708 lines
19 KiB
C
708 lines
19 KiB
C
/****************************************************************************
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* drivers/sensors/bmi270_uorb.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <math.h>
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <sys/param.h>
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#include <nuttx/mutex.h>
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#include <nuttx/signal.h>
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#include <nuttx/compiler.h>
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#include <nuttx/nuttx.h>
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#include <nuttx/kthread.h>
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#include <nuttx/sensors/sensor.h>
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#include <nuttx/sensors/ioctl.h>
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#include "bmi270_base.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define CONSTANTS_ONE_G 9.8f
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/****************************************************************************
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* Private Types
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****************************************************************************/
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enum bmi270_idx_e
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{
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BMI270_ACCEL_IDX = 0,
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BMI270_GYRO_IDX,
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BMI270_MAX_IDX
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};
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struct bmi270_sensor_s
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{
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struct sensor_lowerhalf_s lower;
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uint64_t last_update;
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float scale;
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FAR void *dev;
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bool enabled;
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#ifdef CONFIG_SENSORS_BMI270_POLL
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unsigned long interval;
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#endif
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struct bmi270_dev_s base;
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};
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struct bmi270_sensor_dev_s
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{
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struct bmi270_sensor_s priv[BMI270_MAX_IDX];
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mutex_t lock;
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#ifdef CONFIG_SENSORS_BMI270_POLL
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sem_t run;
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#endif
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Sensor methods */
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static int bmi270_activate(FAR struct sensor_lowerhalf_s *lower,
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FAR struct file *filep,
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bool enable);
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static int bmi270_set_interval(FAR struct sensor_lowerhalf_s *lower,
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FAR struct file *filep,
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FAR unsigned long *period_us);
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#ifndef CONFIG_SENSORS_BMI270_POLL
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static int bmi270_fetch(FAR struct sensor_lowerhalf_s *lower,
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FAR struct file *filep,
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FAR char *buffer, size_t buflen);
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#endif
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static int bmi270_control(FAR struct sensor_lowerhalf_s *lower,
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FAR struct file *filep,
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int cmd, unsigned long arg);
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/* Helpers */
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static int bmi270_accel_scale(FAR struct bmi270_sensor_s *priv,
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uint8_t scale);
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static int bmi270_gyro_scale(FAR struct bmi270_sensor_s *priv,
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uint16_t scale);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct sensor_ops_s g_sensor_ops =
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{
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NULL, /* open */
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NULL, /* close */
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bmi270_activate,
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bmi270_set_interval,
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NULL, /* batch */
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#ifdef CONFIG_SENSORS_BMI270_POLL
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NULL, /* fetch */
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#else
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bmi270_fetch,
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#endif
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NULL, /* selftest */
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NULL, /* set_calibvalue */
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NULL, /* calibrate */
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bmi270_control
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: bmi270_activate
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****************************************************************************/
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static int bmi270_activate(FAR struct sensor_lowerhalf_s *lower,
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FAR struct file *filep, bool enable)
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{
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FAR struct bmi270_sensor_s *priv = NULL;
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FAR struct bmi270_sensor_dev_s *dev = NULL;
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bool start = false;
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bool stop = false;
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int ret = OK;
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int tmp = 0;
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priv = (FAR struct bmi270_sensor_s *)lower;
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dev = priv->dev;
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nxmutex_lock(&dev->lock);
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tmp = (dev->priv[BMI270_ACCEL_IDX].enabled +
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dev->priv[BMI270_GYRO_IDX].enabled);
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if (enable && tmp == 0)
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{
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/* One time start */
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start = true;
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}
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else if (!enable && tmp == 1)
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{
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/* One time stop */
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stop = true;
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}
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priv->enabled = enable;
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nxmutex_unlock(&dev->lock);
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if (start)
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{
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/* Set normal mode */
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bmi270_set_normal_imu(&priv->base);
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#ifdef CONFIG_SENSORS_BMI270_POLL
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priv->last_update = sensor_get_timestamp();
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/* Wake up the thread */
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nxsem_post(&dev->run);
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#endif
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}
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else if (stop)
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{
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/* Disable acquisition of acc and gyro */
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bmi270_putreg8(&priv->base, BMI270_PWR_CTRL, 0);
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up_mdelay(30);
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}
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return ret;
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}
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/****************************************************************************
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* Name: bmi270_set_interval
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****************************************************************************/
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static int bmi270_set_interval(FAR struct sensor_lowerhalf_s *lower,
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FAR struct file *filep,
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FAR unsigned long *interval)
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{
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#ifdef CONFIG_SENSORS_BMI270_POLL
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FAR struct bmi270_sensor_s *priv = NULL;
