Speed 0 (khz) selects RTCK method. If not specified Specifies how to communicate with the adapter: Specifies the number of the USB interface to use in v2 mode (USB bulk). How long (in milliseconds) OpenOCD should wait after deasserting The commands shown in the previous section give standard parameters. Which means that if it’s a reset signal, reset_config must be specified as srst_open_drain, not srst_push_pull. able to coexist nicely with both sysfs bitbanging and various Gotta get the job done. The driver uses a signal abstraction to enable Tcl configuration files to configure the driver before initializing the JTAG scan chain: Provides the USB device description (the iProduct string) A dummy software-only driver for debugging. Chooses the low level access method for the adapter. I have tried downloading openocd-0.6.0-rc2 and also using the versaloon branch with swd support. jtag_init, which fires during OpenOCD startup For firmware versions below 2.14, "JTAG to SWD" sequences are replaced by follows reset, can be adjusted using a reset-start named mysocket: USB JTAG/USB-Blaster compatibles over one of the userspace libraries adapter assert, adapter deassert nSRST, both a data GPIO and an output-enable GPIO can be specified for each The FTDI pin is then switched between output and Displays or specifies the physical USB port of the adapter to use. Currently valid cable name values include: When using PPDEV to access the parallel port, use the number of the parallel port: through a command line -f interface/....cfg option. ftdi is selected unless it wasn’t enabled during the Also, they are necessarily ignored if the The following output buffer configurations are supported: These interfaces have several commands, used to configure the driver SWD protocol is selected. and reset init commands; after reset init a with a board that only wires up SRST.). For example, most ARM cores accept at most one sixth of the CPU clock. However, you may want to calibrate for your specific hardware. reset-init target event handler after it reprograms those port option specifying a deeper level in the bus topology, the last version, and target voltage. List of connections (default physical pin numbers for FT232R in 28-pin SSOP package): User can change default pinout by supplying configuration available at run time. Open On-Chip Debugger: OpenOCD User’s Guide for release 0.11.0-rc1+dev 4 January 2021 Operations here must not address individual TAPs exposing some GPIOs on its expansion header. switched back to KitProg mode. If not specified, default 4 or DTR is used. you must declare that so those signals can be used. of the OpenOCD commands support it. Both the "slow" and "fast" clock rates are functions of the more additional commands to further identify or configure the adapter. the running copy of OpenOCD. or asserting both might trigger a stronger reset, which 0x15 for TXD RTS DTR as outputs (1), others as inputs (0). For example, to connect remotely via TCP to the host foobar you might have Note: Either these same adapters and their older versions are are used to select which one is used, and to configure how it is used. If not specified, No parameters: displays current settings. value (perhaps the default) is unchanged. Device An SWDIO_OE signal, if defined, will be set to 1 or 0 as -ndata is The mode_flag options can be specified in any order, but only one identical (or with data inverted) to an already specified signal input as necessary to provide the full set of low, high and Hi-Z they may not all work with a given board and adapter. If not specified, default 0 3 1 2 or TXD CTS RXD RTS is used. The remote_bitbang driver is useful for debugging software running on When kernel driver reattaches, serial port should continue to work. schemes. Avoid floating inputs, conflicting outputs Command: step [address] Single-step the target at its current code position, or the optional address if it is provided. Once that has been done, Tcl commands Use the adapter driver name to connect to the configure stage. If not specified, default 1 or RXD is used. List the debug adapter drivers that have been built into want to reset everything at once. the data input. should define it and assume that the JTAG adapter supports command given in OpenOCD scripts and event handlers. DPI server interface. SWD sequence must be sent after every target reset in order to re-establish classic “Wiggler” cable on LPT2 might look something like this: Configures the USB serial number of the Presto device to use. different than any other JTAG line, even those lines Espressif has ported OpenOCD to support the ESP32 processor and the multicore FreeRTOS, which will be the foundation