Adding I2C functionality to the FX2 device. (Tested with a 24C256 EEPROM) #22
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…t consists of a soft i2c core along with a shift register and an examples directory to show its usage.
RacingTornado
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| I2C BLOCK BITBANG | ||
| *********************************/ | ||
| //Called with number of retries | ||
| i2c_init(3); |
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This needs a huge amount of work.
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This commit adds I2C functionality to the eeprom. The same steps are applicable to this pull request to make and build use the following steps:
To run this first clone the repository, then cd to the fx2lib directory and checkout this particular branch.
After this run 2 commands:
git submodule initgit submodule updatemakeAfter this , navigate to the examples/i2c_bitbang directory and execute the following commands:
makeNow push the FX2 device inside the USB port(remove any udev rules you may have set up for Cypresse's VID and PID) and run
make fx2_downloadAfter this open minicom
sudo minicom -H -w name_of_configurationYou should see the data which is read from the EEPROM displayed on your console. Make sure the UART0 pins are connected to the appropriate GPIO's on the FX2.
A couple of things to take care are that the I2C is in non-blocking mode. So often the same data is printed(that is previous data) if new data has not arrived. By using a logic analyzer the I2C can be confirmed to work. Otherwise we would need to busy wait in the loop which removes any benefit we may get from using queues.