I can use the following to get output on pin x6. However, this seems to run forever.
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dac.write_timed(buffer, 20, mode=DAC.CIRCULAR)
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dac.write_timed(buffer, 20, mode=DAC.NORMAL)
I have posted a minimal, self-contained example below if someone wants to test it. This is a minimally working example:
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import math
import pyb
from pyb import DAC,delay
wave = [255,0] * 10
buffer = bytearray(wave)
# This does produce a block wave on pin x6
print('Start 1')
dac = DAC(2)
dac.write_timed(buffer, 20, mode=DAC.CIRCULAR)
delay(5000)
# This does not give me any output on pin x6
print('Start 2')
dac = DAC(2)
dac.write_timed(buffer, 20, mode=DAC.NORMAL)
delay(2000)