65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* TMP75 is most simple I2C device in our case. It is already useful with
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* default settings after powerup.
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* You only must read 2 sequential bytes from it.
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*/
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#include <stdlib.h>
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#include "ch.h"
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#include "hal.h"
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#include "tmp75.h"
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/* input buffer */
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static uint8_t tmp75_rx_data[TMP75_RX_DEPTH];
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/* temperature value */
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static int16_t temperature = 0;
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static i2cflags_t errors = 0;
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#define tmp75_addr 0b1001000
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/* This is main function. */
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void request_temperature(void){
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int16_t t_int = 0, t_frac = 0;
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msg_t status = RDY_OK;
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systime_t tmo = MS2ST(4);
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i2cAcquireBus(&I2CD1);
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status = i2cMasterReceiveTimeout(&I2CD1, tmp75_addr, tmp75_rx_data, 2, tmo);
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i2cReleaseBus(&I2CD1);
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if (status != RDY_OK){
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errors = i2cGetErrors(&I2CD1);
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}
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t_int = tmp75_rx_data[0] * 100;
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t_frac = (tmp75_rx_data[1] * 100) >> 8;
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temperature = t_int + t_frac;
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}
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