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If you want to develop driver based on STM32Cube HAL, you could check
serial or pwm drivers as example.
You can also find other examples of using HAL in Cube SDK that you could
download from st website:
For instance, for STM32F4 family: http://www.st.com/en/embedded-software/stm32cubef4.html
("get software" at
the very bottom of the page)
You'll find a Examples sections in the provided code.
If you need specific support on using the HAL, you'll find support in ST
community website: https://community.st.com/
Finally, use of hal should not be a blocker, you could implement native
driver if you feel more comfortable.
On 16 January 2017 at 17:33, jack ma <assangema(a)gmail.com> wrote:
if someone can write some document for how to use hal drivers(eg,stm32
cube) to write drivers or give an example for that ?
I really want use Zephyr for new project, but not familiar with the
driver develop. after browse the code tree, I did not find a method, so
2017-01-16 17:42 GMT+08:00 Erwan Gouriou <erwan.gouriou(a)linaro.org>:
You should indeed first look at Zephyr documentation, and particularly
Then, regarding STM32 driver/IP, there are several sources that could
help you to develop I2C driver for STM32F4xx family
(as your driver should benefit to other SoCs from the F4 family):
-Zephyr native implementation of stm32lx i2c driver:
-HAL implementation from STM32Cube SDK (that you could get here
Inside SDK, you'll find i2c code examples using HAL
-stm32f411re Refence Manual for information about stm32f411re I2C (
Then, you have two options:
-based on STM32Cube HAL, develop a generic STM32 driver that will benefit
to all STM32 based boards.
-develop a Zephyr "native" STM32F4 I2C API that will benefit to STM32F4
family devices (similar to stm32lx.c driver)
Either ways, note that you could use STM32Cube SDK
(ext/hal/st/stm32cube/stm32f4xx/soc/stm32f411xe.h) to benefit from
useful structures, macros and defines that provide abstraction capability
so you don't have to deal with subtle differences between
similar SoCs (such as stm32f401re and stm32f411re).
Good luck with your project
On 14 January 2017 at 23:26, Piotr Król <piotr.krol(a)3mdeb.com> wrote:
On Mon, Jan 02, 2017 at 03:03:58PM +0100, Erwan Gouriou wrote:
Hi Piotr,Hi Erwan,
This helps sample code works correctly. With that I can continue with my
There was an issue on F411RE clock initialisation steps.
I've submitted following change to correct it:
Hope it helps.
target project, which is i2c driver for F411RE.
Can you point me to information how I should approach adding i2c driver
for this board ?
I assume first I should familiarize myself with Zephyr documentation and
contribution guidelines, but have you got any reference code for i2c
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