circuitpython/tests/wipy/uart.py

"""
UART test for the CC3200 based boards. 
UART0 and UART1 must be connected together for this test to pass.
"""

from machine import UART
from machine import Pin
import os
import time

mch = os.uname().machine
if "LaunchPad" in mch:
    uart_id_range = range(0, 2)
    uart_pins = [
        [("GP12", "GP13"), ("GP12", "GP13", "GP7", "GP6")],
        [("GP16", "GP17"), ("GP16", "GP17", "GP7", "GP6")],
    ]
elif "WiPy" in mch:
    uart_id_range = range(0, 2)
    uart_pins = [
        [("GP12", "GP13"), ("GP12", "GP13", "GP7", "GP6")],
        [("GP16", "GP17"), ("GP16", "GP17", "GP7", "GP6")],
    ]
else:
    raise Exception("Board not supported!")

# just in case we have the repl duplicated on any of the uarts
os.dupterm(None)

for uart_id in uart_id_range:
    uart = UART(uart_id, 38400)
    print(uart)
    uart.init(57600, 8, None, 1, pins=uart_pins[uart_id][0])
    uart.init(baudrate=9600, stop=2, parity=UART.EVEN, pins=uart_pins[uart_id][1])
    uart.init(baudrate=115200, parity=UART.ODD, stop=0, pins=uart_pins[uart_id][0])
    uart = UART(baudrate=1000000)
    uart.sendbreak()

uart = UART(baudrate=1000000)
uart = UART()
print(uart)
uart = UART(baudrate=38400, pins=("GP12", "GP13"))
print(uart)
uart = UART(pins=("GP12", "GP13"))
print(uart)
uart = UART(pins=(None, "GP17"))
print(uart)
uart = UART(baudrate=57600, pins=("GP16", "GP17"))
print(uart)

# now it's time for some loopback tests between the uarts
uart0 = UART(0, 1000000, pins=uart_pins[0][0])
print(uart0)
uart1 = UART(1, 1000000, pins=uart_pins[1][0])
print(uart1)

print(uart0.write(b"123456") == 6)
print(uart1.read() == b"123456")

print(uart1.write(b"123") == 3)
print(uart0.read(1) == b"1")
print(uart0.read(2) == b"23")
print(uart0.read() == None)

uart0.write(b"123")
buf = bytearray(3)
print(uart1.readinto(buf, 1) == 1)
print(buf)
print(uart1.readinto(buf) == 2)
print(buf)

# try initializing without the id
uart0 = UART(baudrate=1000000, pins=uart_pins[0][0])
uart0.write(b"1234567890")
time.sleep_ms(2)  # because of the fifo interrupt levels
print(uart1.any() == 10)
print(uart1.readline() == b"1234567890")
print(uart1.any() == 0)

uart0.write(b"1234567890")
print(uart1.read() == b"1234567890")

# tx only mode
uart0 = UART(0, 1000000, pins=("GP12", None))
print(uart0.write(b"123456") == 6)
print(uart1.read() == b"123456")
print(uart1.write(b"123") == 3)
print(uart0.read() == None)

# rx only mode
uart0 = UART(0, 1000000, pins=(None, "GP13"))
print(uart0.write(b"123456") == 6)
print(uart1.read() == None)
print(uart1.write(b"123") == 3)
print(uart0.read() == b"123")

# leave pins as they were (rx only mode)
uart0 = UART(0, 1000000, pins=None)
print(uart0.write(b"123456") == 6)
print(uart1.read() == None)
print(uart1.write(b"123") == 3)
print(uart0.read() == b"123")

# no pin assignment
uart0 = UART(0, 1000000, pins=(None, None))
print(uart0.write(b"123456789") == 9)
print(uart1.read() == None)
print(uart1.write(b"123456789") == 9)
print(uart0.read() == None)
print(Pin.board.GP12)
print(Pin.board.GP13)

# check for memory leaks...
for i in range(0, 1000):
    uart0 = UART(0, 1000000)
    uart1 = UART(1, 1000000)

# next ones must raise
try:
    UART(0, 9600, parity=None, pins=("GP12", "GP13", "GP7"))
except Exception:
    print("Exception")

try:
    UART(0, 9600, parity=UART.ODD, pins=("GP12", "GP7"))
except Exception:
    print("Exception")

uart0 = UART(0, 1000000)
uart0.deinit()
try:
    uart0.any()
except Exception:
    print("Exception")

try:
    uart0.read()
except Exception:
    print("Exception")

try:
    uart0.write("abc")
except Exception:
    print("Exception")

try:
    uart0.sendbreak("abc")
except Exception:
    print("Exception")

try:
    UART(2, 9600)
except Exception:
    print("Exception")

for uart_id in uart_id_range:
    uart = UART(uart_id, 1000000)
    uart.deinit()
    # test printing an unitialized uart
    print(uart)
    # initialize it back and check that it works again
    uart.init(115200)
    print(uart)
    uart.read()