AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE User's Guide download pdf (Page 133)

KwikNet System Construction

DAK

119

3.7.2 AMX Target Configuration

Each KwikNet device driver for AMX includes an Interrupt Service Procedure consisting

of two (sometimes three) parts. All drivers require an ISP root and an Interrupt Handler.

Some versions of AMX also require the driver to provide an ISP stem.

An ISP root is required for each device interrupt source which the KwikNet board driver

module KN_BOARD.C is configured to support. Unless modified by you, the board driver

supports four ISP roots with names of the form kn_isprootX() (X is A, B, C or D).

KwikNet dynamically assigns each network device to one of these ISP roots when the

network is initialized.

32-Bit AMX Systems

Each ISP root is serviced by a common Interrupt Handler kn_isphandler() located in

the KwikNet board driver module KN_BOARD.C. The handler is called with a single pointer

parameter which identifies the network device which generated the interrupt. Four

parameters with names of the form kn_ispparamX (X is A, B, C or D) are provided in the

board driver module, one for each of the four ISP roots with like names.

An ISP stem kn_ispstem() in the KwikNet board driver module KN_BOARD.C is provided

when required by AMX. The ISP stem also receives the device specific parameter

kn_ispparamX from the ISP root.

For all 32-bit implementations of AMX, the ISP must be described in the AMX Target

Configuration Module. You can use the AMX Configuration Builder, a Windows

utility, to edit the Target Parameter File to add ISP definitions.

There must be one ISP definition for each of the device interrupt sources which the

KwikNet board driver module KN_BOARD.C is configured to support. Each ISP definition

identifies the names of the ISP root, the ISP Handler and the ISP stem if applicable. Each

ISP definition also provides the appropriate pointer parameter kn_ispparamX. No

interrupt vector is included in the definition since each KwikNet device driver

automatically installs the pointer to its ISP root into the AMX Vector Table when

KwikNet

is initialized by the KwikNet Task.

See the KwikNet TCP/IP Sample Program Target Parameter File KNSAMTCF.UP for an

example of the definition of the four ISPs supported by the

KwikNet board driver module

KN_BOARD.C.

16-Bit AMX 86 Systems

AMX 86 does not utilize a Target Configuration Module. The KwikNet board driver

provided with AMX 86 creates an ISP root named

kn_isprootX() (X is A, B, C or D) for

each of the device interrupt sources which it is configured to support. Each ISP root

kn_isprootX() calls its Interrupt Handler kn_ispsrcX() which in turn calls procedure

kn_isphandler() with the device specific kn_ispparamX parameter. All of these

procedures are located in the board driver module KN_BOARD.C. Each KwikNet device

driver for AMX 86 automatically installs the pointer to one of these ISP roots into the

AMX Vector Table when

KwikNet is initialized by the KwikNet Task.

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