AN1816

21

Appendix 1 - Source Code

SpiBurst(2);

while ((RBytes[1] & 0x01) == 0)

{

SpiBurst(2);

}

}

/* This function programs the address into the first slave node (no response is

expected ) */

void PgmAddr(int Addr)

{

TFFlag(Addr);

/* Check TFNF0 flag is set */

TBytes[0] = 0x80;

/* send 80 (write cmd to DSI0H) receive

00 */

TBytes[1] = Addr;

/* Pgm Addr cmd into DSI0H then TBytes[2]

is DSI0L */

TBytes[2] = 0x00;

SpiBurst(3);

RFFlag();

}

/* This function programs the addresses into slave nodes 2 through to 15 and checks

the responses from slave nodes 1 to 14 */

void PgmChk(int Addr, int LastAddr)

{

unsigned short DsiDat;

unsigned short DsiChk;

int dummy=0;

TFFlag(Addr);

/* Check TFNF0 flag is set */

TBytes[0] = 0x80;

/* send 80 (write cmd to DSI0H) */

TBytes[1] = Addr;

/* Pgm Addr cmd written into DSI0H &

DSI0L */

TBytes[2] = 0x00;

SpiBurst(3);

RFFlag();

/* CRC Check */

if (RBytes[1] & 0x08) {

FlagError(4,LastAddr);

for (;;);

/* error - loop until device is reset */

}

TBytes[0] = 0x00;

/* Read DSI0H and DSI0L */

SpiBurst(3);

DsiDat = RBytes[1] | 0x0000;

/* Now shift DsiDat 8 times */

DsiDat <<= 8;

DsiDat = DsiDat+RBytes[2];

/* Now need to check the response ie that bits[15:12] = Prev.

Slave Addr */

DsiDat >>= 12;

DsiChk = LastAddr | 0x0000;

if (DsiDat != DsiChk) {

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