456 lines
11 KiB
C++
456 lines
11 KiB
C++
/*
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* File : bmi055_sensor.cpp
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2014, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2015-1-11 RT_learning the first version
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*/
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#include <string.h>
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#include <stdio.h>
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#include <rtdevice.h>
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#include "bmi055_sensor.h"
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const static sensor_t _BMI055_sensor[] =
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{
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{
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.name = "Accelerometer",
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.vendor = "Bosch",
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.version = sizeof(sensor_t),
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.handle = 0,
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.type = SENSOR_TYPE_ACCELEROMETER,
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.maxRange = SENSOR_ACCEL_RANGE_16G,
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.resolution = 1.0f,
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.power = 0.5f,
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.minDelay = 10000,
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.fifoReservedEventCount = 0,
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.fifoMaxEventCount = 64,
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},
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{
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.name = "Gyroscope",
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.vendor = "Bosch",
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.version = sizeof(sensor_t),
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.handle = 0,
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.type = SENSOR_TYPE_GYROSCOPE,
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.maxRange = SENSOR_GYRO_RANGE_2000DPS,
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.resolution = 1.0f,
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.power = 0.5f,
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.minDelay = 10000,
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.fifoReservedEventCount = 0,
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.fifoMaxEventCount = 64,
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}
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};
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BMI055::BMI055(int sensor_type, const char* iic_bus, int addr)
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: SensorBase(sensor_type)
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{
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this->i2c_bus = (struct rt_i2c_bus_device *)rt_device_find(iic_bus);
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if (this->i2c_bus == NULL)
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{
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printf("BMI055: No IIC device:%s\n", iic_bus);
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return;
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}
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this->i2c_addr = addr;
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/* register to sensor manager */
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SensorManager::registerSensor(this);
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}
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int BMI055::read_reg(rt_uint8_t reg, rt_uint8_t *value)
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{
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struct rt_i2c_msg msgs[2];
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msgs[0].addr = this->i2c_addr;
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msgs[0].flags = RT_I2C_WR;
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msgs[0].buf = ®
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msgs[0].len = 1;
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msgs[1].addr = this->i2c_addr;
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msgs[1].flags = RT_I2C_RD; /* Read from slave */
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msgs[1].buf = (rt_uint8_t *)value;
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msgs[1].len = 1;
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if (rt_i2c_transfer(this->i2c_bus, msgs, 2) == 2)
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return RT_EOK;
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return -RT_ERROR;
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}
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int BMI055::read_buffer(rt_uint8_t reg, rt_uint8_t* value, rt_size_t size)
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{
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struct rt_i2c_msg msgs[2];
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msgs[0].addr = this->i2c_addr;
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msgs[0].flags = RT_I2C_WR;
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msgs[0].buf = ®
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msgs[0].len = 1;
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msgs[1].addr = this->i2c_addr;
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msgs[1].flags = RT_I2C_RD; /* Read from slave */
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msgs[1].buf = (rt_uint8_t *)value;
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msgs[1].len = size;
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if (rt_i2c_transfer(this->i2c_bus, msgs, 2) == 2)
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return RT_EOK;
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return -RT_ERROR;
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}
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int BMI055::write_reg(rt_uint8_t reg, rt_uint8_t value)
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{
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struct rt_i2c_msg msgs[2];
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msgs[0].addr = this->i2c_addr;
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msgs[0].flags = RT_I2C_WR;
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msgs[0].buf = ®
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msgs[0].len = 1;
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msgs[1].addr = this->i2c_addr;
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msgs[1].flags = RT_I2C_WR | RT_I2C_NO_START;
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msgs[1].buf = (rt_uint8_t *)&value;
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msgs[1].len = 1;
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if (rt_i2c_transfer(this->i2c_bus, msgs, 2) == 2)
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return RT_EOK;
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return -RT_ERROR;
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}
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BMI055_Accelerometer::BMI055_Accelerometer(const char* iic_name, int addr)
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: BMI055(SENSOR_TYPE_ACCELEROMETER, iic_name, addr)
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{
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int index;
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uint8_t id;
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rt_uint8_t value[6] = {0};
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rt_int32_t x, y, z;
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SensorConfig config = {SENSOR_MODE_NORMAL, SENSOR_DATARATE_400HZ, SENSOR_ACCEL_RANGE_2G};
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write_reg(BMI055_BGW_SOFTRESET, 0xB6); /* reset of the sensor P57 */
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write_reg(BMI055_PMU_LPW, 0x00); /* PMU_LPW NORMAL mode P55 */
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write_reg(BMI055_PMU_BW, 0x0A); /* 01010b 31.25 Hz P55 */
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write_reg(BMI055_PMU_RANGE, 0x05); /* 0101b ±4g range PMU_RANGE set acc +-4g/s P54 */
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x_offset = y_offset = z_offset = 0;
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x = y = z = 0;
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/* read BMI055 id */
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read_buffer(BMI055_ACC_BGW_CHIPID, &id, 1); /* BGW_CHIPID P47*/
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if (id != BMI055_ACC_BGW_CHIPID_VALUE)
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{
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printf("Warning: not found BMI055 id: %02x\n", id);
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}
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/* get offset */
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for (index = 0; index < 200; index ++)
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{
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read_buffer(BMI055_ACCD_X_LSB, value, 6); /*ACCD_X_LSB P47 */
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x += (((rt_int16_t)value[1] << 8) | value[0]);
