OTA Bootloader

- including adjustments to  library header files to allow usage across C
(bootloader) and C++ (firmware sketches)
- including definition of new message types for firmware config and
firmware code

Bootloader/MyOtaBootloaderHW.h

@@ -0,0 +1,154 @@
+#ifndef MyOtaBootloaderHW_H
+#define MyOtaBootloaderHW_H
+
+#include <stdlib.h>
+#include <avr/power.h>
+
+//#define LED_DEBUG
+//#define UART_DEBUG
+
+// hardware
+// ********
+
+#define F_CPU_DIV	clock_div_4
+#define F_CPU_REAL	F_CPU / (1 << F_CPU_DIV)
+#define UART_BAUD	9600UL
+#define DELAY_M		125 * (1 << F_CPU_DIV)
+
+// boolean definition
+// ******************
+
+typedef uint8_t bool;
+typedef uint8_t boolean;
+#define false 	0x0
+#define true 	0x1
+#define LOW 	0x0
+#define HIGH 	0x1
+
+// delay
+// *****
+
+static void delayu() {
+	asm("nop"); 
+}
+
+static void delaym(uint16_t t) {
+	uint16_t d, a;
+	for (d = 0; d < t; d++)
+		for (a = 0; a < DELAY_M; a++)
+			asm("nop"); 
+}
+
+// LED debug
+// *********
+
+#ifdef LED_DEBUG
+#define LED_DDR			DDRD
+#define LED_PORT		PORTD
+#define	LED_RED			6		// Arduino Pin 6 <-> Bit 6 of port D
+#define	LED_GREEN		7		// Arduino Pin 7 <-> Bit 7 of port D
+#define	LED_MRED		(1 << LED_RED)
+#define	LED_MGREEN		(1 << LED_GREEN)
+#define	LED_MBOTH		(LED_MRED | LED_MGREEN)
+
+static void led_init() {
+	LED_DDR |= LED_MBOTH;
+	LED_PORT &= ~LED_MBOTH;
+}
+
+static void blink(uint8_t mask, uint16_t time) {
+	LED_PORT |= mask;
+	if (time > 0)
+	{
+		delaym(time);
+		LED_PORT &= ~mask;
+		delaym(time);
+	}
+}
+#endif
+  
+// UART debug
+// **********
+
+#ifdef UART_DEBUG
+static void uart_init()
+{
+	UCSR0A = _BV(U2X0); //Double speed mode USART0
+	UCSR0B = _BV(RXEN0) | _BV(TXEN0);
+	UCSR0C = _BV(UCSZ00) | _BV(UCSZ01);
+	UBRR0L = (uint8_t)( (F_CPU_REAL + UART_BAUD * 4L) / (UART_BAUD * 8L) - 1 );
+}
+
+static void uart_putc(char ch) {
+	while (!(UCSR0A & _BV(UDRE0)));
+	UDR0 = ch;
+}
+  
+static void uart_puts(char *s)
+{
+	while (*s)
+		uart_putc(*s++);
+}
+
+static void uart_puti(uint8_t i)
+{
+	char s[5];
+	itoa( i, s, 10 );
+	uart_puts( s );
+}
+#endif
+
+// SPI communication
+// *****************
+
+#define SPI_DDR		DDRB
+#define SPI_PORT	PORTB
+#define SPI_PIN		PINB
+#define	SPI_SCLK	5		// Arduino Pin 13 <-> Bit 5 of port B
+#define	SPI_MISO	4		// Arduino Pin 12 <-> Bit 4 of port B
+#define	SPI_MOSI	3		// Arduino Pin 11 <-> Bit 3 of port B
+#define	SPI_CSN		2		// Arduino Pin 10 <-> Bit 2 of port B
+#define	SPI_CE		1		// Arduino Pin  9 <-> Bit 1 of port B
+
+#define csnlow() SPI_PORT &= ~(1<<SPI_CSN);delaym(1)
+#define csnhigh() SPI_PORT |= (1<<SPI_CSN);delaym(1)
+#define celow() SPI_PORT &= ~(1<<SPI_CE);delaym(1)
+#define cehigh() SPI_PORT |= (1<<SPI_CE);delaym(1)
+
+static void SPIinit()
+{
+	SPI_DDR |= (1 << SPI_MOSI) + (1 << SPI_SCLK) + (1 << SPI_CE) + (1 << SPI_CSN);
+	SPI_DDR &= ~(1 << SPI_MISO);
+	SPI_PORT &= ~((1 << SPI_MOSI) + (1 << SPI_SCLK) + (1 << SPI_CE));
+	SPI_PORT |= (1 << SPI_CSN);
+}
+
+static uint8_t SPItransfer(uint8_t value)
+{
+	uint8_t i;
+	for(i = 0 ;i < 8;i++) {
+		delayu();
+		if ((value & 0x80) == 0x00)
+			SPI_PORT &= ~(1 << SPI_MOSI);
+		else
+			SPI_PORT |= (1 << SPI_MOSI);
+		value = (value << 1);    // shift next bit into MSB..
+		delayu();
+		SPI_PORT |= (1 << SPI_SCLK);
+		value |= ((SPI_PIN >> SPI_MISO) & 0x01);     // capture current MISO bit
+		delayu();
+		SPI_PORT &= ~(1 << SPI_SCLK);
+		delayu();
+	}
+	return value;
+}
+
+static uint8_t spiTrans(uint8_t cmd){
+  uint8_t status;
+  csnlow();
+  status = SPItransfer( cmd );
+  csnhigh();
+  return status;
+}
+
+#endif // MyOtaBootloaderHW_H