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/*
HDC100x for ChibiOS/RT - Copyright (C) 2016 Stephane D'Alu
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file HDC1000.c
* @brief HDC1000 interface module code.
*
* @addtogroup hdc1000
* @{
*/
#define I2C_HELPERS_AUTOMATIC_DRV TRUE
#include "hal.h"
#include "i2c_helpers.h"
#include "hdc1000.h"
/* DOC: http://www.ti.com/lit/ds/symlink/hdc1008.pdf
*/
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/* I2C Register */
#define HDC1000_REG_TEMP_HUMID 0x00
#define HDC1000_REG_TEMP 0x00
#define HDC1000_REG_HUMID 0x01
#define HDC1000_REG_CONFIG 0x02
#define HDC1000_REG_SERIAL 0xFB
#define HDC1000_REG_SERIAL_1 0xFB
#define HDC1000_REG_SERIAL_2 0xFC
#define HDC1000_REG_SERIAL_3 0xFD
#define HDC1000_REG_MANUF_ID 0xFE
#define HDC1000_REG_DEVICE_ID 0xFF
/* Configuration */
#define HDC1000_CONFIG_RST (1 << 15)
#define HDC1000_CONFIG_HEATER (1 << 13)
#define HDC1000_CONFIG_MODE_ONE (0 << 12)
#define HDC1000_CONFIG_MODE_BOTH (1 << 12)
#define HDC1000_CONFIG_BATT (1 << 11)
#define HDC1000_CONFIG_TRES_14 (0)
#define HDC1000_CONFIG_TRES_11 (1 << 10)
#define HDC1000_CONFIG_HRES_14 (0)
#define HDC1000_CONFIG_HRES_11 (1 << 8)
#define HDC1000_CONFIG_HRES_8 (1 << 9)
/* Value */
#define HDC1000_MANUF_ID 0x5449
#define HDC1000_DEVICE_ID 0x1000
/* Delay in micro seconds */
#define HDC1000_DELAY_ACQUIRE_SAFETY 1000
#define HDC1000_DELAY_ACQUIRE_TRES_14 6350
#define HDC1000_DELAY_ACQUIRE_TRES_11 3650
#define HDC1000_DELAY_ACQUIRE_HRES_14 6500
#define HDC1000_DELAY_ACQUIRE_HRES_11 3850
#define HDC1000_DELAY_ACQUIRE_HRES_8 2500
#define HDC1000_DELAY_STARTUP 15000
// Deefault config (high res)
#define HDC1000_CONFIG_RES (HDC1000_CONFIG_TRES_14 | \
HDC1000_CONFIG_HRES_14)
#define HDC1000_DELAY_ACQUIRE (HDC1000_DELAY_ACQUIRE_TRES_14 + \
HDC1000_DELAY_ACQUIRE_HRES_14)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
static inline msg_t
_apply_config(HDC1000_drv *drv) {
struct __attribute__((packed)) {
uint8_t reg;
uint16_t conf;
} tx = { HDC1000_REG_CONFIG, cpu_to_be16(drv->cfg) };
return i2c_send((uint8_t*)&tx, sizeof(tx));
}
static inline msg_t
_decode_measure(HDC1000_drv *drv,
uint32_t val, float *temperature, float *humidity) {
(void)drv;
/* Temperature */
if (temperature) {
float temp = (val >> 16);
temp /= 65536;
temp *= 165;
temp -= 40;
*temperature = temp;
}
/* Humidiy */
if (humidity) {
float hum = (val & 0xFFFF);
hum /= 65535;
hum *= 100;
*humidity = hum;
}
/* ok */
return MSG_OK;
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
void
HDC1000_init(HDC1000_drv *drv, HDC1000_config *config) {
drv->config = config;
drv->cfg = HDC1000_CONFIG_RST | HDC1000_CONFIG_MODE_BOTH |