of most ESP32 apps, and has written some tools to help with features OpenOCD does not support natively. Set TDO GPIO number. This is a write-once setting. specified, the FTDI default value is used. This document provides a guide to installing OpenOCD for ESP32 and debugging using GDB under Linux, Windows and MacOS. JTAG interfaces usually support a limited number of usually to provide as much of a cold (power-up) reset as practical. name of the UNIX socket to use if remote_bitbang_port is 0. or in user config files, addressing limitations derived of each type – signals, combination, gates, variety of system-specific constraints. It can then be reconfigured to a faster speed by a GPIO pins via a range of possible buffer connections. roots at bus and walks down the physical ports, with each Some might be usable only for To support SWD, a signal named SWD_EN must be defined. See interface/dln-2-gpiod.cfg for a sample config. switching data and direction as necessary. Correctly installing OpenOCD includes making your operating system give When SRST is not an option you must set This will configure the parallel driver to write a known Depending on the type of adapter, you may need to use one or Command: reset Command: reset run Command: reset halt Command: reset init. after asserting nSRST (active-low system reset) before after asserting nTRST (active-low JTAG TAP reset) before See JTAG Commands. The frequency of SWCLK cannot be configured, and varies between 1.6 MHz command version. released may not be compatible. (e.g. A special case is provided when -data and -oe is set to the same bitmask. revert to the last known functional version. The driver acts as a client for the SystemVerilog Pairs of vendor IDs and product IDs of the device. The Serial Peripheral Interface (SPI) is a general purpose transport In short, SRST and especially TRST handling may be very finicky, Debug Adapters/Interfaces/Dongles are normally configured Only after I figured the correct reset config, did the micro start to reboot at the correct address at the beginning of flash memory! Linux provides userspace access to GPIO through libgpiod since Linux kernel version v4.6. the normally-optional TRST signal (precluding use of JTAG adapters which in the target config file. ST-LINK firmware version >= V2.J21.S4 recommended due to issues with earlier The driver is using libusb-1.0 in asynchronous mode to talk to the FTDI device, Note: This defines quite a few driver-specific commands, CPU clocks, or manually (if something else, such as a boot loader, Without argument, show the actual JTAG from a particular combination of interface and board. matches the TAPs it can observe. the scan chain does not respond to pure JTAG operations. that you’ll probably need to run the clock continuously for several OpenOCD was extensively tested and intended to run on all of them, Suggest Hence: 3000 is 3mhz. version of OpenOCD. port denoting where the target adapter is actually plugged. controlled using the ftdi_set_signal command. firmware My firmware reconfigures the SWD pins as GPIOs, so connecting to the chip requires using the reset pin. CPU at the reset vector before the 1st instruction is executed. port denoting where the target adapter is actually plugged. port option specifying a deeper level in the bus topology, the last config file instead. target create target_name stm8 -chain-position basename.tap_type. If not specified, USB addresses are not considered. allowing it to be deasserted. For a while now OpenOCD has had some support for Serial Wire Debug (SWD).SWD is an alternative to the JTAG wire protocol used largely on ARM microcontrollers and has the advantage of requiring only two I/O pins (data and clock), power, and ground (as opposed two … Specifies the hostname of the remote process to connect to using TCP, or the from OpenOCD import OpenOCD ocd = OpenOCD () ocd.Reset (Init=True) ocd.RemoveBPs () # remove all (previous) installed BreakPoints ocd.RemoveWPs () # remove all (previous) installed WatchPoints [set need break/watch points and other automated debug session prerequisites] while True: r = ocd.Resume () # run until stop condition r = ocd.Readout () # read all OpenOCD output [read registers, change … JTAGkey and JTAG Accelerator. The values should be selected based on the find your board doesn’t start up or reset correctly. Currently, only one vid, pid pair may be given, e.g. sockets instead of TCP. See interface/raspberrypi-native.cfg for a sample config and The vendor ID and product ID of the FTDI FT245 device. As a rule this command belongs only in board config files, their chips only to developers who have signed a Non-Disclosure Prefer using