pyocd/pyOCD

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Open source Python library for programming and debugging Arm Cortex-M microcontrollers

Stars: 1.5k
Forks: 560
Open beginner issues: 0
Indexed issues: 308
Avg merge: 1h 41m
Merged PRs (30d): 3

Dominant language: Python
License: Apache-2.0
Last GitHub push: Jul 21, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

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308 open issues indexed

Reset and flashing etc. broken since v0.44.0 for ATSAM4L Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

pyocd/pyOCD#2031 · 3 comments · Opened Sep 18, 2026
Expose the ST-Link status code on the raised exception Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

pyocd/pyOCD#2026 · Opened Sep 5, 2026
FLM valEmpty ignored for sparse HEX holes Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

pyocd/pyOCD#2025 · Opened Sep 4, 2026
nrf54lm20a: flash algorithm faults (IPSR=3) and 'pyocd reset' is a no-op Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pyocd/pyOCD#2016 · Opened Jul 25, 2026
GDB z1 returns OK but FPB hardware breakpoint remains armed after disconnect Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pyocd/pyOCD#2014 · 1 comment · Opened Jul 24, 2026
pyOCD cannot install packs if the Arm Pack Index version is different from the version listed in the vendor's .pdsc file. Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pyocd/pyOCD#1992 · 3 comments · Opened Jun 26, 2026
pyocd load fails for nRF54L15 Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pyocd/pyOCD#1985 · 1 comment · Opened Jun 19, 2026
MSPM0L1105 No cores were discovered Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1975 · 4 comments · Opened Jun 2, 2026
pyocd load operation failing when smart flash is enabled. Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

pyocd/pyOCD#1964 · 4 comments · Opened Apr 23, 2026
RP2040: Flashing fails when device in ROM USB bootloader mode Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pyocd/pyOCD#1961 · Opened Apr 16, 2026
pyOCD flash (load) fails on STM32C031K4 (Custom Target) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pyocd/pyOCD#1956 · Opened Apr 10, 2026
Thread reporting can abort resume and stall gdbserver Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

pyocd/pyOCD#1935 · Opened Mar 25, 2026
Thread reporting behavior inconsistent Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

pyocd/pyOCD#1934 · Opened Mar 25, 2026
TransferFaultError during AP component scan aborts discovery on devices with secured APs Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pyocd/pyOCD#1921 · 2 comments · Opened Feb 28, 2026
Independent RTT and GDB server Open

Difficulty 5/5 Over a week Newbie friendliness 32/100

pyocd/pyOCD#1915 · 6 comments · Opened Feb 20, 2026
Invalid RAM address parsed from CMSIS pack for STM32U073 MCU Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pyocd/pyOCD#1896 · 1 comment · Opened Jan 13, 2026
pyocd not detect my jlink Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1895 · 2 comments · Opened Jan 13, 2026
gdb server command failing with "no attribute '_pack_file'" Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

pyocd/pyOCD#1894 · Opened Jan 12, 2026
pyOCD failed when a RTOS thread exited. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1893 · Opened Jan 8, 2026
CMSIS-DAP V1 Issue on Linux Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pyocd/pyOCD#1892 · 7 comments · 1 reaction · Opened Jan 7, 2026
Cannot flash S32K344 with MCU-Link or J-Link Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

pyocd/pyOCD#1891 · 2 comments · Opened Jan 6, 2026
Probe not found Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1888 · 1 comment · Opened Dec 23, 2025
SVD File XML Header Parsing Issue in GD32F30x Pack Causes pyocd Board Detection Failure Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pyocd/pyOCD#1887 · 1 comment · Opened Dec 22, 2025
UnicodeDecodeError ('gbk' codec) when running pyocd flash on Windows Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1883 · Opened Dec 18, 2025
DAP_PACKET_SIZE >= 256 not fully used Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pyocd/pyOCD#1872 · Opened Dec 12, 2025
Kept getting flash algorithm overflow when using the MAX32625PICO to program MAX32666 Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

pyocd/pyOCD#1870 · 1 reaction · Opened Dec 11, 2025
Request: Add Target Support for NXP FRDM-KW38A4 Board Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1860 · Opened Nov 26, 2025
Flashing an LPC802 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1826 · 3 comments · Opened Oct 14, 2025
Proper detach after exiting commander Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pyocd/pyOCD#1807 · Opened Aug 29, 2025
GDB connect to a running target without halting cores. Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pyocd/pyOCD#1802 · Opened Aug 24, 2025
Timeout reading from probe attempting to program LPC54628 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pyocd/pyOCD#1798 · Opened Aug 2, 2025
PDSC `/package/devices/family/.../debug` parsing logic dropping common attributes Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pyocd/pyOCD#1796 · Opened Jul 27, 2025
[cli] pyocd commander -W -u 12345: return code always is 0 Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

pyocd/pyOCD#1794 · Opened Jul 25, 2025
Session Option is invalid when using reset/flash command Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pyocd/pyOCD#1789 · 2 comments · Opened Jul 20, 2025
pyOCD: Integration with CMSIS-Toolbox replaces over time built-in pack management Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pyocd/pyOCD#1787 · Opened Jul 15, 2025
Pyocd: Pack: Updating: `Downloading descriptors` takes long time. Open

pyocd/pyOCD#1783 · 14 comments · 7 reactions · 1 assignee · Opened Jun 3, 2025
Error when trying to use the STLINK-V3PWR probe Open

pyocd/pyOCD#1781 · 2 comments · 1 assignee · Opened May 23, 2025
0000621 C Error: 'str' object cannot be interpreted as an integer [__main__] Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pyocd/pyOCD#1778 · Opened May 18, 2025
Flashing LPC5536 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1776 · 1 comment · Opened May 8, 2025
tcp_client sends non-conformant JSON Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pyocd/pyOCD#1769 · 1 comment · Opened May 6, 2025
Error: 'NoneType' object is not iterable [__main__] Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

pyocd/pyOCD#1768 · Opened May 6, 2025
False "nRF9160_xxAA APPROTECT enabled" causes settings lose by mass erase Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1766 · 8 comments · Opened Apr 9, 2025
Installation on macOS (M1) fails Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1763 · 2 comments · Opened Mar 1, 2025
rp2350 pc_EraseAll is wrong in target_rp2.py on develop Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

pyocd/pyOCD#1762 · 2 comments · Opened Feb 25, 2025
rp2350 with 0.36.1.dev15 - Error creating root component at address 0x00007000: Memory transfer fault Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1760 · 1 comment · Opened Feb 22, 2025
when used as Cortex-Debug gdbserver, program cannot stop at breakpoint if there isn't FlashRegion in memory map definition. Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

pyocd/pyOCD#1756 · Opened Jan 24, 2025
Most ST MCUs are missing - what is going on? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pyocd/pyOCD#1751 · 2 comments · Opened Jan 13, 2025
RTT: CTRL-C triggers "Error during board uninit" Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pyocd/pyOCD#1750 · Opened Dec 19, 2024
RTT: Crash with `'utf-8' codec can't decode byte` when arrow key is pressed Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pyocd/pyOCD#1749 · 1 comment · Opened Dec 19, 2024
Attempting to connect to jlink with a JTAG frequency specified in 'options' does not honor the specified frequency, subsequently resulting in inability to connect to targets with limited JTAG frequency Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

pyocd/pyOCD#1745 · Opened Nov 29, 2024

pyocd/pyOCD

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