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y += (((rt_int16_t)value[3] << 8) | value[2]);
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z += (((rt_int16_t)value[5] << 8) | value[4]);
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}
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x_offset = x / 200;
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y_offset = y / 200;
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z_offset = z / 200;
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this->enable = RT_FALSE;
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this->sensitivity = SENSOR_ACCEL_SENSITIVITY_2G;
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this->config = config;
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}
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int
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BMI055_Accelerometer::configure(SensorConfig *config)
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{
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int range;
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uint8_t value;
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if (config == RT_NULL) return -1;
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/* TODO: set datarate */
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/* get range and calc the sensitivity */
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range = config->range.accel_range;
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switch (range)
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{
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case SENSOR_ACCEL_RANGE_2G:
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this->sensitivity = SENSOR_ACCEL_SENSITIVITY_2G;
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range = 0x03; //0011b
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break;
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case SENSOR_ACCEL_RANGE_4G:
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this->sensitivity = SENSOR_ACCEL_SENSITIVITY_4G;
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range = 0x05; //0101b
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break;
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case SENSOR_ACCEL_RANGE_8G:
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this->sensitivity = SENSOR_ACCEL_SENSITIVITY_8G;
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range = 0x01 << 3; //1000b
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break;
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case SENSOR_ACCEL_RANGE_16G:
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this->sensitivity = SENSOR_ACCEL_SENSITIVITY_16G;
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range = 0x03 << 2; //1100b
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break;
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default:
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return -1;
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}
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/* set range to sensor */
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read_reg(BMI055_PMU_RANGE, &value); /* PMU_RANGE P54 */
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value &= 0xF0;
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value |= range;
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write_reg(BMI055_PMU_RANGE, value);
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return 0;
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}
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int
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BMI055_Accelerometer::activate(int enable)
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{
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uint8_t value;
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if (enable && this->enable == RT_FALSE)
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{
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/* enable accelerometer */
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read_reg(BMI055_PMU_LPW, &value); /* P55 */
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value &= ~(0x07 << 7);
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write_reg(BMI055_PMU_LPW, value);
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}
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if (!enable && this->enable == RT_TRUE)
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{
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/* disable accelerometer */
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read_reg(BMI055_PMU_LPW, &value);
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value &= ~(0x07 << 7);
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value |= (0x01 << 7);
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write_reg(BMI055_PMU_LPW, value);
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}
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if (enable) this->enable = RT_TRUE;
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else this->enable = RT_FALSE;
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return 0;
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}
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int
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BMI055_Accelerometer::poll(sensors_event_t *event)
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{
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rt_uint8_t value[6];
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rt_int16_t x, y, z;
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/* parameters check */
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if (event == NULL) return -1;
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/* get event data */
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event->version = sizeof(sensors_event_t);
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event->sensor = (int32_t) this;
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event->timestamp = rt_tick_get();
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event->type = SENSOR_TYPE_ACCELEROMETER;
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read_buffer(0x02, value, 6);
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/* get raw data */
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x = (((rt_int16_t)value[1] << 8) | value[0]);
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y = (((rt_int16_t)value[3] << 8) | value[2]);
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z = (((rt_int16_t)value[5] << 8) | value[4]);
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if (config.mode == SENSOR_MODE_RAW)
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{
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event->raw_acceleration.x = x;
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event->raw_acceleration.y = y;
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event->raw_acceleration.z = z;
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}
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else
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{
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x -= x_offset; y -= y_offset; z -= z_offset;
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event->acceleration.x = x * this->sensitivity * SENSORS_GRAVITY_STANDARD;
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event->acceleration.y = y * this->sensitivity * SENSORS_GRAVITY_STANDARD;
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event->acceleration.z = z * this->sensitivity * SENSORS_GRAVITY_STANDARD;
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}
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return 0;
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}
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void
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BMI055_Accelerometer::getSensor(sensor_t *sensor)
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{
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/* get sensor description */
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if (sensor)
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{
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memcpy(sensor, &_BMI055_sensor[0], sizeof(sensor_t));
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}
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}
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BMI055_Gyroscope::BMI055_Gyroscope(const char* iic_name, int addr)
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: BMI055(SENSOR_TYPE_GYROSCOPE, iic_name, addr)
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{
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int index;
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uint8_t id;
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rt_uint8_t value[6];
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rt_int32_t x, y, z;
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/* initialize BMI055 */
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write_reg(BMI055_MODE_LPM1_ADDR, 0x00); /* normal mode */
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write_reg(BMI055_MODE_LPM2_ADDR, 0x80); /* fast powerup */
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write_reg(BMI055_BW_ADDR, 0x03); /* ODR:400Hz Filter Bandwidth:47Hz */
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write_reg(BMI055_RANGE_ADDR, 0x00); /* 2000dps */
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x_offset = y_offset = z_offset = 0;
