Mc3632 Read acceleration#

You can read acceleration events from MC3632 sensor directly.

The data could be used for debugging manually in realtime mode as described in Xylo-Imu RealTime Mode With Acceleration Input.

Here is an example that displays reading acceleration from MC3632, which bases on packages :

- samna                 0.33.1
import samna
import time

def initialize_board():
    dk = samna.device.open_device("XyloImuTestBoard:0")
    dk.get_stop_watch().set_enable_value(True)  # Enable timestamp of output acceleration event.
    time.sleep(0.1)
    return dk

dk = initialize_board()
mc = dk.get_mc3632()
sink = samna.graph.sink_from(mc.get_source_node())  # Initialize sink node first before setting up mc3632, or you will miss some accelerations in the beginning.

def start_up_mc3236(mc):
    mc.setup()
    mc.set_auto_read_freq(20)    # Read 20 times every second.
    mc.auto_read_enable(True)    # Enable automatic reading.
    return mc

start_up_mc3236(mc)

def print_acceleration(accel: samna.events.Acceleration):
    # Calculate acceleration in the unit of g (earch gravity).
    # When the board places normally on a platform, the printed x,y,z should be near 0,0,1. In which 1 represents the earch gravity.
    x = accel.x * 4 / (1 << 14)
    y = accel.y * 4 / (1 << 14)
    z = accel.z * 4 / (1 << 14)
    print(f"acceleration {accel.sequence_id}: {x}, {y}, {z}, {accel.timestamp}")

recv_count = 100
acceleration_events = sink.get_n_events(recv_count, 10000)     # Try to receive 100 events in 10 seconds.
assert(len(acceleration_events) == recv_count)

[print_acceleration(accel) for accel in acceleration_events]
print(f"Timestamp average interval: {(acceleration_events[-1].timestamp - acceleration_events[0].timestamp) / (recv_count - 1)} microseconds.")