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incubator-nuttx/drivers/sensors/bmp280.c

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/****************************************************************************
* drivers/sensors/bmp280.c
*
* Copyright 2018 Sony Semiconductor Solutions Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of Sony Semiconductor Solutions Corporation nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdlib.h>
#include <fixedmath.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/sensors/bmp280.h>
#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_BMP280)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define BMP280_ADDR 0x76
#define BMP280_FREQ 400000
#define DEVID 0x58
#define BMP280_DIG_T1_LSB 0x88
#define BMP280_DIG_T1_MSB 0x89
#define BMP280_DIG_T2_LSB 0x8a
#define BMP280_DIG_T2_MSB 0x8b
#define BMP280_DIG_T3_LSB 0x8c
#define BMP280_DIG_T3_MSB 0x8d
#define BMP280_DIG_P1_LSB 0x8e
#define BMP280_DIG_P1_MSB 0x8f
#define BMP280_DIG_P2_LSB 0x90
#define BMP280_DIG_P2_MSB 0x91
#define BMP280_DIG_P3_LSB 0x92
#define BMP280_DIG_P3_MSB 0x93
#define BMP280_DIG_P4_LSB 0x94
#define BMP280_DIG_P4_MSB 0x95
#define BMP280_DIG_P5_LSB 0x96
#define BMP280_DIG_P5_MSB 0x97
#define BMP280_DIG_P6_LSB 0x98
#define BMP280_DIG_P6_MSB 0x99
#define BMP280_DIG_P7_LSB 0x9a
#define BMP280_DIG_P7_MSB 0x9b
#define BMP280_DIG_P8_LSB 0x9c
#define BMP280_DIG_P8_MSB 0x9d
#define BMP280_DIG_P9_LSB 0x9e
#define BMP280_DIG_P9_MSB 0x9f
#define BMP280_DEVID 0xd0
#define BMP280_SOFT_RESET 0xe0
#define BMP280_STAT 0xf3
#define BMP280_CTRL_MEAS 0xf4
#define BMP280_CONFIG 0xf5
#define BMP280_PRESS_MSB 0xf7
#define BMP280_PRESS_LSB 0xf8
#define BMP280_PRESS_XLSB 0xf9
#define BMP280_TEMP_MSB 0xfa
#define BMP280_TEMP_LSB 0xfb
#define BMP280_TEMP_XLSB 0xfc
/* Power modes */
#define BMP280_SLEEP_MODE (0x00)
#define BMP280_FORCED_MODE (0x01)
#define BMP280_NORMAL_MODE (0x03)
/* Oversampling for temperature. */
#define BMP280_OST_SKIPPED (0x00 << 5)
#define BMP280_OST_X1 (0x01 << 5)
#define BMP280_OST_X2 (0x02 << 5)
#define BMP280_OST_X4 (0x03 << 5)
#define BMP280_OST_X8 (0x04 << 5)
#define BMP280_OST_X16 (0x05 << 5)
/* Oversampling for pressure. */
#define BMP280_OSP_SKIPPED (0x00 << 2)
#define BMP280_OSP_X1 (0x01 << 2)
#define BMP280_OSP_X2 (0x02 << 2)
#define BMP280_OSP_X4 (0x03 << 2)
#define BMP280_OSP_X8 (0x04 << 2)
#define BMP280_OSP_X16 (0x05 << 2)
/* Predefined oversampling combinations. */
#define BMP280_OS_ULTRA_HIGH_RES (BMP280_OSP_X16 | BMP280_OST_X2)
#define BMP280_OS_STANDARD_RES (BMP280_OSP_X4 | BMP280_OST_X1)
#define BMP280_OS_ULTRA_LOW_POWER (BMP280_OSP_X1 | BMP280_OST_X1)
/* Data combined from bytes to int */
#define COMBINE(d) (((int)(d)[0] << 12) | ((int)(d)[1] << 4) | ((int)(d)[2] >> 4))
/****************************************************************************
* Private Type Definitions
****************************************************************************/
struct bmp280_dev_s
{
FAR struct i2c_master_s *i2c; /* I2C interface */
uint8_t addr; /* BMP280 I2C address */
int freq; /* BMP280 Frequency <= 3.4MHz */
int compensated; /* 0: uncompensated, 1:compensated */
struct bmp280_calib_s
{
uint16_t t1;
int16_t t2;
int16_t t3;
uint16_t p1;
int16_t p2;
int16_t p3;
int16_t p4;
int16_t p5;
int16_t p6;
int16_t p7;
int16_t p8;
int16_t p9;
} calib;
int32_t tempfine;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static uint8_t bmp280_getreg8(FAR struct bmp280_dev_s *priv, uint8_t regaddr);
