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/* Audio Library for Teensy 3.X
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* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com |
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* |
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* Development of this audio library was funded by PJRC.COM, LLC by sales of |
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop |
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* open source software by purchasing Teensy or other PJRC products. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice, development funding notice, and this permission |
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* notice shall be included in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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#include <Arduino.h> |
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#include "extmem8.h" |
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//#define INTERNAL_TEST
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// While 20 MHz (Teensy actually uses 16 MHz in most cases) and even 24 MHz
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// have worked well in testing at room temperature with 3.3V power, to fully
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// meet all the worst case timing specs, the SPI clock low time would need
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// to be 40ns (12.5 MHz clock) for the single chip case and 51ns (9.8 MHz
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// clock) for the 6-chip memoryboard with 74LCX126 buffers.
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//
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// Timing analysis and info is here:
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// https://forum.pjrc.com/threads/29276-Limits-of-delay-effect-in-audio-library?p=97506&viewfull=1#post97506
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#define SPISETTING SPISettings(20'000'000, MSBFIRST, SPI_MODE0) |
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// Use these with the audio adaptor board (should be adjustable by the user...)
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#define SPIRAM_MOSI_PIN 7 |
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#define SPIRAM_MISO_PIN 12 |
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#define SPIRAM_SCK_PIN 14 |
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#define SPIRAM_CS_PIN 6 |
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#define MEMBOARD_CS0_PIN 2 |
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#define MEMBOARD_CS1_PIN 3 |
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#define MEMBOARD_CS2_PIN 4 |
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#define SIZEOF_SAMPLE (sizeof(((audio_block_t*) 0)->data[0])) |
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static const uint32_t NOT_ENOUGH_MEMORY = 0xFFFFFFFF; |
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// This memory size array needs to match the sizes of
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// the entries in AudioEffectDelayMemoryType8_t
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const uint32_t AudioExtMem8::memSizeSamples[AUDIO_MEMORY8_UNDEFINED] = {65536,393216,262144,4194304,8000}; |
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AudioExtMem8* AudioExtMem8::first[AUDIO_MEMORY8_UNDEFINED] = {nullptr}; |
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AudioExtMem8::~AudioExtMem8()
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{ |
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switch (memory_type) |
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{ |
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case AUDIO_MEMORY8_HEAP: |
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free((void*) memory_begin); |
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break; |
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#if defined(ARDUINO_TEENSY41) |
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case AUDIO_MEMORY8_EXTMEM: |
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extmem_free((void*) memory_begin); |
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break; |
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#endif // defined(ARDUINO_TEENSY41)
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// audio SPI memory is tracked by AudioExtMem8
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// objects thenselves - no need to free
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default: |
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break;
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} |
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linkOut(); |
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} |
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void AudioExtMem8::linkIn(void) |
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{ |
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if (memory_type < AUDIO_MEMORY8_UNDEFINED) |
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{ |
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AudioExtMem8** ppEM = &first[memory_type];
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while (nullptr != *ppEM) |
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{ |
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if (memory_begin > (*ppEM)->memory_begin) |
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ppEM = &((*ppEM)->next); |
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else |
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break; |
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} |
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next = *ppEM; |
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*ppEM = this; |
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} |
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} |
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void AudioExtMem8::linkOut(void) |
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{ |
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if (memory_type < AUDIO_MEMORY8_UNDEFINED) // This Never Happens...
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{ |
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AudioExtMem8** ppEM = &first[memory_type];
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while (nullptr != *ppEM) |
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{ |
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if (this != *ppEM) |
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ppEM = &((*ppEM)->next); |
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else |
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{ |
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*ppEM = next; |
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break; |
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} |
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} |
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next = nullptr; // not really necessary, but...
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} |
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} |
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/**
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* Find space for given number of samples. This MUST be called before the |
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* newly-created AudioExtMem8 object is linked into the allocation list. |
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*/ |
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uint32_t AudioExtMem8::findSpace(AudioEffectDelayMemoryType8_t memory_type, uint32_t samples) |
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{ |
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uint32_t result = 0; |
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bool gotOne = false; |
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if (memory_type < AUDIO_MEMORY8_UNDEFINED) // This Never Happens...
