circuitpython/tests/wipy/uart.py

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

from pyb import UART
from pyb import Pin
import os
import pyb

machine = os.uname().machine
if 'LaunchPad' in machine:
    uart_id_range = range(0, 2)
    uart_pins = [[('GP12', 'GP13'), ('GP12', 'GP13', 'GP7', 'GP6')], [('GP16', 'GP17'), ('GP16', 'GP17', 'GP7', 'GP6')]]
elif 'WiPy' in machine:
    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!')

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

# 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() == b'')

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

uart0.write(b'1234567890')
pyb.delay(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.readall() == 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() == b'')

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

# no pin assignemnt
uart0 = UART(0, 1000000, pins=(None, None))
print(uart0.write(b'123456789') == 9)
print(uart1.read() == b'')
print(uart1.write(b'123456789') == 9)
print(uart0.read() == b'')
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=2, pins=('GP12', 'GP13', 'GP7'))
except Exception:
    print('Exception')

try:
    UART(0, 9600, parity=2, pins=('GP12', 'GP7'))
except Exception:
    print('Exception')

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

uart0 = UART(0, 1000000)
uart0.deinit()
try:
    uart0.read()
except Exception:
    print('Exception')

uart0 = UART(0, 1000000)
uart0.deinit()
try:
    uart0.write('abc')
except Exception:
    print('Exception')

uart0 = UART(0, 1000000)
uart0.deinit()
try:
    uart0.sendbreak('abc')
except Exception:
    print('Exception')