAVE to pass it anything).
 * Examining the context (active routines on the current stack, 'where'
 * from within the debugger) may further direct you to the problem.
 *
 * This is here only for debugging - if you get here - it is a real problem
 * that should never happen in a final product.
 * In the 'production' we do a cold-reset from here, just in case...
 * In principle, 'panic' should be never called in a real product.
 *--------------------------------------------------------------------------*/
public int panic(char *str)
{
#ifdef DEBUG
	printf(str);
	ROM_BPT;
#else
	WATCHDOG_RESET;
#endif
    return 0;
}