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docs: Update stm32f1.md document 

Several restrictions documented in the stm32f1.md no longer apply.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-08-05 11:38:48 -04:00
parent 3d0f7188df
commit 30bd7c0e47
1 changed files with 8 additions and 11 deletions
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19
docs/stm32f1.md
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@ -7,10 +7,9 @@ pin mappings either.
General considerations
======================
The STM32 port currently requires an 8 MHz crystal for correct
operation. The port is currently designed for and tested with
STM32F103xB series MCUs, but it should work with any STM32F103 series
MCUs with minimal changes.
The port is currently designed for and tested with STM32F103xB series
MCUs, but it should work with any STM32F103 series MCUs with minimal
changes.
Unlike Arduino-based boards, typically there is no automatic reset on serial
connection with STM32 boards. Please use `restart_method: command` with the
@ -19,14 +18,12 @@ STM32F1 port.
Fixed pins
==========
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.
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.
SPI uses pins PB13/PB14/PB15, but the pins can be used as general I/O
if SPI is not used.
Digital I/O
===========