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Visite the WeeW STM32F1 tutorial, were you will learn about the micro-controller and create the code from scratch:
• STM32F1 Tutorial
This video provide an quick review about how to unlock KEIL simulation debugging mode for the STM32F1, NXP and TI ARM yP based microcontroller
The link for the page related to the content: http://www.keil.com/support/docs/3726...
Link for the blue pill board (STM32F107C8):
https://www.amazon.com/Aideepen-STM32...
Enjoy and have fun !!