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tests/extmod: Support esp32,mimxrt,stm32,samd ports in UART TX test.

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Getting this test running on stm32- and mimxrt-based boards requires adding
a small delay after constructing the UART so that the initial idle frame
has time to be transmitted before the test starts.

Also, the timing margin needs to account for an additional 1-bit worth of
time on some MCUs.

Thanks to @robert-hh for the esp32, mimxrt and samd settings.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2024-10-21 11:19:03 +11:00
parent 6328958a39
commit 3f54e5dff2
1 changed files with 29 additions and 5 deletions
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34
tests/extmod/machine_uart_tx.py
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@ -9,12 +9,34 @@ except ImportError:
import time, sys
initial_delay_ms = 0
bit_margin = 0
timing_margin_us = 100
# Configure pins based on the target.
if "rp2" in sys.platform:
if "esp32" in sys.platform:
uart_id = 1
pins = {}
timing_margin_us = 400
elif "mimxrt" in sys.platform:
uart_id = 1
pins = {}
initial_delay_ms = 20 # UART sends idle frame after init, so wait for that
bit_margin = 1
elif "pyboard" in sys.platform:
uart_id = 4
pins = {}
initial_delay_ms = 50 # UART sends idle frame after init, so wait for that
bit_margin = 1 # first start-bit must wait to sync with the UART clock
elif "rp2" in sys.platform:
uart_id = 0
tx_pin = "GPIO0"
rx_pin = "GPIO1"
pins = {"tx": "GPIO0", "rx": "GPIO1"}
timing_margin_us = 180
elif "samd" in sys.platform:
uart_id = 2
pins = {"tx": "D1", "rx": "D0"}
timing_margin_us = 300
bit_margin = 1
else:
print("SKIP")
raise SystemExit
@ -22,7 +44,8 @@ else:
# 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)
uart = UART(uart_id, bits_per_s, bits=8, parity=None, stop=1, **pins)
time.sleep_ms(initial_delay_ms)
start_us = time.ticks_us()
uart.write(text)
@ -33,4 +56,5 @@ for bits_per_s in (2400, 9600, 115200):
bits_per_char = 10
expect_us = (len(text)) * bits_per_char * 1_000_000 // bits_per_s
delta_us = abs(duration_us - expect_us)
print(bits_per_s, delta_us <= timing_margin_us or delta_us)
margin_us = timing_margin_us + bit_margin * 1_000_000 // bits_per_s
print(bits_per_s, delta_us <= margin_us or delta_us)