int ds_search_rom(uint8_t *id, uint8_t mask)
{
uint8_t r, i, j;
uint8_t crc, b1, b2;
/* Reset the sensor(s) */
r = ds_reset();
if(r != DS_OK) return(r);
/* Transmit the SEARCH ROM command */
ds_write_byte(0xF0);
/* An ID is made up of 8 bytes (7 + CRC) */
for(crc = i = 0; i < 8; i++)
{
*id = 0;
for(j = 0; j < 8; j++)
{
/* Read the bit and its complement */
b1 = ds_read_bit();
b2 = ds_read_bit();
/* Both bits should never be 1 */
if(b1 && b2) return(DS_ERROR);
/* Both bits are 0 when two or more sensors
* respond with a different value */
if(b1 == b2)
{
b1 = mask & 1;
mask >>= 1;
/* Test if this is the last ID on the bus */
if(!b1) r = DS_MORE;
}
/* Let the sensors know which direction we're going */
ds_write_bit(b1);
*id >>= 1;
if(b1) *id |= 1 << 7;
}
/* Update the CRC, compare with last byte */
if(i != 7) crc = _crc_ibutton_update(crc, *id);
else if(crc != *id) return(DS_BADCRC);
id++;
}
/* Read a whole byte from the device.
*/
static unsigned int ds_read_byte (DALLAS_CONTEXT *dc)
{
int x;
unsigned int data;
data = 0;
for (x = 0; x < 8; x++) {
data |= ((ds_read_bit(dc) ? 1 : 0) << x);
}
return data;
} /* ds_read_byte */
static uint8_t ds_read_byte()
{
uint8_t i, b = 0;
for(i = 0; i < 8; i++)
{
b >>= 1;
if(ds_read_bit()) b |= 1 << 7;
}
return(b);
}
//*----------------------------------------------------------------------------
//* Name : ds_read_byte()
//* Brief : Read byte from bus
//* Argument : None
//* Return : 8 bits Data
//*----------------------------------------------------------------------------
static int ds_read_byte() {
int i = 0;
uint8 buf = 0;
for(i = 0; i < 8; i ++) {
buf >>= 1;
// LSB First
if(ds_read_bit()) {
buf |= 0x80;
}
}
return buf;
}
unsigned char ds_read_byte() {
unsigned char dsbyte,cnt = 0;
//cli();
do {
if (ds_read_bit()) {
dsbyte |= (1<<7);
} else {
dsbyte &= ~(1<<7);
}
if (cnt<7) {
dsbyte = dsbyte>>1;
}
cnt++;
} while (cnt<8);
