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BreathUp: AES, PCB, and debug

Hi!

During this end of the week, I worked on the AES and implement C and Python functions that encrypt and decrypt messages using AES128 CTR mode and they work pretty well.

I also worked on our PCB, and implemented some code to drive the LEDs with PWM.

We also discovered another problem: the quartzs are not oscillating, and as we need the 25MHz one for the USB, we still can’t use printf() to debug our drivers, witch makes thing a bit trickier. Therefore, while we are looking for a way to use the quartz, I worked on Segger Real Time Transfer (RTT) that should allow us to debug the code on the STM, but this is not working for the moment.

Eventually, during the beginning of the week I will work on RTT and on the quartzs.

Have a nice week,

Xavier Chapron

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