clk_init.c

基于DSP5509的实际路况交通灯的模拟 希望对DSP初学者有所帮助

#include"myapp.h"
void CLK_init( void )
{
  // ioport unsigned int *clkmd;
  // clkmd=(unsigned int *)0x1c00;
  // *clkmd =0x2413;// 0x2033;//0x2413;// 144MHz //2613
  PLL_Init(16);
}
void EMIF_init(void)
{
    /*ioport unsigned int *CLKMD = (unsigned int *)0x1c00; 
    ioport unsigned int *EBSR  = (unsigned int *)0x6c00;
    ioport unsigned int *EGCR  = (unsigned int *)0x800;
    ioport unsigned int *EMIRST= (unsigned int *)0x801;
    ioport unsigned int *EMIBE = (unsigned int *)0x802; 
    ioport unsigned int *CE01  = (unsigned int *)0x803;
    ioport unsigned int *CE02  = (unsigned int *)0x804;
    ioport unsigned int *CE03  = (unsigned int *)0x805;
    ioport unsigned int *CE11  = (unsigned int *)0x806;
    ioport unsigned int *CE12  = (unsigned int *)0x807;
    ioport unsigned int *CE13  = (unsigned int *)0x808;
    ioport unsigned int *CE21  = (unsigned int *)0x809;
    
    ioport unsigned int *CE22  = (unsigned int *)0x80A;
    ioport unsigned int *CE23  = (unsigned int *)0x80B;
    ioport unsigned int *CE31  = (unsigned int *)0x80C;
    ioport unsigned int *CE32  = (unsigned int *)0x80D;
    ioport unsigned int *CE33  = (unsigned int *)0x80E;
    ioport unsigned int *SDC1  = (unsigned int *)0x80F;
    ioport unsigned int *SDPER = (unsigned int *)0x810;
    ioport unsigned int *SDCNT = (unsigned int *)0x811;
    ioport unsigned int *INIT  = (unsigned int *)0x812;
    ioport unsigned int *SDC2  = (unsigned int *)0x813;*/
    ioport unsigned int *CE21  = (unsigned int *)0x809;
   /* *EBSR = 0xa01;
    *EGCR = 0x220;
    *EGCR = 0X220;
    *CE01 =0X3000;
    *CE11 = 0X1fff;
    *CE21 =0x1fff;
    *EMIRST = 0;
    *SDC1 =0X5958;
    *SDC2=0X38F;
    *INIT = 0;*/
    
    *CE21 =0x1fff;
        
                
}
void TMCR_reset( void )
{
    ioport unsigned int *TMCR_MGS3=(unsigned int *)0x07FE;   
    ioport unsigned int *TMCR_MM =(unsigned int *)0x07FF;   
    *TMCR_MGS3 =0x510;
    *TMCR_MM   =0x000;


}
#define DSP_CLKIN 12
typedef struct {
    int freq;        // DSP operating clock
    int clkin;       // DSP input clock
    int pllmult;     // PLL multiplier
    int plldiv;      // PLL divisor
    int clksperusec; // DSP clocks per usec
    int nullloopclk; // DSP clocks per null loop
} DSPCLK;
void PLL_Init(int freq)
{
    int i;
    DSPCLK dspclk;
    ioport unsigned int *clkmd;
    clkmd=(unsigned int *)0x1c00;
    
    // Calculate PLL multiplier values (only integral multiples now)
    dspclk.clkin = DSP_CLKIN;
    dspclk.pllmult = (freq *2)/ dspclk.clkin;
    
    if(dspclk.pllmult>= 32)dspclk.pllmult=31; 
   // dspclk.nullloopclk = NULLLOOP_CLK;

    // Turn the PLL off
    *clkmd &= ~0x10; //pll enable = 0;
    for(i=*clkmd&1; i!= 0 ;i=*clkmd&1);

    // Initialize PLL flags
    *clkmd &= ~0x4000; // iai=0;
    *clkmd |= 0x2000;  // iob=1;
      // Set the multiplier/divisor
  //  WriteMask(pCMOD -> clkmd,
  //      CLKMD_PLLDIV_1 | CLKMD_BYPASSDIV_1,
  //      CLKMD_PLLDIV_MASK | CLKMD_BYPASSDIV_MASK);
    *clkmd &= ~0xc;
    *clkmd |= 4;
    *clkmd &= ~0x60;
    *clkmd |= 0x20;
    //WriteField(pCMOD -> clkmd, dspclk.pllmult, CLKMD_PLLMULT_MASK);
    *clkmd &= ~0x0f80;
    *clkmd |= dspclk.pllmult<<7;
    // Enable the PLL and wait for lock
    *clkmd|=0x10;
    for(i=0;i<10;i++);
    for(i=*clkmd&1; i!= 1 ;i=*clkmd&1);

    
}