HDC1000_CONFIG_RES;
drv->delay = (HDC1000_DELAY_ACQUIRE +
HDC1000_DELAY_ACQUIRE_SAFETY) / 1000;
drv->state = SENSOR_INIT;
}
msg_t
HDC1000_check(HDC1000_drv *drv) {
uint16_t manuf, device;
msg_t msg;
if (((msg = i2c_reg_recv16_be(HDC1000_REG_MANUF_ID, &manuf )) < MSG_OK) ||
((msg = i2c_reg_recv16_be(HDC1000_REG_DEVICE_ID, &device)) < MSG_OK))
return msg;
if ((manuf != HDC1000_MANUF_ID) || (device != HDC1000_DEVICE_ID))
return SENSOR_NOTFOUND;
return MSG_OK;
}
msg_t
HDC1000_start(HDC1000_drv *drv) {
osalDbgAssert((drv->state == SENSOR_INIT ) ||
(drv->state == SENSOR_ERROR ) ||
(drv->state == SENSOR_STOPPED),
"invalid state");
msg_t msg;
if ((msg = _apply_config(drv)) < MSG_OK) {
drv->state = SENSOR_ERROR;
return msg;
}
drv->state = SENSOR_STARTED;
return MSG_OK;
}
msg_t
HDC1000_stop(HDC1000_drv *drv) {
drv->state = SENSOR_STOPPED;
return MSG_OK;
}
msg_t
HDC1000_setHeater(HDC1000_drv *drv, bool on) {
if (on) { drv->cfg |= HDC1000_CONFIG_HEATER; }
else { drv->cfg &= ~HDC1000_CONFIG_HEATER; }
msg_t msg;
if ((msg = _apply_config(drv)) < MSG_OK) {
drv->state = SENSOR_ERROR;
return msg;
}
return MSG_OK;
}
msg_t
HDC1000_startMeasure(HDC1000_drv *drv) {
msg_t msg;
osalDbgAssert(drv->state == SENSOR_STARTED, "invalid state");
if ((msg = i2c_reg(HDC1000_REG_TEMP_HUMID)) < MSG_OK)
return msg;
drv->state = SENSOR_MEASURING;
return MSG_OK;
}
msg_t
HDC1000_readSerial(HDC1000_drv *drv, uint8_t *serial) {
msg_t msg;
osalDbgAssert(drv->state == SENSOR_STARTED, "invalid state");
if (((msg = i2c_reg_recv16(HDC1000_REG_SERIAL_1,
(uint16_t*)&serial[0])) < MSG_OK) ||
((msg = i2c_reg_recv16(HDC1000_REG_SERIAL_2,
(uint16_t*)&serial[2])) < MSG_OK) ||
((msg = i2c_reg_recv8 (HDC1000_REG_SERIAL_3,
(uint8_t*) &serial[4])) < MSG_OK))
return msg;
return MSG_OK;
}
msg_t
HDC1000_readMeasure(HDC1000_drv *drv,
float *temperature, float *humidity) {
msg_t msg;
uint32_t val;
osalDbgAssert((drv->state == SENSOR_MEASURING) ||
(drv->state == SENSOR_READY ),
"invalid state");
if ((msg = i2c_recv32_be(&val)) < MSG_OK) {
drv->state = SENSOR_ERROR;
return msg;
}
drv->state = SENSOR_STARTED;
return _decode_measure(drv, val, temperature, humidity);
}
msg_t
HDC1000_readTemperatureHumidity(HDC1000_drv *drv,
float *temperature, float *humidity) {
msg_t msg;
uint32_t val;
osalDbgAssert(drv->state == SENSOR_STARTED, "invalid state");
/* Request value */
if ((msg = i2c_reg(HDC1000_REG_TEMP_HUMID)) < MSG_OK)
return msg;
/* Wait */
osalThreadSleepMilliseconds(drv->delay);
/* Get value */
if ((msg = i2c_recv32_be(&val)) < MSG_OK) {
drv->state = SENSOR_ERROR;
return msg;
}
return _decode_measure(drv, val, temperature, humidity);
}
/** @} */
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