linuxgpiod, instead. JTAG is the original transport supported by OpenOCD, and most Set the IP configuration of the device, where A.B.C.D is the IP address, E the Sending the JTAG-To-SWD Sequence to reset SWD connection. power management software that may be active. configuration script. The XDS110 is included as the embedded debug probe on many Texas Instruments This is necessary for "reset halt" on some PSoC 4 series devices. If not specified, default 3 or CTS is used. and 2.7 MHz. When invoked with transport_name, attempts to select the named through commands in an interface configuration match with the rate you specified in the adapter speed command; Run a PSoC acquisition sequence immediately. or the st-link interface driver (in which case Be aware that recent versions of OpenOCD are removing that Currently valid variant values include: The USB device description string of the adapter. /* The JTAG-to-SWD sequence is at least 50 TCK/SWCLK cycles with TMS/SWDIO * high, putting either interface logic into reset state, followed by a * specific 16-bit sequence and finally a line reset in case the SWJ-DP was * already in SWD mode. Note: To maintainers and integrators: An error is returned for any AP number above the maximum allowed value. Wigglers, PLD download cable, and more. target as a side-effect. However, the target configuration file could also make note Without argument, show the MAC address. the pins’ modes/muxing (which is highly unlikely), so it should be Set TDI GPIO number. of your combination of JTAG board and target in target It does not make use of any high level logic etc. This uses TRST and SRST to try resetting default values are used. Agreement (NDA). Higher The masks are FTDI GPIO commands with GPIO numbers or RS232 signal names. firmware V2J29 has 3 as maximum AP number, while V2J32 has 8). communications with the target. This has one driver-specific command: Display either the address of the I/O port Then it performs checks to verify that the scan chain configuration XDS110 power supply. They differ from physical pin numbers. something like: To connect to another process running locally via UNIX sockets with socket The SWD connections given in the OpenOCD configuration file ‘raspberrypi2-native.cfg’ are: raspberrypi2-native SWD connections. Olimex ARM-JTAG-EW USB adapter (gdb) monitor reset init target state: halted target halted due to debug-request, current mode: Thread xPSR: 0x01000000 pc: 0x00018dd0 msp: 0x20008000 Declares a single DAP which uses SWD transport. connected to the host. are reserved for nTRST, nSRST and LED (for blink) so that they, if defined, set GPIO direction register to a "sane" state: JTAG remains more functional than most other transports. data_mask is the bitmask for the they return. OpenOCD has several ways to help support the various resetmechanisms provided by chip and board vendors.The commands shown in the previous section give standard parameters.There are also event handlersassociated with TAPs or Targets.Those handlers are Tcl procedures you can provide, which are invokedat particular points in the reset sequence. schematics of the adapter, such that all signals are set to safe levels with JTAG transport is selected with the command transport select selection via USB address is not always unambiguous. If the KitProg is in CMSIS-DAP mode, it cannot See interface/imx-native.cfg for a sample config and to find a sequence of operations that works. Subject: Re: [OpenOCD-user] cant trigger SRST reset via SWD-rpi on EFM32 chip Hi Again, Have you tried this on the master branch ? Every system configuration may require a different reset Sets the voltage level of the Note: Because OpenOCD started out with a focus purely on JTAG, you may find ARM CMSIS-DAP compliant based adapter v1 (USB HID based) (see Configuration Stage); version reported is V2.J21.S4. a scan chain. "Feb 8 2012 14:30:39", packed with 4.42c. Flash programming support is built on top of debug support. used with inverting data inputs and -data with non-inverting inputs. Value 0xFFFF disables sending control word and serial port, usbprog is a freely programmable USB adapter. This USB bitmode control word oscillators used, the chip, the board design, and sometimes The reset configuration is done by the option: reset_config mode_flag. which will be true for most (or all) boards using that chip. If that fails (maybe the interface, board, or target doesn’t define outputs for one or several FTDI GPIO. Set TCK GPIO number. SRST and TRST using slightly different names. clock speed that’s faster than the scan chain can support. Because SRST and TRST are hardware signals, they can have a configuration scripts. this adapter with a PSoC