forked from M-Labs/nix-servo
60 lines
2.0 KiB
Python
60 lines
2.0 KiB
Python
import time
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from pyfastservo import adc, dac
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from pyfastservo.common import (
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ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR,
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ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR,
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CH0_HIGH_WORD_ADDR, CH0_LOW_WORD_ADDR,
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CH1_HIGH_WORD_ADDR, CH1_LOW_WORD_ADDR,
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read_from_memory, write_to_memory
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)
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def read_adc(channel):
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if channel == 0:
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return adc.read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR)
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elif channel == 1:
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return adc.read_adc_channel(ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR)
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else:
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raise ValueError("Invalid ADC channel")
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def write_dac(value):
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dac.set_dac_output(value)
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def read_dac(channel):
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if channel == 0:
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high_word = read_from_memory(CH0_HIGH_WORD_ADDR, 1)[0]
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low_word = read_from_memory(CH0_LOW_WORD_ADDR, 1)[0]
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elif channel == 1:
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high_word = read_from_memory(CH1_HIGH_WORD_ADDR, 1)[0]
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low_word = read_from_memory(CH1_LOW_WORD_ADDR, 1)[0]
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else:
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raise ValueError("Invalid DAC channel")
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return (high_word << 8) | low_word
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def perform_loopback_test(test_value):
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print(f"\nSetting DAC output to {test_value}...")
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write_dac(test_value)
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time.sleep(0.1) # Allow time for the signal to stabilize
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for channel in [0, 1]:
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print(f"\nTesting Channel {channel}")
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print(f"Reading ADC CH{channel} value...")
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adc_value = read_adc(channel)
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print(f"ADC CH{channel} readback: {adc_value}")
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print(f"Reading DAC CH{channel} value...")
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dac_value = read_dac(channel)
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print(f"DAC CH{channel} readback: {dac_value}")
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if abs(test_value - adc_value) <= 2 and abs(test_value - dac_value) <= 2:
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print(f"Loopback test for Channel {channel} PASSED!")
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else:
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print(f"Loopback test for Channel {channel} FAILED!")
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print(f"Expected: {test_value}, ADC: {adc_value}, DAC: {dac_value}")
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def main():
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test_value = 0x0FFF # Mid-range value (4095 in decimal)
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perform_loopback_test(test_value)
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if __name__ == "__main__":
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main() |