DmaIntf.cc

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// SPDX-FileCopyrightText: Deutsches Elektronen-Synchrotron DESY, MSK, ChimeraTK Project <chimeratk-support@desy.de>
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#include "DmaIntf.h"
 
#include "DeviceFile.h"
#include "Exception.h"
 
#include <fcntl.h>
 
namespace ChimeraTK {
 
  DmaIntf::DmaIntf(const std::string& devicePath, size_t channelIdx)
  : _c2h(devicePath + "/c2h" + std::to_string(channelIdx), O_RDONLY),
    _h2c(devicePath + "/h2c" + std::to_string(channelIdx), O_WRONLY) {}
 
  DmaIntf::~DmaIntf() {}
 
  void DmaIntf::read(uintptr_t address, int32_t* __restrict__ buf, size_t nbytes) {
    ssize_t result = ::pread(_c2h, buf, nbytes, address);
    if(result != static_cast<ssize_t>(nbytes)) {
      throw(ChimeraTK::runtime_error(
          "DmaIntf read size mismatch: read " + std::to_string(result) + " bytes, expected " + std::to_string(nbytes)));
    }
  }
 
  void DmaIntf::write(uintptr_t address, const int32_t* data, size_t nbytes) {
    ssize_t result = ::pwrite(_h2c, data, nbytes, address);
    if(result != static_cast<ssize_t>(nbytes)) {
      throw(ChimeraTK::runtime_error("DmaIntf write size mismatch: wrote " + std::to_string(result) +
          " bytes, expected " + std::to_string(nbytes)));
    }
  }
 
} // namespace ChimeraTK