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Update I2C with electronic setup authored by Emilio Corigliano's avatar Emilio Corigliano
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I2C.md
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......@@ -27,6 +27,8 @@ After the data transfer a STOP condition is sent (consisting in driving the SDA
![I2C-read-transaction](uploads/58ca8dbb8d13f8b9afe03ffcb893ad79/I2C-read-transaction.png)
# Electronic setup
In order to use properly the I2C bus a pull-up circuit should be implemented. The SCL and SDA GPIOs should be setted with the mode `ALTERNATE_OD` (alternate function with open-drain). This is because master and slaves should only be able to pull down the line and, when they release the line, the signal should be pulled up. If the `ALTERNATE_OD` mode is setted but no pull-up circuit is implemented the driver could hang forever. A lot of sensors implement on their own the pull-up circuit, so it could be enough; however, if no sensor is attached the hanging of the system could be caused anyway.
# _Deadlocks are a feature, not a bug!_
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