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-rw-r--r--software/avr.lib/ds1820.c167
1 files changed, 0 insertions, 167 deletions
diff --git a/software/avr.lib/ds1820.c b/software/avr.lib/ds1820.c
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--- a/software/avr.lib/ds1820.c
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-/*
- * spreadspace avr utils - usb-1wire example
- *
- *
- * Copyright (C) 2013-2014 Bernhard Tittelbach <xro@realraum.at>
- * based on code from:
- * http://www.pjrc.com/teensy/td_libs_OneWire.html
- *
- * This file is part of spreadspace avr utils.
- *
- * spreadspace avr utils is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * any later version.
- *
- * spreadspace avr utils is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
- */
-
-
-#include "ds1820.h"
-#include "onewire.h"
-#include "util/delay.h"
-
-uint8_t owi_ds1820_addr_[MAX_OWI_DEVICES][8];
-uint8_t num_ds1820_found_;
-
-uint8_t ds1820_discover(void)
-{
- uint8_t d=0;
- num_ds1820_found_ = 0;
- if (! owi_reset()) //if no devices on bus, return now
- return 0;
- owi_reset_search();
- _delay_ms(250);
-
- //Search only for DS1820 temp sensors
- owi_target_search(DS1820_FAMILY_ID);
-
- while ( owi_search(owi_ds1820_addr_[ d ]))
- {
- d++;
- if ( d >= MAX_OWI_DEVICES)
- break;
- }
- num_ds1820_found_ = d;
- return num_ds1820_found_;
-}
-
-void ds1820_set_resolution(uint8_t d, uint8_t bits)
-{
- uint8_t resolution;
- if (d >= num_ds1820_found_ || bits < 9 || bits > 12)
- return;
-
- owi_reset();
- owi_select(owi_ds1820_addr_[d]);
-
- owi_write(DS1820_WRITE_SCRATCHPAD, 0);
- owi_write(0xFF, 0);
- owi_write(0x7F, 0);
-
- resolution = (bits - 9) << 5;
- owi_write(resolution | 0x1F, 0);
-}
-
-void ds1820_start_measuring(uint8_t d)
-{
- owi_reset();
- owi_select(owi_ds1820_addr_[d]);
- owi_write(DS1820_START_CONVERSION, 1);
-}
-
-uint16_t ds1820_get_conversion_time_ms(uint8_t bits)
-{
- switch (bits)
- {
- case 9: return DS1820_TCONV_MS_9BITS;
- case 10: return DS1820_TCONV_MS_10BITS;
- case 11: return DS1820_TCONV_MS_11BITS;
- default: return DS1820_TCONV_MS_12BITS;
- }
-}
-
-void ds1820_wait_conversion_time(uint8_t bits)
-{
- switch (bits)
- {
- case 9: _delay_ms(DS1820_TCONV_MS_9BITS); break;
- case 10: _delay_ms(DS1820_TCONV_MS_10BITS); break;
- case 11: _delay_ms(DS1820_TCONV_MS_11BITS); break;
- default: _delay_ms(DS1820_TCONV_MS_12BITS); break;
- }
-}
-
-int16_t ds1820_read_temperature(uint8_t d)
-{
- uint8_t data[9];
- int16_t raw = 0;
- uint8_t type_s=0;
- uint8_t cfg, i;
-
- owi_reset();
- owi_select(owi_ds1820_addr_[d]);
- owi_write(DS1820_READ_SCRATCHPAD, 0); // Read Scratchpad
- for (i = 0; i < 9; i++) { // we need 9 bytes
- data[i] = owi_read();
- }
- #if (ONEWIRE_CRC == 1)
- uint8_t crc_result = owi_crc8(data,8);
- if (crc_result != data[8])
- return DS1820_ERROR;
- #endif
-
- // the first ROM byte indicates which chip
- switch (owi_ds1820_addr_[d][0])
- {
- case 0x10:
- type_s = 1;
- break;
- case 0x28:
- case 0x22:
- type_s = 0;
- break;
- default:
- break;
- }
-
- // Convert the data to actual temperature
- // because the result is a 16 bit signed integer, it should
- // be stored to an "int16_t" type, which is always 16 bits
- // even when compiled on a 32 bit processor.
- raw = (data[1] << 8) | data[0];
- if (type_s)
- {
- raw = raw << 3; // 9 bit resolution default
- if (data[7] == 0x10) {
- // "count remain" gives full 12 bit resolution
- raw = (raw & 0xFFF0) + 12 - data[6];
- }
- } else {
- cfg = (data[4] & 0x60);
- // at lower res, the low bits are undefined, so let's zero them
- if (cfg == DS1820_RESOLUTION_9BITS)
- raw = raw & ~7; // 9 bit resolution, 93.75 ms
- else if (cfg == DS1820_RESOLUTION_10BITS)
- raw = raw & ~3; // 10 bit res, 187.5 ms
- else if (cfg == DS1820_RESOLUTION_11BITS)
- raw = raw & ~1; // 11 bit res, 375 ms
- //// default is 12 bit resolution, 750 ms conversion time
- }
-
- return raw;
-}
-
-float ds1820_raw_temp_to_celsius(int16_t t)
-{
- if ( t == DS1820_ERROR )
- return DS1820_ERROR;
- else
- return ((float) t) / 16.0;
-}