Cirrus Logic AN118 - Manual (Page 20)

AN118
20 AN118REV2
case 0xEE: /* System-Gain Cal on Setup 14 */
case 0xF6: /* System-Gain Cal on Setup 15 */
case 0xFE: /* System-Gain Cal on Setup 16 */
COMM = 0x00; /* Turn on LED */
if(mode == 1) P1 = 0xF4; /*Clear CSb*/
transfer_byte(command);
do {/* Nothing*/} while (SDO !=0);
/* Wait for cal to Complete */
if(mode == 1) P1 = 0xF5; /*Set CSb*/
COMM = 0x01; /* Turn off LED */
break;
/******************************/
/* Variable # of Normal Conversions */
/******************************/
case 0x1F:
COMM = 0x00; /* Turn on LED */
sample_index = RXSER(); /* How many Conversions? */
temp = RXSER(); /* What conversion channel? */
decode_sample_index();
/*Initiate Continuous Conversion*/
if(mode == 1) P1 = 0xF4;
/* Clear CSb */
transfer_byte(temp); /* Initiate Single conversion */
for (j=0; j<sample_size; j++) {
do { /* Nothing*/} while (SDO !=0); /* Wait for SDO to fall */
transfer_byte(0x00);
/* Send all zeros */
high_byte = receive_byte();/* Receive Bytes */
mid_byte = receive_byte();
low_byte = receive_byte();
TXSER(low_byte); /* Return bytes to PC */
TXSER(mid_byte);
TXSER(high_byte);
}
transfer_byte(0xFF);
/* Send all zeros */
high_byte = receive_byte(); /* Receive last conversion */
mid_byte = receive_byte();
low_byte = receive_byte();
if(mode == 1) P1 = 0xF5;
/* Set CSb */
COMM = 0x01; /* Turn off LED */
break;
/************************************/
/* Variable # of Offset or Gain Calibrations */
/************************************/
case 0x2F:
COMM = 0x00; /* Turn on LED */
sample_index = RXSER(); /* How many Cals? */
temp = RXSER(); /* What type of Cal? */