added the makefile for building the program

flash_atiny13.ps1

@@ -0,0 +1,54 @@
+# PowerShell script to flash a precompiled HEX file via avrdude.exe with a USBasp programmer
+
+# Path to avrdude.exe
+# $AvrdudePath = "C:\path\to\avrdude.exe"
+$AvrdudePath = "avrdude.exe"
+
+
+# Path to the USBasp configuration file (avrdude.conf)
+$AvrdudeConf = "avrdude.conf"
+
+# Path to the HEX file to be flashed
+$HexFile = "pre_built\atiny13_4-8.hex"
+
+# USBasp programmer options
+$ProgrammerOptions = "-c usbasp"
+
+# Microcontroller options (replace with the appropriate values for your microcontroller)
+$MCU = "-p attiny13"
+$BaudRate = "-B 10"
+
+# Check if avrdude.exe exists
+if (-not (Test-Path $AvrdudePath -PathType Leaf)) {
+    Write-Error "Error: avrdude.exe not found. Please set AvrdudePath in the script."
+    exit 1
+}
+
+# Check if the avrdude configuration file exists
+if (-not (Test-Path $AvrdudeConf -PathType Leaf)) {
+    Write-Error "Error: avrdude.conf not found. Please set AvrdudeConf in the script."
+    exit 1
+}
+
+# Check if the HEX file exists
+if (-not (Test-Path $HexFile -PathType Leaf)) {
+    Write-Error "Error: HEX file not found. Please set HexFile in the script."
+    exit 1
+}
+
+# Build avrdude command
+$AvrdudeCommand = "$AvrdudePath -C $AvrdudeConf $ProgrammerOptions $MCU $BaudRate -U flash:w:$HexFile"
+
+# Run avrdude command
+Write-Host "Flashing HEX file..."
+Invoke-Expression $AvrdudeCommand
+
+# Check avrdude exit code
+if ($LASTEXITCODE -eq 0) {
+    Write-Host "Flashing completed successfully."
+} else {
+    Write-Host "Flashing failed. Check avrdude output for details."
+}
+
+# Exit with avrdude exit code
+exit $LASTEXITCODE

