FLASH.md instructions

Author: eigen-value

FLASH.md

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+# Flashing firmware on STM32 via UART
+
+### How to
+
+The steps to follow in order to flash a new firmware (.bin) file on STM32 are the following:
+
+_Hardware_
+* Connect STM32 _Boot0_ pin to VDD 3V3 or connect _Boot0_ to _D2_ pin (nano)
+* Press _Reset_ button on Nucleo board or connect STM32 Reset pin to _D3_ (nano)
+* Connect nano _TX_ pin to STM32 _D2_ (UART1 RX) pin
+* Connect nano _RX_ pin to STM32 _D8_ (UART1 TX) pin
+* Connect nano _GND_ to STM32 _GND_
+
+_Software_
+* Use `STM32_startCommunication` to connect to STM32
+* Perform a memory erase (eg. mass extended erase `STM32_eraseMEM(0xFFFF)`)
+* Write your .bin file: `STM32_writeMEM("Blink_fast.bin")`
+
+If _Boot0_ is wired to 3V3, disconnect it and press STM32 _Reset_ pin
+
+### Tested on
+
+* STM32-F401RE