First code.

Makefile

@@ -0,0 +1,44 @@
+DEVICE_CC = atmega328p
+DEVICE_DUDE = m328p
+
+# PROGRAMMER_DUDE = -Pusb -c dragon_isp
+PROGRAMMER_DUDE = -P/dev/ttyUSB0 -c stk500v1 -b 57600
+
+AVRDUDE=avrdude
+OBJCOPY=avr-objcopy
+OBJDUMP=avr-objdump
+CC=avr-gcc
+LD=avr-gcc
+
+LDFLAGS=-Wall -g -mmcu=$(DEVICE_CC)
+CPPFLAGS=
+CFLAGS=-mmcu=$(DEVICE_CC) -Os -Wall -g -DF_CPU=16000000UL
+
+MYNAME=avr-cobalt-panel
+
+OBJS=$(MYNAME).o hd44780.o cobalt_buttons.o cobalt_leds.o \
+	serial.o menu.o protocol.o
+
+all : $(MYNAME).hex $(MYNAME).lst
+
+$(MYNAME).bin : $(OBJS)
+
+%.hex : %.bin
+	$(OBJCOPY) -j .text -j .data -O ihex $^ $@ || (rm -f $@ ; false )
+
+%.lst : %.bin
+	$(OBJDUMP) -S $^ >$@ || (rm -f $@ ; false )
+
+%.bin : %.o
+	$(LD) $(LDFLAGS) -o $@ $^
+
+include $(OBJS:.o=.d)
+
+%.d : %.c
+	$(CC) -o $@ -MM $^
+
+.PHONY : clean burn
+burn : $(MYNAME).hex
+	$(AVRDUDE) $(PROGRAMMER_DUDE) -p $(DEVICE_DUDE) -U flash:w:$^
+clean :
+	rm -f *.bak *~ *.bin *.hex *.lst *.o *.d

avr-cobalt-panel.c

@@ -0,0 +1,67 @@
+/* ----------------------------------------------------------------------------
+This file is part of avr_cobalt_panel.
+
+(c) 2012 Christian Vogel <[email protected]>
+
+avr_cobalt_panel is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+avr_cobalt_panel is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+For a copy of the GNU General Public License see http://www.gnu.org/licenses/.
+---------------------------------------------------------------------------- */
+
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <stdio.h>
+#include <util/delay.h>
+
+#include "hd44780.h"
+#include "cobalt_leds.h"
+#include "cobalt_buttons.h"
+#include "serial.h"
+#include "menu.h"
+#include "protocol.h"
+
+prog_char hello_one[] = "avr-cobalt-panel";
+prog_char hello_two[] = "github/vogelchr";
+
+int
+main(void)
+{
+	uint8_t button;
+	uint16_t i;
+
+	serial_init();
+
+	hd44780_init();
+	cobalt_leds_init();
+	cobalt_buttons_init();
+
+	hd44780_reset();
+	hd44780_data_PSTR(hello_one,16);
+	hd44780_cursor(0,1,1,0); /* x,y,cursor,blink */
+	hd44780_data_PSTR(hello_two,15);
+
+	while(1){
+		i++;
+		_delay_us(10);
+
+		if(serial_status())
+			protocol_eat_char(getchar());
+
+		if(cobalt_buttons_debounce(&button,200)){
+			char c = cobalt_buttons_simple_char(button);
+			/* we are only interested in single key presses,
+			   not combinations */
+
+			if(c)
+				putchar(c);
+		}
+	}
+}

cobalt_buttons.c

@@ -0,0 +1,96 @@
+/* ----------------------------------------------------------------------------
+This file is part of avr_cobalt_panel.
+
+(c) 2012 Christian Vogel <[email protected]>
+
+avr_cobalt_panel is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+avr_cobalt_panel is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+For a copy of the GNU General Public License see http://www.gnu.org/licenses/.
+---------------------------------------------------------------------------- */
+
+#include "cobalt_buttons.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <avr/pgmspace.h>
+
+#include "hd44780.h"
+
+#define PORT_CTRL    PORTB
+#define DDR_CTRL     DDRB
+#define BIT_nOE      _BV(5)
+
+
+void
+cobalt_buttons_init()
+{
+	PORT_CTRL |= BIT_nOE;
+	DDR_CTRL  |= BIT_nOE;
+}
+
+static uint8_t cobalt_buttons_last=0; /* last read button value */
+static uint8_t cobalt_buttons_ctr=0;  /* debounce timer */
+
+uint8_t
+cobalt_buttons_debounce(uint8_t *buttons,uint8_t debounce_counter)
+{
+	uint8_t b = cobalt_buttons_get();
+
+	/* different than last time? Set debounce timer to given value. */
+	if(b != cobalt_buttons_last){
+		cobalt_buttons_last = b; /* update last read button value */
+		cobalt_buttons_ctr = debounce_counter;
+		return 0;
+	}
+
+	if(cobalt_buttons_ctr == 0)
+		return 0; /* debounce counter has already expired, no changes */
+
+	cobalt_buttons_ctr--;
+
+	if(cobalt_buttons_ctr > 0)
+		return 0; /* debounce counter has not yet expired */
+
+	/* debounce counter has expired, return button to user */
+	*buttons = b;
+	return 1;
+}
+
+uint8_t
+cobalt_buttons_get()
+{
+	uint8_t ret;
+
+	cli();
+	PORT_CTRL &= ~BIT_nOE;
+	_delay_us(2);
+	ret = hd44780_dbus_read();
+	PORT_CTRL |= BIT_nOE;
+	sei();
+
+	ret ^= 0xff;
+	return ret & COBALT_BUTTONS_ALL;
+}
+
+prog_char button_chars[8]="0PLUDRES";
+
+char
+cobalt_buttons_simple_char(uint8_t buttons){
+	uint8_t k;
+	char * p = button_chars;
+
+	for(k=0;k<8;k++){
+		if(buttons == (1<<k))
+			return pgm_read_byte(p);
+		p++;
+	}
+	return '\0';
+}

