1 files changed, 62 insertions, 0 deletions
diff --git a/tests/extmod_hardware/machine_uart_irq_break.py b/tests/extmod_hardware/machine_uart_irq_break.py
new file mode 100644
index 0000000000..82879c1d6e
--- /dev/null
+++ b/tests/extmod_hardware/machine_uart_irq_break.py
@@ -0,0 +1,62 @@
+# Test machine.UART.IRQ_BREAK firing after a break is received.
+#
+# IMPORTANT: This test requires hardware connections: the UART TX and RX
+# pins must be wired together.
+
+try:
+    from machine import UART
+
+    UART.IRQ_BREAK
+except (ImportError, AttributeError):
+    print("SKIP")
+    raise SystemExit
+
+import time, sys
+
+# Configure pins based on the target.
+if "esp32" in sys.platform:
+    if "ESP32S2" in sys.implementation._machine or "ESP32C3" in sys.implementation._machine:
+        print("SKIP")
+        raise SystemExit
+    # ESP32 needs separate UART instances for the test
+    recv_uart_id = 1
+    recv_tx_pin = 14
+    recv_rx_pin = 5
+    send_uart_id = 2
+    send_tx_pin = 4
+    send_rx_pin = 12
+elif "rp2" in sys.platform:
+    recv_uart_id = 0
+    send_uart_id = 0
+    recv_tx_pin = "GPIO0"
+    recv_rx_pin = "GPIO1"
+else:
+    print("Please add support for this test on this platform.")
+    raise SystemExit
+
+
+def irq(u):
+    print("IRQ_BREAK:", bool(u.irq().flags() & u.IRQ_BREAK), "data:", u.read(1))
+
+
+# Test that the IRQ is called for each break received.
+for bits_per_s in (2400, 9600, 57600):
+    recv_uart = UART(recv_uart_id, bits_per_s, tx=recv_tx_pin, rx=recv_rx_pin)
+    if recv_uart_id != send_uart_id:
+        send_uart = UART(send_uart_id, bits_per_s, tx=send_tx_pin, rx=send_rx_pin)
+    else:
+        send_uart = recv_uart
+
+    recv_uart.irq(irq, recv_uart.IRQ_BREAK)
+
+    print("write", bits_per_s)
+    for i in range(3):
+        send_uart.write(str(i))
+        send_uart.flush()
+        time.sleep_ms(10)
+        send_uart.sendbreak()
+        time.sleep_ms(10)
+        if "esp32" in sys.platform:
+            # On esp32 a read is needed to read in the break byte.
+            recv_uart.read()
+    print("done")