c6bc9c48c9
tested on metro m7 (green prototype version) with max98357a i2s amplifier and the following test code:
```py
import board
import time
import digitalio
from audiobusio import I2SOut
from audiocore import RawSample
from microcontroller import pin
from ulab import numpy as np
n = np.array(np.sin(np.linspace(0, np.pi*2, 218, endpoint=False)) * 200, dtype=np.int16)
print(n)
r = RawSample(n, sample_rate=8000, channel_count=2)
def main():
with digitalio.DigitalInOut(board.LED) as l:
l.switch_to_output(True)
value = False
while True:
with I2SOut(pin.GPIO_06, pin.GPIO_07, pin.GPIO_04) as i:
time.sleep(.01)
l.value = value = not value
i.play(r, loop=True)
print(i.playing)
time.sleep(.5)
i.stop()
print("STOPPED")
print(i.playing)
time.sleep(.5)
i.play(r, loop=True)
print(i.playing)
print("PLAY AGAIN")
time.sleep(.5)
time.sleep(1)
```
Only stereo, 16-bit, raw samples were tested; the sample rate is actually fixed
at 48kHz in the core right now. There is more to do, but the basics work.
# Conflicts:
# ports/mimxrt10xx/Makefile
# ports/mimxrt10xx/mpconfigport.mk
60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2020 Jeff Epler for Adafruit Industries
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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 and this permission notice shall be included in
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* 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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#pragma once
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#include "sdk/drivers/sai/fsl_sai.h"
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#include "py/obj.h"
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#include "supervisor/background_callback.h"
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typedef struct {
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I2S_Type *peripheral;
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sai_handle_t handle;
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mp_obj_t sample;
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uint32_t *buffers[SAI_XFER_QUEUE_SIZE];
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uint8_t *sample_data, *sample_end;
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background_callback_t callback;
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bool playing, paused, loop, stopping;
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bool samples_signed;
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uint8_t channel_count, bytes_per_sample;
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uint8_t buffer_idx;
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uint32_t sample_rate;
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} i2s_t;
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void i2s_reset(void);
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void port_i2s_initialize(i2s_t *self, int instance, sai_transceiver_t *config);
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void port_i2s_deinit(i2s_t *self);
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bool port_i2s_deinited(i2s_t *self);
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void port_i2s_play(i2s_t *self, mp_obj_t sample, bool loop);
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void port_i2s_stop(i2s_t *self);
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bool port_i2s_get_playing(i2s_t *self);
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bool port_i2s_get_paused(i2s_t *self);
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void port_i2s_pause(i2s_t *self);
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void port_i2s_resume(i2s_t *self);
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