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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
# Configure pins based on the target.
if "alif" in sys.platform:
uart_id = 1
tx_pin = None
elif "rp2" in sys.platform:
uart_id = 0
tx_pin = "GPIO0"
rx_pin = "GPIO1"
elif "samd" in sys.platform and "ItsyBitsy M0" in sys.implementation._machine:
uart_id = 0
tx_pin = "D1"
rx_pin = "D0"
elif "samd" in sys.platform and "ItsyBitsy M4" in sys.implementation._machine:
uart_id = 3
tx_pin = "D1"
rx_pin = "D0"
elif "mimxrt" in sys.platform:
uart_id = 1
tx_pin = None
elif "nrf" in sys.platform:
uart_id = 0
tx_pin = None
else:
print("Please add support for this test on this platform.")
raise SystemExit
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):
if tx_pin is None:
uart = UART(uart_id, bits_per_s)
else:
uart = UART(uart_id, bits_per_s, tx=tx_pin, rx=rx_pin)
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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