This is the documentation for the latest (master) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

Cortex-M Trace Reference Board V1.2

Overview

The Cortex-M Trace Reference Board V1.2 (SEGGER-TRB-STM32F407 for short) board is a reference board, based on the ST Microelectronics STM32F407VE ARM Cortex-M4 CPU, to test hardware tracing with the SEGGER Trace-Pro debuggers. It is not meant for general prototype development because it is extremely limited when it comes to IO, and only has 3 LEDs.

SEGGER-TRB-STM32F407

SEGGER-TRB-STM32F407

Hardware

Information about the board can be found at the SEGGER website . The ST STM32F407VE website contains the processor’s information and the datasheet.

Supported Features

The SEGGER-TRB-STM32F407 board configuration supports the following hardware features:

Interface

Controller

Driver/Component

NVIC

on-chip

nested vectored interrupt controller

SYSTICK

on-chip

system clock

GPIO

on-chip

gpio

WATCHDOG

on-chip

independent watchdog

COUNTER

on-chip

rtc

RNG

on-chip

True Random number generator

Other hardware features are not supported by the Zephyr kernel.

Pin Mapping

LED

  • LED0 (green) = PA8

  • LED1 (green) = PA9

  • LED2 (green) = PA10

External Connectors

JTAG/SWD debug

PIN #

Signal Name

Pin #

Signal Name

1

VTref

2

SWDIO/TMS

3

GND

4

SWCLK/TCK

5

GND

6

SWO/TDO

7

8

TDI

9

NC

10

nRESET

11

5V-Supply

12

TRACECLK

13

5V-Supply

14

TRACEDATA[0]

15

GND

16

TRACEDATA[1]

17

GND

18

TRACEDATA[2]

19

GND

20

TRACEDATA[3]

System Clock

SEGGER-STM32F407-TRB has one external oscillator. The frequency of the main clock is 12 MHz. The processor can setup HSE to drive the master clock, which can be set as high as 168 MHz.

Programming and Debugging

The SEGGER-TRB-STM32F407 board is specially designed to test the SEGGER Trace-Pro debuggers, so this example assumes a J-Trace or J-Link is used.

Flashing an application to the SEGGER-TRB-STM32F407

Connect the J-Trace/J-Link USB dongle to your host computer and to the JTAG port of the SEGGER-TRB-STM32F407 board. Then build and flash an application.

Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b segger_trb_stm32f407 samples/basic/blinky
west flash

After resetting the board, you should see LED0 blink with a 1 second interval.

Debugging

Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b segger_trb_stm32f407 samples/basic/blinky
west debug