static void bmp280_putreg8(FAR struct bmp280_dev_s *priv, uint8_t regaddr,
uint8_t regval);
static uint32_t bmp280_getpressure(FAR struct bmp280_dev_s *priv);
/* Character driver methods */
static int bmp280_open(FAR struct file *filep);
static int bmp280_close(FAR struct file *filep);
static ssize_t bmp280_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static int bmp280_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_bmp280fops =
{
bmp280_open, /* open */
bmp280_close, /* close */
bmp280_read, /* read */
0, /* write */
0, /* seek */
bmp280_ioctl, /* ioctl */
#ifndef CONFIG_DISABLE_POLL
0, /* poll */
#endif
0 /* unlink */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: bmp280_getreg8
*
* Description:
* Read from an 8-bit BMP280 register
*
****************************************************************************/
static uint8_t bmp280_getreg8(FAR struct bmp280_dev_s *priv, uint8_t regaddr)
{
struct i2c_msg_s msg[2];
uint8_t regval = 0;
int ret;
msg[0].frequency = priv->freq;
msg[0].addr = priv->addr;
msg[0].flags = 0;
msg[0].buffer = &regaddr;
msg[0].length = 1;
msg[1].frequency = priv->freq;
msg[1].addr = priv->addr;
msg[1].flags = I2C_M_READ;
msg[1].buffer = &regval;
msg[1].length = 1;
ret = I2C_TRANSFER(priv->i2c, msg, 2);
if (ret < 0)
{
snerr("I2C_TRANSFER failed: %d\n", ret);
return 0;
}
return regval;
}
/****************************************************************************
* Name: bmp280_getregs
*
* Description:
* Read two 8-bit from a BMP280 register
*
****************************************************************************/
static int bmp280_getregs(FAR struct bmp280_dev_s *priv, uint8_t regaddr,
uint8_t *rxbuffer, uint8_t length)
{
struct i2c_msg_s msg[2];
int ret;
msg[0].frequency = priv->freq;
msg[0].addr = priv->addr;
msg[0].flags = 0;
msg[0].buffer = &regaddr;
msg[0].length = 1;
msg[1].frequency = priv->freq;
msg[1].addr = priv->addr;
msg[1].flags = I2C_M_READ;
msg[1].buffer = rxbuffer;
msg[1].length = length;
ret = I2C_TRANSFER(priv->i2c, msg, 2);
if (ret < 0)
{
snerr("I2C_TRANSFER failed: %d\n", ret);
return -1;
}
return OK;
}
/****************************************************************************
* Name: bmp280_putreg8
*
* Description:
* Write to an 8-bit BMP280 register
*
****************************************************************************/
static void bmp280_putreg8(FAR struct bmp280_dev_s *priv, uint8_t regaddr,
uint8_t regval)
{
struct i2c_msg_s msg[2];
uint8_t txbuffer[2];
int ret;
txbuffer[0] = regaddr;
txbuffer[1] = regval;
msg[0].frequency = priv->freq;
msg[0].addr = priv->addr;
msg[0].flags = 0;
msg[0].buffer = txbuffer;
msg[0].length = 2;
ret = I2C_TRANSFER(priv->i2c, msg, 1);
if (ret < 0)
{
snerr("I2C_TRANSFER failed: %d\n", ret);
}
}
/****************************************************************************
* Name: bmp280_checkid
*
* Description:
* Read and verify the BMP280 chip ID
*
****************************************************************************/
static int bmp280_checkid(FAR struct bmp280_dev_s *priv)
{
uint8_t devid = 0;
/* Read device ID */
devid = bmp280_getreg8(priv, BMP280_DEVID);
up_mdelay(1);
sninfo("devid: 0x%02x\n", devid);
if (devid != (uint16_t) DEVID)
{
/* ID is not Correct */
snerr("Wrong Device ID! %02x\n", devid);
return -ENODEV;
}
return OK;
}
/****************************************************************************
* Name: bmp280_set_standby
*
* Description:
