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
30 lines
666 B
Makefile
30 lines
666 B
Makefile
LD_FILE = $(FLASH).ld $(CHIP_FAMILY).ld imxrt10xx.ld
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INTERNAL_LIBM = 1
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USB_HIGHSPEED = 1
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# Number of USB endpoint pairs.
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USB_NUM_ENDPOINT_PAIRS = 8
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# Align buffers on the cache boundary so we don't inadvertently load them early.
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CIRCUITPY_TUSB_MEM_ALIGN = 32
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INTERNAL_FLASH_FILESYSTEM = 1
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CIRCUITPY_AUDIOBUSIO = 1
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CIRCUITPY_AUDIOBUSIO_PDMIN = 0
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CIRCUITPY_AUDIOCORE = 1
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CIRCUITPY_AUDIOIO = 0
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CIRCUITPY_BUSDEVICE = 1
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CIRCUITPY_COUNTIO = 0
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CIRCUITPY_FREQUENCYIO = 0
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CIRCUITPY_I2CTARGET = 0
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CIRCUITPY_NVM = 0
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CIRCUITPY_PARALLELDISPLAY = 0
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CIRCUITPY_PULSEIO = 0
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CIRCUITPY_ROTARYIO = 0
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CIRCUITPY_USB_MIDI = 1
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LONGINT_IMPL = MPZ
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CIRCUITPY_BUILD_EXTENSIONS ?= hex,uf2
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