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priv = (FAR struct bmi270_sensor_s *)lower;
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priv->interval = *interval;
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#endif
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return OK;
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}
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#ifndef CONFIG_SENSORS_BMI270_POLL
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/****************************************************************************
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* Name: bmi270_set_interval
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****************************************************************************/
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static int bmi270_fetch(FAR struct sensor_lowerhalf_s *lower,
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FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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FAR struct bmi270_sensor_s *priv = NULL;
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int16_t data[3];
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int ret = OK;
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priv = (FAR struct bmi270_sensor_s *)lower;
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switch (lower->type)
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{
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case SENSOR_TYPE_ACCELEROMETER:
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{
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struct sensor_accel accel;
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bmi270_getregs(&priv->base, BMI270_DATA_8,
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(FAR uint8_t *)data, 6);
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accel.timestamp = sensor_get_timestamp();
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accel.x = data[0] * priv->scale;
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accel.y = data[1] * priv->scale;
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accel.z = data[2] * priv->scale;
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memcpy(buffer, &accel, sizeof(accel));
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ret = sizeof(accel);
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break;
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}
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case SENSOR_TYPE_GYROSCOPE:
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{
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struct sensor_gyro gyro;
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bmi270_getregs(&priv->base, BMI270_DATA_14,
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(FAR uint8_t *)data, 6);
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gyro.timestamp = sensor_get_timestamp();
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gyro.x = data[0] * priv->scale;
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gyro.y = data[1] * priv->scale;
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gyro.z = data[2] * priv->scale;
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memcpy(buffer, &gyro, sizeof(gyro));
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ret = sizeof(gyro);
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break;
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}
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default:
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{
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ret = -EINVAL;
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break;
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}
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}
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return ret;
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}
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#endif
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/****************************************************************************
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* Name: bmi270_cotrol
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****************************************************************************/
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static int bmi270_control(FAR struct sensor_lowerhalf_s *lower,
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FAR struct file *filep, int cmd,
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unsigned long arg)
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{
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FAR struct bmi270_sensor_s *priv = NULL;
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int ret = OK;
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priv = (FAR struct bmi270_sensor_s *)lower;
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switch (cmd)
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{
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/* Set full scale command */
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case SNIOC_SET_SCALE_XL:
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{
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if (priv->lower.type == SENSOR_TYPE_GYROSCOPE)
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{
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ret = bmi270_gyro_scale(priv, arg);
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}
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else if (priv->lower.type == SENSOR_TYPE_ACCELEROMETER)
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{
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ret = bmi270_accel_scale(priv, arg);
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}
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break;
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}
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default:
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{
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snerr("ERROR: Unrecognized cmd: %d\n", cmd);
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ret = -ENOTTY;
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break;
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}
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}
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return ret;
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}
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/****************************************************************************
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* Name: bmi270_midpoint
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*
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* Description:
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* Find the midpoint between two numbers.
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*
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****************************************************************************/
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static uint32_t bmi270_midpoint(uint32_t a, uint32_t b)
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{
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return (uint32_t)(((uint64_t)a +
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(uint64_t)b + (uint64_t)1) / (uint64_t)2);
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}
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/****************************************************************************
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* Name: bmi270_accel_scale
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****************************************************************************/
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static int bmi270_accel_scale(FAR struct bmi270_sensor_s *priv,
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uint8_t scale)
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{
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int ret = OK;
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if (scale < bmi270_midpoint(2, 4))
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{
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bmi270_putreg8(&priv->base, BMI270_ACC_RANGE, ACCEL_RANGE_2G);
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priv->scale = CONSTANTS_ONE_G / 16384.f;
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}
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else if (scale < bmi270_midpoint(4, 8))
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{
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bmi270_putreg8(&priv->base, BMI270_ACC_RANGE, ACCEL_RANGE_4G);
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priv->scale = CONSTANTS_ONE_G / 8192.f;
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}
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else if (scale < bmi270_midpoint(8, 16))
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{
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bmi270_putreg8(&priv->base, BMI270_ACC_RANGE, ACCEL_RANGE_8G);
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priv->scale = CONSTANTS_ONE_G / 4096.f;
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}
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else
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{
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bmi270_putreg8(&priv->base, BMI270_ACC_RANGE, ACCEL_RANGE_16G);
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priv->scale = CONSTANTS_ONE_G / 2048.f;
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}
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return ret;
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}
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/****************************************************************************
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* Name: bmi270_gyro_scale
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****************************************************************************/
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static int bmi270_gyro_scale(FAR struct bmi270_sensor_s *priv,
