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# Test machine.UART.IRQ_TXIDLE firing after a transmission.
# Does not require any external connections.
try:
from machine import UART
UART.IRQ_TXIDLE
except (ImportError, AttributeError):
print("SKIP")
raise SystemExit
import time, sys
from target_wiring import uart_loopback_args, uart_loopback_kwargs
def irq(u):
print("IRQ_TXIDLE:", u.irq().flags() == u.IRQ_TXIDLE)
text = "Hello World" * 20
# Test that the IRQ is called after the write has completed.
for bits_per_s in (2400, 9600, 115200):
uart = UART(*uart_loopback_args, baudrate=bits_per_s, **uart_loopback_kwargs)
uart.irq(irq, uart.IRQ_TXIDLE)
# The IRQ_TXIDLE shall trigger after the message has been sent. Thus
# the test marks a time window close to the expected of the sending
# and the time at which the IRQ should have been fired.
# It is just a rough estimation of 10 characters before and
# 20 characters after the data's end.
bits_per_char = 10 # 1(startbit) + 8(bits) + 1(stopbit) + 0(parity)
start_time_us = (len(text) - 10) * bits_per_char * 1_000_000 // bits_per_s
window_ms = 20 * bits_per_char * 1_000 // bits_per_s + 1
print("write", bits_per_s)
uart.write(text)
time.sleep_us(start_time_us)
print("ready")
time.sleep_ms(window_ms)
print("done")
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