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Update to probe-rs v0.31.0#619

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Update to probe-rs v0.31.0#619
labbott wants to merge 3 commits into
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probe-rs-v0.31.0

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@labbott labbott commented Apr 16, 2026

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@labbott labbott marked this pull request as draft April 16, 2026 12:43
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sdonnan commented Apr 16, 2026

Windows test run:

PS E:\stuart\working\humility> git log -1 --oneline
02547623 (HEAD -> probe-rs-v0.31.0, origin/probe-rs-v0.31.0) WIP: hold my beer I want to update probe-rs

PS E:\stuart\working\humility> cargo run --release -- lsusb
    Finished `release` profile [optimized + debuginfo] target(s) in 0.65s
     Running `target\release\humility.exe lsusb`
humility: USB device scan, 2 successful and 6 failed
humility: --- successfully opened devices ---
humility: format: VID:PID:SERIAL, then manufacturer name, then product name
humility: 046d:c628:(serial unknown)    3Dconnexion     SpaceNavigator for Notebooks
humility: 38c6:0001:000000803b5a95305d5cc175fa18799758892acd4c504355    Oxide   CMSIS-DAP v1
humility: --- failures ---
humility: could not access 6 devices:
... snip ...

PS E:\stuart\working\humility> cargo run --release -- probe
    Finished `release` profile [optimized + debuginfo] target(s) in 0.64s
     Running `target\release\humility.exe probe`
humility: attached via CMSIS-DAP V2 IF: 4 DESC: Some(InterfaceAltSetting { interface_number: 4, alternate_setting: 0, num_endpoints: 2, class: 255, subclass: 0, protocol: 0, string_index: Some(9), endpoints: [Endpoint { address: 0x05, direction: Out, transfer_type: Bulk, max_packet_size: 512, packets_per_microframe: 1, interval: 0 }, Endpoint { address: 0x85, direction: In, transfer_type: Bulk, max_packet_size: 512, packets_per_microframe: 1, interval: 0 }] })
humility:        probe => OxLink (CMSIS-DAP), VID 38c6, PID 0001
humility: probe serial => 000000803b5a95305d5cc175fa18799758892acd4c504355
humility:         core => Cortex-M7
humility: manufacturer => STMicroelectronics
humility:         chip => STM32H7, revision 0x2003
humility:       status => executing, debug halt
humility:  debug units => CSTF(x2) CTI(x2) DWT ETM FPB ITM SCS SWO TMC TPIU
humility:         CSTF => 0x5c004000, 0x5c013000
humility:          CTI => 0x5c011000, 0xe0043000
humility:          DWT => 0xe0001000
humility:          ETM => 0xe0041000
humility:          FPB => 0xe0002000
humility:          ITM => 0xe0000000
humility:          SCS => 0xe000e000
humility:          SWO => 0x5c003000
humility:          TMC => 0x5c014000
humility:         TPIU => 0x5c015000
humility:           R0 => 0x24078900
humility:           R1 => 0x24078900
humility:           R2 => 0x0
humility:           R3 => 0x0
humility:           R4 => 0x0
humility:           R5 => 0x0
humility:           R6 => 0x0
humility:           R7 => 0x240788f8
humility:           R8 => 0x0
humility:           R9 => 0x0
humility:          R10 => 0x0
humility:          R11 => 0x0
humility:          R12 => 0x0
humility:           SP => 0x240788f8
humility:           LR => 0x805fd6f
humility:           PC => 0x805fd74
humility:          PSR => 0x61000000
humility:          MSP => 0x240003b0
humility:          PSP => 0x240788f8
humility:          SPR => 0x7000000

Seems happy!

@labbott labbott force-pushed the probe-rs-v0.31.0 branch from fce004e to fbe787d Compare May 18, 2026 16:53
@labbott labbott changed the title WIP: update to probe-rs v0.31.0 Update to probe-rs v0.31.0 May 18, 2026
@labbott labbott marked this pull request as ready for review May 18, 2026 17:28
@labbott labbott force-pushed the probe-rs-v0.31.0 branch from fbe787d to 4632566 Compare May 21, 2026 18:44
@labbott labbott requested review from cbiffle, hawkw and mkeeter May 21, 2026 18:48
mkeeter
mkeeter reviewed May 21, 2026
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Comment thread cmd/debugmailbox/src/lib.rs
// Get a list of all available debug probes.
let probes = Probe::list_all();
let list = probe_rs::probe::list::Lister::new();
let probes = list.list_all();
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@mkeeter mkeeter May 21, 2026

