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Arcom Embedded Linux Technical Manual Developing software for AEL

Using an Arcom PC/104 I/O board

AEL comes pre-installed with drivers for a selection of Arcom’s PC/104 I/O boards. The

following AIM104 peripheral boards are supported:

Board Module Device node

AIM104-RELAY8/IN8 aim104-relay.o /dev/arcom/aim104/relay8/{0..7}

AIM104-IN16 aim104-in16.o /dev/arcom/aim104/in16/{0..7}

AIM104-OUT16 aim104-out16.o /dev/arcom/aim104/out16/{0..7}

AIM104-IO32 aim104-io32.o /dev/arcom/aim104/io32/{0..7}

AIM104-MULTI-IO aim104.multi-io.o /dev/arcom/aim104/multi-io/{0..7}

Peripheral boards containing serial ports, such as the AIM104-COM4 and the

AIM104-COM8, are supported by the standard 16550 UART driver in the Linux

kernel. These boards can be configured using setserial, as described on page

The drivers are supplied as kernel modules that must be loaded to access the device.

Each module can support up to eight individual boards that are configured by passing a

list of I/O addresses using the io_base= module parameter. This is a comma-separated

list of addresses. For example, if you have two AIM104-RELAY8/IN8 boards with base

addresses configured as 0x180 and 0x184:

modprobe aim104-relay8 io_base=0x180,0x184

Some boards may require an offset to be added to the base address. Refer to

the board’s Quickstart Manual for details.

Once the kernel driver has been loaded then the libaim104 library can be used to

access the AIM104 boards. The library provides functions for each of the peripheral

boards. The functions are defined in the C header file arcom/libaim104.h.

Each function takes a file handle obtained by opening the device node listed in the

above table. All functions return 0 or a positive value on success, and a negative value

on failure. The possible libaim104 error codes are explained in the following table:

Error code Explanation

AIM104_SUCCESS = 0 Success. No error occurred.

AIM104_EBAD_CHANNEL = -10 The given channel is invalid.

AIM104_EIO = -20 Low-level I/O error. Check errno for details.

AIM104_ERANGE = -30 The given value was out of range.

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