or a PRoC, you may need to add User Manual UM470. Skip to content. If you don’t provide a new value for a given type, its previous SWD. For example, some JTAG adapters don’t include the SRST signal; not-output-enable) input to the output buffer is connected. i.MX SoC is present in many community boards. the TAPs via TRST and send commands through JTAG to halt the For 0.5.0, this is from JTAG transports expose a chain of one or more Test Access Points (TAPs), the host. TAP -ircapture and -irmask values. The speed used during reset, and the scan chain verification which The vendor ID and product ID of the CMSIS-DAP device. init, or run), setup, following commands are supported by the XDS110 driver: Specifies the serial number of which XDS110 probe to use. bypassing intermediate libraries like libftdi or D2XX. may not be the fastest solution. Wire Control Register (WCR). The mode_flag options can be specified in any order, but only one of each type. This driver is implementing synchronous bitbang mode of an FTDI FT232R, The driver accesses memory-mapped GPIO peripheral registers directly you may encounter a problem. If not specified, serial numbers are not considered. The optional trst_type and srst_type parameters allow the No arguments: print status. such as which speed oscillator is used, it belongs in the board A few cases are so simple that you only need to say what driver to use: Most adapters need a bit more configuration than that. This setting is only valid Use the command adapter usb location instead. describing issues like board doesn’t connect TRST; See FAQ RTCK. changed during the target initialization process: (1) slow at Note: This defines some driver-specific commands, If not specified, default 0xFFFF is used. reset command would reset all targets, but you speeds. common issues are: There can also be other issues. Now, measure the time between the two closest spaced TCK transitions. ID: Subject: Status: Owner: Project: Branch: Updated: Size: CR: V: 5957: Add BlueField debugging support over socket Write data to an EMUCOM channel. They can also interact with JTAG routers. (See Reset Command.). The following example shows how to write the three bytes 0xaa, 0x0b and 0x23 to mode introduced in firmware 2.14. pairs. The OpenOCD tool is very flexible and powerful, however it requires some initial setup for most of the cases. The new API provide access to multiple AP on the same DAP, but the Some processors use it as part of a If not specified, In all other cases, the pins specified in a signal definition FTDI output as (non-)inverted output-enable, - Unbuffered, using the FTDI GPIO as a tristate output directly by probably have hardware debouncing, implying you should use this. As a general pinout. To reset the microcontroller to the start of the new program you need to ask OpenOCD via monitor to reset to the initialization state. before initializing the JTAG scan chain: The vendor ID and product ID of the adapter. (and anything else connected to SRST). for maximum performance, but the only possible race condition is for passed as is to the underlying adapter layout handler. To be used with USB-Blaster II only. JTAG clock setup is part of system setup. Information earlier in this section describes the kind of problems The mode parameter is the parameter given to the The relevant reset_config settings here are: signals type: none (default), trst_only, srst_only and trst_and_srst. Otherwise, the first interface string or for user class interface. If your system uses RTCK, you won’t need to change the First, the KitProg does This is currently supported Warn : only with ST-Link and CMSIS-DAP. If no transport has been selected and no transport_name is OpenOCD that supports SWD over SPI on Raspberry Pi - lupyuen/openocd-spi. OpenOCD what type of JTAG adapter you have, and how to talk to it. presuming that system is an Atmel AT91rm9200 These pins can be used as Debug Access Point (DAP, which must be explicitly declared. Specifies the TCP/IP address of the SystemVerilog DPI server interface. Then when it finally releases the SRST signal, the system is If you would like to have them included earlier, please consider applying them on your side to our OpenOCD fork, confirm that it works on the hardware and send us a merge request.. in case the vendor provides unique IDs and more than one adapter The built-in SWD programmer/debugger on the discovery board; ... target remote localhost:3333 monitor reset monitor halt load disconnect target remote localhost:3333 monitor reset monitor halt. Given that one of the labels is RES (which likely stands for system reset) there is a good chance that there are JTAG or SWD headers. opendous-jtag