Какво трябва да се промени в инициализиращата подпрограма, за да работи 16х1 дисплеят в 16х1 режим. Програмата в микроконтролера PIC16F628A работи като за 16х1 дисплей, но дясната половина на изображението не се изобразява.
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| Код: ; ; ***************************************************************************** ; * * ; * Purpose: Power on initialization of Liquid Crystal Display. The LCD * ; * controller chip must be equivalent to an Hitachi 44780. The * ; * LCD is assumed to be a 8x1 or a 16x1 display. * ; * * ; * Input: None * ; * * ; * Output: None * ; * * ; ***************************************************************************** ; init_LCD call wait_64ms ; Wait for LCD to power up movlw CMD_RESET_LCD ; LCD init instruction (First) movwf PORTB ; Send to LCD via RB3..RB0 bsf PORTB,LCD_e ; Set the LCD E line high, call wait_64ms ; wait a "long" time, bcf PORTB,LCD_e ; and then Clear E movlw CMD_RESET_LCD ; LCD init instruction (Second) movwf PORTB ; Send to LCD via RB3..RB0 bsf PORTB,LCD_e ; Set E high, call wait_32ms ; wait a while, bcf PORTB,LCD_e ; and then Clear E movlw CMD_RESET_LCD ; LCD init instruction (Third) movwf PORTB ; Send to LCD via RB3..RB0 bsf PORTB,LCD_e ; Set E high, call wait_32ms ; wait a while, bcf PORTB,LCD_e ; and then Clear E movlw PICEL_IFC1 ; Set the LCD for 4-bit mode I/O movwf PORTB ; Send to LCD via RB3..RB0 bsf PORTB,LCD_e ; Set E high, call wait_16ms ; wait a while, bcf PORTB,LCD_e ; and then Clear E movlw PICEL_IFC2 ; Set operational characteristics of LCD call cmnd2LCD ; Send command in w to LCD movlw PICEL_DISPLAY_OFF ; Display off, cursor and blink off call cmnd2LCD ; Send command to LCD movlw CMD_CLEAR_LCD ; Clear and reset cursor call cmnd2LCD ; Send command in w to LCD movlw PICEL_CURSOR_RT ; Set cursor to move right, no display shift call cmnd2LCD ; Send command in w to LCD movlw PICEL_DISPLAY_ON ; Display on, cursor on, blink off call cmnd2LCD ; Send command to LCD return ; Done! | |
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