/****************************************************************************
* 工程功能: STC控制AD9833
* 編譯器版本: KEIL C 8.01
* 創(chuàng)建日期: 2007.1.26
* 所屬單位: 臺(tái)州邁爾電子,    lmhtz@hotmail.com
* 芯片類型: STC89C5410AD
* 時(shí)鐘頻率: 12MH*/

#include "STC12C2052AD.H"
#define u08 unsigned char
#define u32 unsigned long
#define u16 unsigned int

#define TimeMaxNum ModHex[3] 
#define sMod       ModHex[4]    
#define DF_sfre    ModHex[7]
#define DF_num     ModHex[8]

#define PERHZ 24
#define SerMaxNum 4
#define OK 1
#define CANCLE 0
#define RND 99 

sbit FreStart = P3^0;
sbit SC = P1^3;         //SPI
u08 Tablei;             //選表格用
u08 TimeNum = 0;        //定時(shí)周期數(shù)
bit TempMod = OK;       //數(shù)據(jù)變動(dòng)狀態(tài)
bit CovFlag;
u16 idata dat[100];     //發(fā)送表格

u08 code ModHex[12]=    //code區(qū)修改用,上位機(jī)決定
{
    0x03,0x0d,0x40,     //頻率          [0-2]
              0x10,     //采集周期      [3-3]    低頻控制速度用
              0x01,     //掃頻模式MOD   [4-4]    1是高速 0是低速
         0xff,0x10,     //掃頻幅度      [5-6]
              0x23,     //掃頻頻率      [7-7]
              0x32,     //表格個(gè)數(shù)      [8-8]    高頻控制速度用 低頻時(shí)固定50
         0x38,0x38,     //時(shí)鐘初始值    [9-10]   低頻是控制速度用(備用)
              0x00      //掃頻是否開啟位[11-11]   1開 0關(guān)
};

typedef struct                         
{
    u32 fre;            //頻率
    u16 fre_max;        //掃頻幅度
    u08 start;          //是否開啟掃頻
}settype;
settype set;

/*  set值初始化--------------------------------------------------------------------------------------- */
void SetInit(void)
{
    set.fre     = ModHex[0] * 65536 + ModHex[1] * 256 + ModHex[2];
    set.fre_max = ModHex[5] * 256 + ModHex[6];     
    set.start   = ModHex[11];
}

/* T1初始化------------------------------------------------------------------------------------------------ */
void T1Init(void)
{
    TMOD = 0x20;        //T1 mod 2
    TH1 = ModHex[9];
    TL1 = ModHex[10];
    AUXR &= 0XBF;       //normal clock 
    ET1 = 1;            //open T1 interrupt  enable
}

/* 發(fā)送數(shù)據(jù)到9833無片選----------------------------------------------------------------------------------------------------------- */
void send(u08 a)
{
    SPDAT = a;
    while(!(SPSTAT & 0x80)); //等待標(biāo)志位變化
    SPSTAT |= 0x80;          //清標(biāo)志位
}

/* 發(fā)送2個(gè)字節(jié)到9833------------------------------------------------- */
void send9833(u16 a)
{
    SC = 0;
    send((u08)(a>>8));  //發(fā)送低8位     
    send((u16)(a));     //發(fā)送高8位
    SC = 1;             //觸發(fā)信號(hào)
}

/* STC-MCU SPI初始化------------------------------------------------- */
void SPIInit (void)
{
    SPCTL = 0xdf;       //11011100
    SPSTAT = 0xc0;      //11000000
    AUXR |= 0x08;       //normal  clock 
    EADC_SPI = 1;       //spi enable
}

/*  緩沖處理--------------------------------------------------------- */                                                            
void TempReal(void)
{   
    u32 b_fre;      
    u32 p_fre;     
    u32 Toatal;    
    u08 i;          
    u16 per_fre;   
    
