ATmega128 - DS1620 디지털 온도계 동작 소스.

#define dir_pin DDRB

#define out_pin PORTB

#define in_pin PINB

#define dq_out_set (dir_pin=0xff)

#define dq_in_set (dir_pin=0xfe)

#define clk_conv_low (out_pin&=0xfd)

#define clk_conv_high (out_pin|=0x02)

#define reset_low (out_pin&=0xfb)

#define reset_high (out_pin|=0x04)

#define ds1620_comm_read_temp (0xaa)

#define ds1620_comm_write_th (0x01)

#define ds1620_comm_write_tl (0x02)

#define ds1620_comm_read_th (0xa1)

#define ds1620_comm_read_tl (0xa2)

#define ds1620_comm_read_cnt (0xa0)

#define ds1620_comm_read_slope (0xa9)

#define ds1620_comm_start_conv_t (0xee)

#define ds1620_comm_stop_conv_t (0x22)

#define ds1620_comm_write_config (0x0c)

#define ds1620_comm_read_config (0xac)

#define decimal_temp(x) (signed char)(x>>1)

#define point_temp(x) (x&0x01)

unsigned int temperature;

unsigned char temperature_temp[16]={0};

void ds1620_write_protocol(unsigned char protocol){

 unsigned char i;

 dq_out_set; reset_high;

 for(i=0;i<8;i++){

  clk_conv_low;

  _delay_us(1);

  if(protocol&(1<<i)) out_pin|=0x01;

  else out_pin&=0xfe;

  _delay_us(1);

  clk_conv_high;

 } reset_low;

}

void ds1620_write_8bit(unsigned char protocol,unsigned char data){

 unsigned char i;

 dq_out_set; reset_high;

 for(i=0;i<8;i++){

  clk_conv_low;

  _delay_us(1);

  if(protocol&(1<<i)) out_pin|=0x01;

  else out_pin&=0xfe;

  _delay_us(1);

  clk_conv_high;

 }

 for(i=0;i<8;i++){

  clk_conv_low;

  _delay_us(1);

  if(data&(1<<i)) out_pin|=0x01;

  else out_pin&=0xfe;

  _delay_us(1);

  clk_conv_high;

 } reset_low;

}

void ds1620_write_16bit(unsigned char protocol,unsigned int data){

 unsigned char i;

 dq_out_set; reset_high;

 for(i=0;i<8;i++){

  clk_conv_low;

  _delay_us(1);

  if(protocol&(1<<i)) out_pin|=0x01;

  else out_pin&=0xfe;

  _delay_us(1);

  clk_conv_high;

 }

 for(i=0;i<16;i++){

  clk_conv_low;

  _delay_us(1);

  if(data&(1<<i)) out_pin|=0x01;

  else out_pin&=0xfe;

  _delay_us(1);

  clk_conv_high;

 } reset_low;

}

unsigned char ds1620_read_8bit(unsigned char protocol){

 unsigned char data=0;

 unsigned char i;

 dq_out_set; reset_high;

 for(i=0;i<8;i++){

  clk_conv_low;

  _delay_us(1);

  if(protocol&(1<<i)) out_pin|=0x01;

  else out_pin&=0xfe;

  _delay_us(1);

  clk_conv_high;

 } dq_in_set;

 for(i=0;i<8;i++){

  clk_conv_low;

  _delay_us(1);

  if(in_pin) data|=(1<<i);

  _delay_us(1);

  clk_conv_high;

 } reset_low; dq_out_set; return data;

}

unsigned int ds1620_read_16bit(unsigned char protocol){

 unsigned int data=0;

 unsigned char i;

 dq_out_set; reset_high;

 for(i=0;i<8;i++){

  clk_conv_low;

  _delay_us(1);

  if(protocol&(1<<i)) out_pin|=0x01;

  else out_pin&=0xfe;

  _delay_us(1);

  clk_conv_high;

 } dq_in_set;

 for(i=0;i<16;i++){

  clk_conv_low;

  _delay_us(1);

  if(in_pin&0x01) data|=(1<<i);

  _delay_us(1);

  clk_conv_high;

 } reset_low; dq_out_set; return data;

}

unsigned int get_temperature(void){

  ds1620_read_16bit(ds1620_comm_read_temp);

}

void ds1620_init(void){

 dir_pin=0xff; reset_low; clk_conv_high; out_pin|=0x01;

}

void ds1620_setup(void){

 ds1620_write_8bit(ds1620_comm_write_config,0x00);

 ds1620_write_protocol(ds1620_comm_start_conv_t);

}