From 12688a2578ace9776eadfaae0806eaf4ebec48e6 Mon Sep 17 00:00:00 2001
From: Christian Franke <nobody@nowhere.ws>
Date: Thu, 5 Dec 2013 04:06:23 +0100
Subject: Initial commit

---
 .gitignore |  6 ++++++
 Makefile   | 41 +++++++++++++++++++++++++++++++++++++
 ferment.c  | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 116 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 ferment.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6769eb2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+*.o
+*.flash
+*.eeprom
+*.map
+*.orig
+*.?#?
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b7690cd
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,41 @@
+MCU=atmega32
+AVRDUDE=avrdude
+ACC=avr-gcc
+AOBJCOPY=avr-objcopy
+ALD=avr-ld
+ASIZE=avr-size
+CFLAGS=-Wall -Wextra -Wno-unused-parameter -pedantic -std=c99
+
+ACFLAGS=-g -mmcu=$(MCU) $(CFLAGS) $(DPIN) -Os -mcall-prologues
+# ALDFLAGS=-L/usr/avr/lib/avr4 -L/usr/lib/binutils/avr/2.18
+LD=gcc
+CC=gcc
+CXX=g++ -g
+LDXX=g++ -g
+
+love: ferment.flash ferment.eeprom
+
+%.flash: %.ld.o
+	$(AOBJCOPY) -O binary $< $@
+
+%.eeprom: %.ld.o
+	$(AOBJCOPY) -j .eeprom -O binary $^ $@
+
+%.ld.o: %.o
+	$(ACC) $(ACFLAGS) $(ALDFLAGS) -Wl,-Map,$(patsubst %.ld.o,%.map,$@) -o $@ $<
+	@$(ASIZE) $@
+
+%.o: %.c
+	$(ACC) $(ACFLAGS) -c -o $@ $<
+
+flash: ferment.flash
+	$(AVRDUDE) -y -p m32 -E noreset -U flash:w:$<:r
+eeprom: ferment.eeprom
+	$(AVRDUDE) -y -p m32 -E noreset -U eeprom:w:$<:r
+
+clean:
+	rm -f *.flash *.eeprom *.o
+
+.PHONY: love flash eeprom clean
+.SECONDARY:
+
diff --git a/ferment.c b/ferment.c
new file mode 100644
index 0000000..aba1916
--- /dev/null
+++ b/ferment.c
@@ -0,0 +1,69 @@
+#define F_CPU 1000000UL
+#include <stdint.h>
+#include <string.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/sleep.h>
+#include <avr/pgmspace.h>
+#include <avr/eeprom.h>
+#include <util/delay.h>
+
+/* port D
+ *
+ *  4 1- (NMOS, inverted) 
+ *  5 1+ (PMOS)
+ *  6 2- (NMOS, inverted)
+ *  7 2+ (PMOS)
+ *
+ */
+
+#define D_1_MINUS	(1 << 4)
+#define D_1_PLUS	(1 << 5)
+#define D_2_MINUS	(1 << 6)
+#define D_2_PLUS	(1 << 7)
+
+/* Turns the H-bridge off, putting the output
+ * into high impedance mode. */
+static void bridge_off(void)
+{
+	PORTD |= D_1_MINUS | D_2_MINUS;
+	PORTD &= ~(D_1_PLUS | D_2_PLUS);
+}
+
+/* Turns the H-bridge on, setting 1+ 2- */
+static void bridge_on_a(void)
+{
+	bridge_off();
+	_delay_ms(100);
+	PORTD |= D_1_PLUS;
+	PORTD &= ~D_2_MINUS;
+}
+
+/* Turns the H-bridge on, setting 1- 2+ */
+static void bridge_on_b(void)
+{
+	bridge_off();
+	_delay_ms(100);
+	PORTD |= D_2_PLUS;
+	PORTD &= ~D_1_MINUS;
+}
+
+/* Initializes the output port needed for the H-bridge */
+static void bridge_init(void)
+{
+	bridge_off();
+	DDRD |= D_1_PLUS | D_1_MINUS | D_2_PLUS | D_2_MINUS;
+}
+
+int main()
+{
+	bridge_init();
+	/* simple demo, just flips polarity every now and then */
+	while (1) {
+		bridge_on_a();
+		_delay_ms(200);
+		bridge_on_b();
+		_delay_ms(200);
+	}
+}
+
-- 
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