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# Test machine.I2S data transfer rate, for both TX and RX.
try:
from machine import Pin, I2S
except ImportError:
print("SKIP")
raise SystemExit
import time, sys
# Configure pins based on the board.
if "pyboard" in sys.platform:
i2s_id = 2
sck_pin = Pin("Y6")
ws_pin = Pin("Y5")
sd_tx_pin = sd_rx_pin = Pin("Y8")
elif "rp2" in sys.platform:
i2s_id = 1
sck_pin = Pin(0)
ws_pin = Pin(1)
sd_tx_pin = sd_rx_pin = Pin(2)
elif "mimxrt" in sys.platform:
i2s_id = 1
sck_pin = Pin(26)
ws_pin = Pin(27)
sd_tx_pin = Pin(7)
sd_rx_pin = Pin(8)
TEST_BYTES = b"01234567"
RATE = 11025 # frames/sec
def test(mode, sd_pin, 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,
)
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
# 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)
# 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)
i2s.deinit()
# Print out test result, time should be in range of 500ms.
print(mode_str, bits_per_sample, channels, abs(dt - 500) <= 4)
test(I2S.TX, sd_tx_pin, 16, I2S.MONO)
test(I2S.TX, sd_tx_pin, 16, I2S.STEREO)
test(I2S.TX, sd_tx_pin, 32, I2S.MONO)
test(I2S.TX, sd_tx_pin, 32, I2S.STEREO)
test(I2S.RX, sd_rx_pin, 16, I2S.MONO)
test(I2S.RX, sd_rx_pin, 16, I2S.STEREO)
test(I2S.RX, sd_rx_pin, 32, I2S.MONO)
test(I2S.RX, sd_rx_pin, 32, I2S.STEREO)
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