Add ATTiny24 single-LED experiment firmware

tn24/.gitignore

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+build/*
+src/.local.vimrc

tn24/makefile

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+PROJECT = main
+LOCAL_SOURCE_DIR = src
+BUILD_DIR = build
+
+MCU = attiny24
+LFUSE = 0xc4
+HFUSE = 0xdf
+EFUSE = 0xff
+
+FORMAT = ihex
+
+LOCAL_SOURCES = $(wildcard $(LOCAL_SOURCE_DIR)/*.c)
+
+CFLAGS = -mmcu=$(MCU) -Wall -Wstrict-prototypes -gstabs -std=gnu99 -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Os -lm
+
+RM = rm -f
+CC = avr-gcc
+NM = avr-nm
+AVRDUDE = avrdude
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+SIZE = avr-size
+
+LOCAL_OBJECTS = $(patsubst $(LOCAL_SOURCE_DIR)/%.c, $(BUILD_DIR)/%.o, $(LOCAL_SOURCES))
+OBJECTS = $(LOCAL_OBJECTS)
+LOCAL_DEPENDS = $(patsubst $(LOCAL_SOURCE_DIR)/%.c, $(BUILD_DIR)/%.d, $(LOCAL_SOURCES))
+
+.DEFAULT_GOAL = all
+.DELETE_ON_ERROR:
+
+$(LOCAL_OBJECTS): $(BUILD_DIR)/%.o: $(LOCAL_SOURCE_DIR)/%.c
+	$(CC) $^ -c -o $@ $(CFLAGS)
+
+$(LOCAL_DEPENDS): $(BUILD_DIR)/%.d: $(LOCAL_SOURCE_DIR)/%.c
+	@set -e; rm -f $@; $(CC) -MM $(CFLAGS) $< > $@.$$$$; sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; rm -f $@.$$$$
+
+include $(LOCAL_DEPENDS) 
+
+$(BUILD_DIR)/$(PROJECT).elf: $(OBJECTS) | $(BUILD_DIR)
+	$(CC) $(OBJECTS) $(CFLAGS) --output $@
+
+$(BUILD_DIR)/$(PROJECT).hex: $(BUILD_DIR)/$(PROJECT).elf | $(BUILD_DIR)
+	$(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@
+
+$(BUILD_DIR)/$(PROJECT).eep: $(BUILD_DIR)/$(PROJECT).elf | $(BUILD_DIR)
+	-$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" --change-section-lma .eeprom=0 -O $(FORMAT) $< $@
+
+$(BUILD_DIR)/$(PROJECT).lss: $(BUILD_DIR)/$(PROJECT).elf | $(BUILD_DIR)
+	$(OBJDUMP) -h -S $< > $@
+
+$(BUILD_DIR)/$(PROJECT).sym: $(BUILD_DIR)/$(PROJECT).elf | $(BUILD_DIR)
+	$(NM) -n $< > $@
+
+$(LOCAL_DEPENDS): | $(BUILD_DIR)
+$(BUILD_DIR):
+	if [ ! -d "$(BUILD_DIR)" ]; then mkdir "$(BUILD_DIR)"; fi
+
+.PHONY: all
+all: $(BUILD_DIR) $(OBJECTS) $(BUILD_DIR)/$(PROJECT).elf $(BUILD_DIR)/$(PROJECT).hex $(BUILD_DIR)/$(PROJECT).eep $(BUILD_DIR)/$(PROJECT).lss $(BUILD_DIR)/$(PROJECT).sym
+	$(SIZE) $(BUILD_DIR)/$(PROJECT).elf
+
+.PHONY: program
+program: $(BUILD_DIR)/$(PROJECT).hex
+	avrdude -c usbasp -p $(MCU) -U flash:w:$(BUILD_DIR)/$(PROJECT).hex -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m 
+	# avrdude -c usbasp -p $(MCU) -U flash:w:$(BUILD_DIR)/$(PROJECT).hex -U eeprom:w:$(BUILD_DIR)/$(PROJECT).eep -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m 
+
+.PHONY: clean
+clean:
+	$(RM) $(BUILD_DIR)/*

tn24/src/config.h

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+#ifndef CONFIG_H_
+#define CONFIG_H_
+
+#define F_CPU       128000UL
+
+#define MAX_DELAY   600
+
+#endif

tn24/src/main.c

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+#include "main.h"
+
+uint16_t RCounter;
+uint16_t GCounter;
+uint16_t BCounter;
+
+int main(void)
+{
+    DDRA = 0;
+    DDRB = 0;
+    PORTA = 0;
+    PORTB = 0;
+
+    D_LEDR |= (1 << P_LEDR);
+    D_LEDG |= (1 << P_LEDG);
+    D_LEDB |= (1 << P_LEDB);
+    O_LEDR |= (1 << P_LEDR);
+
+    _delay_ms(50);
+
+    O_LEDR &= ~(1 << P_LEDR);
+
+    WDTCSR = (1 << WDIE) | (1 << WDP1);
+
+    RCounter = 10;
+    GCounter = 35;
+    BCounter = 20;
+
+    sei();
+
+    set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+    sleep_mode();
+
+    while(1)
+    {
+    }
+
+    return 1;
+}
+
+ISR(WATCHDOG_vect)
+{
+    if(O_LEDR & (1 << P_LEDR))
+    {
+        O_LEDR &= ~(1 << P_LEDR);
+        RCounter = rand() % MAX_DELAY;
+    }
+    else
+    {
+        RCounter--;
+        if(RCounter == 0)
+        {
+            O_LEDR |= (1 << P_LEDR);
+        }
+    }
+
+    if(O_LEDG & (1 << P_LEDG))
+    {
+        O_LEDG &= ~(1 << P_LEDG);
+        GCounter = rand() % MAX_DELAY;
+    }
+    else
+    {
+        GCounter--;
+        if(GCounter == 0)
+        {
+            O_LEDG |= (1 << P_LEDG);
+        }
+    }
+    
+    if(O_LEDB & (1 << P_LEDB))
+    {
+        O_LEDB &= ~(1 << P_LEDB);
+        BCounter = rand() % MAX_DELAY;
+    }
+    else
+    {
+        BCounter--;
+        if(BCounter == 0)
+        {
+            O_LEDB |= (1 << P_LEDB);
+        }
+    }
+}
+
+uint16_t y = 132457;
+
+uint16_t rand()
+{
+    y ^= y << 13;
+    y ^= y >> 7;
+    y ^= y << 5;
+    return y;
+}

tn24/src/main.h

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+#ifndef MAIN_H_
+#define MAIN_H_
+
+#include "config.h"
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+#include <avr/wdt.h>
+#include <avr/sleep.h>
+#include <stdint.h>
+#include <util/delay.h>
+
+#include "pinning.h"
+
+int main(void);
+
+uint16_t rand();
+
+#endif

tn24/src/pinning.h

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+#ifndef PINNING_H_
+#define PINNING_H_
+
+#define D_LEDR                  DDRA
+#define O_LEDR                  PORTA
+#define P_LEDR                  PA2
+
+#define D_LEDG                  DDRA
+#define O_LEDG                  PORTA
+#define P_LEDG                  PA3
+
+#define D_LEDB                  DDRA
+#define O_LEDB                  PORTA
+#define P_LEDB                  PA1
+
+#endif