Bosch BMA020 3-axis accelerometer.
This file contains functions for initializing and reading data from a Bosch BMA020 3-axis accelerometer.
Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
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| static bool | bma020_device_id (sensor_hal_t *hal, sensor_data_t *data) |
| Read accelerometer device ID and revision numbers. More... | |
| static bool | bma020_get_accel (sensor_hal_t *hal, sensor_data_t *data) |
| Read accelerometer vector data. More... | |
| bool | bma020_init (sensor_t *sensor, int resvd) |
| Bosch BMA020 accelerometer driver initialization. More... | |
| static bool | bma020_ioctl (sensor_t *sensor, sensor_command_t cmd, void *arg) |
| BMA020 ioctl control entry point. More... | |
| static bool | bma020_read (sensor_t *sensor, sensor_read_t type, sensor_data_t *data) |
| Read sensor data. More... | |
| static bool | bma020_set_bandwidth (sensor_hal_t *hal, int16_t band) |
| Set the BMA020 ADC output data bandwidth. More... | |
| static bool | bma020_set_range (sensor_hal_t *hal, int16_t range) |
| Set the BMA020 full scale acceleration range. More... | |
Variables | |
| static const sensor_map_t | band_table [] |
| Bosch BMA020 Bandwidth Table (hertz, register value) More... | |
| static const sensor_map_t | range_table [] |
| Bosch BMA020 Range Table (milli-g, register value) More... | |
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Read accelerometer device ID and revision numbers.
This function reads the accelerometer hardware identification registers and returns these values in the specified data structure.
| hal | Address of an initialized sensor hardware descriptor. |
| data | Address of sensor_data_t structure to return values. |
References BMA020_CHIP_ID, BMA020_CHIP_VERSION, sensor_data_t::device, and sensor_bus_get.
Referenced by bma020_read().
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Read accelerometer vector data.
This function obtains accelerometer data for all three axes of the Bosch device. The data is read from six device registers using a multi-byte bus transfer. The 10-bit raw results are then assembled from the two register values for each axis, including extending the sign bit, to form a signed 32-bit value.
Along with the actual sensor data, the LSB byte contains a "new" flag indicating if the data for this axis has been updated since the last time the axis data was read. Reading either LSB or MSB data will clear this flag.
| hal | Address of an initialized sensor hardware descriptor. |
| data | The address of a vector storing sensor axis data. |
References sensor_hal::burst_addr, and sensor_bus_read.
Referenced by bma020_ioctl(), and bma020_read().
Bosch BMA020 accelerometer driver initialization.
This is the main initialization function for the BMA020 device. The accelerometer range and bandwidth are set based on user-specified values from the system configuration.
| sensor | Address of a sensor device descriptor. |
| resvd | Reserved value. |
References ARRAYSIZE, band_table, sensor_hal::bandwidth, BMA020_ACC_X_LSB, BMA020_CHIP_ID, BMA020_DATA_RESOLUTION, BMA020_ID_VAL, bma020_ioctl(), bma020_read(), bma020_set_bandwidth(), bma020_set_range(), sensor_hal::burst_addr, sensor_hal::bus, sensor_desc::drv, sensor_device_t::func, sensor_desc::hal, sensor_hal::range, range_table, sensor_funcs_t::read, sensor_hal::resolution, sensor_bus_get, SENSOR_CAPS_3_AXIS, SENSOR_CAPS_HI_G_EVENT, SENSOR_CAPS_LO_G_EVENT, SENSOR_CAPS_SELFTEST, SENSOR_SCALE_milli, SENSOR_UNITS_g0, SENSOR_VENDOR_BOSCH, status, bus_desc_t::status, and STATUS_OK.
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BMA020 ioctl control entry point.
| hal | Address of an initialized sensor device descriptor. |
| cmd | Command to execute |
| arg | Argument for command (varies) |
References sensor_data_t::axis, bma020_get_accel(), bma020_set_bandwidth(), bma020_set_range(), sensor_desc::err, sensor_desc::hal, sensor_data_t::scaled, SENSOR_ERR_UNSUPPORTED, SENSOR_READ_VECTOR, SENSOR_SET_BANDWIDTH, SENSOR_SET_RANGE, vector3_t::x, vector3_t::y, and vector3_t::z.
Referenced by bma020_init().
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Read sensor data.
This routine calls the appropriate internal data function to obtain the specified type of data from the sensor device.
| sensor | Address of an initialized sensor device descriptor. |
| type | Type of sensor data to read. |
| data | The address where data values are returned. |
References bma020_device_id(), bma020_get_accel(), sensor_desc::err, sensor_desc::hal, SENSOR_ERR_FUNCTION, SENSOR_READ_ACCELERATION, and SENSOR_READ_ID.
Referenced by bma020_init().
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Set the BMA020 ADC output data bandwidth.
| hal | Address of an initialized sensor hardware descriptor. |
| band | The index of a driver-specific bandwidth table entry. |
References BMA020_CTRL4, CTRL4_BANDWIDTH, sensor_bus_get, and sensor_bus_put.
Referenced by bma020_init(), and bma020_ioctl().
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Set the BMA020 full scale acceleration range.
| hal | Address of an initialized sensor hardware descriptor. |
| range | The index of a driver-specific range table entry. |
References BMA020_CTRL4, CTRL4_RANGE, sensor_bus_get, and sensor_bus_put.
Referenced by bma020_init(), and bma020_ioctl().
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Bosch BMA020 Bandwidth Table (hertz, register value)
Referenced by bma020_init().
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1.8.5