16c95x — Serial Port Driver

static irqreturn_t xr16c950_interrupt(int irq, void *dev_id)

Many industrial applications require RS-485 half-duplex communication. The 16C95x includes an RS-485 configuration register. The driver must provide an ioctl (e.g., TIOCSRS485 ) to enable auto RTS direction control. 16c95x serial port driver

: The Rx FIFO may also trigger a timeout interrupt (when less than threshold bytes are pending for 4 character times). The driver must handle this by reading the remaining bytes. : The Rx FIFO may also trigger a

The 16C95x family (often referred to as 16C950 / 16C954 / related PCI UART-style devices) are multi-channel serial controller chips commonly found on industrial I/O cards and embedded platforms. This post explains the device features, driver architecture, key implementation details, common pitfalls, and a small reference implementation outline suitable for a Linux-like environment. The goal is practical: give an engineer what they need to write, port, or debug a driver for a 16C95x-based serial card. This post explains the device features, driver architecture,

To achieve maximum throughput (> 1 Mbps), follow these guidelines: