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lm75.c
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lm75.c
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/*
* Copyright (C) Josef Gajdusek <atx@atx.name>
*
* This program 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
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>
*/
#include "hal.h"
#include "lm75.h"
int lm75_get_temp(const struct lm75 *lm)
{
uint8_t rec[2];
i2cAcquireBus(lm->driver);
i2cStart(lm->driver, &lm->config);
i2cMasterTransmit(lm->driver, lm->addr, (uint8_t[]){0}, 1, NULL, 0);
i2cMasterReceive(lm->driver, lm->addr, rec, sizeof(rec));
i2cStop(lm->driver);
i2cReleaseBus(lm->driver);
return ((rec[0] << 3) | (rec[1] >> 5)) * 125;
}