    //緩沖中數(shù)據(jù)沒有更改 退出   
    if(TempMod == CANCLE)                      
    {
        return;
    }
    //緩沖中數(shù)據(jù)有更改+++++++++++++++++++++
    TempMod = CANCLE;                           //清除標(biāo)志位
    b_fre = set.fre * PERHZ;                    //計(jì)算需發(fā)送的頻率數(shù)值
    //有掃頻+++++++++++++++++++++++++++++++
    if (set.start == OK)                        
    {
        p_fre = set.fre_max * PERHZ;            //要處理的便宜頻率數(shù)值
        b_fre -= p_fre;                         //最小頻率
        per_fre = (p_fre<<1) / (DF_num>>1);    
    
        //建立上升沿表格+++++++++++++++++++
        for(i=0; i<DF_num+2; )                       
        {
            Toatal =  b_fre + per_fre * i;                  
            dat[i++] = ((u16)(Toatal) | 0x4000) & 0x7fff;  
            dat[i++] = ((u16)(Toatal>>14)) | 0x4000 ;       
        }
        //建立下降沿表格+++++++++++++++++++
        for(i=2; i<(DF_num); i+=2)                         
        {
            dat[(DF_num<<1)-i+1] = dat[i+1];                
            dat[(DF_num<<1)-i] = dat[i];
        }
        return;
    }
    //無掃頻 只處理0,1字節(jié)+++++++++++++++++
    if(set.start == CANCLE)                     
    {
        dat[0] = ((u16)(b_fre) | 0x4000) & 0x7fff;          //只處理一組數(shù)據(jù)
        dat[1] = ((u16)(b_fre>>14)) | 0x4000 ;  
    }
}

/* 低速掃頻模式--------------------------------------------------------------------------------- */
void SlowSpeedMod(void)
{
    if(TimeNum > TimeMaxNum)               //速度
    {
        TimeNum = 0;
        if(Tablei==100)
        {
            Tablei=0;
        }
        send9833(0x2000);
        send9833(dat[Tablei++]);
        send9833(dat[Tablei++]);
    }
}

/* 高速掃頻模式--------------------------------------------------------------------------------- */
void FastSpeedMod(void)
{
    for(Tablei=0; Tablei< (DF_num<<1); )
    { 
        send9833(0x2000);
        send9833(dat[Tablei++]);
        send9833(dat[Tablei++]);
    }
}

/* 固定頻率 ------------------------------------------------------------------------------------------*/
void NoScanMod(void)
{
    set.start = RND;      
    send9833(0x2000);
    send9833(dat[0]);
    send9833(dat[1]);
//  send9833(0x4f00);
//  send9833(0x4200);  //200KHz    4170
}

/* 處理前一MCU發(fā)送過來的信號(hào)..并防止多少發(fā)送9833停止信號(hào) --------------------------------------------*/
void Check(void (*fun)(void))
{
    if(FreStart == 1)
    {
        fun();
        CovFlag = CANCLE;
    }
    else if(CovFlag == CANCLE)
    {
        send9833(0x0040);
        CovFlag = OK;
    }
}

/* 模式選擇 -----------------------------------------------------------------------------------------*/
void ModSelect(void)
{
    if((set.start == OK) && (sMod == 1))    
    {
        Check(FastSpeedMod);
    }
    else if(set.start == CANCLE)            
    {
        Check(NoScanMod);
    }
}
/* ----------------------------------------------------------------------------------------------- */
void main (void)
{
    T1Init();
    SPIInit();
    SetInit();
    //如果低速掃頻開始T1
    if (sMod == 0)
    {
        TR1 = 1;
    }
    TempReal();
    EA = 1; 
    while(1)
    {  
        ModSelect(); 
        TempReal();
    }
}

/* T1中斷------------------------------------------------------------------------------------------- */
void T1ISR(void) interrupt 3
{
    TimeNum++;
    Check(SlowSpeedMod);
}