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Home / PeggyVideo16
Name Modified Size Downloads / Week Status
Parent folder
PeggyVideo16.zip 2014-02-03 8.1 kB 0
main.c 2014-02-01 14.1 kB 0
PeggyVideo16.h 2014-01-12 5.5 kB 0
README.txt 2014-01-12 4.4 kB 0
Totals: 4 Items   32.1 kB
This archive contains the source code, make files, etc for "video-peggy-twi" Copyright 2008 by Jay Clegg. All rights reserved. Released under GPL license. ////////////////////////////////////////////////////////////////////////////// I am releasing this code and the information for how it works 'as-is' and make *NO* guarantees that it will not cause damage to your peggy2, your Arduino, your computer, your immediate surroundings, your health, or your sanity. ////////////////////////////////////////////////////////////////////////////// More information about this project, here http://www.planetclegg.com/projects/Twi2Peggy.html In brief: The C firmware code is intended to be installed on an unmodified Peggy 2.0. It sets the Peggy up as a TWI/I2C slave device, and requires a TWI Master to drive the display. Makefile is included. You will need avr-gcc toolchain (WinAVR or AvrMacPack toolchains work well) to build this project, and you will need a AVR programmer that is compatible with AVRDUDE and that supports a 6-pin ISP header to load the code. If you don't have a programmer but have a FTDI cable, you can use that assuming that the AVR has the Arduino bootloader installed. (See the section at the bottom of this file if you want to try to get the firmware working using the Arduino IDE and FTDI cable rather than AVR-GCC.) You should modify the makefile to match the AVR programmer you intend to use. The values are well marked at the top of the makefile. You should then be able to do a 'make' followed by a 'make install' to load the code on the chip. Also included: Two Arduino sketches (.pde files) one that just sends an animated test pattern from the Arduino to the peggy, and another that translates Serial to TWI (so that you can drive the display from a PC). Also included: A python script that will send a test pattern to a serial port, so that you can see if everything is working. You'll need PySerial installed, and you'll need to modify the script to match whatever serial port you are using. You would use this to send the output to the Arduino which then forwards the data to the Peggy. Edit the script and set the serial port filename before using it. README.txt Er, this file. COPYING.txt License. Read it! Makefile Make file for Peggy code main.c Peggy code video-peggy-twi.bak.hex Compiled Peggy code Serial2TwiPeggy.pde Arduino code to convert serial from PC to TWI TwiSendTestPattern.pde Arduino code to send a test pattern peggytest.py Python code to send a test pattern, use with Arduino and Serial2TwiPeggy.pde === Building the Video Peggy firmware with Arduino IDE rather than AVR-GCC: === If you don't have an AVR toolchain but have the Arduino IDE, you *may* be able to get the source code to run as an Arduino sketch and uploadit with a FTDI cable by making some minor modifications. I've deliberately not included a ported version of the Video Peggy firmware so as not to cause confusion about what code gets installed on the Peggy versus what code gets installed on the Arduino. But the steps needed to do a port are as follows: 1) copy main.c code into the Arduino IDE as a new sketch 2) comment out the #include<> statements at the top of the file 3) change the signature for "int main(void)" to "void setup()" 4) create an empty "void loop() {}" method to keep the compiler happy... 5) make sure the FPS variable in the source is 90 or possibly less. 6) Use the FTDI cable to upload the compiled code to the Peggy. 7) Try not to get the resulting PDE mixed up with those that are intended for the Arduino. Two I2C masters == potential anti-goodness. I prefer the avr-gcc approach, as this generates more optimal code by default. But I understand that some Peggy users may lack a full toolchain, so I've included these instructions to help, athough I have not thoroughly tested an Arduino IDE based build of the firmware. ////////////////////////////////////////////////////////////////////////// This code is derived from above. Interrupt and main loop swapped around, to make the slave I2C run off the interrupt, and the video display run as main task. Of course, all run within freeRTOS.
Source: README.txt, updated 2014-01-12

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