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ah, I love the smell of fresh API design in the morning

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mkeeter reviewed May 21, 2026
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Comment thread cmd/rendmp/src/lib.rs
use std::thread;
use std::time::{Duration, Instant};
use strum::VariantNames;
use strum::VariantNames as _;
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@mkeeter mkeeter May 21, 2026

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spooky

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mkeeter reviewed May 21, 2026
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Comment thread humility-probes-core/src/lib.rs Outdated
mkeeter
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Comment thread humility-probes-core/src/lib.rs
{
bail!("USB link in use; is OpenOCD or another debugger running?");
}

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@mkeeter mkeeter May 21, 2026

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It looks like the Usb variant still exists, should we keep this block?

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@labbott labbott May 21, 2026

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We now get back a raw std::io::Error which does not have downcast_ref, only downcast (https://doc.rust-lang.org/stable/std/io/struct.Error.html) and it was faster to just pull it out when I was doing the upgrade. It wasn't clear if there was still value in keeping it. Looking again, the flow of this entire function is weird so I'm going to take a pass to see if I can make it more reasonable.

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@labbott labbott May 22, 2026

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I did some tweaks and I think I brought it back. I'm still not clear on the value but if we run into more errors that need better messages we can add more.

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Comment thread humility-probes-core/src/lib.rs Outdated
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Comment thread humility-probes-core/src/lib.rs Outdated
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Comment thread humility-probes-core/src/lib.rs Outdated
mkeeter
mkeeter reviewed May 21, 2026
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Comment thread humility-probes-core/src/probe_rs.rs Outdated
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Comment thread humility-probes-core/src/probe_rs.rs Outdated
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Comment thread Cargo.toml
#
# We depend on the oxide-stable branch of Oxide's fork of probe-rs to assure
# that we can float necessary patches on probe-rs.
# that we can float necessary patches on probe-rs.
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@mkeeter mkeeter May 21, 2026

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Nit: linewrap this whole block?

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Comment thread cmd/debugmailbox/src/lib.rs
probe: &mut Box<dyn ArmProbeInterface + '_>,
ap: &ApAddress,
addr: u8,
probe: &mut Box<dyn ArmDebugInterface + '_>,
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@mkeeter mkeeter May 21, 2026

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I wondered if we could remove the Box here (in favor of a &mut dyn ArmDebugInterface), but poking at it shows that it would ripple through a bunch of places, so out of scope for this PR.

labbott added 2 commits May 22, 2026 01:32
@labbott
Update to probe-rs v0.31.0
4632566 
This is a big jump and hopefully some architecture rework will mean
we can update faster as needed.
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labbott commented May 22, 2026 •
edited
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This discussion may need to go elsewhere but I'm putting it here for now:

One of the advantages of updating to a newer probe-rs is we can avoid a dependency on libusb and just use the native Rust nusb library. The catch is this only works with CMSIS-DAP v2 probes. Our out of the box MCULinks are running old firmware and only support CMSIS-DAP v1 which uses the hidapi crate which is secretly libusb . We've had to do some hacks to make this work (see #202 and #466). Some options here:

A) We allow using CMSIS-DAP v1 probes and continue supporting HID via libusb. I do not love this option because 1) We've had problems with hid/libusb in the past and we'll have to continue with our hacks 2) We'll now have to deal with a potential mixture of CMSIS-DAPv1 and CMSIS-DAP v2 probes and two different libraries to debug.

B) We require all MCULinks to be updated to CMSIS DAP v2 firmware. I didn't catch this issue initially because I had already done so. We have reliable instructions on how to do this https://github.com/oxidecomputer/meta/blob/master/engineering/mculink-upgrade.md , the downside is we will need to make sure this happens across our fleet of probes in the lab and manufacturing.

C) We use OxLink which comes with updated CMSIS-DAP firmware and works great.

I expect we will want some combination of B & C depending on how fast we can produce OxLinks . I am not a fan of A.

As far as I can tell this is a concern only for MCULinks not STLinks

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@labbott @sdonnan @mkeeter