OrgApache/incubator-nuttx
OrgApache
/
incubator-nuttx
mirror of https://github.com/apache/incubator-nuttx.git
1
0
Fork 0
Code Issues Releases Wiki Activity
incubator-nuttx/drivers/sensors/ina3221.c

399 lines
13 KiB
C
Raw Blame History

/****************************************************************************
* drivers/sensors/ina3221.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <string.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/sensors/ina3221.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#if !defined(CONFIG_I2C)
# error i2c support required
#endif
#define INA3221_REG_CONFIG 0x00 /* See below */
#define INA3221_REG_CH1_SHUNT_VOLTAGE 0x01 /* Shunt voltage in 40 uV units */
#define INA3221_REG_CH1_BUS_VOLTAGE 0x02 /* Bus votlage in 8 mV units */
#define INA3221_REG_CH2_SHUNT_VOLTAGE 0x03 /* Shunt voltage in 40 uV units */
#define INA3221_REG_CH2_BUS_VOLTAGE 0x04 /* Bus votlage in 8 mV units */
#define INA3221_REG_CH3_SHUNT_VOLTAGE 0x05 /* Shunt voltage in 40 uV units */
#define INA3221_REG_CH3_BUS_VOLTAGE 0x06 /* Bus votlage in 8 mV units */
#define INA3221_REG_CH1_CRIT_LIMIT 0x07 /* Critical Alert limit */
#define INA3221_REG_CH1_WARN_LIMIT 0x08 /* Warning Alert limit */
#define INA3221_REG_CH2_CRIT_LIMIT 0x09 /* Critical Alert limit */
#define INA3221_REG_CH2_WARN_LIMIT 0x0A /* Warning Alert limit */
#define INA3221_REG_CH3_CRIT_LIMIT 0x0B /* Critical Alert limit */
#define INA3221_REG_CH3_WARN_LIMIT 0x0C /* Warning Alert limit */
#define INA3221_REG_VSHUNT_SUM 0x0D /* Shunt Voltage Sum */
#define INA3221_REG_VSHUNT_SUM_LIMIT 0x0E /* Shunt Voltage Sum Limit */
#define INA3221_REG_MASKENABLE 0x0F /* Mask/Enable register */
#define INA3221_REG_POWERVALID_UPPER 0x10 /* Power-Valid Upper Limit */
#define INA3221_REG_POWERVALID_LOWER 0x11 /* Power-Valid Lower Limit */
#define INA3221_REG_MANUFACTURER_ID 0xFE /* Always 0x5449 */
#define INA3221_REG_DIE_ID 0xFF /* Always 0x3220 */
#define INA3221_CONFIG_RST (1 << 15)
#ifndef CONFIG_INA3221_I2C_FREQUENCY
# define CONFIG_INA3221_I2C_FREQUENCY 400000
#endif
#define I2C_NOSTARTSTOP_MSGS 2
#define I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX 0
#define I2C_NOSTARTSTOP_DATA_MSG_INDEX 1
/****************************************************************************
* Private Types
****************************************************************************/
struct ina3221_dev_s
{
FAR struct i2c_master_s *i2c; /* I2C interface */
uint8_t addr; /* I2C address */
uint16_t config; /* INA 3221 config shadow */
int32_t shunt_resistor[3]; /* micro-ohms */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* I2C Helpers */
static int ina3221_write16(FAR struct ina3221_dev_s *priv,
uint8_t regaddr,
FAR uint16_t regvalue);
static int ina3221_read16(FAR struct ina3221_dev_s *priv,
uint8_t regaddr,
FAR uint16_t *regvalue);
static int ina3221_readpower(FAR struct ina3221_dev_s *priv,
FAR struct ina3221_s *buffer);
/* Character driver methods */
static ssize_t ina3221_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static ssize_t ina3221_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_ina3221fops =
{
NULL, /* open */
NULL, /* close */
ina3221_read, /* read */
ina3221_write, /* write */
};
/****************************************************************************
* Private Functions
****************************************************************************/
static int ina3221_access(FAR struct ina3221_dev_s *priv,
uint8_t start_register_address, bool reading,
FAR uint8_t *register_value, uint8_t data_length)
{
struct i2c_msg_s msg[I2C_NOSTARTSTOP_MSGS];
int ret;
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].frequency =
CONFIG_INA3221_I2C_FREQUENCY;
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].addr = priv->addr;
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].flags = 0;
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].buffer = &start_register_address;
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].length = 1;
msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].addr =
msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].addr;
msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].flags =
reading ? I2C_M_READ : 0;
msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].buffer = register_value;
msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].length = data_length;
ret = I2C_TRANSFER(priv->i2c, msg, I2C_NOSTARTSTOP_MSGS);
sninfo("start_register_address: "
"0x%02X data_length: %d register_value: 0x%02x (0x%04x) ret: %d\n",
start_register_address, data_length, *register_value,
*((FAR uint16_t *)register_value), ret);
return ret;
}
static int ina3221_read16(FAR struct ina3221_dev_s *priv, uint8_t regaddr,
FAR uint16_t *regvalue)
{
uint8_t buf[2];
int ret = ina3221_access(priv, regaddr, true, buf, 2);
if (ret == 0)
{
