pdm_handle.h

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#ifndef HAL_PDM_HANDLE_H
#define HAL_PDM_HANDLE_H
 
#include <array>
#include <stdint.h>
#include <cstddef>
 
namespace lampda {
namespace hal {
namespace microphone {
 
static constexpr int16_t gainUpdateBaseline = 80;
 
struct PdmData
{
  static constexpr uint16_t SAMPLE_SIZE = 512;
  std::array<int16_t, SAMPLE_SIZE> data;
  uint64_t sampleDuration_us;
  uint64_t sampleTime_us;
 
  uint16_t sampleRead = 0;
  bool is_valid() const { return sampleRead > 0; }
};
 
namespace _private {
 
PdmData get();
 
// start the microphone readings
bool start();
// close the microphone readings
void stop();
 
} // namespace _private
 
} // namespace microphone
} // namespace hal
} // namespace lampda
 
#endif