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stm32f1: Initial support for serial over USB

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2018-10-03 22:40:01 -04:00
parent 1302514ea8
commit bc5e961d73
4 changed files with 294 additions and 5 deletions
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docs/stm32f1.md
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@ -20,10 +20,14 @@ STM32F1 port.
Fixed pins
==========
The UART used for communication with the host is fixed to pins PA9 (TX) and PA10
(RX). SWD pins (PA13/PA14) are enabled for debugging and cannot be used for any
I/O. SPI uses pins PB13/PB14/PB15, but the pins can be used as general I/O if
SPI is not used.
When using serial, the UART used for communication with the host is
fixed to pins PA9 (TX) and PA10 (RX). When using USB, the PA11 (D-)
and PA12 (D+) pins are reserved. The USB code assumes that PA12 (D+)
has a fixed pullup resistor attached to it.
SWD pins (PA13/PA14) are enabled for debugging and cannot be used for
any I/O. SPI uses pins PB13/PB14/PB15, but the pins can be used as
general I/O if SPI is not used.
Digital I/O
===========