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uint16_t scale)
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{
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int ret = OK;
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if (scale < bmi270_midpoint(125, 250))
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{
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bmi270_putreg8(&priv->base, BMI270_GYR_RANGE, GYRO_RANGE_125);
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priv->scale = (M_PI / 180.0f) * 125.f / 32768.f;
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}
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else if (scale < bmi270_midpoint(250, 500))
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{
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bmi270_putreg8(&priv->base, BMI270_GYR_RANGE, GYRO_RANGE_250);
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priv->scale = (M_PI / 180.0f) * 250.f / 32768.f;
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}
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else if (scale < bmi270_midpoint(500, 1000))
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{
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bmi270_putreg8(&priv->base, BMI270_GYR_RANGE, GYRO_RANGE_500);
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priv->scale = (M_PI / 180.0f) * 500.f / 32768.f;
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}
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else if (scale < bmi270_midpoint(1000, 2000))
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{
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bmi270_putreg8(&priv->base, BMI270_GYR_RANGE, GYRO_RANGE_1000);
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priv->scale = (M_PI / 180.0f) * 1000.f / 32768.f;
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}
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else
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{
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bmi270_putreg8(&priv->base, BMI270_GYR_RANGE, GYRO_RANGE_2000);
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priv->scale = (M_PI / 180.0f) * 2000.f / 32768.f;
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}
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return ret;
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}
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#ifdef CONFIG_SENSORS_BMI270_POLL
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/****************************************************************************
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* Name: bmi270_accel_data
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*
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* Description:
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* Get and push accel data from struct sensor_data_s
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*
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* Parameter:
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* priv - Internal private lower half driver instance
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* buf - Point to data
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*
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* Return:
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* OK - on success
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*
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****************************************************************************/
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static void bmi270_accel_data(FAR struct bmi270_sensor_s *priv,
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FAR int16_t *buf)
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{
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FAR struct sensor_lowerhalf_s *lower = &priv->lower;
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struct sensor_accel accel;
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uint64_t now = sensor_get_timestamp();
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if (!priv->enabled || now - priv->last_update < priv->interval)
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{
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return;
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}
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priv->last_update = now;
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accel.timestamp = now;
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accel.x = buf[0] * priv->scale;
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accel.y = buf[1] * priv->scale;
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accel.z = buf[2] * priv->scale;
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accel.temperature = 0;
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lower->push_event(lower->priv, &accel, sizeof(accel));
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}
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/****************************************************************************
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* Name: bmi270_gyro_data
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*
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* Description:
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* Get and push gyro data from struct sensor_data_s
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*
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* Parameter:
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* priv - Internal private lower half driver instance
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* buf - Point to data
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*
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* Return:
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* OK - on success
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*
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****************************************************************************/
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static void bmi270_gyro_data(FAR struct bmi270_sensor_s *priv,
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FAR int16_t *buf)
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{
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FAR struct sensor_lowerhalf_s *lower = &priv->lower;
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struct sensor_gyro gyro;
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uint64_t now = sensor_get_timestamp();
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if (!priv->enabled || now - priv->last_update < priv->interval)
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{
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return;
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}
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priv->last_update = now;
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gyro.timestamp = now;
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gyro.x = buf[0] * priv->scale;
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gyro.y = buf[1] * priv->scale;
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gyro.z = buf[2] * priv->scale;
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gyro.temperature = 0;
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lower->push_event(lower->priv, &gyro, sizeof(gyro));
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}
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/****************************************************************************
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* Name: bmi270_thread
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*
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* Description:
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* Thread for performing interval measurement cycle and data read.
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*
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* Parameter:
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* argc - Number opf arguments
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* argv - Pointer to argument list
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*
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****************************************************************************/
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static int bmi270_thread(int argc, FAR char **argv)
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{
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FAR struct bmi270_sensor_dev_s *dev
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= (FAR struct bmi270_sensor_dev_s *)((uintptr_t)strtoul(argv[1], NULL,
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16));
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FAR struct bmi270_sensor_s *accel = &dev->priv[BMI270_ACCEL_IDX];
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FAR struct bmi270_sensor_s *gyro = &dev->priv[BMI270_GYRO_IDX];
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unsigned long min_interval;
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int16_t data[6];
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int ret;
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while (true)
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{
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if ((!accel->enabled) && (!gyro->enabled))
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{
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/* Waiting to be woken up */
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ret = nxsem_wait(&dev->run);
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if (ret < 0)
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{
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continue;
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}
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}
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/* Get data */
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bmi270_getregs(&gyro->base, BMI270_DATA_8, (FAR uint8_t *)data, 12);
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/* Read accel */
