Updated README.md

* added PCB fab info
* added troubleshoting item - arduino resets
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@ -50,7 +50,7 @@ Setup:
* Check the chip identification by runnig the following command:
<pre>
./afterburner i
./afterburner i -t [GAL_type]
</pre>
If you get some meaningfull GAL chip identification like:
@ -114,6 +114,42 @@ How aferburner works:
http://www.armory.com/%7Erstevew/Public/Pgmrs/GAL/_ClikMe1st.htm
PCB:
---------------
If you decide to use a PCB rather than making breadboard or protoboard
build, then you have several options.
- Etch your own PCB.
* The etching design is stored in 'pcb' directory, use
afterburner_etch_1200dpi_bot.png file to transfer the design to the
copper board.
* It's a single sided design, but you'll have to patch 3
traces. See the the silk screen image, 2 short patch wires are indicated
in the top left corner, the last one slightly longer is in located
between hole C1+ and hole VIN+. Do not connect these 2 holes, just look
for the horizontal line indicated on the silkscreen.
* Resistors are not through hole but smt 1206 package to reduce drilling.
* The copper is on the bottom side, to make it easy to solder the socket
and capacitors. However, that makes it a bit complicated to solder the Arduino
pins. What needs to be done is to push the pins from the top part of the board
(side without copper) so that the metal bits are flush with the plastic which keeps
the pins together (plastic on the top), then solder the pins on the bottom side. You
may then take off the plastic from the top side and slide it in from the bottom side.
- Order it online on jlcpcb.com, pcbway.com, allpcb.com etc. Use one of the zip archive
stored in the gerbers directory and upload it to the manufacturesr's site of your choice.
Use fab_1_1.zip for smaller PCB design that allows to program 16V8 devices only.
Use fab_2_0.zip for a bigger design that allows to program 16V8 and 22V10 devices.
The price difference should be minimal as both designs fit within 100x100 mm area.
* Dimensions of the fab_1_1 board is 55x53 mm
* Dimensions of the fab_2_0 board is 57*72 mm
* 2 layer board
* PCB Thickness: 1.6, or 1.2
* Copper Weight: 1
* The rest of the options can stay default or choose whatever you fancy (colors, finish etc.)
Troubleshooting:
----------------
- it does not work!
@ -137,6 +173,17 @@ Troubleshooting:
just via serial USB cable may not be sufficient for driving the GAL chip and the
voltage up-converter
- I've set the VPP voltage to 14 V, put the chip into the Ziff socket, turned on
the power switch then run Afterburner with the 'i' command. My Arduino made a tiny
short buzzing noise and then reset itself. What went wrong ?
* most likely the VPP is set too high and the IC does not like that, it pulls the VPP
pin down several times causing the Arduino to reset on brown out. Solution: reduce the
VPP voltage by turning the pot clockwise on the MT3608 module.
* this happens for example on ATF devices when VPP is set to 12V. ATF should use VPP
set to 10V when programmed by Afterburner.
- afterburner reports it can not connect to /dev/ttyUSB0, permission denied