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