main.c

@@ -0,0 +1,420 @@
+/*
+ * FileName: *.c
+ * Date: 2023
+ * Descripton: Program for Atiny13A controllers, controls DPDT relays and
+ * has options to save settings in EEPROM.
+ */
+
+#ifndef MCU
+#define MCU atiny13a
+#endif
+
+#ifndef F_CPU
+#define F_CPU 4800000UL
+#endif
+
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <avr/eeprom.h>
+
+//These are just defined in case for compatability with Arduino
+#ifndef HIGH
+#define HIGH 1
+#endif
+
+#ifndef LOW
+#define LOW 0
+#endif
+
+#ifndef UINT8_MAX
+#define UINT8_MAX 256
+#endif
+
+//This is the bitpattern that should be at address 0x00
+#define START_PATTERN 0xAA
+#define END_PATTERN 0x55
+
+//Addresses in the eeprom for the two bypasses
+#define ROM_SP_ADR      0x0
+#define ROM_BP1_ADR     0x1
+#define ROM_BP2_ADR     0x2
+#define ROM_EP_ADR      0x3
+
+//Debounce check number.
+#define MAX_CHECKS 10
+
+// Define DISABLE_TEMPORARY_SWITCH to turn off the ability to hold
+// the switch to temporarily engage/bypass.
+//#define DISABLE_TEMPORARY_SWITCH
+
+#define PIN_SW2     PINB3
+#define PIN_BYPASS2 PB4
+#define PIN_SW1     PINB2
+#define PIN_BYPASS1 PB1
+#define PIN_MUTE    PB0
+
+//The BLINK_QTY can be edited from 0-255 blinks
+#define BLINK_QTY   2
+#define BLINK_CNT 2 * BLINK_QTY
+#define BLINK_DELAY     200
+
+
+
+/*The timing of "ticks" is dependent on the AVR timer's counter register
+ * so for an 8bit register the maximum value is 256. Given we stick with
+ * a 1Mhz cpu frequency can use this formula to calculate the number of
+ * interrupts(timer overflows) per second:
+ *
+ * OVF_S = (F_CPU / DIV)/ (2^8)
+ * 61 = (1000000 / 64) / 256
+ *
+ * This is important because the ATiny13/A only have a single timer built into
+ * them.
+ *
+ * Ticks are used as our way of keep track of long button presses.
+ * */
+#define LONG_PRESS_TICKS 60
+
+
+/*A structure to hold the button info*/
+typedef struct {
+    uint8_t is_pressed: 1;
+    uint8_t is_bypassed: 1;
+    uint8_t is_long_pressed: 1;
+    uint8_t timer_enabled: 1;
+    uint8_t pressed_ticks;
+    uint8_t input_pin;
+    uint8_t output_pin;
+}btn_state; 
+
+
+/*
+ * ###############################
+ * Global Variables 
+ * ###############################
+ */
+
+
+/*Create two diffent instances of the button state structure*/
+btn_state btn1;
+btn_state btn2;
+
+/*Some variables for managing the debouncing*/
+volatile uint8_t debounced_state;
+volatile uint8_t db_state[MAX_CHECKS];
+volatile uint8_t idx;
+
+volatile uint16_t tick_count;
+
+/*
+ * ###############################
+ * FUNCTION PROTOTYPES
+ * ###############################
+ */
+
+static void toggle_output(btn_state *b);
+static inline void init_btn(btn_state *b, uint8_t input_pin, uint8_t output_pin);
+static void clear_button_timer(btn_state *b);
+static inline void start_button_timer(btn_state *b);
+static inline void check_button_longpress(btn_state *b);
+static void update_button_output(btn_state *b);
+static void update_button_input(btn_state *b);
+
+static inline void blink_bypass1(void);
+static inline void blink_bypass2(void);
+
+static inline void init_timer0();
+static inline void debounce_switch();
+/*
+ * ###############################
+ * SETUP AND LOOP
+ * ###############################
+ */
+void init_prog()
+{
+    /*Set the debounced state to all high*/
+    debounced_state = 0xFF;
+  
+    /*Configures the PINS for the input and output.*/
+    init_btn(&btn1, PIN_SW1, PIN_BYPASS1);
+    init_btn(&btn2, PIN_SW2, PIN_BYPASS2);
+    
+    /*Wait 5ms for pull-up resistors voltage to become stable.*/
+    _delay_ms(5);
+
+    /*check if the eeprom has info. */
+    while(! eeprom_is_ready()) {} //Blocks until eeprom is ready.
+
+    //Checks against a bit pattern we defined to represent the start of data.
+    if(eeprom_read_byte((uint8_t *)ROM_SP_ADR) == START_PATTERN) {
+        //Reads the two bytes representing the two states.       
+        btn1.is_bypassed = eeprom_read_byte((uint8_t *)ROM_BP1_ADR);
+        btn2.is_bypassed = eeprom_read_byte((uint8_t *)ROM_BP2_ADR);
+    }
+    else {
+        //otherwise we write the init values for the start pattern and bypass states.
+        eeprom_write_byte((uint8_t *)ROM_SP_ADR, START_PATTERN);
+        eeprom_write_byte((uint8_t *)ROM_BP1_ADR, 0x0);
+        eeprom_write_byte((uint8_t *)ROM_BP2_ADR, 0x0);
+    }
+
+    btn1.is_pressed = ((PINB & (1<<btn1.input_pin))  == 0);
+    btn2.is_pressed = ((PINB & (1<<btn2.input_pin))  == 0);
+
+
+    /*This is to read if the user wants to change the saved states.*/
+    /*Manually read the current switch state*/
+    if(btn1.is_pressed){
+        btn1.is_bypassed = ! btn1.is_bypassed;
+        eeprom_write_byte((uint8_t *)ROM_BP1_ADR, btn1.is_bypassed);
+        blink_bypass1();
+    }
+    if(btn2.is_pressed){
+        btn2.is_bypassed = ! btn2.is_bypassed;
+        eeprom_write_byte((uint8_t *)ROM_BP2_ADR, btn2.is_bypassed);
+        blink_bypass2();
+    }    
+
+    if(btn1.is_bypassed){PORTB |= (1<<btn1.output_pin);}
+    if(btn2.is_bypassed){PORTB |= (1<<btn2.output_pin);}
