Testing the updated kernel
Once you have programmed B_L475E_IOT01A, flip the switch back to normal boot and then press the reset button on the development board. You should see the familiar pyb drive mount on the filesystem and have access to the MicroPython REPL. In order to test that our libraries are included and everything is working as expected, we are going to do two things. First, we are going to wire in the RobotDyn I/O expander and the RGB pushbutton so that we can run our application from Chapter 3, Writing a MicroPython Driver for an I/O Expander, on our new kernel and board. Second, we are going to use a logic analyzer to look at the initialized pins to make sure that they are behaving the way we set them to.
The schematic diagram ...
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