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# Test machine.UART transmission.
# Does not require any external connections.
try:
from machine import UART
except ImportError:
print("SKIP")
raise SystemExit
import time, sys
# Configure pins based on the target.
if "rp2" in sys.platform:
uart_id = 0
tx_pin = "GPIO0"
rx_pin = "GPIO1"
else:
print("SKIP")
raise SystemExit
# Test that write+flush takes the expected amount of time to execute.
for bits_per_s in (2400, 9600, 115200):
text = "Hello World"
uart = UART(uart_id, bits_per_s, bits=8, parity=None, stop=1, tx=tx_pin, rx=rx_pin)
start_us = time.ticks_us()
uart.write(text)
uart.flush()
duration_us = time.ticks_diff(time.ticks_us(), start_us)
# 1(startbit) + 8(bits) + 1(stopbit) + 0(parity)
bits_per_char = 10
expect_us = (len(text)) * bits_per_char * 1_000_000 // bits_per_s
print(bits_per_s, duration_us <= expect_us)
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