source: rtems/c/src/libchip/serial/README.ns16550 @ df49c60

4.104.114.84.95
Last change on this file since df49c60 was df49c60, checked in by Joel Sherrill <joel.sherrill@…>, on Jun 12, 2000 at 3:00:15 PM

Merged from 4.5.0-beta3a

  • Property mode set to 100644
File size: 1.7 KB
Line 
1#
2#  $Id$
3#
4
5Status
6======
7
8This driver appears to work OK for polled output at this point. 
9
10It needs to be tested for:
11
12  + polled input
13  + interrupt driver output
14  + interrupt driver input
15
16This driver does not support the new style RTEMS interrupt processing
17used on the i386 and some PowerPC models.
18
19Configuration Table Use
20=======================
21
22sDeviceName
23
24   The name of this device.
25
26deviceType
27
28   This field must be SERIAL_NS16550.
29
30pDeviceFns
31
32   The device interface control table.  This may be:
33      + ns16550_fns for interrupt driven IO
34      + ns16550_fns_polled for polled IO
35
36deviceProbe
37
38   This is the address of the routine which probes to see if the device
39   is present.
40
41pDeviceFlow
42
43   This field is ignored as hardware flow control is not currently supported.
44
45ulMargin
46
47    This is currently unused.
48
49ulHysteresis
50
51    This is currently unused.
52
53pDeviceParams
54
55    This is set to the default settings.  At this point, it is the default
56    baud rate cast as a (void *).
57
58ulCtrlPort1
59
60   This field is the base address of this port on the UART.
61
62ulCtrlPort2
63
64   This field is unused for the NS16550.
65
66ulDataPort
67
68   This field is the base address of this port on the UART.
69
70getRegister
71setRegister
72
73   These follow standard conventions.
74
75getData
76setData
77
78   These are unused since the TX and RX data registers can be accessed
79   as regular registers.
80
81ulClock
82
83   This is the clock constant which is divided by the desired baud
84   to get the value programmed into the part.  The formula for this
85   for 9600 baud is:
86
87      chip_divisor_value = ulClock / 9600.
88
89   NOTE: When ulClock is 0, the correct value for a PC (115,200) is
90   used.
91
92ulIntVector
93
94   This is the interrupt vector number associated with this chip.
95
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