Adapting nRF24L01p sample to Bluepill

Dependencies:   mbed-STM32F103C8T6 mbed nRF24L01P

Fork of nRF24L01P_Hello_World by Owen Edwards

Still under tests

Used for frameworks evaluations : https://hackaday.io/project/21045-stm32-bluepill-frameworks-evaluation

Target HW : https://hackaday.io/project/21396-stm32-blue-pill-iot-expansion-boards

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