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MEGA instructions and crucial VIO comment added

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1 parent e319ceb commit 9592139bed5d181bc48a27bb432b652f3b7beec7 @cr committed Feb 3, 2012
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  1. +3 −3 README.md
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@@ -18,9 +18,9 @@ You'll need Python on your desktop, as well as the Python library pyserial (try
1. Open the example JTAGWhisperer sketch. Upload it to your Arduino.
-1. Get a Xilinx XC9572XL CPLD. Hook up your CPLD's JTAG pins to the Arduino: pins 8, 9, 10, 11 to TMS, TDI, TDO, and TCK, respectively. (If you have TCK on pin 11, you probably did it right.)
+1. Get a Xilinx XC9572XL CPLD. Hook up your CPLD's JTAG pins to the Arduino: pins 8, 9, 10, 11 to TMS, TDI, TDO, and TCK, respectively. (If you have TCK on pin 11, you probably did it right.) On an Arduino MEGA or MEGA2560, use pins 53, 52, 51, 50 accordingly.
-1. Apply power to the CPLD (note that it's a 3.3-volt device!). Try asking it its device ID as follows, from the root of the source directory:
+1. Apply power to the CPLD (note that it's a 3.3-volt device!). Do not forget so set VIO to 3.3V. Try asking it its device ID as follows, from the root of the source directory:
`./send_xsvf -p /dev/tty.your_arduino_serial_port xsvf/XC9572XL/DeviceID.xsvf`
@@ -43,4 +43,4 @@ By [Mike Tsao](http://www.sowbug.com/). Project on [GitHub](https://github.com/s
Many thanks to [Ben](https://github.com/ben0109/XSVF-Player/), who adapted the Xilinx XAPP058 code into something comprehensible. This code evolved from his project, and all the clever parts are his.
-The guys over at [Dangerous Prototypes](http://dangerousprototypes.com/) sell an XC9572XL breakout board. It's cheap, it's open-source hardware, and their Bus Pirate tool will also program CPLDs. The "AlternateLEDsOnButton" XSVF is taken directly from their CPLD tutorials. DP are the guys who got me into CPLDs in the first place. Check them out and buy their stuff!
+The guys over at [Dangerous Prototypes](http://dangerousprototypes.com/) sell an XC9572XL breakout board. It's cheap, it's open-source hardware, and their Bus Pirate tool will also program CPLDs. The "AlternateLEDsOnButton" XSVF is taken directly from their CPLD tutorials. DP are the guys who got me into CPLDs in the first place. Check them out and buy their stuff!

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