🚀 My website showcasing my professional achievements
Embedded Systems, Zephyr RTOS, Physical AI & Robotics Architect
Former Zephyr RTOS Engineer at Intel (@maksimmasalski) · Top 5% Nordic Semiconductor Contributor on Hackster.io · Active open-source hardware performance hunter (@maxxlife).
-0066CC?style=for-the-badge&logo=hackster&logoColor=white){kind=icon}
- Core Focus: Real-Time Operating Systems (Zephyr RTOS), Arm Cortex-M / DSP & NPU low-level optimization (CMSIS-NN, bare-metal workloads), Physical AI, and Autonomous Mobile Robotics (ROS 2 / AMR).
- Engineering Approach: Every optimization and bug report is backed by real silicon measurements (
DWT->CYCCNT),objdumpinstruction/register analysis, and exhaustive bit-exact verification suites.
1. ARM-software/CMSIS-NN — 1.385×–1.408× INT4 (s4) Speedup on Cortex-M33
- Upstream PR (Merged): ARM-software/CMSIS-NN#250 — Optimize
read_and_pad_s4unpacking on DSP targets · Merged Commit:7b515b9 - Benchmark & Reproducer Repo: maxxlife/cmsis-nn-s4-cortex-m33-benchmark
- Technical Summary:
- Identified that
arm_nn_read_s8x2()copied 2 bytes into an uninitialized 32-bitint32_t, causing GCC 14 (-Ofast) to emitBFIinstructions that locked callee-saved registers across loop iterations and forced stack spills inarm_nn_vec_mat_mult_t_s4(). - Proved that the
0x00FF/0xFF00masks inread_and_pad_s4()are architecturally redundant beforeSXTB16, collapsing a 5-instruction sequence into a singleorr.w Rd, Rn, Rn, lsl #8. - Result on Nordic nRF54LM20B (Cortex-M33 @ 128 MHz): Reduced hot-loop instructions from 78 to 51 (0
BFI, 0 stack accesses), achieving a 1.385× speedup (−27.8% CPU cycles) from a 3-line helper change and 1.408× (−28.9% cycles) with a spill-free 4-row loop, verified bit-exact across all65,53616-bit inputs and1,152matrix test cases.
- Identified that
⚡ Hardware & Edge AI Deep-Dives on Hackster.io/maxxlife
🏅 Recognitions: Top 5% Contributor in Nordic Semiconductor, Automotive, and Vehicles · Top 10% Contributor in Robotics and Arduino (63,000+ project views).
| Featured Project | Platform & Stack | Highlights |
|---|---|---|
| nRF54LM20B Axon NPU Benchmark on Zephyr | Nordic nRF54L, Axon NPU, Zephyr RTOS | Bypassing TFLM to compile bare-metal NPU workloads and benchmark silicon limits on Zephyr. |
| Build a SoftSIM Architecture Prototype on nRF9151 | Nordic nRF9151, Zephyr RTOS Shell | Compact SoftSIM transport and provisioning prototype built on Zephyr RTOS. |
| Cellular HTTP Server LED Control with Protobuf | nRF9151, Zephyr RTOS, LTE-M, Protobuf, Onomondo | Turning the nRF9151 into a cellular HTTP server with compact Protobuf payloads (18.3k+ views). |
| Commercial-Grade Cellular IoT on nRF9151 | nRF9151, Zephyr RTOS, Onomondo / Conexa SIM | Enterprise cellular connectivity series on Zephyr RTOS (34.6k+ combined views). |
| Taming the micro:bit v2 Audio with Zephyr RTOS | BBC micro:bit v2 (nRF52833), Zephyr ADC | Custom low-level ADC sampling and real-time audio visualization on Zephyr RTOS. |
| CodeWheels & LEGO® Super Mario™ Robotics | Autonomous Mobile Robots, BLE, Embedded Control | Self-driving robot racing platform (CodeWheels) and interactive robotic vehicles. |
(Authored during my time on the Zephyr RTOS team at Intel under @maksimmasalski / maksim.masalski@intel.com):
| Commit | Description | Date |
|---|---|---|
843ea97eac4 |
doc: add parasoft tool section to the coding guidelines page | 2021-07-13 |
0343118abba |
thread: set mxcsr bit 6 DAZ to zero to disable denormals-are-zeros | 2021-09-22 |
164029b0c5b |
testsuite: suppress usage of setjmp in a testcode (rule 21_4-a) | 2021-07-07 |
fa97ed27719 |
docs: getting started guide 3rd party toolchains fixes | 2021-06-25 |
e02c7bd4663 |
libc: types: suppress deviation | 2021-07-07 |
8ed9cddbc57 |
lib: add explanation comment in "work->handler" case | 2021-07-07 |
52a4ba26ced |
lib: os: cast to the same size composite expression | 2021-06-10 |
89212a7fbf5 |
doc: fix image resolution of the ITE IT8XXX2 series board | 2021-06-24 |