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{ |
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AudioExtMem8** ppEM = &first[memory_type];
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do |
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{ |
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uint32_t next_start; |
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if (nullptr == *ppEM) // end of list, or first memory allocation
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next_start = memSizeSamples[memory_type]; |
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else // we've found an object using memory
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{ |
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AudioExtMem8* nextObj = (*ppEM)->next; |
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result = (*ppEM)->memory_begin + (*ppEM)->memory_length; // end of object's allocation
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if (nullptr != nextObj) |
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next_start = nextObj->memory_begin; |
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else |
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next_start = memSizeSamples[memory_type]; |
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ppEM = &((*ppEM)->next); |
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} |
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// simple-minded allocation: first found fit
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if (samples <= (next_start - result)) |
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gotOne = true; |
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} while (!gotOne && nullptr != *ppEM); |
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}
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if (!gotOne) |
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result = NOT_ENOUGH_MEMORY; |
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return result; |
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} |
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/**
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* Find maximum contiguous space in a memory. |
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*/ |
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uint32_t AudioExtMem8::findMaxSpace(AudioEffectDelayMemoryType8_t memory_type) |
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{ |
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uint32_t result = 0; |
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uint32_t samples = 0; |
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if (memory_type < AUDIO_MEMORY8_UNDEFINED) // This Never Happens...
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{ |
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AudioExtMem8** ppEM = &first[memory_type];
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do |
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{ |
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uint32_t next_start; |
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if (nullptr == *ppEM) // end of list, or first memory allocation
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next_start = memSizeSamples[memory_type]; |
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else // we've found an object using memory
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{ |
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AudioExtMem8* nextObj = (*ppEM)->next; |
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result = (*ppEM)->memory_begin + (*ppEM)->memory_length; // end of object's allocation
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if (nullptr != nextObj) |
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next_start = nextObj->memory_begin; |
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else |
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next_start = memSizeSamples[memory_type]; |
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ppEM = &((*ppEM)->next); |
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} |
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// if space is bigger, bump the answer
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if (samples <= (next_start - result)) |
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samples = (next_start - result); |
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} while (nullptr != *ppEM); |
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}
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return samples; |
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} |
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void AudioExtMem8::initialize(AudioEffectDelayMemoryType8_t type, uint32_t samples) |
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{ |
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//uint32_t memsize, avail;
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uint32_t avail; |
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void* mem; |
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#if defined(INTERNAL_TEST) |
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type = AUDIO_MEMORY8_INTERNAL; |
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#endif // defined(INTERNAL_TEST)
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head_offset = 0; |
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memory_type = type; |
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SPI.setMOSI(SPIRAM_MOSI_PIN); |
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SPI.setMISO(SPIRAM_MISO_PIN); |
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SPI.setSCK(SPIRAM_SCK_PIN); |
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SPI.begin(); |
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//memsize = memSizeSamples[type];
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//Serial.printf("Requested %d samples\n",samples);
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switch (type) |
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{ |
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case AUDIO_MEMORY8_PSRAM64: |
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case AUDIO_MEMORY8_23LC1024: |
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case AUDIO_MEMORY8_CY15B104: |
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pinMode(SPIRAM_CS_PIN, OUTPUT); |
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digitalWriteFast(SPIRAM_CS_PIN, HIGH); |
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break; |
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case AUDIO_MEMORY8_MEMORYBOARD: |
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pinMode(MEMBOARD_CS0_PIN, OUTPUT); |
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pinMode(MEMBOARD_CS1_PIN, OUTPUT); |
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pinMode(MEMBOARD_CS2_PIN, OUTPUT); |
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digitalWriteFast(MEMBOARD_CS0_PIN, LOW); |
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digitalWriteFast(MEMBOARD_CS1_PIN, LOW); |
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digitalWriteFast(MEMBOARD_CS2_PIN, LOW);
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pinMode(SPIRAM_CS_PIN, OUTPUT); |
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digitalWriteFast(SPIRAM_CS_PIN, HIGH); |
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break; |
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case AUDIO_MEMORY8_INTERNAL: |
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case AUDIO_MEMORY8_HEAP: |
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case AUDIO_MEMORY8_EXTMEM: |
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break; |
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default: |
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samples = 0; |
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break; |
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} |
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#define noOLD_ALLOCATE |
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#if defined(OLD_ALLOCATE) |
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avail = memsize - allocated[type]; |
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if (avail < AUDIO_BLOCK_SAMPLES*2+1) { |
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memory_type = AUDIO_MEMORY8_UNDEFINED; |
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//return;
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} |
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if (samples > avail) samples = avail; |
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memory_begin = allocated[type]; |
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allocated[type] += samples; |
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#else |
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switch (type) |
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{ |
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// SPI memory
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// Emulate old behaviour: allocate biggest possible chunk
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// of delay memory if asked for more than is available.
