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277b615f26
These require two boards wired together, SCL-SCL and SDA-SDA. Signed-off-by: Damien George <damien@micropython.org>
80 lines
2.3 KiB
Python
80 lines
2.3 KiB
Python
# Test basic use of I2CTarget and a memory buffer.
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#
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# Requires two instances with their SCL and SDA lines connected together.
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# Any combination of the below supported boards can be used.
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#
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# Notes:
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# - pull-up resistors may be needed
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# - alif use 1.8V signalling
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import sys
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from machine import I2C, I2CTarget
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ADDR = 67
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# Configure pins based on the target.
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if sys.platform == "alif":
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i2c_args = (1,) # pins P3_7/P3_6
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i2c_kwargs = {}
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elif sys.platform == "esp32":
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i2c_args = (1,) # on pins 9/8
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i2c_kwargs = {}
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elif sys.platform == "mimxrt":
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i2c_args = (0,) # pins 19/18 on Teensy 4.x
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i2c_kwargs = {}
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elif sys.platform == "rp2":
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i2c_args = (0,)
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i2c_kwargs = {"scl": 9, "sda": 8}
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elif sys.platform == "pyboard":
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i2c_args = ("Y",)
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i2c_kwargs = {}
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elif sys.platform == "samd":
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i2c_args = () # pins SCL/SDA
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i2c_kwargs = {}
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elif "zephyr-rpi_pico" in sys.implementation._machine:
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i2c_args = ("i2c1",) # on gpio7/gpio6
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i2c_kwargs = {}
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else:
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print("Please add support for this test on this platform.")
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raise SystemExit
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def simple_irq(i2c_target):
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flags = i2c_target.irq().flags()
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if flags & I2CTarget.IRQ_END_READ:
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print("IRQ_END_READ", i2c_target.memaddr)
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if flags & I2CTarget.IRQ_END_WRITE:
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print("IRQ_END_WRITE", i2c_target.memaddr)
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# I2C controller
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def instance0():
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i2c = I2C(*i2c_args, **i2c_kwargs)
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multitest.next()
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for iteration in range(2):
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print("controller iteration", iteration)
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multitest.wait("target stage 1")
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i2c.writeto_mem(ADDR, 2 + iteration, "0123")
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multitest.broadcast("controller stage 2")
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multitest.wait("target stage 3")
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print(i2c.readfrom_mem(ADDR, 2 + iteration, 4))
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multitest.broadcast("controller stage 4")
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print("done")
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# I2C target
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def instance1():
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buf = bytearray(b"--------")
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i2c_target = I2CTarget(*i2c_args, **i2c_kwargs, addr=ADDR, mem=buf)
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i2c_target.irq(simple_irq)
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multitest.next()
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for iteration in range(2):
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print("target iteration", iteration)
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multitest.broadcast("target stage 1")
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multitest.wait("controller stage 2")
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print(buf)
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multitest.broadcast("target stage 3")
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multitest.wait("controller stage 4")
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i2c_target.deinit()
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print("done")
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