I am in need of help for developing a board description for the Core407V, with a stm32f407vet6 chip.

  https://www.waveshare.com/wiki/Core407V

This board seems similar to the existing olimex_stm32_e407, with the following immediate differences:

The Core407V has 

• two LEDs on PA6 and PA7,
  
• two user push buttons on PE4 (k0) and PE3 (k1)
• There is also a wakeup button k_up on PA0, which I didn't compare.

I have edited my own board.h file, but having difficulty with the cmake stuff:

I tried to clone a core407v_stm32f407 board from the olimex_stm32_e407, but running into problems. The first of which is this:

$ mkdir build && cd build

$ cmake ..

-- Found PythonInterp: /usr/bin/python3 (found suitable version "3.5.3", minimum required is "3.4") 

-- Selected BOARD core407v_stm32f407

Zephyr version: 1.11.99

Parsing Kconfig tree in /home/wwg/zephyr/Kconfig

Using /home/wwg/zephyr/boards/arm/core407v_stm32f407/core407v_stm32f407_defconfig as base

Merging /home/wwg/zsrc/blinky/prj.conf

warning: BOARD_CORE407V_STM32F407 (defined at /home/wwg/zephyr/boards/arm/core407v_stm32f407/Kconfig.board:7) was assigned the value "y" but got the value "n" -- check dependencies

warning: CLOCK_STM32_PLL_N_MULTIPLIER (defined at /home/wwg/zephyr/drivers/clock_control/Kconfig.stm32:217, /home/wwg/zephyr/drivers/clock_control/Kconfig.stm32:282) was assigned the value "168" but got the value "336" -- check dependencies

warning: CLOCK_STM32_PLL_N_MULTIPLIER (defined at /home/wwg/zephyr/drivers/clock_control/Kconfig.stm32:217, /home/wwg/zephyr/drivers/clock_control/Kconfig.stm32:282) was assigned the value "168" but got the value "336" -- check dependencies

/home/wwg/zephyr/boards/arm/core407v_stm32f407/core407v_stm32f407_defconfig:4: warning: attempt to assign the value "y" to the undefined symbol SOC_STM32F407XX

/home/wwg/zsrc/blinky/prj.conf:2: warning: CONSOLE (defined at /home/wwg/zephyr/drivers/console/Kconfig:10) set more than once. Old value: "y", new value: "y".

/home/wwg/zsrc/blinky/prj.conf:6: warning: UART_CONSOLE (defined at /home/wwg/zephyr/drivers/console/Kconfig:40) set more than once. Old value: "y", new value: "y".

/home/wwg/zsrc/blinky/prj.conf:7: warning: SERIAL (defined at /home/wwg/zephyr/drivers/serial/Kconfig:9) set more than once. Old value: "y", new value: "y".

warning: user value 168 on the int symbol CLOCK_STM32_PLL_N_MULTIPLIER (defined at /home/wwg/zephyr/drivers/clock_control/Kconfig.stm32:217, /home/wwg/zephyr/drivers/clock_control/Kconfig.stm32:282) ignored due to being outside the active range ([192, 432]) -- falling back on defaults

-- Generating zephyr/include/generated/generated_dts_board.h

Error: core407v_stm32f407.dts.pre.tmp:257.21-22 syntax error

FATAL ERROR: Unable to parse input tree

CMake Error at /home/wwg/zephyr/cmake/dts.cmake:83 (message):

  command failed with return code: 1

Call Stack (most recent call first):

  /home/wwg/zephyr/cmake/app/boilerplate.cmake:260 (include)

  CMakeLists.txt:3 (include)

-- Configuring incomplete, errors occurred!

The intended clock is 168 MHz, with 8 MHz HSE crystal. The top of the _defconfig file is:

CONFIG_ARM=y

CONFIG_BOARD_CORE407V_STM32F407=y

CONFIG_SOC_SERIES_STM32F4X=y

CONFIG_SOC_STM32F407XX=y

# 168MHz system clock

CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=168000000

CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000

# Enable MPU

CONFIG_STM32_ARM_MPU_ENABLE=y

CONFIG_SERIAL=y

# console

CONFIG_CONSOLE=y

CONFIG_UART_CONSOLE=y

# enable pinmux

CONFIG_PINMUX=y

# enable GPIO

CONFIG_GPIO=y

# clock configuration

CONFIG_CLOCK_CONTROL=y

# Clock configuration for Cube Clock control driver

CONFIG_CLOCK_STM32_HSE_CLOCK=8000000

CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL=y

# use HSE as PLL input

CONFIG_CLOCK_STM32_PLL_SRC_HSE=y

# produce 168MHz clock at PLL output

CONFIG_CLOCK_STM32_PLL_M_DIVISOR=6

CONFIG_CLOCK_STM32_PLL_N_MULTIPLIER=168

CONFIG_CLOCK_STM32_PLL_P_DIVISOR=2

CONFIG_CLOCK_STM32_PLL_Q_DIVISOR=7

CONFIG_CLOCK_STM32_AHB_PRESCALER=1

CONFIG_CLOCK_STM32_APB1_PRESCALER=4

CONFIG_CLOCK_STM32_APB2_PRESCALER=2

I used the existing value for the MULTIPLIER. Hints for correcting these errors would be appreciated.

Warren