LP-EM-CC35X1 (CC3551E)

Quick facts

Get it running

First blink: 1 min from plug-in to a changed blink (terminal).

Every step, with the setup: the board's README.

What works

• CoreMark: 718.91 (4.49 per MHz) (TI Arm Clang, FreeRTOS, -O3; 160 MHz; 3 runs)
• Flash to Bluetooth advertising: 5 s
• Bluetooth connect and discover services: 0.52 s (terminal)
• Boot to joined network: 1 s (160 MHz)
• Board-to-board radio round trip: 16.951 ms (160 MHz)
• Radio command to state change, median: 120 ms (terminal; 160 MHz; 20 runs)
• RAM left after linking the radio stack: 74 kB (FreeRTOS; 160 MHz)
• Blink image size: 17.6 kB of flash, 36.9 kB of RAM (FreeRTOS)
• Room-occupancy AI model, one inference: 0.602 ms (-O3; 160 MHz; 2 runs)
• Fastest ADC with DMA: 0.170 Msps (160 MHz; 6 runs)

Download every result for this board (CSV), or compare it on this board on the Benchmarks page.

Projects and ports that ran here

• Blink an LED: 60.0 s from the terminal, board plugged in and tools installed
• Run a small AI model on the chip: 0.6 ms per answer, fastest build on this chip
• Measure how fast a chip runs: 719 CoreMark score at 160 MHz, timed by the 1 ms RTOS tick (this chip's cycle counter reads 0)
• Control a CC35X1 Matter light from Apple Home: TI’s lighting example paired with Apple Home on 2026-10-09; the phone tile and board buttons toggled the red LED
• Build and flash from the terminal: 60 s TI examples built
• Update a board's firmware over the air: Over Wi-Fi from a Mac: download about 1 s, install and reboot 8 s, new image running (one attempt)
• Asset tracking over Bluetooth: The hub: access point and site Wi-Fi together, extended scan, app and API; 283 of 283 events logged
• Doom on a TI board: All three shareware demos play to the end at 39.2 frames a second; the frame checksums equal the emulator's
• A DNS ad blocker on a Wi-Fi board: 71,492 blocked names answer 0.0.0.0 in a median 6 ms; forwarded names take a median 70 ms against 52 ms to the gateway directly
• DNS ad blocker (sinkhole) on the LP-EM-CC35X1 Works: The CC35X1 answers DNS on UDP port 53: names on a blocklist get 0.0.0.0 and the rest is forwarded to your gateway.
• Doom engine (doomgeneric and rp2040-doom's design) on the LP-EM-CC35X1 and the LP-MSPM33C321A Works: The rp2040-doom design plays all three shareware demos on the CC35X1 and the MSPM33 C321A, with frame checksums equal to a Cortex-M33 emulator.
• ESP32-BLE-Gamepad (a Bluetooth HID gamepad library) on TI, ST and C2000 boards Works: The ESP32-BLE-Gamepad descriptor and reports match the library's output byte for byte on four boards, and 15 of 15 button changes from the CC2340R5 reached a Mac as gamepad reports.
• ESPHome Wi-Fi device on the LP-EM-CC35X1 Works: A Wi-Fi ESPHome device runs on the CC35X1 with ESPHome's native API: a client on the board got 20 of 20 switch commands confirmed.
• Matter thermostat over Wi-Fi on the LP-EM-CC35X1 Works: A Matter thermostat and occupancy sensor runs on the CC35X1, pairs into Apple Home and takes setpoint changes from the phone.

Fixes

• If you see Path to programming_instructions after path correction couldn't be found, rebuild with an absolute build folder, or make the paths absolute.
• If you see Serial silent after programming over the Wi-Fi CSI program, even TI's own examples, run full_flash_erase (about 16 s), then program as usual.
• If you see Apple Home hangs on "Connecting", erase, program again, scan within 5 minutes.
• If you see Matter log turns into 0x00 and 0x80 bytes once Bluetooth starts, read the start-up log in the first seconds.
• If you see the CSI example never prints DAP streaming ready, wait for DAP inferencing ready, then send ED 08 00 9E.
• If you see OTA menu says Invalid input or Invalid choice, send only a carriage return after each answer.
• If you see OTA Show components in flash lists slot 2 as FAILED, menu 3, then the slot number (5 for the vendor image; about 20 s).
• If you see ERROR rxData_DataPacketDisptcher(): Received VLAN packet - drop it, ignore it.

Every fix for this board in its FAQ

For AI assistants

Point your assistant at this board's AGENTS.md (build, flash and fix notes) and the repository's llms.txt (the index).