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stm32f1: add SPI support

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Add basic SPI support and associated documentation.

v2: remove baud rate check, fix baud rate calculations
v3: finish transaction with BSY check, disable SPI when not in use

Signed-off-by: Grigori Goronzy <greg@chown.ath.cx>
This commit is contained in:
Grigori Goronzy
2018-07-02 23:17:28 +02:00
committed by KevinOConnor
parent b0ee323e2e
commit 5c7c8c984b
5 changed files with 122 additions and 2 deletions
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6
docs/stm32f1.md
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@@ -22,7 +22,8 @@ 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.
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
===========
@@ -44,4 +45,5 @@ PC0-PC5).
SPI
===
SPI support is currently unimplemented.
SPI uses pin PB13 (SCK), PB14 (MISO) and PB15 (MOSI). The clock speed range is
0.15..18 MHz. Chip select pins do not have any restrictions.