LTC2483CDD datasheet(30/32 Pages) LINER

30 / 32 page

LTC2483

2483f

union

// adc_code.bits32

all 32 bits

{

// adc_code.by.te0

byte 0

signed int32 bits32;

// adc_code.by.te1

byte 1

struct fourbytes by;

// adc_code.by.te2

byte 2

} adc_code;

// adc_code.by.te3

byte 3

// Start communication with LTC2483:

i2c_start();

if(i2c_write(addr | READ))// If no acknowledge, return zero

{

i2c_stop();

return 0;

}

adc_code.by.te3 = i2c_read();

adc_code.by.te2 = i2c_read();

adc_code.by.te1 = i2c_read();

adc_code.by.te0 = 0;

i2c_stop();

return adc_code.bits32;

} // End of read_LTC2483()

/*** initialize() **************************************************************

Basic hardware initialization of controller and LCD, send Hello message to LCD

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

void initialize(void)

{

// General initialization stuff.

setup_adc_ports(NO_ANALOGS);

setup_adc(ADC_OFF);

setup_counters(RTCC_INTERNAL,RTCC_DIV_1);

setup_timer_1(T1_DISABLED);

setup_timer_2(T2_DISABLED,0,1);

// This is the important part - configuring the SPI port

setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_CLK_DIV_16|SPI_SS_DISABLED); // fast SPI clock

CKP = 0; // Set up clock edges - clock idles low, data changes on

CKE = 1; // falling edges, valid on rising edges.

lcd_init();

// Initialize LCD

delay_ms(6);

printf(lcd_putc, “Hello!”);

// Obligatory hello message

delay_ms(500);

// for half a second

} // End of initialize()

/*** main() ********************************************************************

Main program initializes microcontroller registers, then reads the LTC2483

repeatedly

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

void main()

{

signed int32 x;

// Integer result from LTC2481

float voltage;

// Variable for floating point math

int16 timeout;

initialize();

// Hardware initialization

while(1)

{

delay_ms(1);

// Pace the main loop to something more than 1 ms

// This is a basic error detection scheme. The LTC2483 will never take more than

// 149.9ms to complete a conversion in the 55Hz

// rejection mode.

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