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Wei-Han Chen 9a7e82bac8 stm32: make half-duplex SPI works on STM32F0 
According to RM0091, steps for using DMA for SPI peripheral should be:

1. enable DMA RX / TX
2. enable SPI
3. wait for DMA to complete
4. disable DMA RX / TX
5. disable SPI

BUG=b:70482333
TEST=tested on reworked staff (half-duplex)
TEST=tested elm (full-duplex)

Change-Id: I095409195cd1e0379995f0bfa6605c2e1a0dfd3c
Reviewed-on: https://chromium-review.googlesource.com/853715
Commit-Ready: Wei-Han Chen <stimim@chromium.org>
Tested-by: Wei-Han Chen <stimim@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
2018-01-25 00:15:48 -08:00
board
Nami: trigger type of LCD backlight
2018-01-24 20:24:39 -08:00
builtin
Add uint_(least|fast)*_t types
2017-08-07 19:29:13 -07:00
chip
stm32: make half-duplex SPI works on STM32F0
2018-01-25 00:15:48 -08:00
common
fpsensor: update interface
2018-01-23 05:25:08 -08:00
core
cr50: fix annoying LD warnings
2018-01-05 14:28:47 -08:00
cts
eCTS: Run openocd and lsusb as a root
2017-07-08 20:38:53 -07:00
docs
g: rename usb_updater into gsctool
2017-10-10 22:13:43 -07:00
driver
bd9995x: Clear VSYS_PRIORITY when Vbat > Vbat_min
2018-01-22 22:07:17 -08:00
extra
gsctool: add options to control ccd
2018-01-12 03:27:10 -08:00
include
fpsensor: update interface
2018-01-23 05:25:08 -08:00
power
scarlet: Assert SYS_RST_L in S5
2018-01-23 20:18:28 -08:00
test
buttons: Make buttons[] common.
2017-11-17 20:18:38 -08:00
util
Nami: Add Nami to flash_ec script
2018-01-23 17:41:53 -08:00
.checkpatch.conf
checkpatch: prevent stupid complaints about description title
2016-07-21 13:13:27 -07:00
.gitignore
Makefile.rules: Add targets to see file size differences
2016-11-15 17:43:21 -08:00
COMMIT-QUEUE.ini
Add fizz-no-vmtest-pre-cq to the pre-cq set
2017-06-21 20:05:02 +00:00
LICENSE
Add LICENSE file to project
2012-05-11 09:11:52 -07:00
Makefile
Makefile: Generate hashes for the touchpad FW
2017-09-15 03:08:26 -07:00
Makefile.rules
ectool: add servo v2 spi support
2018-01-17 06:20:37 -08:00
Makefile.toolchain
ec_chip_mchp: Add MCHP chip folder
2017-12-28 12:35:07 -08:00
OWNERS
Add OWNERS files
2014-04-02 19:58:53 +00:00
PRESUBMIT.cfg
ec:Add presubmit hook to enforce host command definitions
2017-02-25 02:08:37 -08:00
README
README: Add link to quick-build instructions
2015-12-07 13:49:35 -08:00
README.fmap
Update EC config and FMAP to reserve room for vboot signatures
2012-05-04 14:42:58 -07:00
setup.py
servo: add usb_console to chroot
2017-11-16 21:07:40 -08:00

README 

For an overview of the Embedded Controller firmware, refer to

http://www.chromium.org/chromium-os/2014-firmware-summit

For instructions on building from source, refer to

http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly
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