c68054c9e51 |
include: sys: cast to the same size composite expression | 2021-06-10 |
8535a01d925 |
libc: types: add a comment to the "wrong definition" code | 2021-06-21 |
466c5d9dea1 |
arch: x86: core: remove order eval of 'z_x86_check_stack_bounds' args | 2021-05-12 |
ab3a207baf8 |
testsuite: suppress usage of setjmp in a testcode | 2021-06-21 |
cbfd33f2ec2 |
arch: add comments to empty default case, add default LOG_ERR | 2021-06-03 |
e96df400045 |
arch: x86: cast to the same size composite expression | 2021-06-09 |
9eab89ff204 |
lib: replace one case switch with if operator | 2021-05-18 |
a61edd480d3 |
lib: add default labels and comments to switch statements | 2021-06-03 |
e9600a75fc1 |
kernel: thread: add default case, remove unused break | 2021-06-02 |
3960d413db7 |
lib: os: add braces to 'if' statements | 2021-06-02 |
78ba2ec8300 |
coding guidelines: add to function prototypes form named parameters | 2021-06-01 |
366de7a8904 |
logging: z_vrfy_log_filter_set: remove extra check | 2021-06-01 |
9867ac2a405 |
posix: pthread_exit: check for null before dereferencing | 2021-05-26 |
7711435347b |
lib: remove redundant check for null | 2021-05-26 |
970820e92d1 |
sched: create unique function name | 2021-05-25 |
f18b728a4cd |
heap: create unique variable name | 2021-05-25 |
d6c9d40ee06 |
userspace: remove dead code | 2021-05-24 |
0f5aab11822 |
drivers: change suffix ull to ULL | 2021-05-20 |
5a9e9e8fd15 |
logging: remove dead code enum | 2021-05-20 |
929956df70d |
coding guidelines rule 14_3_j: add explicit case check | 2021-05-17 |
dbfa5a04dec |
coding guidelines 11.9: fix literal zero as the null-ptr-constant | 2021-05-08 |
136c9424c5e |
coding guidelines 10.4: casting operands to have same types | 2021-04-30 |
0b6539c3458 |
doc: fix display of the ISR_DIRECT_DECLARE example usage | 2021-05-07 |
2c138fb59fa |
tests: add new kernel objects tests | 2020-10-21 |
555408d4e75 |
tests: access kernel object with private data using system call | 2020-11-06 |
80123899c1e |
tests: add test to verify assertion cathes overlapped partitions | 2020-11-13 |
c7a5c406b76 |
doc: timing docs fix misprint | 2020-11-20 |
b2bd0a06080 |
samples: add capture output for the mec15xxevb_assy6853 pm sample | 2020-11-06 |
56c02e535d1 |
samples: change name for the mec15xxevb_assy6853 pm sample | 2020-10-21 |
da3e834d586 |
lib: posix: unchecked return value while taking semaphore | 2020-09-18 |
a4f1a5f58f6 |
tests: add new kernel objects tests | 2020-05-27 |
3ce7afdaaa0 |
tests: sched_api remove misprints and etc | 2020-10-15 |
9eddc69029e |
tests: added new tests for memory partitions | 2020-04-17 |
2cd556a689e |
tests: arch: x86 mem protection check CPU scrubs regs after syscall | 2020-09-05 |
cd068c26dca |
doc: replace the latest sdk with 0.11.4 version | 2020-09-18 |
f08f9d6410a |
samples: exclude mec15xxevb_assy6853 in espi sample when sanitycheck | 2020-09-16 |
d7468bf836b |
samples: Add fixtures for samples interacting with keyboard and mouse | 2020-09-08 |
fd155249124 |
tests: arch: arm mem protection check CPU scrubs regs after syscall | 2020-08-29 |
124b55a73d5 |
doc: fix incorectness in multiple overlay files description | 2020-08-14 |
435b9a1e4ba |
tests: memory protection thread stack exit uninit | 2020-05-18 |
e9ffd9574da |
tests: copyright message add year to the existing | 2020-07-02 |
d70ee1eda73 |
tests: copyright message add year to the existing | 2020-07-02 |
d735e971f65 |
tests: mem protection tests updated tags | 2020-05-15 |
39fe4ef51a2 |
tests: semaphore tests overhaul | 2020-05-26 |
d18ffc9307c |
tests: add new threads permissions tests, modify existing | 2020-05-28 |
4f35917d1bd |
tests: add check return value in futex_wake() | 2020-07-28 |
9ccbfbd84e4 |
tests: code review changes | 2020-07-14 |
32aa91d8034 |
tests: add new futex test | 2020-05-26 |
c9a9aacb3f2 |
tests: update kernel objects tests | 2020-07-15 |
a3621cecd54 |
tests: copyright message add year to the existing | 2020-07-02 |
2893aa0bc11 |
