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Merged
jogomojo merged 1 commit into from
Nov 7, 2025
Merged

Update dma.py #1521

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6 changes: 3 additions & 3 deletions pynq/lib/dma.py
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Original file line number Diff line number Diff line change
Expand Up @@ -127,7 +127,7 @@ def transfer(self, array, start=0, nbytes=0):
array : ContiguousArray
An contiguously allocated array to be transferred
start : int
Offset into array to start. Default is 0.
Byte offset into array to start. Default is 0.
nbytes : int
Number of bytes to transfer. Default is 0.

Expand Down Expand Up @@ -344,7 +344,7 @@ def transfer(self, array, start=0, nbytes=0, cyclic=False):
array : ContiguousArray
An contiguously allocated array to be transferred
start : int
Offset into array to start. Default is 0.
Byte offset into array to start. Default is 0.
nbytes : int
Number of bytes to transfer. Default is 0.
cyclic : bool
Expand Down Expand Up @@ -414,7 +414,7 @@ def transfer(self, array, start=0, nbytes=0, cyclic=False):
remain -= d_len

# Buffer address (64-bit)
self._descr[i, 2] = (array.physical_address + (i * blk_size)) & 0xFFFFFFFF
self._descr[i, 2] = (array.physical_address + start + (i * blk_size)) & 0xFFFFFFFF
self._descr[i, 3] = (
(array.physical_address + start + (i * blk_size)) >> 32
) & 0xFFFFFFFF
Expand Down