From 2755b4c6000c4de64d83921bdb109077f4b38597 Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Thu, 30 Jan 2014 15:29:05 +0100
Subject: [PATCH] Rudimentary firmware infrastructure.

---
 firmware/.gitignore |  5 ++++
 firmware/Makefile   | 68 +++++++++++++++++++++++++++++++++++++++++++++
 firmware/main.c     | 33 ++++++++++++++++++++++
 firmware/version.pl | 32 +++++++++++++++++++++
 4 files changed, 138 insertions(+)
 create mode 100644 firmware/.gitignore
 create mode 100644 firmware/Makefile
 create mode 100644 firmware/main.c
 create mode 100755 firmware/version.pl

diff --git a/firmware/.gitignore b/firmware/.gitignore
new file mode 100644
index 0000000..7b29fe9
--- /dev/null
+++ b/firmware/.gitignore
@@ -0,0 +1,5 @@
+heater.eep
+heater.elf
+heater.hex
+*.o
+version.c
diff --git a/firmware/Makefile b/firmware/Makefile
new file mode 100644
index 0000000..da02dbb
--- /dev/null
+++ b/firmware/Makefile
@@ -0,0 +1,68 @@
+
+PROGRAM=heater
+SRC=version.c main.c
+OBJ=$(SRC:.c=.o)
+
+
+MCU=attiny25
+AVRDUDE_MCU=$(MCU)
+AVRDUDE_PROGRAMMER=usbasp
+
+CFLAGS=-Wall -Os -mmcu=$(MCU) -DUSE_LOGGING=1 -DF_CPU=1000000UL -std=gnu99
+LDFLAGS=
+AVRDUDE_FLAGS= -p$(AVRDUDE_MCU) -B 3 -c $(AVRDUDE_PROGRAMMER)
+
+FORMAT=ihex
+
+CC=avr-gcc
+OBJCOPY=avr-objcopy
+OBJDUMP=avr-objdump
+AVRDUDE=avrdude
+
+all: $(PROGRAM).hex $(PROGRAM).eep
+
+program: $(PROGRAM).hex $(PROGRAM).eep
+	$(AVRDUDE) $(AVRDUDE_FLAGS) -U flash:w:$(PROGRAM).hex:i -U eeprom:w:$(PROGRAM).eep:i
+
+program_flash: $(PROGRAM).hex
+	$(AVRDUDE) $(AVRDUDE_FLAGS) -U flash:w:$(PROGRAM).hex:i
+
+program_eeprom: $(PROGRAM).eep
+	$(AVRDUDE) $(AVRDUDE_FLAGS) eeprom:w:$(PROGRAM).eep:i
+
+dump_eeprom:
+	$(AVRDUDE) $(AVRDUDE_FLAGS) -U eeprom:r:eeprom.raw:r
+	od -tx1 eeprom.raw
+
+objdump: $(PROGRAM).elf
+	$(OBJDUMP) --disassemble $<
+
+.PRECIOUS : $(OBJ) $(PROGRAM).elf
+
+%.hex: %.elf
+	$(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@
+
+%.eep: %.elf
+	$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
+		--change-section-lma .eeprom=0 -O $(FORMAT) $< $@
+
+%.elf: $(OBJ)
+	$(CC) $(CFLAGS) $(OBJ) -o $@ $(LDFLAGS)
+
+%.o: %.c lights.h Makefile
+	$(CC) -c $(CFLAGS) $< -o $@
+
+%.s: %.c lights.h Makefile
+	$(CC) -S -c $(CFLAGS) $< -o $@
+
+%.o: %.S
+	$(CC) -c $(CFLAGS) $< -o $@
+
+clean:
+	rm -f $(PROGRAM).hex $(PROGRAM).eep $(PROGRAM).elf *.o *.s eeprom.raw
+
+version.c:
+	./version.pl > version.c
+
+.PHONY: all clean dump_eeprom program program_flash program_eeprom objdump version.c
+
diff --git a/firmware/main.c b/firmware/main.c
new file mode 100644
index 0000000..30f904b
--- /dev/null
+++ b/firmware/main.c
@@ -0,0 +1,33 @@
+#include <avr/io.h>
+#include <avr/eeprom.h>
+#include <util/delay.h>
+
+static uint16_t adcval EEMEM;
+
+int main()
+{
+	DDRB |= _BV(PB2) | _BV(PB4);
+	TCCR1 = _BV(CS10); // clk/1 = 1 MHz
+	// TCCR1 = _BV(CS11) | _BV(CS13); // clk/512 = 2 kHz
+	GTCCR = _BV(COM1B1) | _BV(PWM1B);
+	OCR1C = 255;
+	OCR1B = 9;
+
+	ADCSRA = _BV(ADEN) | _BV(ADPS1) | _BV(ADPS0); // clk/8 = 125 kHz
+	ADMUX = _BV(REFS1) | _BV(MUX1) | _BV(MUX0); // 1.1V ref., PB3 single-ended
+	DIDR0 = _BV(ADC3D);
+	ADCSRA |= _BV(ADSC);
+	while (!(ADCSRA & _BV(ADIF)))
+		;
+	ADCSRA |= _BV(ADSC);
+	while (!(ADCSRA & _BV(ADIF)))
+		;
+	eeprom_write_word(&adcval, ADCW);
+
+	while(1) {
+		PORTB |= _BV(PB2);
+		_delay_ms(500);
+		PORTB &= ~_BV(PB2);
+		_delay_ms(1000);
+	}
+}
diff --git a/firmware/version.pl b/firmware/version.pl
new file mode 100755
index 0000000..cb4ecc7
--- /dev/null
+++ b/firmware/version.pl
@@ -0,0 +1,32 @@
+#!/usr/bin/perl -w
+
+use strict;
+use POSIX qw(strftime);
+
+my $git = `git rev-parse --short HEAD`;
+chomp $git;
+
+my $now = strftime('%Y%m%d', localtime(time));
+
+print <<EOF;
+/* DO NOT EDIT - GENERATED BY $0 */
+
+#include <avr/eeprom.h>
+
+unsigned char version[] EEMEM = {
+EOF
+
+print hex2c($git, "git revision");
+print hex2c($now, "date");
+
+print "};\n\n/* EOF - this file has not been truncated */\n\n";
+
+sub hex2c {
+	my ($data, $comment) = @_;
+
+	my $data1 = $data;
+	$data1 .= '0' if (length($data1) & 1 == 1);
+	$data1 =~ s/(..)/0x$1, /g;
+	return "\t$data1 /* $comment $data */\n";
+}
+
-- 
2.43.5