MYSBootloader.c

/* 
 * MYSBootloader 1.3.0-rc.1
 * OTA RF24 bootloader for MySensors: https://www.mysensors.org
 * Based on MySensors library 2.2
 * Developed and maintained by tekka 2018
 * 
 * Tested with MYSController https://www.mysensors.org/controller/myscontroller
 * MCU: ATmega328p
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *   
 * ******************************************************************************************************
 * History
 * 
 * v1.3.0-rc.1
 * - Add message length verification
 * - Stripped away RF24 communication driver redundancies and generics
 * - General maintenance, .hex update
 *
 * v1.3.0-beta.4
 * - Code optimization => reintroduction of bootloader commands: Akubi
 *
 * v1.3.0-beta.3
 * - Optimization / Refactorings
 * 
 * v1.3pre
 * - redesign update process
 * - implement STK500 protocol / serial upload
 * - preferred parent with fallback option
 * - save MCUSR, can be retrieved by application
 *
 * v1.2
 * - internal version, PoC
 * 
 * v1.1
 * - use eeprom_update instead of eeprom_write to reduce wear out
 * - bootloader commands: erase eeprom, set node id
 * - verify incoming FW blocks for type & address
 * - communicate over static parent (if set and found) else broadcast to find nearest node
 * - adjusted timings 
 * 
 * v1.0
 * - initial release
 *
 * Info:
 * BL size max. 2048 bytes - FLASH segment setting: .text=0x3C00
 *
 */

// RF24 communication settings *****************************************************************************************
#define RF24_CHANNEL		(76)			// RF channel for the sensor net, 0-127; default 76
#define RF24_DATARATE		RF24_250KBPS	// RF24_250KBPS for 250kbs, RF24_1MBPS for 1Mbps, or RF24_2MBPS for 2Mbps
#define RF24_PA_LEVEL		RF24_PA_MAX		// PA level, RF24_PA_MIN=-18dBm, RF24_PA_LOW=-12dBm, RF24_PA_HIGH=-6dBM, and RF24_PA_MAX=0dBm
#define RF24_ADDR_WIDTH		(5)
#define RF24_BASE_RADIO_ID	0x00,0xFC,0xE1,0xA8,0xA8
#define RF24_ARC			(15)			// Auto Retransmit Counts, see nRF24L01+ data sheet
#define RF24_ARD			(5)				// Auto Retransmit Delay, 5=1500us, see nRF24L01+ data sheet

// Options *************************************************************************************************************
#define WATCHDOG_ON_SKETCH_START			// WDT on when application starts
#define WDT_TIMEOUT			WATCHDOG_8S		// WDT timeout
#define BOOTLOADER_COMMANDS					// Enable low level bootloader commands

// SPI bus setting *****************************************************************************************************
#define SPI_PINS_CE9_CSN10							
//define SPI_PINS_CSN7_CE8
//define SPI_PINS_CE7_CSN10

// LED settings ********************************************************************************************************
#define LED_DDR     DDRB
#define LED_PORT    PORTB
#define LED_PIN		PINB5 //NRFDuino uses PIN 9 (PB1)

// DEBUG settings ******************************************************************************************************
//#define DEBUG
#define DEBUG_PORT	PORTD
#define DEBUG_DDR	DDRD

#include "Core.h"

// prototype
int main(void) __attribute__ ((OS_main)) __attribute__ ((section (".init9")));

// implementation
int main(void) {
	asm volatile ("clr __zero_reg__");
	// save the status register for the reset cause
	_save_MCUSR = MCUSR;
	// reset status register
	MCUSR = 0;
	// enable watchdog	
	watchdogConfig(WDT_TIMEOUT);
	#ifdef DEBUG
		DEBUG_DDR = 0xFF;
		DEBUG_PORT = DEBUG_INIT;
	#endif
	// signal startup
	blinkLed();
	// STK500_bootloader runs only if reset reason was EXTERNAL RESET/POWER ON
	if (_save_MCUSR & _BV(EXTRF) ) {
		STK500Bootloader();
	}
	MySensorsBootloader();
}