* set standby duration
*
****************************************************************************/
static int bmp280_set_standby(FAR struct bmp280_dev_s *priv, uint8_t value)
{
uint8_t v_data_u8;
uint8_t v_sb_u8;
/* Set the standby duration value */
v_data_u8 = bmp280_getreg8(priv, BMP280_CONFIG);
v_data_u8 = (v_data_u8 & ~(0x07 << 5)) | (value << 5);
bmp280_putreg8(priv, BMP280_CONFIG, v_data_u8);
/* Check the standby duration value */
v_data_u8 = bmp280_getreg8(priv, BMP280_CONFIG);
v_sb_u8 = (v_data_u8 >> 5) & 0x07;
if (v_sb_u8 != value)
{
snerr("Failed to set value for standby time.");
return ERROR;
}
return OK;
}
/****************************************************************************
* Name: bmp280_initialize
*
* Description:
* Initialize BMP280 device
*
****************************************************************************/
static int bmp280_initialize(FAR struct bmp280_dev_s *priv)
{
uint8_t buf[24];
int ret;
/* Get calibration data. */
ret = bmp280_getregs(priv, BMP280_DIG_T1_LSB, buf, 24);
if (ret < 0)
{
return ret;
}
priv->calib.t1 = (uint16_t)buf[1] << 8 | buf[0];
priv->calib.t2 = (int16_t) buf[3] << 8 | buf[2];
priv->calib.t3 = (int16_t) buf[5] << 8 | buf[4];
priv->calib.p1 = (uint16_t)buf[7] << 8 | buf[6];
priv->calib.p2 = (int16_t) buf[9] << 8 | buf[8];
priv->calib.p3 = (int16_t) buf[11] << 8 | buf[10];
priv->calib.p4 = (int16_t) buf[13] << 8 | buf[12];
priv->calib.p5 = (int16_t) buf[15] << 8 | buf[14];
priv->calib.p6 = (int16_t) buf[17] << 8 | buf[16];
priv->calib.p7 = (int16_t) buf[19] << 8 | buf[18];
priv->calib.p8 = (int16_t) buf[21] << 8 | buf[20];
priv->calib.p9 = (int16_t) buf[23] << 8 | buf[22];
sninfo("T1 = %u\n", priv->calib.t1);
sninfo("T2 = %d\n", priv->calib.t2);
sninfo("T3 = %d\n", priv->calib.t3);
sninfo("P1 = %u\n", priv->calib.p1);
sninfo("P2 = %d\n", priv->calib.p2);
sninfo("P3 = %d\n", priv->calib.p3);
sninfo("P4 = %d\n", priv->calib.p4);
sninfo("P5 = %d\n", priv->calib.p5);
sninfo("P6 = %d\n", priv->calib.p6);
sninfo("P7 = %d\n", priv->calib.p7);
sninfo("P8 = %d\n", priv->calib.p8);
sninfo("P9 = %d\n", priv->calib.p9);
/* Set power mode to sleep */
bmp280_putreg8(priv, BMP280_CTRL_MEAS, BMP280_SLEEP_MODE);
/* Set stand-by time to 1 ms, no IIR filter */
ret = bmp280_set_standby(priv, BMP280_STANDBY_1_MS);
if (ret != OK)
{
snerr("Failed to set value for standby time.\n");
return -1;
}
return ret;
}
/****************************************************************************
* Name: bmp280_compensate
*
* Description:
* calculate compensate tempreture
*
* Input Parameters:
* temp - uncompensate value of tempreture.
*
* Returned Value:
* calculate result of compensate tempreture.
*
****************************************************************************/
static int32_t bmp280_compensate_temp(FAR struct bmp280_dev_s *priv,
int32_t temp)
{
struct bmp280_calib_s *c = &priv->calib;
int32_t var1;
int32_t var2;
var1 = ((((temp >> 3) - ((int32_t)c->t1 << 1))) * ((int32_t)c->t2)) >> 11;
var2 = (((((temp >> 4) - ((int32_t)c->t1)) *
((temp >> 4) - ((int32_t)c->t1))) >> 12) *
((int32_t)c->t3)) >> 14;
priv->tempfine = var1 + var2;
return (priv->tempfine * 5 + 128) >> 8;
}
/****************************************************************************
* Name: bmp280_compensate_press
*
* Description:
* calculate compensate pressure
*
* Input Parameters:
* press - uncompensate value of pressure.
*
* Returned Value:
* calculate result of compensate pressure.
