AMX 68000 Manual de usuario descargar pdf (Pagina 23)

AMX 68000 Target Guide

DAK

The following examples illustrate how simple an Interrupt Handler can be.

/* The ISP root definition in the Target Parameter File is as follows:*/

/* ...ISPC deviceisp,deviceih,26,0,0 */

/* The ISP root is given the public name deviceisp */

/* The Interrupt Handler is named deviceih */

/* The device interrupts on vector number 26 (level 2) */

void CJ_CCPP deviceih(void)

{

local variables, if required

Clear the source of the interrupt request.

Perform all device service.

}

/* Assume dcbinfo is some application device control block structure. */

/* Assume deviceXdcb is a structure variable defined as */

/* "struct dcbinfo deviceXdcb;". */

/* */

/* The ISP root definition in the Target Parameter File is as follows:*/

/* ...ISPC dcb_isp,dcb_ih,30,deviceXdcb,1 */

/* The ISP root is given the public name dcb_isp */

/* The Interrupt Handler is named dcb_ih */

/* The device interrupts on vector number 30 (level 6) */

/* deviceXdcb is the name of the public structure variable which */

/* contains information about the specific device. */

void CJ_CCPP dcb_ih(struct dcbinfo *dcbp)

{

local variables, if required

Use device control block pointer dcbp to access structure variable

deviceXdcb to determine device addresses.

Clear the source of the interrupt request.

Perform all device service.

}

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AMX 68000 Manual de usuario Pagina 23