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--- projects:3dprinting:anycubic_i3_mega:replacing_atmega2560 [2020/03/12 10:01] – [Problems] admin
+++ projects:3dprinting:anycubic_i3_mega:replacing_atmega2560 [2022/02/04 12:40] (current) – [Install avrdude] admin
@@ Line 1: / Line 1: @@
 ====== Replace Atmega2560 at Trigorilla board ======
-You need to make sure that you can flash the arduino bootloader again onto the chip.
+If the Atmega2560 is broken, gives for example wrong temperature readings ((See for example here: [[https://forum.vellemanprojects.eu/t/replaced-atmega-2560-because-of-damaged-adc-input-t2-heatbed/10954]])), this is most likely caused by electrostatic discharge, destroying one or more input pins.
-For this you need an programmer like the AVR Dragon.
+With the right equipment, removing the Atmega2560 and soldeering a new one should be pretty straightforward. Once done, you need to make sure that the arduino bootloader is in place.
-This is the wiring connection for the AVR Dragon to the Trigorilla ISP connector:
+For this you need a programmer like the [[https://www.microchip.com/DevelopmentTools/ProductDetails/PartNO/ATAVRDRAGON|AVR Dragon]]. The connection typically would look like:
+^  Connecting trigorilla ISP to AVR Dragon ISP  ^
+|  {{:projects:3dprinting:anycubic_i3_mega:img_20200312_102818.jpg?400}}  |
+This is the wiring connection between an AVR Dragon and a Trigorilla ISP connector:
 ^   AVR Dragon ISP (pin)  ^  Trigorilla ISP connector (pin)  ^
 |  1: MISO  |  1: D50 (Mega2560 pin 22)  |
@@ Line 13: / Line 18: @@
 |  6: GND  |  6: GND  |
-To flash the bootloader, download and install avrdude:
+(Pin marking is given on the silk-screen)
+For flashing the bootloader, download and install avrdude:
 ==== Download avrdude ====
@@ Line 23: / Line 30: @@
 <code bash>
-gunzip -c avrdude-6.3.tar.gz | tar xf -
+# Dependencies
-cd avrdude-6.0
+sudo apt-get update
+sudo apt-get install build-essential bison flex automake libelf-dev libusb-1.0-0-dev libusb-dev libftdi-dev libftdi1
+mkdir -p $HOME/SOMEWHERE/apps/avrdude
+cd !$
+wget http://download.savannah.gnu.org/releases/avrdude/avrdude-6.4.tar.gz
+tar xzf avrdude-6.4.tar.gz
+# See here https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Word-Designators
+# for an explanation about word designaters in bash
+cd !$:r:r
 ./configure
 make
-su root -c 'make install'
+sudo make install
 </code>
@@ Line 49: / Line 65: @@
 Original bootloader:
-  arduino-1.8.5/hardware/arduino/avr/bootloaders/stk500v2/Mega2560-prod-firmware-2011-06-29.hex
+  ../arduino-1.8.5/hardware/arduino/avr/bootloaders/stk500v2/Mega2560-prod-firmware-2011-06-29.hex
 or the newer one that fixes the WDT and the !!! problems((See for more info: https://forum.arduino.cc/index.php?topic=168642.0)):
@@ Line 60: / Line 76: @@
 === 1. Unlock fuses, erase, verify ===
+The original command would be:
   avrdude -p m2560 -c dragon_isp -P usb -Ulock:w:0x3F:m -Uefuse:w:0xFD:m -Uhfuse:w:0xD8:m -Ulfuse:w:0xFF:m -e -v
+But this command will cause avrdude to show an error at the verification step((See here: [[http://www.engbedded.com/fusecalc]])). To prevent this error, it is recommended to change this command into:
-To prevent an error with the fuse setting at the verification step((See here: [[https://www.avrfreaks.net/forum/fuse-programming-error]])), change this command in:
   avrdude -p m2560 -c dragon_isp -P usb -Ulock:w:0xFF:m -Uefuse:w:0xFD:m -Uhfuse:w:0xD8:m -Ulfuse:w:0xFF:m -e -v
+The reason is that only the lowest 3 bits from the lockbits are used. The other bits don't return any sensible value and causes avrdude to indicate an error. Ideally you would need to use a logical AND to filter for the lowest 3 bits.
 === 2. Write the bootloader, set the lock fuse, verify ===
   avrdude -p m2560 -c dragon_isp -P usb -Uflash:w:stk500boot_v2_mega2560.hex:i -Ulock:w:0x0f:m -v
-Similarly, to prevent an error with the fuse setting at the verification step((See here: [[https://www.avrfreaks.net/forum/fuse-programming-error]])), change this command in:
+Similarly as in step 1, to prevent an error with the fuse setting at the verification step, change this command in:
   avrdude -p m2560 -c dragon_isp -P usb -Uflash:w:stk500boot_v2_mega2560.hex:i -Ulock:w:0xcf:m -v
@@ Line 89: / Line 108: @@
 </code>
-You may have to change the fuse setting verification step((See here: [[https://www.avrfreaks.net/forum/fuse-programming-error]])). See above for the change.
+You may have to change the fuse setting verification step((See here: [[http://www.engbedded.com/fusecalc]])). See above for the change.
 ===== Further information =====
   * [[https://learn.sparkfun.com/tutorials/installing-an-arduino-bootloader/all]]

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