LCD + PIC18F452 in CCS

[Vizitator utopic]

Salut.

Am urmatoarea problema: vreau sa fac un mic programel in CCS care sa afiseze un text pe un LCD. Toate bune si frumoase pana cand vad ca driverul oferit de CCS e un pic nasol in sensul ca trebuie ca linile de date sa fie pe acelasi port cu linile de control. Asa ca am luat un alt driver fff frumos implementat:

// flex_lcd.c// These pins are for the Microchip PicDem2-Plus board,// which is what I used to test the driver.  Change these// pins to fit your own board.#define LCD_DB4   PIN_D0#define LCD_DB5   PIN_D1#define LCD_DB6   PIN_D2#define LCD_DB7   PIN_D3#define LCD_E     PIN_C0#define LCD_RS    PIN_C2#define LCD_RW    PIN_C1// If you only want a 6-pin interface to your LCD, then// connect the R/W pin on the LCD to ground, and comment// out the following line.#define USE_LCD_RW   1     //========================================#define lcd_type 2        // 0=5x7, 1=5x10, 2=2 lines#define lcd_line_two 0x40 // LCD RAM address for the 2nd lineint8 const LCD_INIT_STRING[4] ={ 0x20 | (lcd_type << 2), // Func set: 4-bit, 2 lines, 5x8 dots 0xc,                    // Display on 1,                      // Clear display 6                       // Increment cursor };                             //-------------------------------------void lcd_send_nibble(int8 nibble){// Note:  !! converts an integer expression// to a boolean (1 or 0). output_bit(LCD_DB4, !!(nibble & 1)); output_bit(LCD_DB5, !!(nibble & 2));  output_bit(LCD_DB6, !!(nibble & 4));    output_bit(LCD_DB7, !!(nibble & 8));    delay_cycles(1); output_high(LCD_E); delay_us(2); output_low(LCD_E);}//-----------------------------------// This sub-routine is only called by lcd_read_byte().// It's not a stand-alone routine.  For example, the// R/W signal is set high by lcd_read_byte() before// this routine is called.     #ifdef USE_LCD_RWint8 lcd_read_nibble(void){int8 retval;// Create bit variables so that we can easily set// individual bits in the retval variable.#bit retval_0 = retval.0#bit retval_1 = retval.1#bit retval_2 = retval.2#bit retval_3 = retval.3retval = 0;   output_high(LCD_E);delay_cycles(1);retval_0 = input(LCD_DB4);retval_1 = input(LCD_DB5);retval_2 = input(LCD_DB6);retval_3 = input(LCD_DB7); output_low(LCD_E);   return(retval);   }   #endif//---------------------------------------// Read a byte from the LCD and return it.#ifdef USE_LCD_RWint8 lcd_read_byte(void){int8 low;int8 high;output_high(LCD_RW);delay_cycles(1);high = lcd_read_nibble();low = lcd_read_nibble();return( (high<<4) | low);}#endif//----------------------------------------// Send a byte to the LCD.void lcd_send_byte(int8 address, int8 n){output_low(LCD_RS);#ifdef USE_LCD_RWwhile(bit_test(lcd_read_byte(),7)) ;#elsedelay_us(60); #endifif(address)   output_high(LCD_RS);else   output_low(LCD_RS);      delay_cycles(1);#ifdef USE_LCD_RWoutput_low(LCD_RW);delay_cycles(1);#endifoutput_low(LCD_E);lcd_send_nibble(n >> 4);lcd_send_nibble(n & 0xf);}//----------------------------void lcd_init(void){int8 i;output_low(LCD_RS);#ifdef USE_LCD_RWoutput_low(LCD_RW);#endifoutput_low(LCD_E);delay_ms(15);for(i=0 ;i < 3; i++)   {    lcd_send_nibble(0x03);    delay_ms(5);   }lcd_send_nibble(0x02);for(i=0; i < sizeof(LCD_INIT_STRING); i++)   {    lcd_send_byte(0, LCD_INIT_STRING[i]);       // If the R/W signal is not used, then    // the busy bit can't be polled.  One of    // the init commands takes longer than    // the hard-coded delay of 60 us, so in    // that case, lets just do a 5 ms delay    // after all four of them.    #ifndef USE_LCD_RW    delay_ms(5);    #endif   }}//----------------------------void lcd_gotoxy(int8 x, int8 y){int8 address;if(y != 1)   address = lcd_line_two;else   address=0;address += x-1;lcd_send_byte(0, 0x80 | address);}//-----------------------------void lcd_putc(char c){ switch(c)   {    case '\f':      lcd_send_byte(0,1);      delay_ms(2);      break;       case '\n':       lcd_gotoxy(1,2);       break;       case '\b':       lcd_send_byte(0,0x10);       break;       default:       lcd_send_byte(1,c);       break;   }}//------------------------------#ifdef USE_LCD_RWchar lcd_getc(int8 x, int8 y){char value;lcd_gotoxy(x,y);// Wait until busy flag is low.while(bit_test(lcd_read_byte(),7)); output_high(LCD_RS);value = lcd_read_byte();output_low(lcd_RS);return(value);}#endif

