Project Slinky Using Olimex Board

This tutorial shows you how to create, build and run the Slinky application and communicate with newtmgr for an Olimex STM-E407 board.
###Prerequisites

  • Meet the prerequisites listed in Project Slinky.
  • Have a STM32-E407 development board from Olimex.
  • Have a ARM-USB-TINY-H connector with JTAG interface for debugging ARM microcontrollers (comes with the ribbon cable to hook up to the board)
  • Have a USB A-B type cable to connect the debugger to your computer.
  • Have a USB to TTL Serial Cable with female wiring harness.
  • Install the OpenOCD debugger.

Create a New Project

Create a new project if you do not have an existing one. You can skip this step and proceed to create the targets if you already have a project created or completed the Sim Slinky tutorial.

$ newt new slinky
Downloading project skeleton from apache/mynewt-blinky...
...
Installing skeleton in slink...
Project slink successfully created
$ cd slinky
$newt install
apache-mynewt-core

Create the Targets

Create two targets for the STM32-E407 board - one for the bootloader and one for the Slinky application.

Run the following newt target commands, from your project directory, to create a bootloader target. We name the target stm32_boot.

$ newt target create stm32_boot
$ newt target set stm32_boot bsp=@apache-mynewt-core/hw/bsp/olimex_stm32-e407_devboard
$ newt target set stm32_boot build_profile=optimized
$ newt target set stm32_boot target.app=@apache-mynewt-core/apps/boot

$ newt target create stm32_slinky
$ newt target set stm32_slinky bsp=@apache-mynewt-core/hw/bsp/olimex_stm32-e407_devboard
$ newt target set stm32_slinky build_profile=debug
$ newt target set stm32_slinky app=@apache-mynewt-core/apps/slinky

Build the Targets

Run the newt build stm32_boot command to build the bootloader:

$ newt build stm32_boot
Building target targets/stm32_boot
Compiling repos/apache-mynewt-core/boot/bootutil/src/image_ec256.c
Compiling repos/apache-mynewt-core/boot/bootutil/src/image_rsa.c
Compiling repos/apache-mynewt-core/boot/bootutil/src/loader.c
Compiling repos/apache-mynewt-core/boot/bootutil/src/image_ec.c
Compiling repos/apache-mynewt-core/boot/bootutil/src/image_validate.c
Compiling repos/apache-mynewt-core/crypto/mbedtls/src/aes.c
Compiling repos/apache-mynewt-core/boot/bootutil/src/bootutil_misc.c
Compiling repos/apache-mynewt-core/apps/boot/src/boot.c

      ...

Archiving sys_mfg.a
Archiving sys_sysinit.a
Archiving util_mem.a
Linking ~/dev/slinky/bin/targets/stm32_boot/app/apps/boot/boot.elf
Target successfully built: targets/stm32_boot
$

$newt build stm32_slinky
Building target targets/stm32_slinky
Compiling repos/apache-mynewt-core/boot/bootutil/src/image_ec.c
Compiling repos/apache-mynewt-core/boot/bootutil/src/image_rsa.c
Compiling repos/apache-mynewt-core/boot/bootutil/src/image_ec256.c
Compiling repos/apache-mynewt-core/boot/bootutil/src/loader.c
Compiling repos/apache-mynewt-core/boot/bootutil/src/image_validate.c
Compiling repos/apache-mynewt-core/boot/split/src/split.c
Compiling repos/apache-mynewt-core/boot/bootutil/src/bootutil_misc.c
Compiling repos/apache-mynewt-core/apps/slinky/src/main.c

       ...

Archiving util_crc.a
Archiving util_mem.a
Linking ~/dev/slinky/bin/targets/stm32_slinky/app/apps/slinky/slinky.elf
Target successfully built: targets/stm32_slinky
$

Run the newt create-image stm32_slinky 1.0.0 command to create and sign the application image. You may assign an arbitrary version (e.g. 1.0.0) to the image.

newt create-image stm32_slinky 1.0.0
App image succesfully generated: ~/dev/slinky/bin/targets/stm32_slinky/app/apps/slinky/slinky.img
$

Connect to the Board

  • Connect the USB A-B type cable to the ARM-USB-TINY-H debugger connector.
  • Connect the ARM-USB-Tiny-H debugger connector to your computer and the board.
  • Connect the USB Micro-A cable to the USB-OTG2 port on the board.
  • Set the Power Sel jumper on the board to pins 5 and 6 to select USB-OTG2 as the power source. If you would like to use a different power source, refer to the OLIMEX STM32-E407 user manual for pin specifications.

You should see a red LED light up on the board.

Run the newt load stm32_boot command to load the bootloader onto the board:

$ newt load stm32_boot
Loading bootloader
$
  • Select Options > List All Devices.
  • Select Olimex OpenOCD JTAG ARM-USB-TINY-H from the drop down menu.
  • Select the WinUSB driver.
  • Click Install Driver.
  • Run the newt load stm32_boot command again.

Connect Newtmgr with the Board using a Serial Connection

Locate the PC6/USART6_TX (pin 3), PC7/USART6_RX (pin 4), and GND (pin 2) of the UEXT connector on the Olimex board. More information on the UEXT connector can be found at https://www.olimex.com/Products/Modules/UEXT/. The schematic of the board can be found at https://www.olimex.com/Products/ARM/ST/STM32-E407/resources/STM32-E407_sch.pdf for reference.

Alt Layout - Serial Connection

  • Connect the female RX pin of the USB-TTL serial cable to the TX (Pin 3) of the UEXT connector on the board.
  • Connect the female TX pin of the USB-TTL serial cable to the RX (Pin 4) of the UEXT connector on the board.
  • Connect the GND pin of the USB-TTL serial cable to the GND (Pin 2) of the UEXT connector on the board.

  • Mac OS uses the format tty.usbserial-<some identifier>.

  • Linux uses the format TTYUSB<N>, where N is a number. For example, TTYUSB2.

  • MinGW on Windows uses the format ttyS<N>, where N is a number. You must map the port name to a Windows COM port: /dev/ttyS<N> maps to COM<N+1>. For example, /dev/ttyS2 maps to COM3.

    You can also use the Windows Device Manager to find the COM port number.

Run the newtmgr conn add command to define a newtmgr connection profile for the serial port. We name the connection profile stm32serial.

Note:

  • You will need to replace the connstring with the specific port for your serial connection.
  • On Windows, you must specify COM<N+1> for the connstring if /dev/ttyS<N> is the serial port.
$ newtmgr conn show
Connection profiles:
  stm32serial: type=serial, connstring='/dev/tty.usbserial-1d13'
  sim1: type=serial, connstring='/dev/ttys012'
$

Run the newtmgr echo hello -c stm32serial command. This is the simplest command that requests the board to echo back the text.

$ newtmgr echo hello -c stm32serial
hello
$

$ newtmgr image list -c stm32serial
Images:
 slot=0
    version: 1.0.0
    bootable: true
    flags: active confirmed
    hash: 9cf8af22b1b573909a8290a90c066d4e190407e97680b7a32243960ec2bf3a7f
Split status: N/A
$

$ newtmgr taskstat -c stm32serial
      task pri tid  runtime      csw    stksz   stkuse last_checkin next_checkin
      idle 255   0   157179   157183       64       25        0        0
      main 127   1        4       72     1024      356        0        0
     task1   8   2        0      158      192      114        0        0
     task2   9   3        0      158       64       30        0        0
$