target.c

一个基于lpc2220的uCosII操作系统的移植

#include "config.h"

void IRQ_Exception(void)
{
    while(1);                   //  change it to your code 这一句替换为自己的代码
}

void FIQ_Exception(void)
{
    while(1);                   // change it to your code  这一句替换为自己的代码
}


void TargetInit(void)
{
    OS_ENTER_CRITICAL();
    srand((INT32U) TargetInit);
    OS_EXIT_CRITICAL();
}

void TargetResetInit(void)
{
	INT8U i;
	INT32U *cp1,*cp2;
#ifdef __DEBUG_RAM    
 //   MEMMAP = 0x2;                   //remap
#endif

#ifdef __DEBUG_FLASH    
    MEMMAP = 0x3;                   //remap
#endif

#ifdef __IN_CHIP    
//    MEMMAP = 0x1;                   //remap
#endif

	//复制向量表到片内RAM
	cp1 = (INT32U *)Reset;
	cp2 = (INT32U *)0x40000000;
	for( i=0;i<16;i++ )
		*cp2++ = *cp1++;
	MEMMAP = 0x2;
	
/* 设置系统各部分时钟 */
/* Set system timers for each component */
    PLLCON = 1;				//使能PLL
#if (Fpclk / (Fcclk / 4)) == 1		// 此值由系统硬件决定
    VPBDIV = 0;
#endif
#if (Fpclk / (Fcclk / 4)) == 2
    VPBDIV = 2;
#endif
#if (Fpclk / (Fcclk / 4)) == 4
    VPBDIV = 1;
#endif
/* 设定PLL 的乘因子M 和除因子P 的值 */
/* Fcclk / Fosc = M
Fcco / Fcclk = 2*P
*/	
#if (Fcco / Fcclk) == 2
    PLLCFG = ((Fcclk / Fosc) - 1) | (0 << 5);
#endif
#if (Fcco / Fcclk) == 4
    PLLCFG = ((Fcclk / Fosc) - 1) | (1 << 5);		//设置M为4,P为2
#endif
#if (Fcco / Fcclk) == 8
    PLLCFG = ((Fcclk / Fosc) - 1) | (2 << 5);
#endif
#if (Fcco / Fcclk) == 16
    PLLCFG = ((Fcclk / Fosc) - 1) | (3 << 5);
#endif
    PLLFEED = 0xaa;						//发送PLL馈送序列
    PLLFEED = 0x55;
    while((PLLSTAT & (1 << 10)) == 0);	//等待PLL锁定
    PLLCON = 3;							//使能并连接PLL
    PLLFEED = 0xaa;						//发送PLL馈送序列
    PLLFEED = 0x55;
    
    /* 设置存储器加速模块 */
    /* Set memory accelerater module*/
    MAMCR = 0;				//禁止MAM功能
#if Fcclk < 20000000		//系统时钟低于20MHz，建议设置MAMTIM为1
    MAMTIM = 1;
#else
#if Fcclk < 40000000		//系统时钟在20～40MHz，建议设置MAMTIM为2
    MAMTIM = 3;
#else
    MAMTIM = 3;				//系统时钟高于40MHz，建议设置MAMTIM为3
#endif
#endif
    MAMCR = 2;				//使能MAM
    
    /* 初始化VIC */
    /* initialize VIC*/
    VICIntEnClr = 0xffffffff;		//清除所有中断
    VICVectAddr = 0;
    VICIntSelect = 0;

    /* 添加自己的代码 */
    /* Add your codes here */

}

/*********************************************************************************************************
**                  以下为一些与系统相关的库函数的实现
**                  具体作用请ads的参考编译器与库函数手册
**                  用户可以根据自己的要求修改        
********************************************************************************************************/
#include "rt_sys.h"

#ifndef DEV_SIMULATE
#pragma import(__use_no_semihosting_swi)
#pragma import(__use_two_region_memory)
#endif /* DEV_SIMULATE */

int __rt_div0(int a)
{
    a = a;
    return 0;
}

int fputc(int ch,FILE *f)
{
    ch = ch;
    f = f;
    return 0;
}

int fgetc(FILE *f)
{
    f = f;
    return 0;
}


int _sys_close(FILEHANDLE fh)
{
    fh = fh;
    return 0;
}

int _sys_write(FILEHANDLE fh, const unsigned char * buf,
			   unsigned len, int mode)
{
    fh = fh;
    buf = buf;
    len =len;
    mode = mode;
    return 0;
}
int _sys_read(FILEHANDLE fh, unsigned char * buf,
			  unsigned len, int mode)
{
    fh = fh;
    buf = buf;
    len =len;
    mode = mode;
    
    return 0;
}

void _ttywrch(int ch)
{
    ch = ch;
}

int _sys_istty(FILEHANDLE fh)
{
    fh = fh;
    return 0;
}
int _sys_seek(FILEHANDLE fh, long pos)
{
    fh = fh;
    return 0;
}
int _sys_ensure(FILEHANDLE fh)
{
    fh = fh;
    return 0;
}

long _sys_flen(FILEHANDLE fh)
{
    fh = fh;
    return 0;
}
int _sys_tmpnam(char * name, int sig, unsigned maxlen)
{
    name = name;
    sig = sig;
    maxlen = maxlen;
    return 0;
}

void _sys_exit(int returncode)
{
    returncode = returncode;
}

char *_sys_command_string(char * cmd, int len)
{
    cmd = cmd;
    len = len;
    return 0;
}