1 // Copyright 2016 Emilie Gillet. 2 // 3 // Author: Emilie Gillet (emilie.o.gillet@gmail.com) 4 // 5 // Permission is hereby granted, free of charge, to any person obtaining a copy 6 // of this software and associated documentation files (the "Software"), to deal 7 // in the Software without restriction, including without limitation the rights 8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 // copies of the Software, and to permit persons to whom the Software is 10 // furnished to do so, subject to the following conditions: 11 // 12 // The above copyright notice and this permission notice shall be included in 13 // all copies or substantial portions of the Software. 14 // 15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 21 // THE SOFTWARE. 22 // 23 // See http://creativecommons.org/licenses/MIT/ for more information. 24 // 25 // ----------------------------------------------------------------------------- 26 // 27 // Drivers for the PCM5100 DAC. 28 29 #ifndef PLAITS_DRIVERS_DAC_H_ 30 #define PLAITS_DRIVERS_DAC_H_ 31 32 #include "stmlib/stmlib.h" 33 34 namespace plaits { 35 36 const size_t kMaxCodecBlockSize = 24; 37 38 class AudioDac { 39 public: AudioDac()40 AudioDac() { } ~AudioDac()41 ~AudioDac() { } 42 43 typedef struct { 44 short l; 45 short r; 46 } Frame; 47 48 typedef void (*FillBufferCallback)(Frame* tx, size_t size); 49 50 void Init(int sample_rate, size_t block_size); 51 void Start(FillBufferCallback callback); 52 void Stop(); 53 void Fill(size_t offset); 54 GetInstance()55 static AudioDac* GetInstance() { return instance_; } 56 57 private: 58 void InitializeGPIO(); 59 void InitializeAudioInterface(int sample_rate); 60 void InitializeDMA(size_t block_size); 61 static AudioDac* instance_; 62 63 size_t block_size_; 64 FillBufferCallback callback_; 65 66 Frame tx_dma_buffer_[kMaxCodecBlockSize * 2]; 67 68 DISALLOW_COPY_AND_ASSIGN(AudioDac); 69 }; 70 71 } // namespace plaits 72 73 #endif // PLAITS_DRIVERS_DAC_H_ 74