#include #include #include #include #include #include #include #include // the character set starts at the space - 0x20 - to save space const unsigned char font[480] PROGMEM = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x5f,0x00,0x00, // ! 0x00,0x03,0x00,0x03,0x00,0x14,0x7f,0x14,0x7f,0x14, // "# 0x24,0x2a,0x7f,0x2a,0x12,0x23,0x13,0x08,0x64,0x62, // $% 0x36,0x49,0x55,0x22,0x50,0x00,0x05,0x03,0x00,0x00, // &' 0x00,0x1c,0x22,0x41,0x00,0x00,0x41,0x22,0x1c,0x00, // () 0x14,0x08,0x3e,0x08,0x14,0x08,0x08,0x3e,0x08,0x08, // *+ 0x00,0x50,0x30,0x00,0x00,0x08,0x08,0x08,0x08,0x08, // ,- 0x00,0x60,0x60,0x00,0x00,0x20,0x10,0x08,0x04,0x02, // ./ 0x3e,0x51,0x49,0x45,0x3e,0x00,0x42,0x7f,0x40,0x00, // 01 0x42,0x61,0x51,0x49,0x46,0x21,0x41,0x45,0x4b,0x31, // 23 0x18,0x14,0x12,0x7f,0x10,0x27,0x45,0x45,0x45,0x39, // 45 0x3c,0x4a,0x49,0x49,0x30,0x01,0x71,0x09,0x05,0x03, // 67 0x36,0x49,0x49,0x49,0x36,0x06,0x49,0x49,0x29,0x1e, // 89 0x00,0x36,0x36,0x00,0x00,0x00,0x56,0x36,0x00,0x00, // :; 0x08,0x14,0x22,0x41,0x00,0x14,0x14,0x14,0x14,0x14, // <= 0x00,0x41,0x22,0x14,0x08,0x02,0x01,0x51,0x09,0x06, // >? 0x32,0x49,0x79,0x41,0x3e,0x7e,0x11,0x11,0x11,0x7e, // @A 0x7f,0x49,0x49,0x49,0x36,0x3e,0x41,0x41,0x41,0x22, // BC 0x7f,0x41,0x41,0x22,0x1c,0x7f,0x49,0x49,0x49,0x41, // DE 0x7f,0x09,0x09,0x09,0x01,0x3e,0x41,0x49,0x49,0x7a, // FG 0x7f,0x08,0x08,0x08,0x7f,0x00,0x41,0x7f,0x41,0x00, // HI 0x20,0x40,0x41,0x3f,0x01,0x7f,0x08,0x14,0x22,0x41, // JK 0x7f,0x40,0x40,0x40,0x40,0x7f,0x02,0x0c,0x02,0x7f, // LM 0x7f,0x04,0x08,0x10,0x7f,0x3e,0x41,0x41,0x41,0x3e, // NO 0x7f,0x09,0x09,0x09,0x06,0x3e,0x41,0x51,0x21,0x5e, // PQ 0x7f,0x09,0x19,0x29,0x46,0x46,0x49,0x49,0x49,0x31, // RS 0x01,0x01,0x7f,0x01,0x01,0x3f,0x40,0x40,0x40,0x3f, // TU 0x1f,0x20,0x40,0x20,0x1f,0x3f,0x40,0x38,0x40,0x3f, // VW 0x63,0x14,0x08,0x14,0x63,0x07,0x08,0x70,0x08,0x07, // XY 0x61,0x51,0x49,0x45,0x43,0x00,0x7f,0x41,0x41,0x00, // Z[ 0x02,0x04,0x08,0x10,0x20,0x00,0x41,0x41,0x7f,0x00, // \] 0x04,0x02,0x01,0x02,0x04,0x40,0x40,0x40,0x40,0x40, // ^_ 0x00,0x01,0x02,0x04,0x00,0x20,0x54,0x54,0x54,0x78, // `a 0x7f,0x48,0x44,0x44,0x38,0x38,0x44,0x44,0x44,0x20, // bc 0x38,0x44,0x44,0x48,0x7f,0x38,0x54,0x54,0x54,0x18, // de 0x08,0x7e,0x09,0x01,0x02,0x0c,0x52,0x52,0x52,0x3e, // fg 0x7f,0x08,0x04,0x04,0x78,0x00,0x44,0x7d,0x40,0x00, // hi 0x20,0x40,0x44,0x3d,0x00,0x7f,0x10,0x28,0x44,0x00, // jk 0x00,0x41,0x7f,0x40,0x00,0x7c,0x04,0x18,0x04,0x78, // lm 0x7c,0x08,0x04,0x04,0x78,0x38,0x44,0x44,0x44,0x38, // no 0x7c,0x14,0x14,0x14,0x08,0x08,0x14,0x14,0x18,0x7c, // pq 0x7c,0x08,0x04,0x04,0x08,0x48,0x54,0x54,0x54,0x20, // rs 0x04,0x3f,0x44,0x40,0x20,0x3c,0x40,0x40,0x20,0x7c, // tu 0x1c,0x20,0x40,0x20,0x1c,0x3c,0x40,0x30,0x40,0x3c, // vw 0x44,0x28,0x10,0x28,0x44,0x0c,0x50,0x50,0x50,0x3c, // xy 0x44,0x64,0x54,0x4c,0x44,0x00,0x08,0x36,0x41,0x00, // z{ 0x00,0x00,0x7f,0x00,0x00,0x00,0x41,0x36,0x08,0x00, // |} 0x10,0x08,0x08,0x10,0x08,0x00,0x00,0x02,0x05,0x02}; // ^degree /////////////////////////////////////////////////////////////////////////////////////////// // // LCD control functions // // we're controlling a Vikay VK5121ELYG as noted above driven by two SED1520 controller // chips // we use astatic variable 'column' to define which column we're writing and therefore // select the chip and odd offsets where necessary // each chip controls 61 columns but the display has only 120; the 61st column is never used // // void lcd_control(unsigned char) - write to both display control chips // void lcd_set_column(unsigned char) - set the start address for the display // void lcd_set_cursor(unsigned char x, unsigned char y) // - position the text cursor // void lcd_write(unsigned char) - write to the display based on 'column' // lcd_read - return the data from the display (not yet implemented) // void lcd_init(void) - reset the display and clear it // void lcd_cls(void) - clear the display // void lcd_scroll(void) - move the cursor to the next line // void lcd_char(char) - write a character to the display // void lcd_string(* char) - write a zero-terminated string to the display /////////////////////////////////////////////////////////////////////////////////////////// static uint8_t column; static uint8_t cursorx; static uint8_t cursory; //*************************************************************************** //* Port Pin Assignments //*************************************************************************** // pc0-7 d0-7 // pa7 elcnt (backlight control) // pa6 e2 // pa5 a0 // pa4 e1 // pa3 r/~w #define rw PA3 #define e1 PA4 #define a0 PA5 #define e2 PA6 #define elcnt PA7 void lcd_control(unsigned char control) { // write a control value to *both* controllers simultaneously // this makes sense because setup etc is required for both // make port c all outputs DDRC = 0xff; // make all control outputs except elcnt, e1, and e2 low PORTA = _BV(elcnt) | _BV(e1) | _BV(e2); // write the data to port c PORTC = control; // and clear e1 and e2 again PORTA = _BV(elcnt); // we want the light to stay on :) } void lcd_set_cursor(unsigned char cx, unsigned char cy) { // put the cursor on a specified cell, and set the column value at the same time cursorx = cx; cursory = cy; lcd_set_column(cx*6, cy); } void lcd_set_column(unsigned char cx, unsigned char cy) { // set the controller chip data to match the required column and row column = cx; if (cx>60) cx -= 60; lcd_control(cx); // set the column in both controllers lcd_control((cy & 3) | 0xb8); return; } void lcd_write(char data) { // - writes arg0 to the currently selected column of the display // - decides which display to write to by looking at 'column' but // - does not preset the chips' internal column counters - these // - are set by the routine lcd_set_column before writing starts. // - the chips update their internal column counter after each // - write so sequential writes will be to sequential columns but // - this routine does not adjust 'column' // set the data pins for output DDRC = 0xff; if (column == 60) // select column 1 lcd_control(0); // else set e1, e2, rw low, a0 and elcnt high PORTA = _BV(elcnt) | _BV(a0); if (column < 60) // we're in controller 1 PORTA += _BV(e1); else // we're in controller 2 PORTA += _BV(e2); // for some reason the above does not properly compile with |= instead of += // latch the data PORTC = data; // and clear the enables again PORTA &= ~(_BV(e1) | _BV(e2)); return; } void lcd_init(void) { // reset the display and clear it, for both controllers // first, set the control port and turn on the backlight DDRA = 0xff; PORTA = _BV(elcnt); // cursor to top left of window lcd_set_cursor(0,0); // display off lcd_control(0xae); // startup delay of 100ms for (int q=0; q<4; q++) _delay_loop_2(50000); // start line = 0 lcd_control(0xc0); // static driving off lcd_control(0xa4); // column = 0 lcd_control(0); // page = 0 lcd_control(0xb8); // 1/32 duty lcd_control(0xa9); // output bits forwards lcd_control(0xa0); // ensure not in read-modify-write mode lcd_control(0xee); // clear screen lcd_cls(); lcd_control(0xaf); return; } void lcd_cls (void) { for (int r=0; r<4; r++) { lcd_set_cursor(0,r); for (int q=0; q<80; q++) lcd_char(' '); } lcd_set_cursor(0,0); } void lcd_char (char ch) { uint16_t ptr; // write ch to the screen at the current cursor position // update the cursor position and scroll to the next line // if required // to avoid scrolling the screen if we need to use 19,3 the // cursor is moved to the top of the screen again // when we arrive, the cursor is already set // we set the cursor to where we already are, which sets up the column lcd_set_cursor(cursorx, cursory); // now we work out where in the font array the character lives, get the five bytes // that define the character, and stuff them to the display, followed by a zero for space // the characters start with 0x20 ptr = (uint16_t)(ch - 0x20)*5; for (int q = 0; q < 5; q++) { lcd_write(pgm_read_byte(&font[ptr++])); column++; } lcd_write(0); // increment the cursor to the next place cursorx++; if (cursorx == 20) { cursorx = 0; cursory++; } if (cursory == 4) cursory = 0; } void lcd_print (char * text) { int q; // print a string to the lcd for (q=0; q