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Till Harbaum
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/* Name: main.c
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* Project: LCD2USB; lcd display interface based on AVR USB driver
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* Author: Till Harbaum
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* Creation Date: 2006-01-20
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* Tabsize: 4
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* Copyright: (c) 2005 by Till Harbaum <till@harbaum.org>
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* License: GPL
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* This Revision: $Id: main.c,v 1.2 2007/01/14 12:12:27 harbaum Exp $
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*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include <avr/wdt.h>
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#include <avr/eeprom.h>
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#include <util/delay.h>
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#include "lcd.h"
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// use avrusb library
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#include "usbdrv.h"
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#include "oddebug.h"
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#define VERSION_MAJOR 1
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#define VERSION_MINOR 9
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#define VERSION_STR "1.09"
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// change USB_CFG_DEVICE_VERSION in usbconfig.h as well
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// EEMEM wird bei aktuellen Versionen der avr-lib in eeprom.h definiert
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// hier: definiere falls noch nicht bekannt ("alte" avr-libc)
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#ifndef EEMEM
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// alle Textstellen EEMEM im Quellcode durch __attribute__ ... ersetzen
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#define EEMEM __attribute__ ((section (".eeprom")))
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#endif
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/* bitmask of detected lcd controllers */
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uchar controller = 0;
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/* ------------------------------------------------------------------------- */
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/* PWM units are used for contrast and backlight brightness */
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/* contrast and brightness are stored in eeprom */
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uchar eeprom_valid EEMEM;
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uchar eeprom_contrast EEMEM;
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uchar eeprom_brightness EEMEM;
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void pwm_init(void) {
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/* check if eeprom is valid and set default values if not */
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/* initial values: full contrast and full brightness */
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if(eeprom_read_byte(&eeprom_valid) != 0x42) {
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/* write magic "eeprom is valid" marker 0x42 and default values */
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eeprom_write_byte(&eeprom_valid, 0x42);
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eeprom_write_byte(&eeprom_contrast, 0xff);
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eeprom_write_byte(&eeprom_brightness, 0xff);
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}
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/* PortB: set DDB1 and DDB2 => PORTB1 and PORTB2 are output */
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DDRB |= _BV(1) | _BV(2);
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/* Set Timer1:
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- Fast PWM,8bit => Mode 5 (WGM13=0,WGM12=1,WGM11=0,WGM10=1)
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- Output-Mode: lower voltage is higher contrast
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=> Set OC1A on Compare Match, clear OC1A at BOTTOM, (inverting mode)
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COM1A1=1,COM1A0=1
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higher voltage is higher brightness
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=> Clear OC1B on Compare Match, set OC1B at BOTTOM, (non-inverting mode)
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COM1B1=1,COM1B0=0
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- Timer runs at inernal clock with no prescaling => CS12=0,CS11=0,CS10=1
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*/
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TCCR1A = _BV(COM1A1) | _BV(COM1A0) | _BV(COM1B1) | _BV(WGM10);
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TCCR1B = _BV(WGM12) | _BV(CS10);
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TIMSK &=( (~_BV(2)) & (~_BV(3)) & (~_BV(4)) & (~_BV(5)));
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OCR1A = eeprom_read_byte(&eeprom_contrast);
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OCR1B = eeprom_read_byte(&eeprom_brightness);
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}
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void set_contrast(uchar value) {
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/* store value in eeprom if it actually changed */
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if(value != eeprom_read_byte(&eeprom_contrast))
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eeprom_write_byte(&eeprom_contrast, value);
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OCR1A = value; // lower voltage is higher contrast
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}
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void set_brightness(uchar value) {
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/* store value in eeprom if it actually changed */
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if(value != eeprom_read_byte(&eeprom_brightness))
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eeprom_write_byte(&eeprom_brightness, value);
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OCR1B = value; // higher voltage is higher brightness
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}
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/* ------------------------------------------------------------------------- */
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uchar usbFunctionSetup(uchar data[8]) {
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static uchar replyBuf[4];
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usbMsgPtr = replyBuf;
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uchar len = (data[1] & 3)+1; // 1 .. 4 bytes
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uchar target = (data[1] >> 3) & 3; // target 0 .. 3
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uchar i;
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// request byte:
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// 7 6 5 4 3 2 1 0
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// C C C T T R L L
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// TT = target bit map
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// R = reserved for future use, set to 0
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// LL = number of bytes in transfer - 1
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switch(data[1] >> 5) {
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case 0: // echo (for transfer reliability testing)
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replyBuf[0] = data[2];
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replyBuf[1] = data[3];
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return 2;
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break;
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case 1: // command
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target &= controller; // mask installed controllers
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if(target) // at least one controller should be used ...
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for(i=0;i<len;i++)
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lcd_command(target, data[2+i]);
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break;
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case 2: // data
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target &= controller; // mask installed controllers
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if(target) // at least one controller should be used ...
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for(i=0;i<len;i++)
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lcd_data(target, data[2+i]);
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break;
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case 3: // set
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switch(target) {
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case 0: // contrast
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set_contrast(data[2]);
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break;
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case 1: // brightness
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set_brightness(data[2]);
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break;
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default:
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// must not happen ...
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break;
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}
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break;
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case 4: // get
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switch(target) {
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case 0: // version
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replyBuf[0] = VERSION_MAJOR;
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replyBuf[1] = VERSION_MINOR;
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return 2;
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break;
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case 1: // keys
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replyBuf[0] = ((PINC & _BV(5))?0:1) |
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((PINB & _BV(0))?0:2);
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replyBuf[1] = 0;
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return 2;
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break;
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case 2: // controller map
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replyBuf[0] = controller;
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replyBuf[1] = 0;
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return 2;
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break;
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default:
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// must not happen ...
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break;
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}
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break;
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default:
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// must not happen ...
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break;
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}
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return 0; // reply len
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}
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/* ------------------------------------------------------------------------- */
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int main(void) {
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wdt_enable(WDTO_1S);
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/* let debug routines init the uart if they want to */
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odDebugInit();
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/* all outputs except INT0 and RxD/TxD */
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DDRD = ~(_BV(2) | _BV(1) | _BV(0));
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PORTD = 0;
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PORTC = 0; /* no pullups on USB pins */
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DDRC = ~0; /* output SE0 for USB reset */
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/* USB Reset by device only required on Watchdog Reset */
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_delay_loop_2(40000); // 10ms
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DDRC = ~USBMASK; /* all outputs except USB data */
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usbInit();
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pwm_init();
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DDRC &= ~_BV(5); /* input S1 */
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PORTC |= _BV(5); /* with pullup */
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DDRB &= ~_BV(0); /* input S2 */
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PORTB |= _BV(0); /* with pullup */
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/* try to init two controllers */
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if(lcd_init(LCD_CTRL_0)) controller |= LCD_CTRL_0;
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if(lcd_init(LCD_CTRL_1)) controller |= LCD_CTRL_1;
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/* put string to display (line 1) with linefeed */
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if(controller & LCD_CTRL_0)
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lcd_puts(LCD_CTRL_0, "LCD2USB V" VERSION_STR);
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if(controller & LCD_CTRL_1)
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lcd_puts(LCD_CTRL_1, "2nd ctrl");
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if((controller & LCD_CTRL_0) && (controller & LCD_CTRL_1))
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lcd_puts(LCD_CTRL_0 | LCD_CTRL_1, " both!");
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sei();
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for(;;) { /* main event loop */
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wdt_reset();
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usbPoll();
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}
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return 0;
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}
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/* ------------------------------------------------------------------------- */
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