-----Original Message-----
From: Maciek Borzecki [mailto:maciek.borzecki(a)gmail.com]
Sent: Friday, February 26, 2016 8:07 AM
To: devel(a)lists.zephyrproject.org; users(a)lists.zephyrproject.org
Subject: [devel] STM32F103x port

Hi list,

I've done a PoC port of Zephyr to STM32F103VE MCU on a EB-STM_06 dev
board. The port is rather minimal, most of the configuration is hardcoded.
The MCU is configured to use internal HSI clock source, with PLL feeding a
36MHz clock to SYSCLK and AHB/APB (tried to make it board agnostic). The
minimal UART driver assumes that USART1 will be used with a fixed speed of
9600kbps. The the best of my knowledge, this should be enough as a starting
point for porting to other boards.

Looks like you beat me to some of it. I have been slowly working on an STM32F2xx support. If you clean up your patches and submit to gerrit, much of the STM32F2xx patches can be easily integrated.

The source code lives here:
https://github.com/bboozzoo/zephyr/tree/bboozzoo/stm32f103 in
bboozzoo/stm32f103 branch.

Obligatory video: https://goo.gl/photos/AGhfXYvv8CswjRRu7 (sorry for the
background sound and overall potato quality). In the vide I flash the firmware
through STLink, the board resets and starts the hello world sample. The
output is received via a USB RS232 adapter. The sample program has been
also modified to print an increasing loop counter, just to make sure we're not
looping the same content.

If anyone feels like this is worth working on I might be able to try and clean it
up a little bit and push out to Gerrit (once I get my access issues resolved). I
also have a couple of boards with STM32F3xx and STM32L4xx MCUs so I
might give these a try, unfortunately all of these are Cortex-M4 based.

Has anyone looked at ports to Cortex-M0?

Cheers,
--
Maciek Borzecki