*
****************************************************************************/
static uint32_t bmp280_compensate_press(FAR struct bmp280_dev_s *priv,
uint32_t press, int32_t temp)
{
struct bmp280_calib_s *c = &priv->calib;
int32_t var1;
int32_t var2;
uint32_t p;
/* Update temperature fine value first. */
bmp280_compensate_temp(priv, temp);
var1 = (priv->tempfine >> 1) - 64000;
var2 = (((var1 >> 2) * (var1 >> 2)) >> 11) * ((int32_t)c->p6);
var2 = var2 + ((var1 * ((int32_t)c->p5)) << 1);
var2 = (var2 >> 2) + (((int32_t)c->p4) << 16);
var1 = (((c->p3 * (((var1 >> 2) * (var1 >> 2)) >> 13)) >> 3) +
((((int32_t)c->p2) * var1) >> 1)) >> 18;
var1 = (((32768 + var1) * ((int32_t)c->p1)) >> 15);
/* avoid exception caused by division by zero */
if (var1 == 0)
{
return 0;
}
p = (((uint32_t)((0x100000) - press) - (var2 >> 12))) * 3125;
if (p < 0x80000000)
{
p = (p << 1) / ((uint32_t)var1);
}
else
{
p = (p / (uint32_t)var1) * 2;
}
var1 = ((int32_t)c->p9 * ((int32_t)(((p >> 3) * (p >> 3)) >> 13))) >> 12;
var2 = ((int32_t)(p >> 2) * c->p8) >> 13;
p = (uint32_t)((int32_t)p + ((var1 + var2 + c->p7) >> 4));
return p;
}
/****************************************************************************
* Name: bmp280_getpressure
*
* Description:
* Calculate the Barometric Pressure using the temperature compensated
* See BMP280 data sheet for details
*
****************************************************************************/
static uint32_t bmp280_getpressure(FAR struct bmp280_dev_s *priv)
{
uint8_t buf[6];
uint32_t press;
int32_t temp;
bmp280_getregs(priv, BMP280_PRESS_MSB, buf, 6);
press = (uint32_t)COMBINE(buf);
temp = COMBINE(&buf[3]);
sninfo("press = %d, temp = %d\n", press, temp);
if (priv->compensated == ENABLE_COMPENSATED)
{
press = bmp280_compensate_press(priv, press, temp);
}
return press;
}
/****************************************************************************
* Name: bmp280_open
*
* Description:
* This function is called whenever the BMP280 device is opened.
*
****************************************************************************/
static int bmp280_open(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct bmp280_dev_s *priv = inode->i_private;
/* Set power mode to normal and standard sampling resolusion. */
bmp280_putreg8(priv, BMP280_CTRL_MEAS, BMP280_NORMAL_MODE |
BMP280_OS_STANDARD_RES);
return OK;
}
/****************************************************************************
* Name: bmp280_close
*
* Description:
* This routine is called when the BMP280 device is closed.
*
****************************************************************************/
static int bmp280_close(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct bmp280_dev_s *priv = inode->i_private;
/* Set power mode to sleep */
bmp280_putreg8(priv, BMP280_CTRL_MEAS, BMP280_SLEEP_MODE);
return OK;
}
/****************************************************************************
* Name: bmp280_read
****************************************************************************/
static ssize_t bmp280_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct inode *inode = filep->f_inode;
FAR struct bmp280_dev_s *priv = inode->i_private;
FAR uint32_t *press = (FAR uint32_t *) buffer;
if (!buffer)
{
snerr("Buffer is null\n");
return -1;
}
if (buflen < 4)
{
snerr("You can't read something other than 32 bits (4 bytes)\n");
return -1;
}
/* Get the pressure compensated */
*press = bmp280_getpressure(priv);
/* Return size of uint32_t (4 bytes) */
return 4;
}
/****************************************************************************
* Name: bmp280_ioctl
****************************************************************************/
static int bmp280_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode = filep->f_inode;
FAR struct bmp280_dev_s *priv = inode->i_private;
int ret = OK;
switch (cmd)
{
case SNIOC_ENABLE_COMPENSATED:
priv->compensated = (int)arg;
break;
case SNIOC_SETSTB:
ret = bmp280_set_standby(priv, arg);
break;
default:
snerr("Unrecognized cmd: %d\n", cmd);
ret = - ENOTTY;
break;
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: bmp280_register
*
* Description:
* Register the BMP280 character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/press0"
* i2c - An instance of the I2C interface to use to communicate with
* BMP280
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int bmp280_register(FAR const char *devpath, FAR struct i2c_master_s *i2c)
{
FAR struct bmp280_dev_s *priv;
int ret;
/* Initialize the BMP280 device structure */
priv = (FAR struct bmp280_dev_s *)kmm_malloc(sizeof(struct bmp280_dev_s));
if (!priv)
{
snerr("Failed to allocate instance\n");
return -ENOMEM;
}
priv->i2c = i2c;
priv->addr = BMP280_ADDR;
priv->freq = BMP280_FREQ;
priv->compensated = ENABLE_COMPENSATED;
/* Check Device ID */
ret = bmp280_checkid(priv);
if (ret < 0)
{
snerr("Failed to register driver: %d\n", ret);
kmm_free(priv);
return ret;
}
ret = bmp280_initialize(priv);
if (ret < 0)
{
snerr("Failed to initialize physical device bmp280:%d\n", ret);
kmm_free(priv);
return ret;
}
/* Register the character driver */
ret = register_driver(devpath, &g_bmp280fops, 0666, priv);
if (ret < 0)
{
snerr("Failed to register driver: %d\n", ret);
kmm_free(priv);
}
sninfo("BMP280 driver loaded successfully!\n");
return ret;
}
#endif
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