16c95x Serial Port Driver Jun 2026

: Check the website of the card manufacturer (e.g., StarTech, SIIG, or Perle). For example, Perle provides standard Linux and Windows drivers for their multiport cards.

| Symptom | Likely Cause | Fix | |---------|--------------|-----| | Tx stops after first byte | THRE interrupt not re-enabled | Check start_tx() enables IER_THRI | | Rx overrun errors | Rx FIFO threshold too high | Lower TLR value or increase CPU responsiveness | | Spurious CTS/RTS changes | Auto flow control misconfigured | Verify EFR bits and MCR_AFE | | Baud rate off by factor 2 | Forgot DLAB=1 when setting divisor | Re-check initialization order | 16c95x serial port driver

About the author: [Your name] is an embedded systems engineer with over a decade of experience in low-level driver development and real-time communication protocols. : Check the website of the card manufacturer (e

Formula: Baud = (Clock_freq) / (16 * (DLL + DLM*256 + M/8)) where M is a 3-bit fractional value (0–7) stored in the FCTR register (FIFO Control Trigger). Formula: Baud = (Clock_freq) / (16 * (DLL

The driver functions by managing the advanced hardware features inherent to the 16C950 and 16C954 chips. Unlike standard 16550 UARTs, the 16C95x family offers significantly deeper buffers and faster data rates: Deep FIFOs