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-rw-r--r--docs/library/pyb.DAC.rst12
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/library/pyb.DAC.rst b/docs/library/pyb.DAC.rst
index bf07119ad..0eb469bef 100644
--- a/docs/library/pyb.DAC.rst
+++ b/docs/library/pyb.DAC.rst
@@ -122,3 +122,15 @@ Methods
dac2 = DAC(2)
dac1.write_timed(buf1, pyb.Timer(6, freq=100), mode=DAC.CIRCULAR)
dac2.write_timed(buf2, pyb.Timer(7, freq=200), mode=DAC.CIRCULAR)
+
+Constants
+---------
+
+.. data:: DAC.NORMAL
+
+ NORMAL mode does a single transmission of the waveform in the data buffer,
+
+.. data:: DAC.CIRCULAR
+
+ CIRCULAR mode does a transmission of the waveform in the data buffer, and wraps around
+ to the start of the data buffer every time it reaches the end of the table.