MDEV-868-PRC datasheet(23/55 Pages) LINX

23 / 55 page

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return dx;

}

/* Function: HumProRead

** Description: This function encodes a read command to the specified

unsigned char

/* number of encoded bytes, 3 to 4 */

HumProRead(

unsigned char *cmd,

/* out: encoded read command, length >= 4 */

unsigned char reg

/* register number to read, 0..0xff */

) {

unsigned char ra;

/* read register byte */

ra = reg ^ 0x80;

return HumProCommand(cmd, &ra, 1);

}

/* Function: HumProWrite

** Description: This function encodes a command to write a single byte to

a specified register address.

unsigned char

/* number of encoded bytes, 4 to 6 */

HumProWrite(

unsigned char *cmd,

/* out: encoded read command, length >= 6 */

unsigned char reg,

/* register number to write, 0..0xff */

unsigned char val

/* value byte, 0..0xff */

) {

unsigned char cs[2];

cs[0] = reg;

cs[1] = val;

return HumProCommand(cmd, &cs, 2);

}

Example Code for Encoding Read/Write Commands

This software example is provided as a courtesy in “as is” condition. Linx

Technologies makes no guarantee, representation, or warranty, whether

express, implied, or statutory, regarding the suitability of the software for

use in a specific application. The company shall not, in any circumstances,

be liable for special, incidental, or consequential damages, for any reason

whatsoever.

File EncodeProCmd.c

/* Sample C code for encoding Hum-fff-PRO commands

** 159 Ort Lane

** Merlin, OR, US 97532

** www.linxtechnologies.com

** License:

** Permission is granted to use and modify this code, without royalty, for

** any purpose, provided the copyright statement and license are included.

#include “EncodeProCmd.h”

/* Function: HumProCommand

** Description: This function encodes a command byte sequence.

If len = 1, a read command is generated.

If len > 1, a write command is generated.

rcmd[0] = register number

rcmd[1..(n-1)] = bytes to write

unsigned char

/* number of encoded bytes, n+2 to 2*n+2 */

HumProCommand(

unsigned char *ecmd,

/* out: encoded command, length >= 2*n + 2 */

const unsigned char *rcmd,

/* in: sequence of bytes to encode */

unsigned char n

/* number of bytes in rcmd, 1..32 */

) {

unsigned char dx;

/* destination index */

unsigned char sx;

/* source index */

unsigned char v;

/* value to be encoded */

dx = 2;

sx = 0;

while (n--) {

v = rcmd[sx++];

if (v >= 0xf0) {

ecmd[dx++] = 0xfe;

v &= 0x7f;

}

ecmd[dx++] = v;

}

ecmd[0] = 0xff;

ecmd[1] = dx - 2;

MDEV-868-PRC Datasheet(PDF) 23 Page - Linx Technologies

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