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name="TheT-watch2020Hardware" |
The driver for BMA423 Triaxial Acceleration Sensor |
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< | I found that MicroPython layer in bma423 from https://github.com/OPHoperHPO/lilygo-ttgo-twatch-2020-micropython  because it uses deprecated calls to I2C in MicroPython. |
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> | The MicroPython layer in bma423 from https://github.com/OPHoperHPO/lilygo-ttgo-twatch-2020-micropython was not working because it uses deprecated calls to I2C in MicroPython. |
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< | However, I found that Daniel Thomson has also written a MicroPython interface to the BMA423 API from Bosch SensorTec, which was easier to adapt to the t-watch. |
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> | However, I found that Daniel Thomson has also written a MicroPython interface to the BMA423 API from Bosch SensorTec, which was easier to adapt to the t-watch. |
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https://github.com/daniel-thompson/bma42x-upy |
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Daniel also supplies a few example programs, which are essentially ports of the Bosch examples ported from C to MicroPython |
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< | The BMA42X driver uses the |
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> | The BMA42X driver provides the following methods: |
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- BMA42X(i2c): create a BMA42X object. The i2c parameter must be a initialized SoftI2C object
- debug(on_off): switch debugging on / off
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- feature_enable
- get_offset_comp
- get_temperature(unit): unit may be
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- feature_enable(feature,on_off): feature: the feature to be enabled or disabled, on_off to switch the feature on or off. The features are listed below.
- get_offset_comp(): Gets the status of the accel offset compensation
- get_temperature(unit): gets the temperature in the requested units. Possible units: see below
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- init (called when the object is created)
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- map_interrupt
- read_accel_xyz
- read_int_status
- set accel_config
- reset_step_counter
- set accel_enable
- set_any_mot_config
- set_no_mot_config
- set_command_reg
- set_offset_comp
- step_detector_enable
- step_counter_output
- step_counter_set_watermark
- write_config_file
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- map_interrupt(int_line, interrupt_types): Map the interrupt to either pin1 or pin2
- read_accel_xyz(): read the accel data for x,y,z from the sensor. The data are returned as a tuple (x,y,z)
- read_int_status(): reads the hardware interrupt status from the sensor
- set accel_config(accel_config): set the acceleration sensor config. See the accelerometer.py example in order to understand how to do this.
- reset_step_counter(): reset the step counter
- set accel_enable(on_off): enables or disables the accel in the sensor
- set_any_mot_config(any_mot_config): set the configuration for any motion interrupts. See example motion_interrupt.py in order to understand how to do this.
- set_no_mot_config(no_mot_config): set the configuration for no motion interrupts. See example motion_interrupt.py in order to understand how to do this.
- set_command_reg(value): set the command register
- 0xb6: triggers a soft reset
- 0xb0: clears all data in the FiFo
- 0xf0: resets the acceleration data path
- set_offset_comp(on_off): enables the offset compensation for filtered and unfiltered accel data
- step_detector_enable(on_off): enables or disables the step detector feature in the sensor
- step_counter_output(): gets the number of counted steps of the step counter feature from the sensor
- step_counter_set_watermark(value): sets the watermark level for step counter interrupt in the sensor
- write_config_file(): write the binary configuration data to the sensor
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| | The driver also defines the following constants:
The registers: |
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> | Features |
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> | Interrupts |
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- INTR1_MAP
- INTR2_MAP
- STEP_CNTR_INT
- ANY_MOT_INT
- NO_MOT_INT
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< | Constants to enable axis |
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> | Enable axis |
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- DIS_ALL_AXIS
- X_AXIS_EN
- Y_AXIS_EN
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