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// Slightly different in dynamic system because of fragmentation,
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// but should be the same if used with legacy static design.
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case AUDIO_MEMORY8_PSRAM64: |
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case AUDIO_MEMORY8_23LC1024: |
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case AUDIO_MEMORY8_CY15B104: |
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case AUDIO_MEMORY8_MEMORYBOARD: |
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avail = findMaxSpace(type); |
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if (samples > avail) |
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samples = avail; |
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//Serial.printf("findSpace says we could use %08lX\n",findSpace(type,samples));
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memory_begin = findSpace(type,samples); |
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break; |
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// processor heap: could be useful on Teensy 4.x etc.
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// In this case don't fill heap if asked for too much
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case AUDIO_MEMORY8_HEAP: |
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mem = malloc(samples * SIZEOF_SAMPLE); |
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if (nullptr != mem) |
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memory_begin = (uint32_t) mem; |
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else |
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memory_begin = NOT_ENOUGH_MEMORY; |
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break; |
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#if defined(ARDUINO_TEENSY41) |
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// PSRAM external memory
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case AUDIO_MEMORY8_EXTMEM: |
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mem = extmem_malloc(samples * SIZEOF_SAMPLE); |
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if (nullptr != mem) |
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memory_begin = (uint32_t) mem; |
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else |
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memory_begin = NOT_ENOUGH_MEMORY; |
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break; |
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#endif // defined(ARDUINO_TEENSY41)
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default: // invalid memory type
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memory_begin = NOT_ENOUGH_MEMORY; |
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break; |
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} |
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if (NOT_ENOUGH_MEMORY == memory_begin) |
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memory_type = AUDIO_MEMORY8_UNDEFINED; |
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#endif // defined(OLD_ALLOCATE)
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if (AUDIO_MEMORY8_UNDEFINED != memory_type) |
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{ |
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memory_length = samples; |
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zero(0, memory_length); |
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linkIn(); |
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} |
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else |
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memory_length = 0; |
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} |
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#ifdef INTERNAL_TEST |
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static int16_t testmem[8000]; // testing only
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#endif |
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void AudioExtMem8::SPIreadMany(int16_t* data, uint32_t samples) |
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{ |
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if (nullptr != data) |
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{ |
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while (samples--)
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*data++ = (int16_t)(SPI.transfer16(0)); |
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} |
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else |
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{ |
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while (samples--)
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(int16_t)(SPI.transfer16(0)); |
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} |
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} |
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void AudioExtMem8::SPIwriteMany(const int16_t* data, uint32_t samples) |
