dac.cxx

// dawn/src/io/dac.cxx
//
// SPDX-License-Identifier: Apache-2.0
//
 
#include "dawn/io/dac.hxx"
 
using namespace dawn;
 
int CIODac::configureDesc(const CDescObject &desc)
{
  const SObjectCfg::SObjectCfgItem *item = nullptr;
  size_t offset = 0;
 
  for (size_t i = 0; i < desc.getSize(); i++)
    {
      item = desc.objectCfgItemAtOffset(offset);
 
      if (item->cfgid.s.cls != CIOCommon::IO_CLASS_ANY)
        {
          DAWNERR("Unsupported DAC config 0x%08" PRIx32 "\n", item->cfgid.v);
          return -EINVAL;
        }
 
      offset += cfgCmnOffset(item);
    }
 
  return OK;
}
 
CIODac::~CIODac()
{
  deinit();
}
 
int CIODac::configure()
{
  int ret;
 
  if (getDtype() != SObjectId::DTYPE_INT32)
    {
      DAWNERR("DAC requires DTYPE_INT32\n");
      return -EINVAL;
    }
 
  // Configure object
 
  ret = configureDesc(getDesc());
  if (ret != OK)
    {
      DAWNERR("DAC configure failed (error %d)\n", ret);
      return ret;
    }
 
  // Get path to DAC
 
  if (getCmnDevno() == -1)
    {
      DAWNERR("DAC device number not configured\n");
      return -EINVAL;
    }
 
  snprintf(path, sizeof(path), DAC_PATH_FMT, getCmnDevno());
 
  // Open file
 
  fd = dac_open(path);
  if (fd < 0)
    {
      DAWNERR("failed to open file %d\n", -errno);
      return -errno;
    }
 
  // Intialize gpi
 
  dac_init(fd);
 
  return OK;
}
 
int CIODac::deinit()
{
  dac_close(fd);
  return OK;
}
 
int CIODac::setDataImpl(IODataCmn &data)
{
  int32_t *tmp = static_cast<int32_t *>(data.getDataPtr());
  dawn::porting::dac_write_s info;
  int ret;
 
  // Data dimmention must match DAC supported channels
 
  if (data.getItems() > 1)
    {
      return -ENOMEM;
    }
 
  // get data to write
 
  info.data = *tmp;
 
  // Write output
 
  ret = dac_write(fd, &info);
  if (ret < 0)
    {
      DAWNERR("dac_write failed %d\n", ret);
      return ret;
    }
 
#ifdef CONFIG_DAWN_IO_TIMESTAMP
  if (isTimestamp())
    {
      ts = getTimestamp();
    }
#endif
 
  return OK;
}
 
size_t CIODac::getDataSize() const
{
  return sizeof(uint32_t) * channels;
}
 
size_t CIODac::getDataDim() const
{
  return channels;
}