40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
/***
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* We use the ESP32DMASPISlave library to implement the SPI slave on the ESP32
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* which receives the data
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*
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* Untested DRAFT implementation!
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*/
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#include <ESP32DMASPISlave.h>
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#include "AudioTools.h"
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const size_t BUFFER_SIZE = 1024;
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uint8_t *dma_rx_buf;
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ESP32DMASPI::Slave spi_slave;
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AudioInfo info(44100, 2, 16); //
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I2SStream out; // or replace with another output
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void setup() {
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Serial.begin(115200);
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// setup I2S
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auto cfg = out.defaultConfig(TX_MODE);
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cfg.copyFrom(info);
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//cfg.pin_bck = 14;
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//cfg.pin_ws = 15;
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//cfg.pin_data = 22;
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// to use DMA buffer, use these methods to allocate buffer
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dma_rx_buf = spi_slave.allocDMABuffer(BUFFER_SIZE);
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spi_slave.setDataMode(SPI_MODE0); // default: SPI_MODE0
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spi_slave.setMaxTransferSize(BUFFER_SIZE); // default: 4092 bytes
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// begin() after setting
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spi_slave.begin(); // default: HSPI (please refer README for pin assignments)
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}
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void loop() {
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// start and wait to complete one BIG transaction
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size_t received_bytes = spi_slave.transfer(nullptr, dma_rx_buf, BUFFER_SIZE);
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out.write(dma_rx_buf, received_bytes);
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}
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