BeagleBone for Secret Agents by Josh Datko

Author:Josh Datko [Datko, Josh]
Language: eng
Format: epub
Publisher: Packt Publishing
Published: 2014-09-22T21:00:00+00:00

In the FPS_CryptoCape.ino file, this is accomplished by setting digital output 2 as an output and then pulling the line low. When a fingerprint is recognized, the pin is configured as an input, which prevents the ATmega from pulling the line either high or low and allows normal I2C operation.

Add a jumper wire from D2 on the ATmega breakout pads to the SCL pad near the TPM on the CryptoCape. This is that one extra wire that will allow the ATmega to lock out the BBB's access to the I2C bus. Once you add that wire, upload the FPS_CryptoCape.cpp.hex, which you can either compile yourself or use the pre-compiled version. The wires on your CryptoCape should look like the following image:

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