From 81ff282291527178abab4ab63b22065d6eb3cb2f Mon Sep 17 00:00:00 2001
From: Bluebie <a@creativepony.com>
Date: Thu, 4 Oct 2012 11:26:39 +1000
Subject: Added viral in place upgrader tool, to upgrade bootloaders via the
 bootloader itself (should work with any attiny85 bootloader I think, in
 either direction)

---
 upgrade/utils.h | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 upgrade/utils.h

(limited to 'upgrade/utils.h')

diff --git a/upgrade/utils.h b/upgrade/utils.h
new file mode 100644
index 0000000..c84ee56
--- /dev/null
+++ b/upgrade/utils.h
@@ -0,0 +1,90 @@
+#include <util/delay_basic.h>
+#include <avr/io.h>
+
+// For the niceness
+typedef unsigned char byte;
+typedef unsigned char boolean;
+
+// make bit & value, eg bit(5) #=> 0b00010000
+#define bit(number) _BV(number)
+#define pin(number) _BV(number)
+
+// USI serial aliases
+#define USIOutputPort    PORTE
+#define USIInputPort     PINE
+#define USIDirectionPort DDRE
+#define USIClockPin      PE4
+#define USIDataInPin     PE5
+#define USIDataOutPin    PE6
+
+// booleans
+#define    on 255
+#define   off 0
+#define  true 1
+#define false 0
+#define   yes true
+#define    no false
+
+// ensure a value is within the bounds of a minimum and maximum (inclusive)
+#define constrainUpper(value, max) (value > max ? max : value)
+#define constrainLower(value, min) (value < min ? min : value)
+#define constrain(value, min, max) constrainLower(constrainUpper(value, max), min)
+#define multiplyDecimal(a,b) (((a) * (b)) / 256)
+
+// set a pin on DDRB to be an input or an output - i.e. becomeOutput(pin(3));
+#define inputs(pinmap) DDRB &= ~(pinmap)
+#define outputs(pinmap) DDRB |= (pinmap)
+
+// turn some pins on or off
+#define pinsOn(pinmap) PORTB |= (pinmap)
+#define pinsOff(pinmap) PORTB &= ~(pinmap)
+#define pinsToggle(pinmap) PORTB ^= pinmap
+
+// turn a single pin on or off
+#define pinOn(pin) pinsOn(bit(pin))
+#define pinOff(pin) pinsOff(bit(pin))
+// TODO: Should be called pinToggle
+#define toggle(pin) pinsToggle(bit(pin))
+
+// delay a number of microseconds - or as close as we can get
+#if F_CPU == 16500000
+  // special version to deal with half-mhz speed. in a resolution of 2us increments, rounded up
+  // this loop has been tuned empirically with an oscilloscope and works in avr-gcc 4.5.1
+  static inline void microdelay(int microseconds) {
+    while (microseconds > 1) {
+      // 16 nops
+      asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");
+      asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");
+      // 16 nops
+      asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");asm("NOP");
+      asm("NOP");asm("NOP");asm("NOP");
+
+
+      microseconds -= 2;
+    }
+  }
+#else
+  #define microdelay(microseconds) _delay_loop_2(((microseconds) * (F_CPU / 100000)) / 40)
+#endif
+
+// delay in milliseconds - a custom implementation to avoid util/delay's tendancy to import floating point math libraries
+inline void delay(unsigned int ms) {
+  while (ms > 0) {
+    // delay for one millisecond (250*4 cycles, multiplied by cpu mhz)
+    // subtract number of time taken in while loop and decrement and other bits
+    _delay_loop_2((25 * F_CPU / 100000));
+    ms--;
+  }
+}
+
+
+
+// digital read returns 0 or 1
+#define get(pin) ((PINB >> pin) & 0b00000001)
+#define getBitmap(bitmap) (PINB & bitmap)
+static inline void set(byte pin, byte state) {
+  if (state) { pinOn(pin); } else { pinOff(pin); }
+  // alternatly:
+  // PORTB = (PORTB & ~(bit(pin)) | ((state & 1) << pin);
+}
+
-- 
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