197 lines
6.5 KiB
Python
197 lines
6.5 KiB
Python
from __future__ import print_function
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from time import time, sleep
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import RPi.GPIO as GPIO
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import subprocess
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import numpy as np
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import matplotlib.pyplot as plt
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from time import sleep, time
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from os import system
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from sys import stdout
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from IPython import embed
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from uldaq import (get_daq_device_inventory, DaqDevice, AInScanFlag, ScanStatus,
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ScanOption, create_float_buffer, InterfaceType, AiInputMode)
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def GPIO_setup():
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# LED output pins
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GPIO.setmode(GPIO.BOARD)
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GPIO.setup(11, GPIO.OUT) # 1
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GPIO.output(11, GPIO.LOW)
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GPIO.setup(13, GPIO.OUT) # 2
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GPIO.output(13, GPIO.LOW)
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LED_status = [False, False]
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# switch controlled input
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GPIO.setup(16, GPIO.IN)
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GPIO.setup(18, GPIO.IN)
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return LED_status
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def main():
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LED_status = GPIO_setup()
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# DAQ setup
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if True:
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channels = 16
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status = ScanStatus.IDLE
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descriptor_index = 0 # ToDo: ????
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range_index = 0 # ToDo: ????
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interface_type = InterfaceType.USB
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low_channel = 0
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high_channel = channels
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samples_per_channel = 20000 # ToDo: ???? Buffer size ?!
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rate = 20000
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scan_options = ScanOption.CONTINUOUS
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flags = AInScanFlag.DEFAULT
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# Get descriptors for all of the available DAQ devices.
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devices = get_daq_device_inventory(interface_type)
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number_of_devices = len(devices)
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if number_of_devices == 0:
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raise Exception('Error: No DAQ devices found')
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print('Found', number_of_devices, 'DAQ device(s):')
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for i in range(number_of_devices):
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print(' ', devices[i].product_name, ' (', devices[i].unique_id, ')', sep='')
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# Create the DAQ device object associated with the specified descriptor index.
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daq_device = None
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daq_device = DaqDevice(devices[descriptor_index])
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# Get the AiDevice object and verify that it is valid.
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ai_device = None
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ai_device = daq_device.get_ai_device()
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if ai_device is None:
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raise Exception('Error: The DAQ device does not support analog input')
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# Verify that the specified device supports hardware pacing for analog input.
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ai_info = ai_device.get_info()
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if not ai_info.has_pacer():
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raise Exception('\nError: The specified DAQ device does not support hardware paced analog input')
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# Establish a connection to the DAQ device.
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descriptor = daq_device.get_descriptor()
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print('\nConnecting to', descriptor.dev_string, '- please wait...')
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daq_device.connect()
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# The default input mode is SINGLE_ENDED.
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input_mode = AiInputMode.SINGLE_ENDED
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# If SINGLE_ENDED input mode is not supported, set to DIFFERENTIAL.
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if ai_info.get_num_chans_by_mode(AiInputMode.SINGLE_ENDED) <= 0:
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input_mode = AiInputMode.DIFFERENTIAL
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# Get the number of channels and validate the high channel number.
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number_of_channels = ai_info.get_num_chans_by_mode(input_mode)
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if high_channel >= number_of_channels:
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high_channel = number_of_channels - 1
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channel_count = high_channel - low_channel + 1
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# Get a list of supported ranges and validate the range index.
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ranges = ai_info.get_ranges(input_mode)
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if range_index >= len(ranges):
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range_index = len(ranges) - 1
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# Allocate a buffer to receive the data.
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data = create_float_buffer(channel_count, samples_per_channel)
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system('clear')
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# Start the acquisition.
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rate = ai_device.a_in_scan(low_channel, high_channel, input_mode, ranges[range_index], samples_per_channel,
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rate, scan_options, flags, data)
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last_idx = 0
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f = open('/media/pi/data1/test_file.raw', 'wb')
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# LED on when here ... wait for switch to start data aquisition
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GPIO.output(11, GPIO.HIGH)
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LED_status[0] = True
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while GPIO.input(16) == GPIO.LOW:
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sleep(.1)
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GPIO.output(11, GPIO.LOW)
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LED_status[0] = False
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LED_t = time()
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LED_t_interval = 2
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disp_eth_power = True
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try:
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while GPIO.input(16) == GPIO.HIGH:
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# blinking LED
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if time() - LED_t < .1 and LED_status[0] == False:
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LED_status[0] = True
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GPIO.output(11, GPIO.HIGH)
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if time() - LED_t >= .1 and LED_status[0] == True:
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LED_status[0] = False
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GPIO.output(11, GPIO.LOW)
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if time() - LED_t >= LED_t_interval:
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LED_t = time()
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# dist & eth0 controll
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if GPIO.input(18) == GPIO.HIGH:
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if disp_eth_power == True:
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subprocess.run(['tvservice', '-o'])
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subprocess.run(['vcgencmd', 'display_power', '0'])
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subprocess.run(['sudo', 'ip', 'link', 'set', 'eth0', 'down'])
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disp_eth_power = False
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else:
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if disp_eth_power == False:
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subprocess.run(['tvservice', '-p'])
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subprocess.run(['vcgencmd', 'display_power', '1'])
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subprocess.run(['sudo', '/bin/chvt', '6'])
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subprocess.run(['sudo', '/bin/chvt', '7'])
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subprocess.run(['sudo', 'ip', 'link', 'set', 'eth0', 'up'])
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disp_eth_power = True
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# Get the status of the background operation
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status, transfer_status = ai_device.get_scan_status()
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index = transfer_status.current_index
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if (last_idx > index) and (index != -1):
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np.array(data[last_idx:], dtype=np.float32).tofile(f)
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np.array(data[:index], dtype=np.float32).tofile(f)
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if index == -1:
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pass
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else:
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np.array(data[last_idx:index], dtype=np.float32).tofile(f)
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if index == -1:
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last_idx= len(data)
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else:
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last_idx = index
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except KeyboardInterrupt:
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pass
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f.close()
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if daq_device:
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# Stop the acquisition if it is still running.
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if status == ScanStatus.RUNNING:
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ai_device.scan_stop()
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if daq_device.is_connected():
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daq_device.disconnect()
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daq_device.release()
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if disp_eth_power == False:
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subprocess.run(['tvservice', '-p'])
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subprocess.run(['vcgencmd', 'display_power', '1'])
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subprocess.run(['sudo', '/bin/chvt', '6'])
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subprocess.run(['sudo', '/bin/chvt', '7'])
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# subprocess.run(['sudo', 'ip', 'link', 'set', 'eth0', 'up'])
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GPIO.cleanup()
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if __name__ == '__main__':
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main()
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