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回复 3# chiusir
能不能帮我看下这个程序为什么不能在LCD1602上显示出字符f- #include <hidef.h> /* common defines and macros */
- #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 that you never leave main */
- }
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