Motorola MC68328 Informações Técnicas descarregar pdf (Página 32)

3-14 FLEX Alphanumeric Chip MC68175 Interface

Software Development

Porting FLEX One-Way Stack to the MC68328 MPU

Example 3-3 Function storeData

/************************************************************************

* FUNCTION NAME: storeData() *

* Date created: 07/26/96 *

* *

* DESCRIPTIONS: *

* This function stores packets of information in the circular *

* queue for later processing. These Packets are received *

* from the FLEXchip IC via the interrupt service routine *

* *

* INPUT: 32-bit of data in 2 16-bit variables *

* data1: First 16-bit data *

* data2:Second 16-bit data *

* OUTPUT: None *

* GLOBAL VARIABLES: *

* gPacketQ[]:Array used as a circular queue for *

* data storage *

* gPackWrite:index in the circular queue to keep *

* keep track of the next available storage *

* location in the queue. *

***********************************************************************/

void storeData(UVAR16 data1, UVAR16 data2)

{

volatile UCHAR *ptr;

/* Store the first word (16-bit data) in the queue */

ptr = (UCHAR*) &data1;

gPacketQ[gPackWrite++] = (UCHAR) *ptr++;

gPacketQ[gPackWrite++] = (UCHAR) *ptr;

/* Store the second word (16-bit data) in the queue */

ptr = (UCHAR*) &data2;

gPacketQ[gPackWrite++] = (UCHAR) *ptr++;

gPacketQ[gPackWrite++] = (UCHAR) *ptr;

/* If the index gPackWrite points to the end of the queue,

"circulate" it to the beginning of the queue */

gPackWrite &= (PAKQ_SIZE - 1);/* Assuming PAKQ_SIZE is 128 */

}

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Freescale Semiconductor, Inc.

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