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Update dma.py #1477

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11 changes: 8 additions & 3 deletions pynq/lib/dma.py
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Original file line number Diff line number Diff line change
Expand Up @@ -310,7 +310,7 @@ def stop(self):
def _clear_interrupt(self):
self._mmio.write(self._offset + 4, 0x1000)

def transfer(self, array, start=0, nbytes=0, cyclic=False):
def transfer(self, array, start=0, nbytes=0, cyclic=False, bd_allocate_target=None):
"""Transfer memory with the DMA

Transfer must only be called when the channel is halted
Expand Down Expand Up @@ -345,7 +345,9 @@ def transfer(self, array, start=0, nbytes=0, cyclic=False):
Number of bytes to transfer. Default is 0.
cyclic : bool
Enable cyclic BD mode. Default is False.

bd_allocate_target : PynqBuffer
The target memory to allocate buffer descriptors. Default is None.
If None, the buffer descriptors are allocated in the active memory.
"""

if not self.halted:
Expand Down Expand Up @@ -377,7 +379,10 @@ def transfer(self, array, start=0, nbytes=0, cyclic=False):

# Zero-Allocate buffer for descriptors: uint32[_num_descr][16]
# Descriptor is only 52 bytes but each one has to be 64-byte aligned!
self._descr = allocate(shape=(self._num_descr, 16), dtype=numpy.uint32)
self._descr = allocate(shape=(self._num_descr, 16), dtype=numpy.uint32, target=bd_allocate_target)

# Fill descriptors with zeros in case of re-use of allocated memory without board reset
self._descr.fill(0)

# Idle DMA engine
self.stop()
Expand Down