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95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/*
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* Copyright (C) 2017 Koen Zandberg
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_jc42
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* @{
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*
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* @file
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* @brief Device driver implementation for the JEDEC jc42.4 compliant temperature sensors
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*
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* @author Koen Zandberg <koen@bergzand.net>
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*
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* @}
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*/
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#include "periph/i2c.h"
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#include "byteorder.h"
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#include "jc42.h"
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#include "jc42_internal.h"
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#define ENABLE_DEBUG 0
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#include "debug.h"
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static int jc42_get_register(const jc42_t* dev, uint8_t reg, uint16_t* data)
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{
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i2c_acquire(dev->i2c);
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if (i2c_read_regs(dev->i2c, dev->addr, reg, data, 2, 0) != 0) {
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DEBUG("[jc42] Problem reading register 0x%x\n", reg);
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i2c_release(dev->i2c);
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return JC42_NODEV;
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}
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i2c_release(dev->i2c);
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return JC42_OK;
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}
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static int jc42_set_register(const jc42_t* dev, uint8_t reg, uint16_t* data)
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{
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i2c_acquire(dev->i2c);
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if (i2c_write_regs(dev->i2c, dev->addr, reg, data, 2, 0) != 0) {
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DEBUG("[jc42] Problem writing to register 0x%x\n", reg);
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i2c_release(dev->i2c);
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return JC42_NODEV;
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}
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i2c_release(dev->i2c);
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return JC42_OK;
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}
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int jc42_get_config(const jc42_t* dev, uint16_t* data)
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{
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return jc42_get_register(dev, JC42_REG_CONFIG, data);
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}
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int jc42_set_config(const jc42_t* dev, uint16_t data)
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{
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return jc42_set_register(dev, JC42_REG_CONFIG, &data);
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}
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int jc42_get_temperature(const jc42_t* dev, int16_t* temperature)
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{
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struct { signed int x:12;} s;
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uint16_t tmp;
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/* Read temperature */
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if (jc42_get_register(dev, JC42_REG_TEMP, &tmp) != 0) {
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return JC42_NODEV;
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}
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tmp = ntohs(tmp);
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/* Convert fixed point to uint16_t */
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*temperature = ((s.x = tmp)*100)>>4;
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return JC42_OK;
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}
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int jc42_init(jc42_t* dev, const jc42_params_t* params)
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{
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uint16_t config;
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dev->i2c = params->i2c;
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dev->addr = params->addr;
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/* Poll the device, fail if unavailable */
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if (jc42_get_config(dev, &config) != 0) {
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return JC42_NODEV;
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}
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DEBUG("[jc42] Config: 0x%x\n", config);
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return JC42_OK;
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}
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