#define TEMPSENSE         0x90#define ACCESS_CONFIG     0xAC#define START_CONVERT     0xEE#define READ_TEMP         0xAAvoid ds1621_send0(unsigned char cmd){  i2c_start();  i2c_put(TEMPSENSE);  i2c_put(cmd);  i2c_stop();}void ds1621_send1(unsigned char cmd,unsigned char data){  i2c_start();  i2c_put(TEMPSENSE);  i2c_put(cmd);  i2c_put(data);  i2c_stop();}unsigned char ds1621_read1(unsigned char cmd){  unsigned char c;  i2c_start();  i2c_put(TEMPSENSE);  i2c_put(cmd);  i2c_rstart();  i2c_put(TEMPSENSE | 0x01);  c = i2c_get(1);  // NAK read  i2c_stop();  return(c);}void ds1621_read2(unsigned char cmd, unsigned char *ptr){  i2c_start();  i2c_put(TEMPSENSE);  i2c_put(cmd);  i2c_rstart();  i2c_put(TEMPSENSE | 0x01);  *(ptr+1) = i2c_get(0);  // get MSB, ack  *(ptr) = i2c_get(1);  // get LSB, nak  i2c_stop();}