stm32f4: Document which discovery board the examples are for
Try and reduce a little confusion if we can.
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examples/stm32/f4/stm32f4-discovery/README
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examples/stm32/f4/stm32f4-discovery/README
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This directory contains examples for the _original_ stm32f4 discovery.
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The PCB should be labelled either MB997A or MB997B, and contains a user USB
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port, and an audio dac on board, along with a MEMs microphone and an
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accelerometer.
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http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/PF252419
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The later stm32f4 discovery boards, for the f401, MB91115B and for the f429i,
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MB1075B will not work as is with these demos, but they should only need minor
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tweaking for pin configurations.
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