33991

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

32

SAMPLE CODE

/* The following example code demonstrates a typical set up configuration for a M68HC912B32. */

/* This code is intended for instructional use only. Motorola assumes no liability for use or */

/* modification of this code. It is the responsibility of the user to verify all parameters, variables,*/

/* timings, etc. */

void InitGauges(void)

{

/* Step 1 */

Command_Gauge(0x00,0x03);

/* Enable Gauges */

Command_Gauge(0x00,0x08);

/* Clock Cal bit set */

/* 8 uSec calibration */

PORTS = 0x00;

/* Enable GDIC CS pin - PORTS2 */

For (cnt = 0; cnt < 5; cnt++)

{

/* Wait for 8 uSec calibration */

NOP;

}

PORTS = 0x04;

/* Disable GDIC CS pin - PORTS2 */

/* Step 2 */

Command_Gauge(0xA0,0x21);

/* Send RTZCR values */

Command_Gauge(0x10,0x00);

/* Null Read to get SO status */

/*Check SO bits for Out of Range Clock Calibration */

If ((status & 0x80) != 0)

/*If Clock is out of range then recalibrate 8 uSec pulse */

/* Step 3 */

Command_Gauge(0x40,0x18);

/* Send position to gauge0 */

/* Step 4 */

Command_Gauge(0x60,0x18);

/* Send position to gauge1 */

/* Check SO bit ST4 to see if Gauge 0 has moved */

If((status & 0x10) != 0)

/* If ST4 is logic 1 then Gauge 0 has moved to the first microstep */

/* Step 5 */

Command_Gauge(0x10,0x00);

/* Null Read to get SO status */

/* Check SO bit ST4 to see if Gauge 0 has moved */

If((status & 0x10) != 0)

/* If it has moved, then keep track of position */

/* Wait until 24 steps are finished then send a RTZ command (Step 7) */

/* Step 6 */

Command_Gauge(0x80,0x02);

/* Send RTZ to Gauge 0 */

/* Step 7 */

Command_Gauge(0x10,0x00);

/* Null Read to get status */

/* Read Status until RTZ is done */

While ((status & 0x04) != 0)

{Command_Gauge(0x10,0x00);}

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