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/**
* @file temp.c
* Provides support for the TMP006 temperature sensor.
*
* Copyright (C) 2019 Clyne Sullivan
*
* 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 <https://www.gnu.org/licenses/>.
*/
#include "board.h"
#include "i2c/i2c.h"
// TMP006 I2C address
#define TEMP_ADDR (0x40)
// TMP006 registers
#define TMP006_CONFIG (0x02)
#define TMP006_VOBJ (0x00)
#define TMP006_TAMB (0x01)
#define TMP006_MANID (0xFE)
#define TMP006_DEVID (0xFF)
// TMP006 CONFIG register parameters
#define TMP006_CFG_RESET (0x8000)
#define TMP006_CFG_MODEON (0x7000)
#define TMP006_CFG_1SAMPLE (0x0000)
#define TMP006_CFG_2SAMPLE (0x0200)
#define TMP006_CFG_4SAMPLE (0x0400)
#define TMP006_CFG_8SAMPLE (0x0600)
#define TMP006_CFG_16SAMPLE (0x0800)
#define TMP006_CFG_DRDYEN (0x0100)
#define TMP006_CFG_DRDY (0x0080)
static void tempI2CWrite(uint8_t reg, uint16_t value);
static uint16_t tempI2CRead(uint8_t reg);
int tempInit(void)
{
// Prepare I2C
I2C_init(TEMP_ADDR);
// Initialize the TMP006 sensor
tempI2CWrite(TMP006_CONFIG, TMP006_CFG_MODEON | TMP006_CFG_DRDYEN |
TMP006_CFG_16SAMPLE);
// Check that the device is in fact the TMP006
if (tempI2CRead(TMP006_MANID) != 0x5449 ||
tempI2CRead(TMP006_DEVID) != 0x67)
return -1;
return 0;
}
void tempI2CWrite(uint8_t reg, uint16_t value)
{
uint8_t data[3] = {
reg,
value >> 8,
value & 0xFF
};
I2C_write(3, data);
}
uint16_t tempI2CRead(uint8_t reg)
{
uint8_t data[2] = {
reg,
0
};
I2C_write(1, data);
I2C_read(2, data);
return *((uint16_t *)data);
}
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