tests: mem protection new test inherit resource pool | 2020-05-15 |
819197fba05 |
tests: add new semaphore tests | 2020-05-26 |
2053814d7cd |
tests: make code style changes according with review comments | 2020-07-09 |
6eabee26810 |
tests: rebase with 2.3 release changes | 2020-06-24 |
416feaab0c4 |
tests: resolve shippable errors | 2020-05-12 |
7808a784176 |
tests: workqueue tests overhaul adding new tests | 2020-02-21 |
223723e8a9b |
tests: mem protect syscalls update Doxygen tags, fix API, misprints | 2020-05-14 |
f221dfec2fc |
tests: added new doxygen tags for memory protection tests | 2020-05-21 |
f25406af99e |
tests: add new Doxygen tags to threads tests | 2020-05-28 |
6a805dff9f3 |
tests: fix text output in timing_info test | 2020-06-05 |
82855aa4e06 |
tests: update doxygen tags for syscalls tests | 2020-05-28 |
c25262c8292 |
tests: remove duplicate names for tests | 2020-02-13 |
e31199a3d42 |
docs: mec15xxevb assy6853 updated sequence events | 2020-01-07 |
12e72953071 |
docs: error in mec15xxevb assy6853 in set up manual | 2020-01-17 |
33336e78f62 |
drivers: spi: Support PM busy state where relevant in DW | 2019-12-25 |
de345e2a63a |
docs: mec15xxevb assy6853 updated set up manual | 2019-12-20 |
b7f07dcff78 |
docs: mec15xxevb assy6853 updated set up manual | 2019-12-13 |
1b4b9ef5352 |
sanitycheck: hardware map added support of the microchip board | 2019-12-18 |
e8beacdfad6 |
tests: remove duplicate name for the kernel arch.interrupt test | 2019-11-12 |
fe1ff2f2150 |
include: kernel readme misprint fix | 2019-10-29 |
21d866e3e99 |
tests: remove duplicate names for the peripheral tests | 2019-10-24 |
464c795949f |
tests: remove duplicate names for the filesystem tests | 2019-10-24 |
11d6385ebe8 |
tests: remove duplicate names for the net tests | 2019-10-24 |
432bb69babb |
tests: remove duplicate names for the boards tests | 2019-10-24 |
e9d7565d663 |
tests: remove duplicate names for the bluetooth tests | 2019-10-24 |
b2bf7e76d04 |
tests: remove duplicate names for the libraries tests | 2019-10-24 |
6882d975316 |
tests: new updated names for the kernel tests | 2019-10-24 |
2c5be79e25c |
tests: remove duplicate names for the shell tests | 2019-10-24 |
813ef68554a |
tests: updated names for the tests | 2019-10-22 |
d85b45b072d |
tests: updated names for the arch interrupt tests | 2019-10-22 |
11faaacd1e2 |
tests/posix/common: Fix miscalibrated timing test | 2019-10-23 |
9f26f7d3d40 |
tests: updated names for the kernel tests | 2019-10-22 |
03e6d3bb41d |
tests: updated names for the dns tests | 2019-10-18 |
9901d8cf4bc |
samples: sample modified according to the changes in Zephyr macros | 2019-05-30 |
a58a852e80d |
drivers: added break in function stm32_clock_control_get_subsys_rate | 2019-05-02 |
f1f1a9f38af |
tests: fix unchecked return value in test_net_pkt_basics_of_rw | 2019-05-07 |
888f4dd0963 |
samples: LSM6DSL accel fix unchecked return value sensor_trigger_set() | 2019-04-29 |
d1f3bba7052 |
can: fix unchecked return from clock_control_get_rate | 2019-03-04 |
eead071b184 |
bluetooth: fix unchecked return from lll_clk_off in ll_test_end | 2019-03-03 |
b324f35e617 |
macros: deleted macros SECONDS(), MSEC(), USEC() | 2019-02-27 |
039d8ecf6a8 |
drivers: Changed return statement in function get_timeout() | 2019-02-21 |
9f8db3d7299 |
can: cast value 1U to type ULL in function can_stm32_set_filter | 2019-02-28 |
f32b94c46ef |
can: cast value 1U to type u64_t in function can_stm32_set_filter | 2019-02-28 |
a4c0810aa01 |
shell: changed dead code part in function buffer_trim() | 2019-02-24 |
- RTOS & Firmware: Zephyr RTOS, nRF Connect SDK (nRF54L / nRF9151 / nRF52 / nRF53), FreeRTOS, Bare-Metal Armv7E-M / Armv8-M (Cortex-M4 / Cortex-M33)
- Edge AI, NPU & DSP: Arm CMSIS-NN, Nordic Axon NPU, TensorFlow Lite Micro (TFLM), INT4/INT8 Quantization, SIMD/DSP Intrinsics (
SXTB16,SMLAD), Automated LLM-Assisted Hardware Profiling - Robotics & Engineering: ROS / ROS 2 (
slam_toolbox), AMR Navigation, C/C++, Python, 3D CAD (SolidWorks / Onshape), TRIZ