STK8BA58 3-Axis Accelerometer Sample

Get accelerometer data from an STK8BA58 sensor (polling & trigger mode).

Description

This sample application periodically reads accelerometer data from the STK8BA58 sensor and displays the sensor data on the console.

Requirements

This sample uses the STK8BA58, Sensortek MEMS system-in-package featuring a 3-axis accelerometer sensor with digital output.

References

Building and Running

The STK8BA58 sensor is unusual and only found on a few boards or shields. In Zephyr there is no hardware with this sensor yet. In Bridle only two variants of the The PicoBoy (Color) can be used:

Building on picoboy

The PicoBoy includes an STK8BA58, but doesn’t support the trigger mode. The interrupt line is not connected.

west build -b picoboy/rp2040 -p -d build/picoboy-stk8ba58 bridle/samples/stk8ba58
west flash -d build/picoboy-stk8ba58

Sample Output

[00:00:00.002,000] <dbg> STK8BA58: stk8ba58_init: stk8ba58@18: chip id 0x87
[00:00:00.003,000] <dbg> STK8BA58: stk8ba58_init: stk8ba58@18: pm: 7, odr: 5
[00:00:00.003,000] <dbg> STK8BA58: stk8ba58_set_odr: stk8ba58@18: set odr to 250 Hz, bw to 125 Hz
[00:00:00.005,000] <dbg> STK8BA58: stk8ba58_init: stk8ba58@18: range is 2
[00:00:00.006,000] <dbg> STK8BA58: stk8ba58_set_range: stk8ba58@18: set range to 2g, gain to 0.98 mg/LSB

***** delaying boot 4000ms (per build configuration) *****
[00:00:00.250,000] <wrn> udc_rpi: BUS RESET
[00:00:00.334,000] <wrn> udc_rpi: BUS RESET
*** Booting Zephyr OS build v4.1.0… (delayed boot 4000ms) ***

[00:00:04.009,000] <dbg> STK8BA58: stk8ba58_set_range: stk8ba58@18: set range to 8g, gain to 3.91 mg/LSB

Range at 80 m/s^2
Polling at 0.5 Hz
#1 @ 4009 ms: x 5.295395 , y -0.961051 , z -9.149213
#2 @ 6013 ms: x 5.372279 , y -0.941830 , z -9.197265
#3 @ 8015 ms: x 5.314616 , y -0.903388 , z -9.139602
#4 @ 10018 ms: x 5.391500 , y -0.980272 , z -9.312591
#5 @ 12020 ms: x 5.372279 , y -0.912999 , z -9.168433
#6 @ 14022 ms: x 5.324226 , y -0.912999 , z -9.178044
#7 @ 16025 ms: x 5.343447 , y -0.884167 , z -9.091549
#8 @ 18027 ms: x 5.314616 , y -1.037935 , z -9.110771
#9 @ 20029 ms: x 5.391500 , y -0.932220 , z -9.081939
#10 @ 22032 ms: x 5.314616 , y -0.932220 , z -9.235707
#11 @ 24034 ms: x 5.420332 , y -0.941830 , z -9.158823
#12 @ 26036 ms: x 5.372279 , y -0.816893 , z -9.129991
#13 @ 28039 ms: x 5.362668 , y -0.932220 , z -9.149213
#14 @ 30041 ms: x 5.295395 , y -0.941830 , z -9.216485
#15 @ 32043 ms: x 5.372279 , y -0.864946 , z -9.158823

Building on picoboy_color_plus

The PicoBoy Color Plus includes an STK8BA58 with connected interrupt line.

west build -b picoboy_color_plus/rp2350a/m33 -p -d build/picoboy-stk8ba58 bridle/samples/stk8ba58
west flash -d build/picoboy-stk8ba58

Sample Output

[00:00:00.001,000] <dbg> STK8BA58: stk8ba58_init: stk8ba58@18: chip id 0x87
[00:00:00.001,000] <dbg> STK8BA58: stk8ba58_trigger_init: stk8ba58@18: int on gpio@40028000.22
[00:00:00.001,000] <dbg> STK8BA58: stk8ba58_set_pm: stk8ba58@18: set pm to low-power, sleep 25ms
[00:00:00.001,000] <dbg> STK8BA58: stk8ba58_init: stk8ba58@18: pm: 7, odr: 5
[00:00:00.001,000] <dbg> STK8BA58: stk8ba58_set_odr: stk8ba58@18: set odr to 250 Hz, bw to 125 Hz
[00:00:00.002,000] <dbg> STK8BA58: stk8ba58_init: stk8ba58@18: range is 2
[00:00:00.002,000] <dbg> STK8BA58: stk8ba58_set_range: stk8ba58@18: set range to 2g, gain to 0.98 mg/LSB

***** delaying boot 4000ms (per build configuration) *****
[00:00:00.488,000] <wrn> udc_rpi: BUS RESET
[00:00:00.584,000] <wrn> udc_rpi: BUS RESET
*** Booting Zephyr OS build v4.1.0… (delayed boot 4000ms) ***

[00:00:04.004,000] <dbg> STK8BA58: stk8ba58_set_range: stk8ba58@18: set range to 8g, gain to 3.91 mg/LSB
[00:00:04.004,000] <dbg> STK8BA58: stk8ba58_set_odr: stk8ba58@18: set odr to 15.63 Hz, bw to 7.81 Hz
[00:00:04.004,000] <dbg> STK8BA58: stk8ba58_set_pm: stk8ba58@18: set pm to low-power, sleep 1000ms
[00:00:04.005,000] <dbg> STK8BA58: stk8ba58_init_interrupt: stk8ba58@18: int1: enable push-pull mode
[00:00:04.006,000] <dbg> STK8BA58: stk8ba58_init_interrupt: stk8ba58@18: int1: enable active-high polarity

Range at 80 m/s^2
Waiting for triggers
#1 @ 4116 ms: x -1.441577 , y 4.632269 , z -9.110771
#2 @ 4226 ms: x -1.460798 , y 4.613048 , z -9.139602
#3 @ 4335 ms: x -1.451188 , y 4.622658 , z -9.129991
#4 @ 4444 ms: x -1.451188 , y 4.632269 , z -9.110771
#5 @ 4554 ms: x -1.451188 , y 4.613048 , z -9.129991
#6 @ 4663 ms: x -1.441577 , y 4.613048 , z -9.120381
#7 @ 4772 ms: x -1.460798 , y 4.632269 , z -9.139602
#8 @ 4882 ms: x -1.460798 , y 4.622658 , z -9.120381
#9 @ 4991 ms: x -1.470409 , y 4.613048 , z -9.129991
#10 @ 5100 ms: x -1.451188 , y 4.613048 , z -9.139602
#11 @ 5209 ms: x -1.451188 , y 4.632269 , z -9.110771
#12 @ 5319 ms: x -1.441577 , y 4.622658 , z -9.120381
#13 @ 5428 ms: x -1.431967 , y 4.613048 , z -9.129991
#14 @ 5537 ms: x -1.451188 , y 4.622658 , z -9.129991
#15 @ 5647 ms: x -1.431967 , y 4.651490 , z -9.129991