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if (accel->enabled)
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{
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bmi270_accel_data(accel, data);
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}
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/* Read gyro */
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if (gyro->enabled)
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{
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bmi270_gyro_data(gyro, &data[3]);
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}
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/* Sleeping thread before fetching the next sensor data */
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min_interval = MIN(accel->interval, gyro->interval);
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nxsig_usleep(min_interval);
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}
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return OK;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: bmi270_register_uorb
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*
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* Description:
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* Register the BMI270 IMU as sensor device
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*
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* Input Parameters:
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* devno - Instance number for driver
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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#ifdef CONFIG_SENSORS_BMI270_I2C
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int bmi270_register_uorb(int devno, FAR struct i2c_master_s *i2c,
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uint8_t addr)
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#else /* CONFIG_SENSORS_BMI270_SPI */
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int bmi270_register_uorb(int devno, FAR struct spi_dev_s *spi)
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#endif
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{
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FAR struct bmi270_sensor_dev_s *dev = NULL;
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FAR struct bmi270_sensor_s *tmp = NULL;
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#ifdef CONFIG_SENSORS_BMI270_POLL
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FAR char *argv[2];
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char arg1[32];
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#endif
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int ret = OK;
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/* Initialize the device structure. */
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dev = (FAR struct bmi270_sensor_dev_s *)kmm_malloc(sizeof(*dev));
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if (dev == NULL)
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{
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snerr("ERROR: Failed to allocate instance\n");
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return -ENOMEM;
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}
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memset(dev, 0, sizeof(*dev));
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nxmutex_init(&dev->lock);
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#ifdef CONFIG_SENSORS_BMI270_POLL
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nxsem_init(&dev->run, 0, 0);
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#endif
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/* Accelerometer register */
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tmp = &dev->priv[BMI270_ACCEL_IDX];
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tmp->dev = dev;
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#ifdef CONFIG_SENSORS_BMI270_I2C
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tmp->base.i2c = i2c;
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tmp->base.addr = addr;
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#else
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tmp->base.spi = spi;
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#endif
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tmp->lower.ops = &g_sensor_ops;
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tmp->lower.type = SENSOR_TYPE_ACCELEROMETER;
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tmp->lower.nbuffer = 1;
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#ifdef CONFIG_SENSORS_BMI270_POLL
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tmp->enabled = false;
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tmp->interval = CONFIG_SENSORS_BMI270_POLL_INTERVAL;
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#endif
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ret = sensor_register(&tmp->lower, devno);
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if (ret < 0)
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{
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snerr("sensor_register failed: %d\n", ret);
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goto gyro_err;
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}
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/* Gyroscope register */
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tmp = &dev->priv[BMI270_GYRO_IDX];
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tmp->dev = dev;
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#ifdef CONFIG_SENSORS_BMI270_I2C
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tmp->base.i2c = i2c;
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tmp->base.addr = addr;
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#else
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tmp->base.spi = spi;
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#endif
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tmp->lower.ops = &g_sensor_ops;
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tmp->lower.type = SENSOR_TYPE_GYROSCOPE;
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tmp->lower.nbuffer = 1;
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#ifdef CONFIG_SENSORS_BMI270_POLL
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tmp->enabled = false;
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tmp->interval = CONFIG_SENSORS_BMI270_POLL_INTERVAL;
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#endif
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ret = sensor_register(&tmp->lower, devno);
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if (ret < 0)
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{
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snerr("sensor_register failed: %d\n", ret);
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goto gyro_err;
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}
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#ifdef CONFIG_SENSORS_BMI270_SPI
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/* BMI270 detects communication bus is SPI by rising edge of CS. */
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bmi270_getreg8(&tmp->base, 0x00);
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bmi270_getreg8(&tmp->base, 0x00);
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up_udelay(200);
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#endif
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/* Initialization sequence */
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ret = bmi270_init_seq(&tmp->base);
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if (ret != 0)
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{
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return ret;
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}
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/* Set default scale */
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bmi270_accel_scale(&dev->priv[BMI270_ACCEL_IDX], 2);
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bmi270_gyro_scale(&dev->priv[BMI270_GYRO_IDX], 2000);
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#ifdef CONFIG_SENSORS_BMI270_POLL
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/* Create thread for polling sensor data */
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snprintf(arg1, 16, "%p", dev);
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argv[0] = arg1;
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argv[1] = NULL;
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ret = kthread_create("bmi270_thread", SCHED_PRIORITY_DEFAULT,
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CONFIG_SENSORS_BMI270_THREAD_STACKSIZE,
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bmi270_thread,
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argv);
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if (ret < 0)
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{
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goto thr_err;
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}
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#endif
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return ret;
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#ifdef CONFIG_SENSORS_BMI270_POLL
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thr_err:
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#endif
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#ifdef AUX_MAG_SUPPORTED
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sensor_unregister(&dev->priv[BMI270_MAG_IDX].lower, devno);
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mag_err:
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#endif
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sensor_unregister(&dev->priv[BMI270_GYRO_IDX].lower, devno);
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gyro_err:
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sensor_unregister(&dev->priv[BMI270_ACCEL_IDX].lower, devno);
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kmm_free(dev);
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return ret;
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}
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