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x = y = z = 0;
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/* read BMI055 id */
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read_buffer(BMI055_CHIP_ID_ADDR, &id, 1);
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if (id != BMI055_GRRO_CHIP_ID)
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{
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printf("Warning: not found BMI055 id: %02x\n", id);
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}
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/* get offset */
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for (index = 0; index < 200; index ++)
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{
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read_buffer(BMI055_RATE_X_LSB_ADDR, value, 6);
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x += (((rt_int16_t)value[1] << 8) | value[0]);
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y += (((rt_int16_t)value[3] << 8) | value[2]);
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z += (((rt_int16_t)value[5] << 8) | value[4]);
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}
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x_offset = x / 200;
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y_offset = y / 200;
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z_offset = z / 200;
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this->enable = RT_FALSE;
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this->sensitivity = SENSOR_GYRO_SENSITIVITY_250DPS;
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}
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int
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BMI055_Gyroscope::configure(SensorConfig *config)
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{
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int range;
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uint8_t value;
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if (config == RT_NULL) return -1;
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/* TODO: set datarate */
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/* get range and calc the sensitivity */
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range = config->range.gyro_range;
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switch (range)
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{
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//to do add more range e.g 125DPS
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//case
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case SENSOR_GYRO_RANGE_250DPS:
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this->sensitivity = SENSOR_GYRO_SENSITIVITY_250DPS;
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range = 0x11;
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break;
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case SENSOR_GYRO_RANGE_500DPS:
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this->sensitivity = SENSOR_GYRO_SENSITIVITY_500DPS;
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range = 0x10;
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break;
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case SENSOR_GYRO_RANGE_1000DPS:
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this->sensitivity = SENSOR_GYRO_SENSITIVITY_1000DPS;
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range = 0x01;
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break;
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case SENSOR_GYRO_RANGE_2000DPS:
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this->sensitivity = SENSOR_GYRO_SENSITIVITY_2000DPS;
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range = 0x00;
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break;
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default:
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return -1;
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}
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/* set range to sensor */
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read_reg(BMI055_RANGE_ADDR, &value);
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value &= ~0x07;
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value |= range;
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write_reg(BMI055_RANGE_ADDR, value);
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return 0;
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}
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int
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BMI055_Gyroscope::activate(int enable)
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{
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uint8_t value;
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if (enable && this->enable == RT_FALSE)
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{
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/* enable gyroscope */
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read_reg(BMI055_MODE_LPM1_ADDR, &value);
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value &= ~(0x1010 << 4); //{0; 0} NORMAL mode
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write_reg(BMI055_MODE_LPM1_ADDR, value); //P101 NORMAL mode
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}
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if (!enable && this->enable == RT_TRUE)
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{
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/* disable gyroscope */
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read_reg(BMI055_MODE_LPM1_ADDR, &value);
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value &= ~(0x01 << 5); //set bit5 deep_suspend 0
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value |= (0x01 << 7); //set bit1 suspend 1
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write_reg(BMI055_MODE_LPM1_ADDR, value); //{1; 0} SUSPEND mode
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}
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if (enable) this->enable = RT_TRUE;
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else this->enable = RT_FALSE;
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return 0;
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}
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int
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BMI055_Gyroscope::poll(sensors_event_t *event)
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{
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rt_uint8_t value[6];
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rt_int16_t x, y, z;
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/* parameters check */
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if (event == NULL) return -1;
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/* get event data */
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event->version = sizeof(sensors_event_t);
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event->sensor = (int32_t) this;
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event->timestamp = rt_tick_get();
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event->type = SENSOR_TYPE_GYROSCOPE;
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read_buffer(BMI055_RATE_X_LSB_ADDR, value, 6);
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/* get raw data */
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x = (((rt_int16_t)value[1] << 8) | value[0]);
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y = (((rt_int16_t)value[3] << 8) | value[2]);
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z = (((rt_int16_t)value[5] << 8) | value[4]);
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if (config.mode == SENSOR_MODE_RAW)
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{
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event->raw_gyro.x = x;
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event->raw_gyro.y = y;
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event->raw_gyro.z = z;
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}
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else
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{
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x -= x_offset; y -= y_offset; z -= z_offset;
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event->gyro.x = x * this->sensitivity * SENSORS_DPS_TO_RADS;
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event->gyro.y = y * this->sensitivity * SENSORS_DPS_TO_RADS;
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event->gyro.z = z * this->sensitivity * SENSORS_DPS_TO_RADS;
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}
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return 0;
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}
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void
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BMI055_Gyroscope::getSensor(sensor_t *sensor)
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{
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/* get sensor description */
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if (sensor)
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{
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memcpy(sensor, &_BMI055_sensor[1], sizeof(sensor_t));
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}
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}
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