target.c

在51上运行的小的OS系统

** Created by:                Chenmingji
** Created Date:            2004/02/02
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
        void InitialiseUART0(uint32 bps)
{      
    uint16 Fdiv;
    
    PINSEL0 = (PINSEL0 & 0xfffffff0) | 0x05;    /* Select the pins for Uart 选择管脚为UART0 */

    U0LCR = 0x80;                               /* Enable to access the frequenc regecter 允许访问分频因子寄存器 */
    Fdiv = (Fpclk / 16) / bps;                  /* Set the baudrate设置波特率 */
    U0DLM = Fdiv / 256;                            
    U0DLL = Fdiv % 256;                        
    U0LCR = 0x03;                               /* Disable to access the frequenc regecter 禁止访问分频因子寄存器 */
                                                /* set to 8,1,n 且设置为8,1,n */
    U0IER = 0x00;                               /* Disable interrupt禁止中断 */
    U0FCR = 0x00;                               /* initial FIFO 初始化FIFO */
} 
/*********************************************************************************************************
** Function name:            TargetResetInit
**
** Descriptions:            Initialize the target 
**
** input parameters:        None
** Returned value:            None
**         
** Used global variables:    None
** Calling modules:            None
**
** Created by:                Chenmingji
** Created Date:            2004/02/02
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
        void TargetResetInit(void)
{
#ifdef __DEBUG_RAM    
    MEMMAP = 0x2;                   //remap
#endif

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

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

//    PINSEL0 = (PINSEL0 & 0xFFFF0000) | 0x05 | 0x50;


/* 设置系统各部分时钟 */
/* Set system timers for each component */
    PLLCON = 1;
#if (Fpclk / (Fcclk / 4)) == 1
    VPBDIV = 0;
#endif
#if (Fpclk / (Fcclk / 4)) == 2
    VPBDIV = 2;
#endif
#if (Fpclk / (Fcclk / 4)) == 4
    VPBDIV = 1;
#endif

#if (Fcco / Fcclk) == 2
    PLLCFG = ((Fcclk / Fosc) - 1) | (0 << 5);
#endif
#if (Fcco / Fcclk) == 4
    PLLCFG = ((Fcclk / Fosc) - 1) | (1 << 5);
#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;
    PLLFEED = 0x55;
    while((PLLSTAT & (1 << 10)) == 0);
    PLLCON = 3;
    PLLFEED = 0xaa;
    PLLFEED = 0x55;

/* 设置存储器加速模块 */
/* Set memory accelerater module*/
    MAMCR = 0;
#if Fcclk < 20000000
    MAMTIM = 1;
#else
#if Fcclk < 40000000
    MAMTIM = 2;
#else
    MAMTIM = 3;
#endif
#endif
    MAMCR = 2;

/* 设置串行口 */
/* initialize UART*/
    InitialiseUART0(115200);

/* 设置实时时钟 */
/* initialize RTC*/
    CCR = 1;
    PREINT = Fpclk / 32768 - 1;
    PREFRAC = Fpclk - (Fpclk / 32768) * 32768;
    YEAR = 2003;
    MONTH = 6;
    DOM = 2;
    
/* initialize VIC*/
    VICIntEnClr = 0xffffffff;
    VICVectAddr = 0;
    VICIntSelect = 0;
    T0IR = 0xffffffff;
    T0TCR = 0X02;
}


/*********************************************************************************************************
**                  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        
********************************************************************************************************/
/*********************************************************************************************************
**                  The implementations for some library functions
**                  For more details, please refer to the ADS compiler handbook and The library 
**                    function manual
**                  User could change it as needed       
********************************************************************************************************/

/*
这段程序，，去除掉。。。
by mcu123
在startup.s 中添加了
*/
/*
#include "rt_sys.h"
#include "stdio.h"

#pragma import(__use_no_semihosting_swi)

        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;
}
*/
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/