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{ |
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if (nullptr != data) |
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{ |
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while (samples--)
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SPI.transfer16(*data++); |
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} |
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else |
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{ |
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while (samples--)
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SPI.transfer16(0); |
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}
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} |
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void AudioExtMem8::read(uint32_t offset, uint32_t count, int16_t *data) |
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{ |
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uint32_t addr = memory_begin + offset; |
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#ifdef INTERNAL_TEST |
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if (nullptr != data) while (count) { *data++ = testmem[addr++]; count--; } // testing only
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#else |
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switch (memory_type) |
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{ |
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case AUDIO_MEMORY8_23LC1024: |
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case AUDIO_MEMORY8_PSRAM64:
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case AUDIO_MEMORY8_CY15B104: |
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addr *= SIZEOF_SAMPLE; |
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SPI.beginTransaction(SPISETTING); |
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digitalWriteFast(SPIRAM_CS_PIN, LOW); |
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SPI.transfer16((0x03 << 8) | (addr >> 16)); |
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SPI.transfer16(addr & 0xFFFF); |
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SPIreadMany(data,count); |
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digitalWriteFast(SPIRAM_CS_PIN, HIGH); |
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SPI.endTransaction(); |
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break; |
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case AUDIO_MEMORY8_MEMORYBOARD: |
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SPI.beginTransaction(SPISETTING); |
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while (count) { |
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uint32_t chip = (addr >> 16) + 1; |
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digitalWriteFast(MEMBOARD_CS0_PIN, chip & 1); |
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digitalWriteFast(MEMBOARD_CS1_PIN, chip & 2); |
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digitalWriteFast(MEMBOARD_CS2_PIN, chip & 4); |
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uint32_t chipaddr = (addr & 0xFFFF) * SIZEOF_SAMPLE; |
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SPI.transfer16((0x03 << 8) | (chipaddr >> 16)); |
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SPI.transfer16(chipaddr & 0xFFFF); |
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uint32_t num = 0x10000 - (addr & 0xFFFF); |
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if (num > count) num = count; |
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count -= num; |
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addr += num; |
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SPIreadMany(data,num); |
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} |
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digitalWriteFast(MEMBOARD_CS0_PIN, LOW); |
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digitalWriteFast(MEMBOARD_CS1_PIN, LOW); |
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digitalWriteFast(MEMBOARD_CS2_PIN, LOW); |
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SPI.endTransaction(); |
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break; |
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case AUDIO_MEMORY8_HEAP: |
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#if defined(ARDUINO_TEENSY41) |
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case AUDIO_MEMORY8_EXTMEM: |
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#endif // defined(ARDUINO_TEENSY41)
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addr = memory_begin + offset*SIZEOF_SAMPLE; |
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if (nullptr != data) |
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memcpy(data,(void*) addr,count*SIZEOF_SAMPLE); |
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break; |
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default: |
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break; |
