Problems using the Photon2 with the Particle debugger

Developer Tools
1

Hi all

Has anyone sucesfully used the particle debugger with the Photon 2.
I'we updated firmware in the debugger to v0254.2.

When toggling reset, i can connect to the device, with following log

/Users/au263437/.particle/toolchains/openocd/0.11.0-particle.4/bin/openocd -c "gdb_port 50000" -c "tcl_port 50001" -c "telnet_port 50002" -s /Users/au263437/.particle/toolchains/openocd/0.11.0-particle.4/share/openocd/scripts -f /Users/au263437/.vscode/extensions/marus25.cortex-debug-1.12.1/support/openocd-helpers.tcl -f interface/cmsis-dap.cfg -f target/rtl872x_km4_debug.cfg
xPack OpenOCD x86_64 Open On-Chip Debugger 0.11.0+dev (2022-03-25-19:34)
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
CDLiveWatchSetup
Info : Listening on port 50001 for tcl connections
Info : Listening on port 50002 for telnet connections
Info : CMSIS-DAP: SWD  supported
Info : CMSIS-DAP: Atomic commands supported
Info : CMSIS-DAP: FW Version = 0254.2
Info : CMSIS-DAP: Serial# = 310436023138a9461239333437353533a5a5a5a597969908
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready
Info : clock speed 1000 kHz
Info : SWD DPIDR 0x6ba02477
Info : [rtl872x.cpu] Cortex-M55 r1p0 processor detected
Info : [rtl872x.cpu] target has 2 breakpoints, 1 watchpoints
Info : [rtl872x.cpu] external reset detected
Info : starting gdb server for rtl872x.cpu on 50000
Info : Listening on port 50000 for gdb connections
Info : accepting 'gdb' connection on tcp/50000
target halted due to debug-request, current mode: Thread 
xPSR: 0x01000000 pc: 0x1010aa94 msp: 0x10004d84
> KM4: reset-assert-post event
0x480003f8: 02000201 

target halted due to debug-request, current mode: Thread 
xPSR: 0x01000000 pc: 0x10100100 msp: 0x1007effc
Info : SWD DPIDR 0x6ba02477
Error: Failed to read memory at 0x00000100

I use the suggested debug configuration in VSCode, and have experimented with disabling rtos, alternating between attach and launch.

I cannot capture execution at any breakpoints

    "configurations": [
        {
            "type": "cortex-debug",
            "request": "attach",
//            "request": "launch",
            "servertype": "openocd",
            "name": "Particle Debugger",
            "cwd": "${workspaceRoot}",
//            "rtos": "FreeRTOS",
            "armToolchainPath": "${command:particle.getDebuggerCompilerDir}",
            "executable": "${command:particle.getDebuggerExecutable}",
            "serverpath": "${command:particle.getDebuggerOpenocdPath}",
//            "preLaunchTask": "Particle: Flash application for debug (local)",
            "showDevDebugOutput": "raw",
            
            "searchDir": [
                "${command:particle.getDebuggerSearchDir}"
            ],
            "configFiles": [
                "${command:particle.getDebuggerConfigFiles}"
            ],
            "postAttachCommands": [
                "${command:particle.getDebuggerPostAttachCommands}"
            ],
            "particle": {
                "version": "1.0.1",
                "debugger": "particle-debugger"
            }
        },
1 Like
2

Hi-

Photon 2 is not fully supported by the debugger yet- we are working on it and there have been varying cases of success. We're looking into your issue internally and will see if we can recreate it.

1 Like
3

Hi Colleen,

Has there been any progress on supporting the Photon 2 with the particle debugger?

I am trying to connect a hardware debugger to the Photon 2, but I get the following log.

/Users/r/.particle/toolchains/openocd/0.11.0-particle.4/bin/openocd -c "gdb_port 50000" -c "tcl_port 50001" -c "telnet_port 50002" -s /Users/r/.particle/toolchains/openocd/0.11.0-particle.4/share/openocd/scripts -f /Users/r/.vscode/extensions/marus25.cortex-debug-1.12.1/support/openocd-helpers.tcl -f interface/cmsis-dap.cfg -f target/rtl872x_km4_debug.cfg -c "CDRTOSConfigure FreeRTOS"
xPack OpenOCD x86_64 Open On-Chip Debugger 0.11.0+dev (2022-03-25-19:34)
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
CDLiveWatchSetup
/Users/r/.vscode/extensions/marus25.cortex-debug-1.12.1/support/openocd-helpers.tcl: rtl872x.cpu configure -rtos FreeRTOS
Info : Listening on port 50001 for tcl connections
Info : Listening on port 50002 for telnet connections
Info : CMSIS-DAP: SWD  supported
Info : CMSIS-DAP: Atomic commands supported
Info : CMSIS-DAP: FW Version = 0254.2
Info : CMSIS-DAP: Serial# = 310436023138ce401239333437353533a5a5a5a597969908
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready
Info : clock speed 1000 kHz
Error: Error connecting DP: cannot read IDR

I am using the default debug configuration in VSCode. I've already verified that the debugger works properly with an Argon.

4

You should be able to use a CMSIS/DAP debugger like the Particle debugger with the P2, Photon 2, and M-SoM.

  • Make sure you have flashed debug-enabled firmware to the device. Because SWD is on pins shared with GPIO it defaults to not being enabled once user firmware starts.
  • "cannot read IDR" sometimes happens when the device or debugger get into a bad state and unplugging and powering down the Particle device and debugger and plugging everything back in helps
  • Make sure your Photon 2 is powered by USB or battery; it cannot be powered by the debugger.
1 Like