dma_c2h.sh

. ./dma_param.sh

#--------------------- Start MM2S channel (C2H) ---------------------#
echo "Setting current descriptor address (CURDESC) ..."

reg_write $MM2S_CURDESC $((DMA_DESC2 + XDMA_BIAS))

echo "Starting channel (DMACR.RS=1) ..."

mm2s_dmacr_dec=$(reg_read $MM2S_DMACR)

reg_write $MM2S_DMACR $((mm2s_dmacr_dec | RS_MASK))

echo "Setting tail descriptor address (TAILDESC) and trigger the transfer..."

reg_write $MM2S_TAILDESC $((DMA_DESC3 + XDMA_BIAS))

echo "Polling MM2S (C2H) status..."

while true; do
    mm2s_dmasr_dec=$(reg_read $MM2S_DMASR)
    check_dma_error $mm2s_dmasr_dec
    if [ $((mm2s_dmasr_dec & HALTED_MASK)) -ne 0 ]; then
        echo "\033[31m[Error] MM2S channel has been halted.\033[0m"
        exit 1
    fi
    if [ $((mm2s_dmasr_dec & IDLE_MASK)) -ne 0 ]; then
        break
    fi
    sleep 0.01
done

echo "MM2S (C2H) transfer completed."