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} |
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#endif |
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} |
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void AudioExtMem8::write(uint32_t offset, uint32_t count, const int16_t *data) |
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{ |
||||||
|
uint32_t addr = memory_begin + offset; |
||||||
|
|
||||||
|
#ifdef INTERNAL_TEST |
||||||
|
while (count) { testmem[addr++] = *data++; count--; } // testing only
|
||||||
|
#else |
||||||
|
switch (memory_type) |
||||||
|
{ |
||||||
|
case AUDIO_MEMORY8_23LC1024: |
||||||
|
case AUDIO_MEMORY8_PSRAM64: |
||||||
|
addr *= SIZEOF_SAMPLE; |
||||||
|
SPI.beginTransaction(SPISETTING); |
||||||
|
digitalWriteFast(SPIRAM_CS_PIN, LOW); |
||||||
|
SPI.transfer16((0x02 << 8) | (addr >> 16)); |
||||||
|
SPI.transfer16(addr & 0xFFFF); |
||||||
|
SPIwriteMany(data,count); |
||||||
|
digitalWriteFast(SPIRAM_CS_PIN, HIGH); |
||||||
|
SPI.endTransaction(); |
||||||
|
break; |
||||||
|
|
||||||
|
case AUDIO_MEMORY8_CY15B104: |
||||||
|
addr *= SIZEOF_SAMPLE; |
||||||
|
|
||||||
|
SPI.beginTransaction(SPISETTING); |
||||||
|
digitalWriteFast(SPIRAM_CS_PIN, LOW); |
||||||
|
SPI.transfer(0x06); //write-enable before every write
|
||||||
|
digitalWriteFast(SPIRAM_CS_PIN, HIGH); |
||||||
|
asm volatile ("NOP\n NOP\n NOP\n NOP\n NOP\n NOP\n"); |
||||||
|
digitalWriteFast(SPIRAM_CS_PIN, LOW); |
||||||
|
SPI.transfer16((0x02 << 8) | (addr >> 16)); |
||||||
|
SPI.transfer16(addr & 0xFFFF); |
||||||
|
SPIwriteMany(data,count); |
||||||
|
digitalWriteFast(SPIRAM_CS_PIN, HIGH); |
||||||
|
SPI.endTransaction();
|
||||||
|
break; |
||||||
|
|
||||||
|
case AUDIO_MEMORY8_MEMORYBOARD:
|
||||||
|
SPI.beginTransaction(SPISETTING); |
||||||
|
while (count) { |
||||||
|
uint32_t chip = (addr >> 16) + 1; |
||||||
|
digitalWriteFast(MEMBOARD_CS0_PIN, chip & 1); |
||||||
|
digitalWriteFast(MEMBOARD_CS1_PIN, chip & 2); |
||||||
|
digitalWriteFast(MEMBOARD_CS2_PIN, chip & 4); |
||||||
|
uint32_t chipaddr = (addr & 0xFFFF) * SIZEOF_SAMPLE; |
||||||
|
SPI.transfer16((0x02 << 8) | (chipaddr >> 16)); |
||||||
|
SPI.transfer16(chipaddr & 0xFFFF); |
||||||
|
uint32_t num = 0x10000 - (addr & 0xFFFF); |
||||||
|
if (num > count) num = count; |
||||||
|
count -= num; |
||||||
|
addr += num; |
||||||
|
SPIwriteMany(data,num); |
||||||
|
} |
||||||
|
digitalWriteFast(MEMBOARD_CS0_PIN, LOW); |
||||||
|
digitalWriteFast(MEMBOARD_CS1_PIN, LOW); |
||||||
|
digitalWriteFast(MEMBOARD_CS2_PIN, LOW); |
||||||
|
SPI.endTransaction(); |
||||||
|
break; |
||||||
|
|
||||||
|
case AUDIO_MEMORY8_HEAP: |
||||||
|
#if defined(ARDUINO_TEENSY41) |
||||||
|
case AUDIO_MEMORY8_EXTMEM: |
||||||
|
#endif // defined(ARDUINO_TEENSY41)
|
||||||
|
addr = memory_begin + offset*SIZEOF_SAMPLE; |
||||||
|
if (nullptr != data) |
||||||
|
memcpy((void*) addr,data,count*SIZEOF_SAMPLE); |
||||||
|
else |
||||||
|
memset((void*) addr,0,count*SIZEOF_SAMPLE); |
||||||
|
break;
|
||||||
|
|
||||||
|
default: |
||||||
|
break; |
||||||
|
} |
||||||
|
#endif |
||||||
|
} |
@ -0,0 +1,93 @@ |
|||||||
|
/* Audio Library for Teensy 3.X
|
||||||
|
* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com |
||||||
|
* |
||||||
|
* Development of this audio library was funded by PJRC.COM, LLC by sales of |
||||||
|
* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop |
||||||
|
* open source software by purchasing Teensy or other PJRC products. |
||||||
|
* |
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy |
||||||
|
* of this software and associated documentation files (the "Software"), to deal |
||||||
|
* in the Software without restriction, including without limitation the rights |
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
||||||
|
* copies of the Software, and to permit persons to whom the Software is |
||||||
|
* furnished to do so, subject to the following conditions: |
||||||
|
* |
||||||
|
* The above copyright notice, development funding notice, and this permission |
||||||
|
* notice shall be included in all copies or substantial portions of the Software. |
||||||
|
* |
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
||||||
|
* THE SOFTWARE. |
||||||
|
*/ |
||||||
|
|
||||||
|
#ifndef _extmem8_h_ |
||||||
|
#define _extmem8_h_ |
||||||
|
#include "Arduino.h" |
||||||
|
#include "spi_interrupt.h" |
||||||
|
|
||||||
|
// A quick experiment with a Teensy 4.1
|
||||||
|
// suggests a 1-input 3-tap delay line uses:
|
||||||
|
// mem type CPU%
|
||||||
|
// Heap <tiny%>
|
||||||
|
// EXTMEM 1.3%
|
||||||
|
// SPI PSRAM 12% (40MHz SPI clock)
|
||||||
|
// SPI PSRAM 19% (20MHz SPI clock)
|
||||||
|
|
||||||
|
enum AudioEffectDelayMemoryType8_t { |
||||||
|
AUDIO_MEMORY8_23LC1024 = 0, // 128k x 8 S-RAM (1.48s @ 44kHz / 16 bit)
|
||||||
|
AUDIO_MEMORY8_MEMORYBOARD = 1, // 6x 128k x 8 (8.9s @ 44kHz / 16 bit)
|
||||||
|
AUDIO_MEMORY8_CY15B104 = 2, // 512k x 8 F-RAM (5.9s @ 44kHz / 16 bit)
|
||||||
|
AUDIO_MEMORY8_PSRAM64 = 3, // 64Mb / 8MB PSRAM (95s @ 44kHz / 16 bit)
|
||||||
|
AUDIO_MEMORY8_INTERNAL = 4, // 8000 samples (181ms), for test only!
