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incubator-nuttx/drivers/sensors/as726x.c

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/****************************************************************************
* drivers/sensors/as726x.c
* Character driver for the AS7263 6-Ch NIR Spectral Sensing Engine
* and AS7262 Consumer Grade Smart 6-Channel VIS Sensor
*
* Copyright (C) 2019 Fabian Justi. All rights reserved.
* Author: Fabian Justi <Fabian.Justi@gmx.de> and
* Andreas Kurz <andreas.kurz@methodpark.de>
*
* 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 NuttX 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 <assert.h>
#include <errno.h>
#include <debug.h>
#include <stdlib.h>
#include <string.h>
#include <nuttx/kmalloc.h>
#include <nuttx/signal.h>
#include <nuttx/random.h>
#include <nuttx/fs/fs.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/sensors/as726x.h>
#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_AS726X)
/****************************************************************************
* Pre-process Definitions
****************************************************************************/
#ifndef CONFIG_AS726X_I2C_FREQUENCY
# define CONFIG_AS726X_I2C_FREQUENCY 100000
#endif
#define AS726X_INTEGRATION_TIME 50
#define AS726X_GAIN 0b01 /* Set gain to 64x */
#define AS726X_MEASURMENT_MODE 0b10 /* One-shot reading of VBGYOR or RSTUVW */
/****************************************************************************
* Private Types
****************************************************************************/
struct as726x_dev_s
{
FAR struct i2c_master_s *i2c; /* I2C interface */
uint8_t addr; /* I2C address */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static float as726x_getcalibrated(FAR struct as726x_dev_s *priv,
uint8_t regaddr);
static int16_t as726x_getchannel(FAR struct as726x_dev_s *priv,
uint8_t regaddr);
/* I2C Helpers */
static uint8_t read_register(FAR struct as726x_dev_s *priv, uint8_t addr);
static uint8_t as726x_read8(FAR struct as726x_dev_s *priv, uint8_t regval);
static void write_register(FAR struct as726x_dev_s *priv, uint8_t addr,
uint8_t val);
static void as726x_write8(FAR struct as726x_dev_s *priv, uint8_t regaddr,
uint8_t regval);
/* Character driver methods */
static ssize_t as726x_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static ssize_t as726x_write(FAR struct file *filep,
FAR const char *buffer, size_t buflen);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_as726x_fops =
{
NULL, /* open */
NULL, /* close */
as726x_read, /* read */
as726x_write, /* write */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: as726x_getcalibrated
*
* Description:
* Read calibrated value
*
****************************************************************************/
static float as726x_getcalibrated(FAR struct as726x_dev_s *priv,
uint8_t regaddr)
{
uint8_t byte0 = as726x_read8(priv, regaddr + 0);
uint8_t byte1 = as726x_read8(priv, regaddr + 1);
uint8_t byte2 = as726x_read8(priv, regaddr + 2);
uint8_t byte3 = as726x_read8(priv, regaddr + 3);
uint32_t colourdata = ((uint32_t) byte0 << (8 * 3));
colourdata |= ((uint32_t) byte1 << (8 * 2));
colourdata |= ((uint32_t) byte2 << (8 * 1));
colourdata |= ((uint32_t) byte3 << (8 * 0));
return *((float *)(&colourdata));
}
/****************************************************************************
* Name: as726x_getchannel
*
* Description:
* Read colour channel
*
****************************************************************************/
static int16_t as726x_getchannel(FAR struct as726x_dev_s *priv,
uint8_t regaddr)
{
int16_t colourdata = as726x_read8(priv, regaddr) << 8;
colourdata |= as726x_read8(priv, regaddr + 1);
return colourdata;
}
/****************************************************************************
* Name: as726x_read8
*
* Description:
* Read 8-bit register
*
****************************************************************************/
static uint8_t read_register(FAR struct as726x_dev_s *priv, uint8_t addr)
{
struct i2c_config_s config;
uint8_t regval = 0;
int ret;
config.frequency = CONFIG_AS726X_I2C_FREQUENCY;
config.address = AS726X_I2C_ADDR;
config.addrlen = 7;
ret = i2c_write(priv->i2c, &config, &addr, 1);
if (ret < 0)
{
snerr("ERROR: i2c_write failed: %d\n", ret);
return ret;
}
ret = i2c_read(priv->i2c, &config, &regval, 1);
if (ret < 0)
{
snerr("ERROR: i2c_read failed: %d\n", ret);
return ret;
}
return regval;
}
static uint8_t as726x_read8(FAR struct as726x_dev_s *priv, uint8_t regaddr)
{
uint8_t status;
status = read_register(priv, AS72XX_SLAVE_STATUS_REG);
if ((status & AS72XX_SLAVE_RX_VALID) != 0)
{
/* There is data to be read.
