87 lines
2.1 KiB
Python
87 lines
2.1 KiB
Python
# Test machine.I2S data transfer rate, for both TX and RX.
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try:
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from machine import Pin, I2S
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except ImportError:
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print("SKIP")
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raise SystemExit
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import time, sys
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# Configure pins based on the board.
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if "pyboard" in sys.platform:
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i2s_id = 2
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sck_pin = Pin("Y6")
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ws_pin = Pin("Y5")
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sd_tx_pin = sd_rx_pin = Pin("Y8")
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elif "rp2" in sys.platform:
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i2s_id = 1
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sck_pin = Pin(0)
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ws_pin = Pin(1)
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sd_tx_pin = sd_rx_pin = Pin(2)
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elif "mimxrt" in sys.platform:
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i2s_id = 1
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sck_pin = Pin(26)
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ws_pin = Pin(27)
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sd_tx_pin = Pin(7)
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sd_rx_pin = Pin(8)
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TEST_BYTES = b"01234567"
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RATE = 11025 # frames/sec
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def test(mode, sd_pin, bits_per_sample, frame_format):
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i2s = I2S(
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i2s_id,
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sck=sck_pin,
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ws=ws_pin,
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sd=sd_pin,
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mode=mode,
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bits=bits_per_sample,
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format=frame_format,
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rate=RATE,
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ibuf=200,
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)
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if frame_format == I2S.MONO:
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channels = 1
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else:
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channels = 2
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bits_per_frame = bits_per_sample * channels
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buf_len_250ms = bits_per_frame // 8 * RATE // 4
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# Create test data and preload I2S buffers.
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if mode == I2S.TX:
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mode_str = "TX"
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data = TEST_BYTES * (buf_len_250ms // len(TEST_BYTES))
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i2s.write(data)
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else:
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mode_str = "RX"
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data = bytearray(len(TEST_BYTES) * (buf_len_250ms // len(TEST_BYTES)))
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i2s.readinto(data)
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# Time how long it takes to read/write 2 lots of data.
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t0 = time.ticks_ms()
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for i in range(2):
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if mode == I2S.TX:
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i2s.write(data)
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else:
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i2s.readinto(data)
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t1 = time.ticks_ms()
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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.
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print(mode_str, bits_per_sample, channels, abs(dt - 500) <= 4)
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test(I2S.TX, sd_tx_pin, 16, I2S.MONO)
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test(I2S.TX, sd_tx_pin, 16, I2S.STEREO)
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test(I2S.TX, sd_tx_pin, 32, I2S.MONO)
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test(I2S.TX, sd_tx_pin, 32, I2S.STEREO)
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test(I2S.RX, sd_rx_pin, 16, I2S.MONO)
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test(I2S.RX, sd_rx_pin, 16, I2S.STEREO)
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test(I2S.RX, sd_rx_pin, 32, I2S.MONO)
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test(I2S.RX, sd_rx_pin, 32, I2S.STEREO)
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