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97 lines
3.6 KiB
97 lines
3.6 KiB
/**************************************************************************//**
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* @file
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* @author Steve Lascos
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* @company Blackaddr Audio
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*
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* BAAudioEffectDelayExternal is a class for using an external SPI SRAM chip
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* as an audio delay line. The external memory can be shared among several
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* different instances of BAAudioEffectDelayExternal by specifying the max delay
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* length during construction.
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*
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* @copyright This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.*
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*****************************************************************************/
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#ifndef __BAEFFECTS_BAAUDIOEFFECTDELAYEXTERNAL_H
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#define __BAEFFECTS_BAAUDIOEFFECTDELAYEXTERNAL_H
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#include <Audio.h>
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#include "AudioStream.h"
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#include "BAHardware.h"
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namespace BAEffects {
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/**************************************************************************//**
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* BAAudioEffectDelayExternal can use external SPI RAM for delay rather than
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* the limited RAM available on the Teensy itself.
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*****************************************************************************/
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class BAAudioEffectDelayExternal : public AudioStream
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{
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public:
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/// Default constructor will use all memory available in MEM0
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BAAudioEffectDelayExternal();
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/// Specifiy which external memory to use
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/// @param type specify which memory to use
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BAAudioEffectDelayExternal(BALibrary::MemSelect type);
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/// Specify external memory, and how much of the memory to use
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/// @param type specify which memory to use
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/// @param delayLengthMs maximum delay length in milliseconds
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BAAudioEffectDelayExternal(BALibrary::MemSelect type, float delayLengthMs);
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virtual ~BAAudioEffectDelayExternal();
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/// set the actual amount of delay on a given delay tap
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/// @param channel specify channel tap 1-8
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/// @param milliseconds specify how much delay for the specified tap
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void delay(uint8_t channel, float milliseconds);
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/// Disable a delay channel tap
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/// @param channel specify channel tap 1-8
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void disable(uint8_t channel);
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virtual void update(void);
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static unsigned m_usingSPICount[2]; // internal use for all instances
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private:
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void initialize(BALibrary::MemSelect mem, unsigned delayLength = 1e6);
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void read(uint32_t address, uint32_t count, int16_t *data);
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void write(uint32_t address, uint32_t count, const int16_t *data);
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void zero(uint32_t address, uint32_t count);
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unsigned m_memoryStart; // the first address in the memory we're using
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unsigned m_memoryLength; // the amount of memory we're using
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unsigned m_headOffset; // head index (incoming) data into external memory
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unsigned m_channelDelayLength[8]; // # of sample delay for each channel (128 = no delay)
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unsigned m_activeMask; // which output channels are active
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static unsigned m_allocated[2];
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audio_block_t *m_inputQueueArray[1];
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BALibrary::MemSelect m_mem;
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SPIClass *m_spi = nullptr;
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int m_spiChannel = 0;
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int m_misoPin = 0;
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int m_mosiPin = 0;
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int m_sckPin = 0;
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int m_csPin = 0;
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void m_startUsingSPI(int spiBus);
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void m_stopUsingSPI(int spiBus);
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};
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} /* namespace BAEffects */
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#endif /* __BAEFFECTS_BAAUDIOEFFECTDELAYEXTERNAL_H */
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