|
||||||
|
AUDIO_MEMORY8_HEAP = 5, |
||||||
|
AUDIO_MEMORY8_EXTMEM = 6, |
||||||
|
AUDIO_MEMORY8_UNDEFINED |
||||||
|
}; |
||||||
|
|
||||||
|
#define IS_SPI_TYPE (AUDIO_MEMORY8_23LC1024 == memory_type || \ |
||||||
|
AUDIO_MEMORY8_MEMORYBOARD == memory_type || \
|
||||||
|
AUDIO_MEMORY8_CY15B104 == memory_type || \
|
||||||
|
AUDIO_MEMORY8_PSRAM64 == memory_type) |
||||||
|
|
||||||
|
class AudioExtMem8 |
||||||
|
{ |
||||||
|
public: |
||||||
|
AudioExtMem8(AudioEffectDelayMemoryType8_t type, uint32_t samples = AUDIO_SAMPLE_RATE_EXACT) |
||||||
|
: memory_begin(0) |
||||||
|
{ |
||||||
|
initialize(type, samples); |
||||||
|
} |
||||||
|
AudioExtMem8() : AudioExtMem8(AUDIO_MEMORY8_23LC1024, 65536) {} |
||||||
|
~AudioExtMem8(); |
||||||
|
float getMaxDelay(void) {return (float) memory_length * 1000.0f / AUDIO_SAMPLE_RATE_EXACT;} |
||||||
|
|
||||||
|
private:
|
||||||
|
void initialize(AudioEffectDelayMemoryType8_t type, uint32_t samples); |
||||||
|
inline static void SPIreadMany(int16_t* data, uint32_t samples); |
||||||
|
inline static void SPIwriteMany(const int16_t* data, uint32_t samples); |
||||||
|
//static uint32_t allocated[AUDIO_MEMORY8_UNDEFINED];
|
||||||
|
const static uint32_t memSizeSamples[AUDIO_MEMORY8_UNDEFINED]; |
||||||
|
static AudioExtMem8* first[AUDIO_MEMORY8_UNDEFINED]; // linked lists of all SPI memory types
|
||||||
|
AudioExtMem8* next; // next allocation after this one
|
||||||
|
void linkIn(void); // link new AudioExtMem8 object into allocation chain
|
||||||
|
void linkOut(void); // unlink this AudioExtMem8 object from allocation chain
|
||||||
|
static uint32_t findSpace(AudioEffectDelayMemoryType8_t memory_type, uint32_t samples); // find a space for a delay buffer
|
||||||
|
static uint32_t findMaxSpace(AudioEffectDelayMemoryType8_t memory_type); // find max available space for a delay buffer
|
||||||
|
uint32_t memory_begin; // the first address in the memory we're using
|
||||||
|
|
||||||
|
protected: |
||||||
|
void read(uint32_t address, uint32_t count, int16_t *data); |
||||||
|
void write(uint32_t address, uint32_t count, const int16_t *data); |
||||||
|
void zero(uint32_t address, uint32_t count) { |
||||||
|
write(address, count, NULL); |
||||||
|
} |
||||||
|
uint32_t memory_length; // the amount of memory we're using
|
||||||
|
uint32_t head_offset; // head index (incoming) data into external memory
|
||||||
|
AudioEffectDelayMemoryType8_t memory_type; // 0=23LC1024, 1=Frank's Memoryboard, etc.
|
||||||
|
}; |
||||||
|
|
||||||
|
#endif // _extmem8.h_
|
Loading…
Reference in new issue