Hi everyone,
This is my first time using PYNQ. I’m getting this raise RuntimeError(“DMA channel not started”) error pointing to the line dma_recv.transfer(output_buffer) when calling my python script onto the bitstream.
I’m guessing this is an issue with either the HLS or the vivado IP? I’m following a tutorial so I’m not sure what causes this issue.
The python script:
from pynq import Overlay, allocate
import numpy as np
overlay = Overlay("/home/xilinx/IP/IP.bit")
# DMA objects
dma = overlay.axi_dma_0
dma_send = dma.sendchannel
dma_recv = dma.recvchannel
# Allocate input and output buffers
datasize = 784
input_buffer = allocate(shape=(datasize,), dtype=np.uint32)
output_buffer = allocate(shape=(1,), dtype=np.uint32)
# Send data from input_buffer using DMA send
dma_send.transfer(input_buffer)
# Receive data into output_buffer using DMA receive (memory-to-memory transfer)
dma_recv.transfer(output_buffer)
# Wait for the DMA operations to complete
dma_send.wait()
dma_recv.wait()
# Check buffers and print result
print("Input Buffer (Sent Data):", input_buffer)
print("Output Buffer (Received Data):", output_buffer)
