Difference between revisions of "ARDUINO MEGA Update Bootloader"
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== Arduino 2560 Bootloader Issue == | == 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 current bootloader burned onto the Arduino MEGA 2560/ADK is not compatible with ROBOTC. In its current form, you will be able to download the ROBOTC Firmware to the Arduino MEGA 2560/ADK, 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 | + | The reason for this is because there is a bug in the Arduino MEGA 2560/ADK firmware that does not allow flash write commands to start at anywhere but the beginning of flash memory (0x000000). See the bottom of this page for more technical details. |
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| + | Because ROBOTC is not able to burn a new bootloader as of today, you will need to use the Arduino's Open Source language with our a modified bootloader file to re-burn your bootloader on your Arduino MEGA 2560/ADK boards. Once the new bootloader is burned, you will be able to program your Arduino MEGA 2560/ADK with both ROBOTC and the Arduino Open Source language. | ||
== Equipment Needed == | == Equipment Needed == | ||
Revision as of 15:45, 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 MEGA 2560/ADK is not compatible with ROBOTC. In its current form, you will be able to download the ROBOTC Firmware to the Arduino MEGA 2560/ADK, but you will not able to download any user programs.
The reason for this is because there is a bug in the Arduino MEGA 2560/ADK firmware that does not allow flash write commands to start at anywhere but the beginning of flash memory (0x000000). See the bottom of this page for more technical details.
Because ROBOTC is not able to burn a new bootloader as of today, you will need to use the Arduino's Open Source language with our a modified bootloader file to re-burn your bootloader on your Arduino MEGA 2560/ADK boards. Once the new bootloader is burned, you will be able to program your Arduino MEGA 2560/ADK with both ROBOTC and the Arduino Open Source language.
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
Technical Details
ROBOTC's Fix:
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 }
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 ) { eraseAddress = address & 0xFFFFFF00; // ROBOTC Custom Bootloader Addition // 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 }