+
+    init_timer0(); 
+}
+
+int main()
+{
+
+  init_prog();
+   
+  while(1){   
+    update_button_output(&btn1);
+    update_button_output(&btn2);
+  
+    update_button_input(&btn1);
+    update_button_input(&btn2); 
+  }
+  return 0;
+}
+
+
+/*
+ * ###############################
+ * FUNCTION DEFs
+ * ###############################
+ */
+
+void inf_blink_test(){
+    DDRB |= (1<<PB3);
+    while(1){
+        PORTB ^= (1<<PB3);
+        _delay_ms(250);
+    }
+}
+
+
+//Made heavy use of static inline functions to improve readability.
+
+static inline void blink_bypass1(void)
+{
+    for(uint8_t i = 0; i < BLINK_CNT; i++) {
+        PORTB ^= (1<<PIN_BYPASS1);
+        _delay_ms(BLINK_DELAY);
+    }
+}
+
+static inline void blink_bypass2(void)
+{
+    for(uint8_t i = 0; i < BLINK_CNT; i++) {
+        PORTB ^= (1<<PIN_BYPASS2);
+        _delay_ms(BLINK_DELAY);
+    }
+}
+
+/*
+ * ############################
+ * BUTTON methods 
+ * ############################
+ */ 
+
+/*This is kinda like our button constructor*/
+static void init_btn(btn_state *b, uint8_t input_pin, uint8_t output_pin)
+{
+    b->is_long_pressed = 0;
+    b->is_pressed = 0;
+    b->is_bypassed = 0;
+    b->pressed_ticks = 0;
+    b->timer_enabled = 0;
+    b->input_pin = input_pin;
+    b->output_pin = output_pin;
+
+    /*Configure the buttons inputs and outputs*/
+    DDRB &= ~(1<<b->input_pin);
+    PORTB |= (1<<b->input_pin);
+    
+    DDRB |= (1<<b->output_pin);
+    PORTB &= ~(1<<b->output_pin);
+}
+
+/*This is the fancy function to toggle output pins*/
+static void toggle_output(btn_state *b)
+{
+    if(!b->is_bypassed){
+        b->is_bypassed = 1;
+        PORTB |= (1<<b->output_pin);
+    }
+    else{
+        b->is_bypassed = 0;
+        PORTB &= ~(1<<b->output_pin);
+    }
+}
+
+static void clear_button_timer(btn_state *b)
+{
+    b->timer_enabled = 0;
+    b->is_long_pressed = 0;
+    b->pressed_ticks = 0;
+}
+
+static void start_button_timer(btn_state *b)
+{
+    clear_button_timer(b);
+    b->timer_enabled = 1;
+}
+
+static void check_button_longpress(btn_state *b)
+{
+    if(b->pressed_ticks >= LONG_PRESS_TICKS) {
+        b->is_long_pressed = 1;
+        b->timer_enabled = 0;
+    }
+}
+
+static void update_button_input(btn_state *b)
+{
+    /*Check from the global debounced port input*/
+    
+    /*check for pin HIGH*/
+    if(debounced_state & (1<<b->input_pin)) {
+        b->is_pressed = 0;
+    }
+    /*otherwise assume pin LOW*/
+    else{
+        b->is_pressed = 1;
+    }
+}
+
+static void update_button_output(btn_state *b)
+{
+    /*If the button is actually pressed.*/
+    if(b->is_pressed){
+        
+        /*If this is a new event.*/
+        if(!b->is_long_pressed && !b->timer_enabled){
+            /*Then start the timer and update the output*/
+            toggle_output(b);
+            start_button_timer(b);
+            return;
+        }
+
+        /*If the timer is already going.*/
+        else if(b->timer_enabled){
+            /*Then just check if it's hit the threshold.*/
+            check_button_longpress(b);
+            return;
+        }
+
+        else{
+            return;
+        }
+    }
+
+    /*Else the button was realeased*/
+    else if(!b->is_pressed){
+        /*If the button was released on a long press.*/
+        if(b->is_long_pressed){
+            toggle_output(b);
+        }
+        clear_button_timer(b);
+    }
+}
+
+
+/*
+ * ############################
+ * DEBOUNCING CODE 
+ * ############################
+ */ 
+
+/*
+ * INPUT: The port to check.
+ * OUTPUT: None
+ * DESCRIPTION: Updates the global debounced state. This function
+ * should be called in a ISR a set rate using the hardware timer.
+ */
+static inline void debounce_switch() {
+    uint8_t i, j;
+    db_state[idx] = PINB & 0xFF;
+    idx+=1;
+    j = 0xff;    
+    /*Loop through a number of checks*/
+    for(i = 0; i < MAX_CHECKS; i++) {
+        j = j & db_state[i];
+    }
+    debounced_state = j;
+
+    if(idx >= MAX_CHECKS) {
+        idx = 0;
+    }
+}
+
+
+
+/*Setup the timer0 on the AVR*/
+static inline void init_timer0() { 
+    /*Zero out the tick_count var*/
+    tick_count = 0;
+
+    /*config to normal mode.*/
+    TCCR0A = 0x00;  //stop timer
+    TCCR0B = 0x00;  //zero timer
+
+    /*set prescaler*/
+    //TCCR0B |= (1<<CS00)|(1<<CS02);
+    TCCR0B |= (1<<CS01)|(1<<CS00);
+    //TCCR0B |= (1<<CS01);
+
+    
+    /*Enable global interrupts*/
+    sei();
+
+    /*Enabling timer0 interrupt*/
+    TCNT0 = 0;
+    TIMSK0 |= (1<<TOIE0);
+}
+
+
+//ISR(TIMER0_OVF_vect)
+
+/*The interrupt service routine for the timer0*/
+ISR(TIM0_OVF_vect)
+{
+    /*Disable global interrupts*/
+    cli();
+
+    /*Update the tick_count*/
+    if(btn1.timer_enabled && btn1.pressed_ticks <= UINT8_MAX){
+        btn1.pressed_ticks += 1;
+    }
+
+    if(btn2.timer_enabled && btn2.pressed_ticks <= UINT8_MAX){
+        btn2.pressed_ticks += 1;
+    }
+
+    /*Check the state of the switches*/
+    debounce_switch();
+
+    /*Re-Enable global interrupts*/
+    sei();
+}

