Add ATTiny24 single-LED experiment firmware

tn24/src/config.h

@@ -0,0 +1,8 @@
+#ifndef CONFIG_H_
+#define CONFIG_H_
+
+#define F_CPU       128000UL
+
+#define MAX_DELAY   600
+
+#endif

tn24/src/main.c

@@ -0,0 +1,94 @@
+#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

@@ -0,0 +1,20 @@
+#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

@@ -0,0 +1,16 @@
+#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