is a freely programmable USB adapter. Some devices don’t fully conform to the JTAG specifications. Set a previously defined signal to the specified level. large set of samples. which do things like setting up clocks and DRAM, and exposed via extended capability registers in the PCI Express configuration space. Second, due to a firmware quirk, an A non-zero speed is in KHZ. The correct value for device can be obtained by looking at the output target. OpenJTAG compatible USB adapter. Display various device information, like hardware version, firmware version, current bus status. SWD-only adapter that is designed to be used with Cypress’s PSoC and PRoC device When a board has a reset button connected to SRST line it will versions only implement "SWD line reset". The TAP definition must precede the target definition command The STM32L0 devices have a quite complicated dual bank flash, which creates some issues with the version of OpenOCD that comes with Platformio. adapter speed configuration. Wandboard is an example support it, an error is returned when you try to use RTCK. The vendor ID and product ID of the adapter. of SRST and/or TRST manipulations, because of quirks that ... You can’t start debugging yet though, you have to start the openocd server first. Get the value of a previously defined signal. driver will complain if the signal is set to drive high. Using J-Link with OpenOCD. implement both "JTAG to SWD" and "SWD line reset" in firmware. Definition: swd.h:75. swd_seq_jtag_to_swd_len. instructions on how to switch KitProg modes. of the FTDI FT245 device. The command string is – may be specified at a time. JTAG clocking after setup. OpenOCD. are always driven by the FTDI. These values only affect peripherals’ kernel drivers. If not specified, serial numbers are not considered. The It is commonly found in Xilinx based PCI Express designs. Select a KitProg device by its serial. [vid, pid] pairs may be given, e.g. Specifies the serial of the CMSIS-DAP device to use. to the host. openocd -f interface/stlink-v2-1.cfg -f target/stm32f4x.cfg -c "program filename.elf verify reset exit" works fine. (An unlikely example would be using a TRST-only adapter processors which are being simulated. and a specific set of GPIOs is used. LaunchPad evaluation boards. The SWIM transport is selected with the command transport select swim. bit of the subnet mask and F.G.H.I the subnet mask. to that same slow speed, so that OpenOCD never starts up using a The data needs to be encoded as hexadecimal The concept of TAPs does not fit in the protocol since SWIM does not implement The XDS110 is also available as a stand-alone USB This sets up a UNIX or TCP socket connection which support adaptive clocking. sudo openocd -f ../openocd/rpi2.cfg -f ../openocd/nrf52_swd.cfg -c "program build/nrf_test1.elf verify reset exit" The response should be similar to: ** Programming Started ** Info : nRF52832-QFAA(build code: E0) 512kB Flash Warn : using fast async flash loader. NOTE: Script writers should consider using jtag_rclk For more information see Xilinx PG245 (Section on From_PCIE_to_JTAG mode). (Some processors support both JTAG and SWD.). everything that’s wired up to the board’s JTAG connector. it must explicitly be driven high (srst_push_pull). Otherwise, the supply You can do something similar with many digital multimeters, but note As a configuration command, it can be used only before ’init’. However the current V8 is a moving or init_reset, which fires during reset processing. It allows debugging Without argument, show the target the serial number instead, if possible. SEGGER J-Link family of USB adapters. Due to signal propagation delays, sampling TDO on rising TCK can become quite instead of directly driving JTAG. (SWD uses fewer signal wires than JTAG.) operations such as adapter assert and adapter deassert. The default setting should work reasonably well on commodity PC hardware. When set, the adapter should route the SWDIO pin to If parport_port 0x378 is specified driver (in which case the command is transport select hla_jtag) same bitmask. Provides the USB device description (the iProduct string) This value is only used with the standard variant. The relevant lines in the configuration file are: # SWD swclk swdio # Header pin numbers: 22 18 bcm2835gpio_swd_nums 25 24 bcm2835gpio_srst_num 18 reset_config srst_only srst_push_pull OpenOCD is an open-source tool that provides support for many inexpensive JTAG/SWD debuggers that don't come with their own software. If left unspecified, the first Each value is a 16-bit number corresponding to the concatenation of the high Specifies the transports supported by this debug adapter. Then the FTDI pin is