cobalt_buttons.h

@@ -0,0 +1,45 @@
+#ifndef COBALT_BUTTONS_H
+#define COBALT_BUTTONS_H
+
+#include <stdint.h>
+
+/* see README for connection of buttons to port pins */
+
+#define COBALT_BUTTON_PIN   (1<<1) /* hidden beneath hole right of display */
+#define COBALT_BUTTON_LEFT  (1<<2)
+#define COBALT_BUTTON_UP    (1<<3)
+#define COBALT_BUTTON_DOWN  (1<<4)
+#define COBALT_BUTTON_RIGHT (1<<5)
+#define COBALT_BUTTON_E     (1<<6)
+#define COBALT_BUTTON_S     (1<<7)
+
+#define COBALT_BUTTONS_ALL  0xfe
+
+/* setup data direction registers etc... */
+extern void cobalt_buttons_init();
+
+/* get bitfield of currently pressed buttons */
+extern uint8_t cobalt_buttons_get();
+
+/* debounce buttons:
+
+   This function is called repeatedly with a constant "debounce counter"
+   argument. The currently pressed buttons are compared with the state
+   of buttons the last time this function has been called.
+
+   If the button inputs have been on a stable value for "debounce_counter"
+   invocations of this function, then it will return 1 *once*.
+*/
+
+extern uint8_t cobalt_buttons_debounce(uint8_t *buttons,uint8_t debounce_counter);
+
+/* convert the button mask buttons to a single char
+   LEFT -> 'L', RIGHT -> 'R',
+   UP -> 'U',   DOWN  -> 'D',
+   E -> 'E',    S -> 'S',
+   PIN -> 'P'
+*/
+
+extern char cobalt_buttons_simple_char(uint8_t buttons);
+
+#endif

cobalt_leds.c

@@ -0,0 +1,45 @@
+/* ----------------------------------------------------------------------------
+This file is part of avr_cobalt_panel.
+
+(c) 2012 Christian Vogel <[email protected]>
+
+avr_cobalt_panel is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+avr_cobalt_panel is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+For a copy of the GNU General Public License see http://www.gnu.org/licenses/.
+---------------------------------------------------------------------------- */
+#include "cobalt_leds.h"
+
+#include <stdio.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+void cobalt_leds_init(){
+	cli();
+	DDRB  |=   0x07;  /* PB0 = Web, PB1 = Disk, PB2 = Logo */
+	DDRD  |=   0x3c;    /* PD2..PD5 */
+	sei();
+
+	cobalt_leds_set(0);
+}
+
+void cobalt_leds_set(uint8_t leds){
+
+	printf("Set LEDs 0x%02hhx.\n",leds);
+
+	leds ^= (COBALT_LED_DISK | COBALT_LED_NET);
+
+	cli();
+	/* Web, Disk, Logo on portb, not inverted */
+	PORTB = (PORTB & ~ 0x07) | ( leds & 0x07);
+	/* upper 4 bits leds correspond to bits D2..D5 */
+	PORTD = (PORTD & ~ 0x3c) | ( 0x3c & (leds >> 2) );
+	sei();
+}

cobalt_leds.h

@@ -0,0 +1,22 @@
+#ifndef COBALT_LEDS
+#define COBALT_LEDS
+
+#include <stdint.h>
+
+#define COBALT_LED_WEB   (1<<0)
+#define COBALT_LED_DISK  (1<<1)
+#define COBALT_LED_LOGO  (1<<2)
+
+#define COBALT_LED_NET   (0xf0)
+#define COBALT_LED_TXRX  (1<<4)  /* Network LEDs */
+#define COBALT_LED_100M  (1<<5)
+#define COBALT_LED_LINK  (1<<6)
+#define COBALT_LED_COL   (1<<7)
+
+/* initialize ports */
+extern void cobalt_leds_init();
+
+/* light up LEDs, 1=on 0=off */
+extern void cobalt_leds_set(uint8_t leds);
+
+#endif