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tests/extmod: Add test for machine.I2S data rate.
Signed-off-by: Damien George <damien@micropython.org>
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# Test machine.I2S data transfer rate, for both TX and RX. | ||
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try: | ||
from machine import Pin, I2S | ||
except ImportError: | ||
print("SKIP") | ||
raise SystemExit | ||
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import time, sys | ||
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# Configure pins based on the board. | ||
if "pyboard" in sys.platform: | ||
i2s_id = 2 | ||
sck_pin = Pin("Y6") | ||
ws_pin = Pin("Y5") | ||
sd_pin = Pin("Y8") | ||
elif "rp2" in sys.platform: | ||
i2s_id = 1 | ||
sck_pin = Pin(0) | ||
ws_pin = Pin(1) | ||
sd_pin = Pin(2) | ||
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TEST_BYTES = b"01234567" | ||
RATE = 11025 # frames/sec | ||
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def test(mode, bits_per_sample, frame_format): | ||
i2s = I2S( | ||
i2s_id, | ||
sck=sck_pin, | ||
ws=ws_pin, | ||
sd=sd_pin, | ||
mode=mode, | ||
bits=bits_per_sample, | ||
format=frame_format, | ||
rate=RATE, | ||
ibuf=200, | ||
) | ||
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if frame_format == I2S.MONO: | ||
channels = 1 | ||
else: | ||
channels = 2 | ||
bits_per_frame = bits_per_sample * channels | ||
buf_len_250ms = bits_per_frame // 8 * RATE // 4 | ||
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# Create test data and preload I2S buffers. | ||
if mode == I2S.TX: | ||
mode_str = "TX" | ||
data = TEST_BYTES * (buf_len_250ms // len(TEST_BYTES)) | ||
i2s.write(data) | ||
else: | ||
mode_str = "RX" | ||
data = bytearray(len(TEST_BYTES) * (buf_len_250ms // len(TEST_BYTES))) | ||
i2s.readinto(data) | ||
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# Time how long it takes to read/write 2 lots of data. | ||
t0 = time.ticks_ms() | ||
for i in range(2): | ||
if mode == I2S.TX: | ||
i2s.write(data) | ||
else: | ||
i2s.readinto(data) | ||
t1 = time.ticks_ms() | ||
dt = time.ticks_diff(t1, t0) | ||
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i2s.deinit() | ||
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# Print out test result, time should be in range of 500ms. | ||
print(mode_str, bits_per_sample, channels, abs(dt - 500) <= 4) | ||
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test(I2S.TX, 16, I2S.MONO) | ||
test(I2S.TX, 16, I2S.STEREO) | ||
test(I2S.TX, 32, I2S.MONO) | ||
test(I2S.TX, 32, I2S.STEREO) | ||
test(I2S.RX, 16, I2S.MONO) | ||
test(I2S.RX, 16, I2S.STEREO) | ||
test(I2S.RX, 32, I2S.MONO) | ||
test(I2S.RX, 32, I2S.STEREO) |
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TX 16 1 True | ||
TX 16 2 True | ||
TX 32 1 True | ||
TX 32 2 True | ||
RX 16 1 True | ||
RX 16 2 True | ||
RX 32 1 True | ||
RX 32 2 True |