Comtrol eCos - Manual (Page 320)

Chapter 11. Porting Guide
IO channels
The calling interface provides procedure tables for all IO channels on the platform. These are used for console
(diagnostic) and debugger IO, allowing a ROM monitor to provided all the needed IO routines. At the same time,
this makes it easy to switch console/debugger channels at run-time (the old implementation had hardwired drivers
for console and debugger IO, preventing these to change at run-time).
The hal_if provides wrappers which interface these services to the eCos infrastructure diagnostics routines. This is
done in a way which ensures proper string mangling of the diagnostics output when required (e.g. O-packetization
when using a GDB compatible ROM monitor).
Available Procedures
This is a brief description of the procedures
CH_DATA
Pointer to the controller IO base (or a pointer to a per-device structure if more data than the IO base is
required). All the procedures below are called with this data item as the first argument.
WRITE
Writes the buffer to the device.
READ
Fills a buffer from the device.
PUTC
Write a character to the device.
GETC
Read a character from the device.
CONTROL
Device feature control. Second argument specifies function:
SETBAUD
Changes baud rate.
GETBAUD
Returns the current baud rate.
INSTALL_DBG_ISR
[Unused]
REMOVE_DBG_ISR
[Unused]
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