Why Does W5500 TCP “Send OK but No Data”? A Driver-Level Debugging Guide to TCP Socket Lifecycle
This article analyzes a common W5500 failure case where TCP connections succeed and SEND commands return OK, yet no data reaches the peer.
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Why Does W5500 TCP “Send OK but No Data”? A Driver-Level Debugging Guide to TCP Socket Lifecycle and SPI Discipline (W5500에서 TCP 전송은 성공인데 데이터가 없는 이유는 무엇일까? – 드라이버 수준 디버깅 가이드) Summary (40–60 words) This article analyzes a common W5500 failure case where TCP connections succeed and SEND commands return OK, yet no data reaches the peer. By walking through the real TCP socket lifecycle, SPI multi-byte access rules, and TX buffer handling, it explains why driver-level mistakes—especially CS timing—cause silent data loss, and how to fix them deterministically. 1. The Symptom: TCP Works… Except the…
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