Lines Matching +full:serial +full:- +full:shift +full:- +full:bits

1 .\"-
2 .\" SPDX-License-Identifier: BSD-2-Clause
33 .Nd Universal Asynchronous Receiver/Transmitter serial driver
53 .Bl -tag -compact -width 0x000000
72 EIA RS-232C (CCITT V.24) serial communications interface.
77 The primary support for devices that contain multiple serial interfaces or
78 that contain other functionality besides one or more serial interfaces is
84 However, the serial interfaces of those devices that are managed by the
112 It contains the bus attachments and the low-level interrupt handler.
118 UARTs to be used for serial communications.
125 Likewise, when the kernel is configured for a serial console, the
134 This allows the UART to be used for terminals, modems and serial line IP
136 System devices, with the notable exception of serial consoles, generally
144 .Bl -bullet -compact
149 SCC: serial communications controllers supported by the
182 .Bl -tag -compact -offset "mmmm" -width "mmmm"
193 .Bl -tag -compact -offset "mmmm" -width "mmmm"
195 Invert the pulse (RS-232 logic low = ASSERT, high = CLEAR).
216 RFC 2783 defines an ASSERT event as a higher-voltage line level, and a CLEAR
217 event as a lower-voltage line level, in the context of the RS-232 protocol.
218 The modem control signals on a TTL-level connection are typically
219 inverted from the RS-232 levels.
220 For example, carrier presence is indicated by a high signal on an RS-232
223 TTL and RS-232 line levels in most hardware designs.
224 Generally speaking, a connection to a DB-9 style connector is an RS-232
226 A connection to header pins or an edge-connector on an embedded board
231 driver also supports an initial-state and a lock-state control
234 from those of the corresponding initial-state device
238 in the normal way on the initial-state devices to program
245 on the lock-state device.
247 may be locked by setting the corresponding value in the lock-state
251 on the initial-state device and
253 on the lock-state device.
278 .Bl -tag -width indent
283 .Bl -tag -width indent
286 Enable the so-called
289 For NS 16550-compatible devices, this will use heuristics to ensure that the
291 DesignWare-based UARTs need this due to a design flaw in the UART.
294 The data rate (bits per second) used for communications on the serial port.
304 driver to not program the baud rate divisor and use the hardware as-is.
310 Data bits.
315 .Bl -tag -width indent
328 Specifies the physical address of a memory-mapped UART.
340 Register shift.
341 Number of bits to shift left the base register offset.
358 .Bl -tag -width "/dev/ttyu?.init" -compact
363 corresponding callin initial-state and lock-state devices
369 corresponding callout initial-state and lock-state devices
374 When the kernel is using a serial console port, it should use