$ cat writeup.md…
$ cat writeup.md…
CACTF2026
Task: a sigrok/PulseView logic-analyzer capture (capture.sr) of an embedded device. Solution: identify the two active channels as I2C SCL/SDA, decode with sigrok-cli, recognize the SSD1306 OLED init at address 0x3C, split control bytes (0x00 command / 0x40 data), collect 3 GDDRAM frames and render the 128x64 page-addressed framebuffers to recover the flag drawn on the OLED.
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