makefile

@@ -0,0 +1,60 @@
+# Author: Jake Goodwin
+# DATE: 2023-12-07
+# Descripion: A simple makefile for building and flashing hex files
+
+# Makefile for ATtiny13A
+
+# Compiler
+CC = avr-gcc
+
+#Default cpu frequency is 9.8Mhz, 4.8 gives us less power consumption
+#F_CPU = 4800000UL
+F_CPU = 9800000UL
+MCU = attiny13a
+
+# Flags
+CFLAGS = -g -Os -mmcu=$(MCU) -DF_CPU=$(F_CPU)
+LDFLAGS = -Wl,-Map,$(TARGET).map
+
+# Source files
+SRC = main.c
+
+# Object files
+OBJ = $(SRC:.c=.o)
+
+# Target HEX file
+TARGET = main
+
+# Flashing options
+AVRDUDE = avrdude
+AVRDUDE_PROGRAMMER = -c usbasp
+BUADRATE = -B 125kHz
+AVRDUDE_PORT = -P /dev/ttyUSB0
+AVRDUDE_MCU = -p $(MCU)
+
+
+# Compile and generate HEX file
+all: $(TARGET).hex
+
+$(TARGET).hex: $(TARGET).elf
+	avr-objcopy -j .text -j .data -O ihex $< $@
+
+$(TARGET).elf: $(OBJ)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+size: $(TARGET).o
+	avr-size --mcu=$(MCU) -t ./$(TARGET).o 
+flash_defualt_fuses:
+	$(AVRDUDE) $(AVRDUDE_PROGRAMMER) $(AVRDUDE_PORT) $(AVRDUDE_MCU) $(BUADRATE) -U lfuse:w:0x6A:m -U hfuse:w:0xFF:m -U lock:w:0xFF:m
+flash_slow_fuse:
+	$(AVRDUDE) $(AVRDUDE_PROGRAMMER) $(AVRDUDE_PORT) $(AVRDUDE_MCU) $(BUADRATE) -U lfuse:w:0x69:m -U hfuse:w:0xFF:m -U lock:w:0xFF:m
+flash: $(TARGET).hex
+	$(AVRDUDE) $(AVRDUDE_PROGRAMMER) $(AVRDUDE_PORT) $(AVRDUDE_MCU) $(BUADRATE) -U flash:w:$(TARGET).hex:i
+
+clean:
+	rm -f $(OBJ) $(TARGET).elf $(TARGET).hex $(TARGET).map
+
+.PHONY: all clean
+

pre_built/atiny13_4-8Mhz.hex

@@ -0,0 +1,65 @@
+:1000000009C016C015C067C113C012C011C010C00E
+:100010000FC00EC011241FBECFE9CDBF20E0A0E667
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+:1003E0000FB6F894E29AE19A0FBE01960895F89438
+:0203F000FFCF3D
+:00000001FF

pre_built/atiny13_9-8Mhz.hex

@@ -0,0 +1,65 @@
+:1000000009C016C015C067C113C012C011C010C00E
+:100010000FC00EC011241FBECFE9CDBF20E0A0E667
+:10002000B0E001C01D92A637B207E1F79ED1DFC153
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+:10004000438397B321E030E0A90101C0440F6A95D2
+:10005000EAF7842F8095892387BB48B3C9010280C2
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+:1000A0000BC09260908328B381E090E001C0880F7C
+:1000B0003A95EAF7822B0BC09D7F908328B381E0AD
+:1000C00090E001C0880F3A95EAF78095822388BBBB
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pre_built/atiny13a_4-8Mhz.hex

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pre_built/atiny13a_9-8Mhz.hex

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