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SWD Interface This application note describes a standalone programmer to program the internal flash and user page of EFM32 Gecko, Series 0 and 1, EZR32 Ser-ies 0, and EFR32 Wireless Gecko Series 1 devices that use the Serial Wire Debug (SWD) interface. Details on how to use the SWD interface to program device can be found in AN0062: Programming
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This document explains how to access the debug interface of the EFM32 and how to use this interface to program devices (load applications into flash). It also explains how to lock and unlock debug access to the MCU to protect the contents of the internal flash and SRAM. This application note includes: This PDF document. Source files (zip)
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The EFM32 microcontrollers use the ARM CoreSightTM on-chip debug and trace interface. Serial Wire Debug technology (SWD), specifically the Serial Wire Debug Port (SW-DP) for the EFM32, is used as the interface between the on-chip debug module and the development environment on a computer.
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- Overview of OpenOCD
- Overview of FT2232H
- Be Aware Before Selecting OpenOCD
- Requirements
- How OpenOCD Is Organized
- Understanding The Basics of Adapter Configuration
- Connecting Target with Adapter
- Part 2: Run OpenOCD
- Part 5: Communicate with Target
- Troubleshooting
Open On-Chip Debugger (OpenOCD) is a free, open-source project that aims to provide debugging, in-system programming, and boundary scan using a debug adapter. The adapter is a hardware module that provides the right signals for the target to understand. OpenOCD debugger supports a lot of debugging adapters, which can be viewed on the OpenOCD websit...
FT2232H is dual high-speed USB to multipurpose UART/FIFO IC. This means it is a single-chip USB with dual ports. Every port is equipped with an engine called a Multi-Protocol Synchronous Serial Engine (MPSSE) to simplify a synchronous serial protocol (USB to JTAG, I2C, SPI, or bit-bang) design. This allows users to configure the channel with the de...
Selecting OpenOCD as your debugging tool with an adapter like FT2232H is a very good choice when you don’t have much budget to work with. In addition to being free and open source, OpenOCD also has a good support community. BUT, as with any other open-source tool, you could face bugs you may need to fix by yourself. It took me some time to understa...
Here is what you'll need to complete this tutorial: 1. FT2232H breakout board 2. Windows or Linux OS with a working copy of OpenOCD 3. Target chip to flash Let's go over each piece individually. 1. FT2232H breakout board: You can get a cheap one from Chinese suppliers like Taobao, Alibaba, and AliExpress. I ordered mine from Taobaofor about $14. Yo...
To make OpenOCD run, you just need a correct configuration file (.cfg) supplied to OpenOCD. This configuration file has commands which are extensions to Jim-Tcl. Jim-Tcl is a programming language that provides a simple and extensible command interpreter. The OpenOCD directory file has a folder called “scripts”. In this folder, you will see "interfa...
First, we need to tell OpenOCD the type of adapter that it will work with by using an interface command. To see the complete list of interfaces that your version of OpenOCD supports, use this command: >openocd -c interface_list In our tutorial, we will use an adapter with FT2232H chip, so we will use an FTDI interface driver: interface ftdi You mus...
There is a configuration file called “swd-resistor-hack.cfg” that includes a wiring diagram: The file includes a note: “Connect TDI to SWDIO via a suitable series resistor (220-470 Ohm or so depending on the drive capability of the target and adapter) connect TDO directly to SWDIO.” Without wiring this resistor in this way, a connection will not be...
First, make a special configuration file to our adapter. Create a new txt file (ANYNAME.cfg). Remember to edit the VID/PID and serial to match your chip: Note:Defining the SWD_EN signal is important for making OpenOCD work, even though we didn’t connect it physically. If we don't, an error will appear: Error: SWD mode is active but SWD_EN signal is...
Remember to halt your target before any debugging operations: >reset halt You will get something like: target state: halted target halted due to debug-request, current mode: Thread xPSR: 0x01000000 pc: 0x00000bbc msp: 0x20002000 To read internal registers from our chip, type: >reg To flash an image to internal flash, we need to define internal flas...
Example error 1: 1. Error: unable to open ftdi device: usb_open() failed This error could be caused by using libusb driver in windows while new versions of OpenOCD use WinUSB driver. First, make sure that you stop Windows from installing a driver automatically: Then remove your default FTDI driver. You can use a tool from FTDI called CDM Uninstalle...
Jul 9, 2021 · The Serial Wire Debug (SWD) is a two-wire protocol for accessing the ARM debug interface. Its physical layer consists of two lines, a bidirectional data line (SWDIO) and a clock driven by the host (SWCLK).
Jul 9, 2021 · How do I program EFM32 devices via command line? Answer. To program via command line, you can use a Segger debugger (either a standalone device or the J-Link on-board Silicon Labs MCU Starter Kit (STK) and Wireless Starter Kit (WSTK) boards) and a utility that provides a command line interface. Two such options are described below:
People also ask
How do I send SWD commands to the EFM32?
Does efm32/efr32/ezr32 have a Serial Wire Debug (SWD) interface?
How many SW-DP pins does the EFM32 microcontroller have?
Does EFM32 implement SWJ-DP?
Jul 9, 2021 · The first few sections discuss using C2 and/or JTAG interfaces with a production programmer, which is not applicable to the classic EFM32 devices (which use SWD as the debug interface). However, the page does address EFM32 programming by:
