void w1_command(uint8_t command, uint8_t* id)
{
uint8_t i;
w1_reset();
if( id ){
w1_byte_wr( MATCH_ROM ); // to a single device
i = 8;
do{
w1_byte_wr( *id );
id++;
}while( --i );
}else{
w1_byte_wr( SKIP_ROM ); // to all devices
}
w1_byte_wr( command );
}
uint16_t read_meas(void)
{
uint8_t id[8], diff;
//uint8_t s[30];
uint8_t i;
uint16_t temp = 0;
for( diff = SEARCH_FIRST; diff != LAST_DEVICE; ){
diff = w1_rom_search( diff, id );
if( diff == PRESENCE_ERR ){
//uputsnl( "No Sensor found" );
break;
}
if( diff == DATA_ERR ){
//uputsnl( "Bus Error" );
break;
}
if( id[0] == 0x28 || id[0] == 0x10 ){ // temperature sensor
//uputs( "ID: " );
for( i = 0; i < 8; i++ ){
//sprintf( s, "%02X ", id[i] );
//uputs( s );
}
w1_byte_wr( READ ); // read command
temp = w1_byte_rd(); // low byte
temp |= (uint16_t)w1_byte_rd() << 8; // high byte
if( id[0] == 0x10 ) // 9 -> 12 bit
temp <<= 3;
//sprintf( s, " T: %04X = ", temp ); // hex value
//uputs( s );
//sprintf( s, "%4d.%01d¯C", temp >> 4, (temp << 12) / 6553 ); // 0.1¯C
//uputsnl( s );
}
}
//uputsnl( "" );
return (temp >> 4) * 100 + ((temp << 12) / 6553) * 10;
//return temp >> 4;
}
void read_meas( void )
{
uchar id[8], diff;
uchar s[30];
uchar i;
uint temp;
for( diff = SEARCH_FIRST; diff != LAST_DEVICE; )
{
diff = w1_rom_search( diff, id );
if( diff == PRESENCE_ERR )
{
uputsnl( "No Sensor found" );
break;
}
if( diff == DATA_ERR )
{
uputsnl( "Bus Error" );
break;
}
if( id[0] == 0x28 || id[0] == 0x10 ) // temperature sensor
{
uputs( "ID: " );
for( i = 0; i < 8; i++ ){
sprintf( s, "%02X ", id[i] );
uputs( s );
}
w1_byte_wr( READ ); // read command
temp = w1_byte_rd(); // low byte
temp |= (uint)w1_byte_rd() << 8; // high byte
if( id[0] == 0x10 ) // 9 -> 12 bit
temp <<= 3;
sprintf( s, " T: %04X = ", temp ); // hex value
uputs( s );
sprintf( s, "%4d.%01d�C", temp >> 4, (temp << 12) / 6553 ); // 0.1�C
uputsnl( s );
}
}
uint read_meas( void )
{
uchar id[8], diff;
uchar i;
uint temp;
for( diff = SEARCH_FIRST; diff != LAST_DEVICE; ) {
diff = w1_rom_search( diff, id );
if( diff == PRESENCE_ERR ) {
//printf( "No Sensor found" );
break;
}
if( diff == DATA_ERR ) {
//printf( "Bus Error" );
break;
}
if( id[0] == 0x28 || id[0] == 0x10 ) { // temperature sensor
//LCD_setpos(0,0);
for( i = 0; i < 8; i++ ) {
// printf("%02X", id[i] ); ID
}
w1_byte_wr( READ ); // read command
temp = w1_byte_rd(); // low byte
temp |= (uint)w1_byte_rd() << 8; // high byte
if( id[0] == 0x10 ) // 9 -> 12 bit
temp <<= 3;
//LCD_setpos(1,0);
return temp;
}
}
return 0;
}
uint8_t w1_rom_search(uint8_t diff, uint8_t* id)
{
uint8_t i, j, next_diff;
uint8_t b;
if( w1_reset() )
return PRESENCE_ERR; // error, no device found
w1_byte_wr( SEARCH_ROM ); // ROM search command
next_diff = LAST_DEVICE; // unchanged on last device
i = 8 * 8; // 8 bytes
do{
j = 8; // 8 bits
do{
b = w1_bit_io( 1 ); // read bit
if( w1_bit_io( 1 ) ){ // read complement bit
if( b ) // 11
return DATA_ERR; // data error
}else{
if( !b ){ // 00 = 2 devices
if( diff > i ||
((*id & 1) && diff != i) ){
b = 1; // now 1
next_diff = i; // next pass 0
}
}
}
w1_bit_io( b ); // write bit
*id >>= 1;
if( b ) // store bit
*id |= 0x80;
i--;
}while( --j );
id++; // next byte
}while( i );
return next_diff; // to continue search
}
uint8_t w1_byte_rd(void)
{
return w1_byte_wr( 0xFF );
}
