智能车制作

标题: zbh [打印本页]

作者: 张宝华 时间: 2011-11-23 21:48
标题: zbh
#include <hidef.h>    /* common defines and macros */

试过很多程序，包括别人实验过的程序，LCD都显示不了东西，这是为什么

#include "derivative.h"    /* derivative-specific definitions */

#define LCD1602_RS PORTB_PB0

#define LCD1602_RW PORTB_PB1

#define LCD1602_EN PORTB_PB2

#define LCDIO PORTA

#define LCDIO_DIR DDRA

#define LCDIO_DIR_IN 0x00

#define LCDIO_DIR_OUT 0xFF

void SetBusCLK_16M(void)

{

CLKSEL=0X00;                               // disengage PLL to system

PLLCTL_PLLON=1;                      // turn on PLL

SYNR=0x00 | 0x01;       // VCOFRQ[7:6];SYNDIV[5:0]

                     // fVCO= 2*fOSC*(SYNDIV + 1)/(REFDIV + 1)

                     // fPLL= fVCO/(2 × POSTDIV)

                     // fBUS= fPLL/2

                     // VCOCLK Frequency Ranges  VCOFRQ[7:6]

                     // 32MHz <= fVCO <= 48MHz 00

                     // 48MHz <  fVCO <= 80MHz 01

                     // Reserved                10

                     // 80MHz <  fVCO <= 120MHz 11

REFDV=0x80 | 0x01;  // REFFRQ[7:6];REFDIV[5:0]

                     // fREF=fOSC/(REFDIV + 1)

                     // REFCLK Frequency Ranges  REFFRQ[7:6]

                     // 1MHz <= fREF <=  2MHz    00

                     // 2MHz <  fREF <=  6MHz    01

                     // 6MHz <  fREF <= 12MHz    10

                     // fREF >  12MHz             11

                     // pllclock=2*osc*(1+SYNR)/(1+REFDV)=32MHz;

POSTDIV=0x00;    // 4:0, fPLL= fVCO/(2xPOSTDIV)

                     // If POSTDIV = $00 then fPLL is identical to fVCO (divide by one).

_asm(nop);       // BUS CLOCK=16M

_asm(nop);

while(!(CRGFLG_LOCK==1));       //when pll is steady ,then use it;

CLKSEL_PLLSEL =1;                      //engage PLL to system;

}

void write_cmd(unsigned char cmd,unsigned BusyC) {

  if (BusyC) ReadStatus(); //Test it busy or not

      LCDIO=cmd;

      LCD1602_RS=1;

      LCD1602_RW=0;

      LCD1602_EN=0;

      LCD1602_EN=0;

      LCD1602_EN=1;

}

void write_data(uchar dat,unsigned BusyC) {

  if (BusyC) ReadStatus(); //Test it busy or not

      LCDIO=dat;

      LCD1602_RS=1;

      LCD1602_RW=0;

      LCD1602_EN=0;

      LCD1602_EN=0;

      LCD1602_EN=1;

}

int ReadStatus(void)

{

  uchar cRtn;

      LCDIO_DIR = LCDIO_DIR_IN;

      LCD1602_RS = 0;

      LCD1602_RW = 1;

      LCD1602_EN = 0;

      LCD1602_EN = 0;

      LCD1602_EN = 1;

      while (LCDIO&0x80); //Test Busy State

      cRtn = LCDIO_DIR;    // if Not save the port value, it should be change

      LCDIO_DIR = LCDIO_DIR_OUT;

      return(cRtn);

}

void LcdDelay(){

  int i, j;

  for (i = 0; i < 300; i++)

for(j = 0; j < 3000; j++);

}

void lcd_init() {

  DDRA = 0xff;

  DDRB = 0xff;

  LCDIO_DIR = LCDIO_DIR_OUT;

      LcdDelay();

      write_cmd(0x01,0);       //clear screen

      write_cmd(0x38,1); //set 8 bit data transmission mode

      write_cmd(0x06,1); // cursor right, disable moving

      write_cmd(0x0f,1); //open display (enable lcd display)

      write_cmd(0x80,1); //set lcd first display address

      write_cmd(0x01,1);       //clear screen



}

void main(void) {

  /* put your own code here */

SetBusCLK_16M();

lcd_init();

      EnableInterrupts;

  for(;;) {

  write_data('f',1);

  DDRE_DDRE5=1;

  PORTE_PE5=0;

_FEED_COP(); /* feeds the dog */

} /* loop forever */

  /* please make sure t

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