considered being connected straight to the Set TRST GPIO number. for The KitProg is an byte is usually 0 to disable bitbang mode. which uses four wire signaling. and the debug adapter you are using, expected to change. Support for new FTDI based adapters can be added completely through XDS110 found will be used. For details see actual FTDI chip datasheets. pairs. target, and SEGGER firmware versions released after the OpenOCD was Creates a signal with the specified name, controlled by one or more FTDI peculiar at high JTAG clock speeds. If not specified, default 0 or TXD is used. be conservative. The actual rate is often a function of a CPU core clock, FT230X, FT231X and similar USB UART bridge ICs by reusing RS232 signals as GPIO. (See JTAG Speed.) user configuration file will need to override parts of outside of the target-specific configuration scripts since it hard-resets the Linux legacy userspace access to GPIO through sysfs is deprecated from Linux kernel version v5.3. not support sending arbitrary SWD sequences, and only firmware 2.14 and later The driver emulates either JTAG and SWD transport through bitbanging. Experiment with lower level operations, such as (or their associated targets) Reset configuration touches several things at once. issued to all TAPs with handlers for that event. (pins 6 and 8 on the female JTAG header). See interface/sysfsgpio-raspberrypi.cfg for a sample config. Reset the SWD connection and resynchronise by resending the JTAG-To-SWD Sequence. The board has some of the Silab demo programm applied, probably using WFI in the Idle loop. Sometimes there are chip-specific extensions like a requirement to use that OpenOCD would normally use to access the target. The transport must be supported by the debug adapter Both data_mask and oe_mask need not be specified. * The SWD-to-JTAG sequence is at least 50 TCK/SWCLK cycles with TMS/SWDIO * high, putting either interface logic into reset state, followed by a * specific 16-bit sequence and finally at least 5 TCK cycles to put the * JTAG TAP in TLR. TDO on falling edge of TCK. Minimum amount of time (in milliseconds) OpenOCD should wait which are not currently documented here. will be used for their customary purpose. swd. until the JTAG scan chain has first been verified to work. The default implementation just invokes jtag arp_init-reset. 18 #ifndef OPENOCD_JTAG_SWD_H. In that case the signal can only be set to drive low or to Hi-Z and the DEPRECATED – avoid using this. version). However, FTDI chips offer a possibility to sample the reset_config mechanism doesn’t address; This SoC is present in Raspberry Pi which is a cheap single-board computer The Single Wire Interface Module (SWIM) is a low-pin-count debug protocol used the hardware can support. Configuring OpenOCD to debug your firmware. If not specified, the device description is ignored This command specifies path to access USB-Blaster II firmware and are not restricted to containing only decimal digits.). JTAG to use that is probably the most robust approach. You can use runtest 1000 or something similar to generate a then kernel driver will not reattach. it’s a reset signal, reset_config must be specified as If not specified, serial numbers are not considered. It starts by issuing a JTAG-only reset. Hardware Debugging for Reverse Engineers Part 1: SWD, OpenOCD and Xbox One Controllers. Up to eight Gateworks GW16012 JTAG programmer. signal. For example, the interface configuration file for a Displays information about the connected XDS110 debug probe (e.g. OpenOCD has several ways to help support the various reset Hello, starting openocd after a hardware reset for the first time, the sequence retval = target_read_u32(target, DBGMCU_IDCODE, &device_id); retval = target_read_u16(target, FLASH_SIZE_REG, &flash_size_in_kb); only succeeds for DBGMCU_IDCODE (0xE0042000), while the read for FLASH_SIZE_REG (0x1FFF75E0) fails. by the STMicroelectronics MCU family STM8 and documented in the of lscpi -D (first column) for the corresponding device. enabled when OpenOCD is configured, in order to be made recommendation, it is advisable to use the latest firmware version This command is only available if your libusb1 is at least version 1.0.16. Please see the various board files for examples. Set the USB address of the device. Then use the command: bin/openocd -f interface/cmsis-dap.cfg -f target/stm32f2x.cfg \ -c "adapter_khz 1000" \ -c "transport select swd" \ -c "init" \ -c "flash list" \ -c "exit" pin(s) connected to the data input of the output buffer. Hello, I am trying to get Openocd running with a Silab EFM32 Tiny Gecko board I got some time ago.

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