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prism-protocol-spec

Implement PRISM protocol frame parsing and CRC32 validation for K1 device communications.

15|1|Updated Oct 23, 2025
Search Tags:#communication#data integrity#protocol#CRC32#PRISM K1#frame format#embedded
One-click install
npx skills add https://github.com/synqing/K1.hardware --skill prism-protocol-spec
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: prism-protocol-spec
Source: https://github.com/synqing/K1.hardware/tree/main/.claude/skills/prism-protocol-spec
Command: npx skills add https://github.com/synqing/K1.hardware --skill prism-protocol-spec

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Designing reliable communication protocols for embedded devices can be complex, requiring careful attention to data integrity and framing. This Skill provides the complete PRISM protocol specification, a byte-oriented, CRC32-validated frame format, enabling developers to implement robust communication between the K1 device and control systems, ensuring data integrity and simplifying integration.

Core Features & Use Cases

  • CRC32 Data Integrity: Utilizes standard CRC32 checksums to detect transmission errors, ensuring reliable data exchange.
  • Fixed Header + Variable Payload: Defines a clear frame structure with sync markers, length, and payload for easy parsing and encoding.
  • Transport Agnostic: Designed to work seamlessly over various transport layers, including serial, WiFi, and WebSocket.
  • Use Case: Implement a custom client application to control the K1 device, debug communication issues by verifying frame integrity, or extend the K1 firmware with new commands using a standardized, robust protocol.

Quick Start

Example: Computing CRC32 for a frame

#include "esp32/rom/crc.h" uint32_t compute_crc32(uint8_t *data, uint16_t length) { return crc32_le(0, data, length); }

Verify frame CRC

uint8_t frame[8+N]; uint32_t computed_crc = crc32_le(0, frame, 4+N); # SYNC+LENGTH+PAYLOAD uint32_t received_crc = (frame[4+N]<<24) | ... ; # Extract CRC if (computed_crc != received_crc) { printf("CRC mismatch! "); return -1; # Frame error }

Frequently Asked Questions about prism-protocol-spec

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I implement frame parsing and CRC32 validation for embedded device communication?▼

Frame parsing involves reading sync markers (0xAA 0xBB), extracting the 2-byte big-endian LENGTH field, reading the variable payload (up to 65535 bytes), and validating the 4-byte big-endian CRC32 checksum. CRC32 validation computes the checksum over SYNC+LENGTH+PAYLOAD and compares it to the received value to detect transmission errors and ensure data integrity.

What frame format does the PRISM protocol use for K1 device communication?▼

PRISM protocol frames consist of 0xAA 0xBB sync markers, a 2-byte big-endian LENGTH field specifying payload size (0–65535 bytes), the variable-length payload, and a 4-byte big-endian CRC32 checksum. This fixed header plus variable payload structure enables reliable parsing and encoding across serial, WiFi, and WebSocket transports.

Can I use CRC32 checksums to detect transmission errors in frame communication?▼

Yes. CRC32 checksums detect transmission errors by computing a 32-bit value over the frame data (sync markers, length, payload) and comparing it to the received checksum. A mismatch signals corruption or transmission error, triggering frame rejection and enabling robust error handling without data loss.

How do I construct and encode outbound frames for the PRISM protocol?▼

Outbound frame construction writes sync markers (0xAA 0xBB), encodes the payload length as a 2-byte big-endian value, appends the payload data, computes CRC32 over all preceding bytes, and appends the 4-byte big-endian CRC32. This ensures the receiving system can validate frame integrity and parse the message correctly.

What boundary checks and error handling should I implement for frame reception?▼

Implement checks for sync marker alignment, validate that LENGTH does not exceed 65535 bytes, verify sufficient buffer space before reading payload, and reject frames with CRC32 mismatches. Graceful error handling prevents buffer overflows, infinite loops, and silent data corruption.

Does the PRISM protocol work with serial, WiFi, and WebSocket transports?▼

Yes. PRISM protocol is transport-agnostic; the byte-level frame format (sync markers, length, payload, CRC32) works across serial, WiFi, and WebSocket connections. Transport layer handles delivery; the protocol ensures end-to-end data integrity regardless of physical medium.

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