* Read the byte but do nothing with it.
*/
read_register(priv, AS72XX_SLAVE_READ_REG);
}
/* Wait for WRITE flag to clear */
while (1)
{
status = read_register(priv, AS72XX_SLAVE_STATUS_REG);
if ((status & AS72XX_SLAVE_TX_VALID) == 0)
{
break; /* If TX bit is clear, it is ok to write */
}
nxsig_usleep(AS726X_POLLING_DELAY);
}
/* Send the virtual register address (bit 7 should be 0 to indicate we are
* reading a register).
*/
write_register(priv, AS72XX_SLAVE_WRITE_REG, regaddr);
/* Wait for READ flag to be set */
while (1)
{
status = read_register(priv, AS72XX_SLAVE_STATUS_REG);
if ((status & AS72XX_SLAVE_RX_VALID) != 0)
{
break; /* Read data is ready. */
}
nxsig_usleep(AS726X_POLLING_DELAY);
}
uint8_t incoming = read_register(priv, AS72XX_SLAVE_READ_REG);
return incoming;
}
/****************************************************************************
* Name: as726x_write8
*
* Description:
* Write from an 8-bit register
*
****************************************************************************/
static void write_register(FAR struct as726x_dev_s *priv, uint8_t addr,
uint8_t val)
{
struct i2c_config_s config;
uint8_t msg[2] =
{
0
};
int ret;
config.frequency = CONFIG_AS726X_I2C_FREQUENCY;
config.address = AS726X_I2C_ADDR;
config.addrlen = 7;
msg[0] = addr;
msg[1] = val;
ret = i2c_write(priv->i2c, &config, msg, 2);
if (ret < 0)
{
snerr("ERROR: i2c_write failed: %d\n", ret);
return;
}
}
static void as726x_write8(FAR struct as726x_dev_s *priv, uint8_t regaddr,
uint8_t regval)
{
uint8_t status;
while (1)
{
status = read_register(priv, AS72XX_SLAVE_STATUS_REG);
if ((status & AS72XX_SLAVE_TX_VALID) == 0)
{
/* No inbound TX pending at slave. Okay to write now. */
break;
}
nxsig_usleep(AS726X_POLLING_DELAY);
}
/* Send the virtual register address (setting bit 7 to indicate we are
* writing to a register).