*regvalue = ((uint16_t)buf[0] << 8) | (uint16_t)buf[1];
}
return ret;
}
static int ina3221_write16(FAR struct ina3221_dev_s *priv, uint8_t regaddr,
FAR uint16_t regvalue)
{
uint8_t buf[2];
int ret;
buf[0] = (regvalue >> 8) & 0xff;
buf[1] = regvalue & 0xff;
ret = ina3221_access(priv, regaddr, false, buf, 2);
return ret;
}
/****************************************************************************
* Name: ina3221_readpower
*
* Description:
* Read the current and voltage register with special scaling
*
****************************************************************************/
static int ina3221_readpower(FAR struct ina3221_dev_s *priv,
FAR struct ina3221_s *buffer)
{
uint16_t reg;
int16_t sreg;
int64_t tmp;
int i;
int ret;
/* Loop for all 3 channels on the device */
for (i = 0; i < 3; i++)
{
if (priv->config & (INA3221_CONFIG_CH1_EN >> i))
{
/* Read the raw bus voltage */
ret = ina3221_read16(priv, (INA3221_REG_CH1_BUS_VOLTAGE + i * 2),
&reg);
if (ret < 0)
{
snerr("ERROR: ina3221_read16 failed: %d\n", ret);
return ret;
}
/* Convert register value to bus voltage */
sreg = (int16_t)reg;
sreg >>= 3; /* 3 LSB of reg are not used,
* but the value is signed */
buffer->ch[i].voltage = ((uint32_t)sreg) * 8000LU;
/* Read the raw shunt voltage */
ret = ina3221_read16(priv, (INA3221_REG_CH1_SHUNT_VOLTAGE + i * 2),
&reg);
if (ret < 0)
{
snerr("ERROR: ina3221_read16 failed: %d\n", ret);
return ret;
}
/* Convert register value to shunt voltage */
sreg = (int16_t)reg;
sreg >>= 3; /* 3 LSB of reg are not used,
* but the value is signed */
tmp = ((int64_t)(int16_t)sreg) * 40LL; /* micro volts across shunt */
/* Convert shunt voltage to current across the shunt resistor.
* I(uA) = U(uV)/R(ohms)
* = U(uV)/(R(uohms)/1000000)
* = U(uV) * 1000000 / R(uohms)
* We use a temporary 64-bit accumulator to avoid overflows.
*/
tmp = tmp * 1000000LL;
tmp = tmp / (int64_t)priv->shunt_resistor[i];
buffer->ch[i].current = (int32_t)tmp;
sninfo("Voltage: %u uV, Current: %d uA\n",
buffer->ch[i].voltage, buffer->ch[i].current);
}
}
return OK;
}
/****************************************************************************
* Name: ina3221_read
****************************************************************************/
static ssize_t ina3221_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct inode *inode = filep->f_inode;
FAR struct ina3221_dev_s *priv = inode->i_private;
FAR struct ina3221_s *ptr;
ssize_t nsamples;
int i;
int ret;
/* How many samples were requested to get? */
nsamples = buflen / sizeof(struct ina3221_s);
ptr = (FAR struct ina3221_s *)buffer;
sninfo("buflen: %d nsamples: %d\n", buflen, nsamples);
/* Get the requested number of samples */
for (i = 0; i < nsamples; i++)
{
struct ina3221_s pwr;
/* Read the next struct ina3221_s power value */
ret = ina3221_readpower(priv, &pwr);
if (ret < 0)
{
snerr("ERROR: ina3221_readpower failed: %d\n", ret);
return (ssize_t)ret;
}
/* Save the temperature value in the user buffer */
*ptr++ = pwr;
}
return nsamples * sizeof(struct ina3221_s);
}
/****************************************************************************
* Name: ina3221_write
****************************************************************************/
static ssize_t ina3221_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
return -ENOSYS;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ina3221_register
*
* Description:
* Register the INA3221 character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/pwrmntr0"
* i2c - An instance of the I2C interface to use to communicate with
* INA3221
* config - Configuration including I2C address, shunt values, and INA3221
* configuration mask.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int ina3221_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
FAR const struct ina3221_config_s *config)
{
FAR struct ina3221_dev_s *priv;
int ret = 0;
/* Sanity check */
DEBUGASSERT(i2c != NULL);
/* Initialize the ina3221 device structure */
priv = (FAR struct ina3221_dev_s *)
kmm_malloc(sizeof(struct ina3221_dev_s));
if (priv == NULL)
{
snerr("ERROR: Failed to allocate instance\n");
return -ENOMEM;
}
priv->i2c = i2c;
priv->addr = config->addr;
/* Save the config (except opmode) */
priv->config = config->cfgreg & ~(INA3221_CONFIG_RST);
/* Copy the shunt resistor values */
memcpy(priv->shunt_resistor, config->shunt_resistor, 3 * sizeof(int32_t));
/* Apply config, keep chip switched off */
ret = ina3221_write16(priv, INA3221_REG_CONFIG, priv->config);
if (ret < 0)
{
snerr("ERROR: Failed to apply config: %d\n", ret);
goto errout;
}
/* Register the character driver */
ret = register_driver(devpath, &g_ina3221fops, 0666, priv);
if (ret < 0)
{
snerr("ERROR: Failed to register driver: %d\n", ret);
goto errout;
}
sninfo("(addr=0x%02x) registered at %s\n", priv->addr, devpath);
return ret;
errout:
kmm_free(priv);
return ret;
}
Reference in New Issue View Git Blame Copy Permalink