Difference between revisions of "ARDUINO MEGA Update Bootloader"
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case CMD_LOAD_ADDRESS: | case CMD_LOAD_ADDRESS: | ||
#if defined(RAMPZ) | #if defined(RAMPZ) | ||
− | address = (((address_t)(msgBuffer[1])<<24)|((address_t)(msgBuffer[2])<<16)|((address_t)(msgBuffer[3])<<8)|msgBuffer[4]))<<1; | + | address = (((address_t)(msgBuffer[1])<<24)|((address_t)(msgBuffer[2])<<16)| |
+ | ((address_t)(msgBuffer[3])<<8)|msgBuffer[4]))<<1; | ||
#else | #else | ||
address = (((msgBuffer[3])<<8)|(msgBuffer[4]))<<1; //convert word to byte address | address = (((msgBuffer[3])<<8)|(msgBuffer[4]))<<1; //convert word to byte address | ||
Line 29: | Line 30: | ||
if ( msgBuffer[0] == CMD_PROGRAM_FLASH_ISP ) | if ( msgBuffer[0] == CMD_PROGRAM_FLASH_ISP ) | ||
{ | { | ||
− | |||
− | |||
// erase only main section (bootloader protection) | // erase only main section (bootloader protection) | ||
if (eraseAddress < APP_END ) | if (eraseAddress < APP_END ) |
Revision as of 15:40, 11 May 2012
Note: This document only applies to the MEGA 2560 and MEGA ADK Arduino Boards. All other Arduino boards bootloaders are good!
Arduino 2560 Bootloader Issue
The current bootloader burned onto the Arduino 2560 is not compatible with ROBOTC. In its current form, you will be able to download the ROBOTC Firmware to the Arduino, but you will not able to download any user programs.
The reason for this is because there is a bug in the Arduino 2560 firmware that does not allow flash-write commands to begin anywhere other than address 0x00000.
case CMD_LOAD_ADDRESS: #if defined(RAMPZ) address = (((address_t)(msgBuffer[1])<<24)|((address_t)(msgBuffer[2])<<16)| ((address_t)(msgBuffer[3])<<8)|msgBuffer[4]))<<1; #else address = (((msgBuffer[3])<<8)|(msgBuffer[4]))<<1; //convert word to byte address #endif msgLength = 2; msgBuffer[1] = STATUS_CMD_OK; break; case CMD_PROGRAM_FLASH_ISP: case CMD_PROGRAM_EEPROM_ISP: { unsigned int size = ((msgBuffer[1])<<8) | msgBuffer[2]; unsigned char *p = msgBuffer+10; unsigned int data; unsigned char highByte, lowByte; address_t tempaddress = address; if ( msgBuffer[0] == CMD_PROGRAM_FLASH_ISP ) { // erase only main section (bootloader protection) if (eraseAddress < APP_END ) { boot_page_erase(eraseAddress); // Perform page erase boot_spm_busy_wait(); // Wait until the memory is erased. eraseAddress += SPM_PAGESIZE; // point to next page to be erase }
Equipment Needed
To burn the bootloader, you'll need to buy an AVR-ISP (in-system programmer), USBtinyISP or build a ParallelProgrammer. The programmer should be connected to the ICSP pins (the 2 by 3 pin header) - make sure you plug it in the right way. The board must be powered by an external power supply or the USB port.
Software Needed
ROBOTC is not currently able to burn a bootloader onto an Arduino board, so you'll need to download a copy of the latest versio