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temporarily prevent a problem with the DMA, which occurs when using petalinux 2018.3, the ezdma and when switching from tx to rx transfer mode.

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This commit is contained in:
Marc Majoral 2021-10-08 10:14:38 +02:00
parent decade163d
commit eccf2ee746
1 changed files with 17 additions and 1 deletions
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18
src/algorithms/signal_source/adapters/ad9361_fpga_signal_source.cc
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@ -626,7 +626,23 @@ void Ad9361FpgaSignalSource::run_DMA_process(const std::string &filename0, const
int num_transferred_bytes; int num_transferred_bytes;
// Open DMA device // Open DMA device
const int tx_fd = open("/dev/loop_tx", O_WRONLY); int tx_fd = open("/dev/loop_tx", O_WRONLY);
if (tx_fd < 0)
{
std::cerr << "Cannot open loop device\n";
// stop the receiver
queue->push(pmt::make_any(command_event_make(200, 0)));
return;
}
// note: a problem was identified with the DMA: when switching from tx to rx or rx to tx mode
// the DMA transmission may hang. This problem will be fixed soon.
// for the moment this problem can be avoided by closing and opening the DMA a second time
if (close(tx_fd) < 0)
{
std::cerr << "Error closing loop device " << '\n';
}
// open the DMA a second time
tx_fd = open("/dev/loop_tx", O_WRONLY);
if (tx_fd < 0) if (tx_fd < 0)
{ {
std::cerr << "Cannot open loop device\n"; std::cerr << "Cannot open loop device\n";