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# Modifications to PowerWASP firmware with a few extras
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The later versions of the PowerWASP controller board have power loss detection on pin 65 (low on loss). this has been configured in POWER_LOSS_RECOVERY. Because of this there is no need to save each command line just in case of a power loss to the machine. The board will hold enough power to allow the print to be saved to the SD card.
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The retract position on finishing the print has been set at Z190 X0 Y0
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There are provisions made here to use ESP3D wireless printer control.
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https://github.com/luc-github/ESP3D
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The original PowerWASP board has available a internal serial port connection with Arduino Serial3.
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The connections are as follows:
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```
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.------------.---------------------.
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| | Serial3 |
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| | [O] 5V | Front
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| FAN | [O] GND | panel
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| | [O] TX | side
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| | [O] RX |
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`------------´---------------------´
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```
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With the option of wireless file upload to the SD card, the idea of updating the Firmware
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from the SD can also be useful. This option has been selected, but requires a modified boot loader
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that can be found here:
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https://github.com/rainerumrobotics/MicroBridge-Arduino-ATMega2560
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USB and SDCARD Firmware flashing for the ARDUINO ATMEGA 2560 and ADK
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---------------------------------------------------------------------
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The bootloader looks for byte in eeprom at address 0x3FF:
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-if it is set to 0xF0 bootloader will look for a bin file on the sdcard named
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firmware.bin and use it to flash the firmware then reset the byte to 0xFF so it
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does this only once
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-otherwise no action is taken and bootloader works as a arduino bootloader except
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some of the debugging functions are missing
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Setup
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ADAFruit micro sdcard 5V ready:
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SDCARD on ATMEGA 2560 or ADK
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pin 50 - DO
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pin 51 - DI
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pin 52 - CLK
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pin 53 - CS
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Generate BIN file for firmware update:
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To generate a bin file you need issue the following command on you apps elf executable:
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avr-objcopy -I elf32-avr -O binary firmware.cpp.elf firmware.bin
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this generates firmware.bin which can be put on the sd for flashing your firmware. You can find the elf
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file in you apps build directory.
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Using olimex usb to upload bootloader:
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avrdude -c stk500v2 -p m2560 -P /dev/tty.usbmodemfd131 -B 500 -e -u -U lock:w:0x3F:m -U efuse:w:0xFD:m -U hfuse:w:0xD8:m -U efuse:w:0xFF:m -F
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avrdude -p m2560 -c stk500v2 -P /dev/tty.usbmodemfa131 -F -U flash:w:stk500boot.hex -b 115200 -B1 -U lock:w:0x0F:m
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avrdude -p m168 -c usbtiny -e -u -U lock:w:0x3f:m -U efuse:w:0x00:m -U hfuse:w:0xDD:m -U lfuse:w:0xFF:m
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avrdude -p m2560 -c stk500v2 -P /dev/tty.usbmodemfd131 -U flash:w:stk500boot_v2_mega2560.hex -U lock:w:0x0F:m -v
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avrdude -c stk500v2 -p m2560 -P /dev/tty.usbmodemfd131 -U lock:w:0x3F:m -U efuse:w:0xFD:m -U hfuse:w:0xD8:m -U lfuse:w:0xFF:m -e -v
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