?? low_level_init.c
字號:
/**************************************************
*
* This module contains the function `__low_level_init', a function
* that is called before the `main' function of the program. Normally
* low-level initializations - such as setting the prefered interrupt
* level or setting the watchdog - can be performed here.
*
* Note that this function is called before the data segments are
* initialized, this means that this function cannot rely on the
* values of global or static variables.
*
* When this function returns zero, the startup code will inhibit the
* initialization of the data segments. The result is faster startup,
* the drawback is that neither global nor static data will be
* initialized.
*
* Copyright 1999-2004 IAR Systems. All rights reserved.
*
* $Revision: 1.7 $
*
**************************************************/
/* ICODE is the same segment as cstartup. By placing __low_level_init
* in the same segment, we make sure it can be reached with BL. */
#include "ioaduc7026.h"
#ifdef __cplusplus
extern "C" {
#endif
#pragma language=extended
__interwork int __low_level_init(void);
#pragma location="ICODE"
__interwork int __low_level_init(void)
{
/*==================================*/
/* Initialize hardware. */
/*==================================*/
/*==================================*/
/* Choose if segment initialization */
/* should be done or not. */
/* Return: 0 to omit seg_init */
/* 1 to run seg_init */
/*==================================*/
GP1CON = 0x011; // Setup tx & rx pins on P1.0 and P1.1
GP0CON = 0x220; // ext mem mode for BHE & BLE
GP2CON = 0x22222220;
GP3CON = 0x22222222;
GP4CON = 0x22222222;
// configure ext mem port
// Enable External Memory
XMCFG = 0x1;
XM0CON = 0x3; // enable ext mem in 16-bit mode
XM0PAR = 0x70FF;
// Do what ever is neccessary to configure the external memory segment
// either here or in the cstartup file.
return (1);
}
#pragma language=default
#ifdef __cplusplus
}
#endif
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