Earle F. Philhower, III
07500e89db
Rewrite the I2S code from scratch to eliminate the dependence on the pico-extras implementation and to support I2S input as well. 8-bit, 16-bit, 24-bit, and 32-bit words are supported. Multiple I2S ports are allowed (theoretically up to 6 because 2 DMA channels are required per port). I2S input and I2S output are supported. Add input example Fixes #535 Fixes #99 Fixes #562
38 lines
893 B
Arduino
38 lines
893 B
Arduino
/*
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I2S stereo microphone (input) example
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Run using the Arduino Serial Plotter to see waveform.
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Released to the Public Domain by Earle F. Philhower, III
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For the Google AIY Voice Hat Microphone daughterboard, part
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of the Raspberry Pi AIY cardboard box, the I2S stereo pinout
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looking at the board top with the RPI logo on the left hand
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side:
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+-- ------------------------------------ --+
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left RPI | (1) GND (2) DIN (3) BCLK (4) LRCLK (5) 3.3V | AIY right
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logo +---------------------------------------------+ logo
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*/
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#include <I2S.h>
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I2S i2s(INPUT);
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void setup() {
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Serial.begin(115200);
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i2s.setDATA(0);
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i2s.setBCLK(1); // LRCLK = GP2
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i2s.setBitsPerSample(16);
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i2s.setFrequency(22050);
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i2s.begin();
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while (1) {
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int16_t l, r;
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i2s.read16(&l, &r);
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Serial.printf("%d %d\n", l, r);
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}
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}
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void loop() {
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/* Nothing here */
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}
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