Driverul cica e 100% functional. Bun....fac urmatorul mini program si cand scriu hex-ul cu PICkit2.60 nu functioneaza.

#include "C:\Documents and Settings\Admin\Desktop\CCS - Proiect\LCD - Stand Alone\LCD.h"#include "flex_lcd.c"#use delay(clock=2000000) // you must use this line becuse the LCD.C use the delay_us() functionsvoid main() {while(1){lcd_init(); //fie in afara din while;lcd_gotoxy(1,1);lcd_putc("Welcome");}} 

Nu inteleg de ce.....intre timp eu am mai facut un program in MPLAB. In MPLAB scriu hex-urile direct din program nu din PICkit2.60. (programatorul e PICkit2). Cand sa scriu hex-ul scris in MPLAB cu programul PICkit2.60 nu afiseaza nimic pe LCD.....nu inteleg deloc de ce(daca il scriu si dau run din MPLAB merge).....ma poate ajuta, sfatui cineva de ce anume si ce as putea sa fac? Cu ce sa scriu hex-ul?

Experienta mea in microcontrolere e una medie....inainte lucram doar cu bootloader dar acum intampin tot felu de probleme de cand nu mai pot folosi bootloader.

[Liviu M]

Eu nu vad nicaieri partea de configurare a PIC-ului (cu ce fel de oscilator functioneaza, watchdog...)

[Vizitator utopic]

Intr-adevar n-am selectat high speed oscilator >4Mhz cand am creat proiectul . Problema este rezolvata....functioneaza perfect.

Acum am insa alta problema...:

Vreau sa interoghez periodic o chestie pusa pe serial care functioneaza pe baza de comenzi AT. Am incercat sa fac urmatorul cod:

   lcd_gotoxy(1,2);   printf("AT\n");   data=fgetc();   lcd_putc(data);

Nu stiu daca o comanda AT se termina doar prin \n sau mai are ceva. Sau poate nu are nimic la sfarsit....

Oricum nu receptionez nimic. Fac corect receptionarea? (fara intreruperi and stuff pt. inceput). Ar trebui sa primesc "OK".

 

 

P.S. Poate ar fi trebuit sa pun si un delay maricel intre send si receive....dar....doar asta sa fie problema?

[Liviu M]

Ai configurat portul serial (USART) in PIC?Cine-s printf si fgetc? Se uita astea la portul serial sau nu?

[Vizitator utopic]

PIC-ul e configurat. Fct-le alea se uita pe serial. Am verificat cu osciloscopul. Azi am reusit sa transmit date pe serial dar minune....cand receptionez receptionez fix ce am trimis ))))))))))))))))))))))Eu trimit unui modem comanda "AT" apoi 0x0d (cred ca asta e finalul unei comenzi AT) si cand receptionez si afisez pe LCD imi da tot AT. )Trebuia sa primesc OK. Nu inteleg ce ar putea fi...