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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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Serial Wire Debug (SWD) is a two-wire protocol for accessing the ARM debug interface. It is part of the ARM Debug Interface Specification v5 and is an alternative to JTAG. The physical layer of SWD consists of two lines: SWDIO: a bidirectional data line. SWCLK: a clock driven by the host.
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The EFM32 family uses Serial Wire Debug (SWD) which is a two-wire protocol for accessing the ARM debug interface. The pins re- quired to program these devices are SWDIO and SWCLK.
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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...
Serial Wire Debug overview. Serial Wire Debug (SWD) is a 2-pin (SWDIO/SWCLK) electrical alternative JTAG interface that has the same JTAG protocol on top. SWD uses an ARM CPU standard bi-directional wire protocol, defined in the ARM Debug Interface v5.
Jul 9, 2021 · See more info on Debug modes in the User Manual for your STK. (For a low-level treatment of the SWD interface, see Application Note "AN0062: Programming Internal Flash Over the Serial Wire Debug Interface") The " In-House Programming " section is also applicable to EFM32 devices.
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Does efm32/efr32/ezr32 have a Serial Wire Debug (SWD) interface?
How do I send SWD commands to the EFM32?
What is Serial Wire Debug (SWD)?
How many SWDIO & SWCLK pins does the EFM32 have?
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).