*/
write_register(priv, AS72XX_SLAVE_WRITE_REG, (regaddr | 0x80));
/* Wait for WRITE register to be empty */
while (1)
{
status = read_register(priv, AS72XX_SLAVE_STATUS_REG);
if ((status & AS72XX_SLAVE_TX_VALID) == 0)
{
/* No inbound TX pending at slave. Okay to write now. */
break;
}
nxsig_usleep(AS726X_POLLING_DELAY);
}
/* Send the data to complete the operation. */
write_register(priv, AS72XX_SLAVE_WRITE_REG, regval);
}
/****************************************************************************
* Name: as726x_read
****************************************************************************/
static ssize_t as726x_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct inode *inode = filep->f_inode;
FAR struct as726x_dev_s *priv = inode->i_private;
FAR struct as726x_sensor_data_s *data =
(FAR struct as726x_sensor_data_s *)buffer;
/* Check if the user is reading the right size */
if (buflen < sizeof(FAR struct as726x_sensor_data_s))
{
snerr("ERROR: Not enough memory for reading all channels.\n");
return -ENOSYS;
}
else
{
data->v_r_value = as726x_getchannel(priv, AS726X_V_R);
data->b_s_value = as726x_getchannel(priv, AS726X_B_S);
data->g_t_value = as726x_getchannel(priv, AS726X_G_T);
data->y_u_value = as726x_getchannel(priv, AS726X_Y_U);
data->o_v_value = as726x_getchannel(priv, AS726X_O_V);
data->r_w_value = as726x_getchannel(priv, AS726X_R_W);
}
return buflen;
}
/****************************************************************************
* Name: as726x_write
****************************************************************************/
static ssize_t as726x_write(FAR struct file *filep,
FAR const char *buffer, size_t buflen)
{
return -ENOSYS;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: as726x_register
*
* Description:
* Register the AS726X character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/spectr0"
* i2c - An instance of the I2C interface to use to communicate with AS726X
* addr - The I2C address of the AS726X.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int as726x_register(FAR const char *devpath, FAR struct i2c_master_s *i2c)
{
FAR struct as726x_dev_s *priv;
uint8_t _sensor_version;
uint8_t value;
int ret;
/* Sanity check */
DEBUGASSERT(i2c != NULL);
/* Initialize the AS726X device structure */
priv = kmm_malloc(sizeof(struct as726x_dev_s));
if (priv == NULL)
{
snerr("ERROR: Failed to allocate instance\n");
return -ENOMEM;
}
priv->i2c = i2c;
priv->addr = AS726X_I2C_ADDR;
/* Check HW version for AS7262 and AS7263 */
_sensor_version = as726x_read8(priv, AS726X_HW_VERSION);
if (_sensor_version != 0x3e && _sensor_version != 0x3f)
{
snerr("ID (should be 0x3e or 0x3f): 0x %d\n", ret);
}
/* Initialize the device
* Read the register value toggle and disable led
*/
ret = as726x_read8(priv, AS726X_LED_CONTROL);
if (ret < 0)
{
snerr("ERROR: Failed to initialize the AS726X!\n");
return ret;
}
value = ret;
value &= ~(1 << 0); /* Clear the bit */
as726x_write8(priv, AS726X_LED_CONTROL, value);
/* If you use Mode 2 or 3 (all the colors) then integration time is double.
* 140*2 = 280ms between readings.
* 50 * 2.8ms = 140ms. 0 to 255 is valid.
*/
as726x_write8(priv, AS726X_INT_T, AS726X_INTEGRATION_TIME);
ret = as726x_read8(priv, AS726X_CONTROL_SETUP);
if (ret < 0)
{
snerr("ERROR: Failed to initialize the AS726X!\n");
return ret;
}
value = ret;
value &= 0b11001111; /* Clear GAIN bits */
value |= (AS726X_GAIN << 4); /* Set GAIN bits with user's choice */
as726x_write8(priv, AS726X_CONTROL_SETUP, value);
ret = as726x_read8(priv, AS726X_CONTROL_SETUP);
if (ret < 0)
{
snerr("ERROR: Failed to initialize the AS726X!\n");
return ret;
}
value = ret;
value &= 0b11110011; /* Clear BANK bits */
value |= (AS726X_MEASURMENT_MODE << 2); /* Set BANK bits with user's
* choice */
as726x_write8(priv, AS726X_CONTROL_SETUP, value);
/* Register the character driver */
ret = register_driver(devpath, &g_as726x_fops, 0666, priv);
if (ret < 0)
{
snerr("ERROR: Failed to register driver: %d\n", ret);
kmm_free(priv);
}
return ret;
}
#endif /* CONFIG_I2C && CONFIG_SENSORS_AS726X */
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