From 4aa63fd4ecb95e1d693c2135aefd133a1436752f Mon Sep 17 00:00:00 2001
From: Liz <liz@adafruit.com>
Date: Thu, 11 Jul 2024 12:27:11 -0400
Subject: [PATCH 1/2] rs-232 pal demos

CircuitPython and Arduino RS-232 Pal demos. uses serial console to send commands
---
 .../Arduino_RS-232_Pal/.uno.test.only         |  0
 .../Arduino_RS-232_Pal/Arduino_RS-232_Pal.ino | 46 +++++++++++++++++++
 RS-232_Pal_Demos/CircuitPython/code.py        | 32 +++++++++++++
 3 files changed, 78 insertions(+)
 create mode 100644 RS-232_Pal_Demos/Arduino_RS-232_Pal/.uno.test.only
 create mode 100644 RS-232_Pal_Demos/Arduino_RS-232_Pal/Arduino_RS-232_Pal.ino
 create mode 100644 RS-232_Pal_Demos/CircuitPython/code.py

diff --git a/RS-232_Pal_Demos/Arduino_RS-232_Pal/.uno.test.only b/RS-232_Pal_Demos/Arduino_RS-232_Pal/.uno.test.only
new file mode 100644
index 000000000..e69de29bb
diff --git a/RS-232_Pal_Demos/Arduino_RS-232_Pal/Arduino_RS-232_Pal.ino b/RS-232_Pal_Demos/Arduino_RS-232_Pal/Arduino_RS-232_Pal.ino
new file mode 100644
index 000000000..d65dd108d
--- /dev/null
+++ b/RS-232_Pal_Demos/Arduino_RS-232_Pal/Arduino_RS-232_Pal.ino
@@ -0,0 +1,46 @@
+// SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <SoftwareSerial.h>
+
+// update this for your RS-232 device baud rate
+#define baud 38400
+// define RX and TX pins for the software serial port
+#define RS232_RX_PIN 2
+#define RS232_TX_PIN 3
+
+SoftwareSerial rs232Serial(RS232_RX_PIN, RS232_TX_PIN);
+
+void setup() {
+  Serial.begin(115200);
+  while ( !Serial ) delay(10);
+
+  rs232Serial.begin(baud);
+
+  Serial.println("Enter commands to send to the RS-232 device.");
+  Serial.println();
+}
+
+void loop() {
+
+  if (Serial.available() > 0) {
+    String userInput = Serial.readStringUntil('\n');
+    userInput.trim();  // remove any trailing newlines or spaces
+    if (userInput.length() > 0) {
+      // send the command with a telnet newline (CR + LF)
+      rs232Serial.print(userInput + "\r\n");
+      Serial.print("Sent: ");
+      Serial.println(userInput);
+    }
+  }
+
+  // check for incoming data from RS-232 device
+  while (rs232Serial.available() > 0) {
+    char response = rs232Serial.read();
+    // print the incoming data
+    Serial.print(response);
+  }
+
+  delay(50);
+}
diff --git a/RS-232_Pal_Demos/CircuitPython/code.py b/RS-232_Pal_Demos/CircuitPython/code.py
new file mode 100644
index 000000000..a7ab3613b
--- /dev/null
+++ b/RS-232_Pal_Demos/CircuitPython/code.py
@@ -0,0 +1,32 @@
+# SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import busio
+
+# baud rate for your device
+baud = 38400
+uart = busio.UART(board.TX, board.RX, baudrate=baud)
+
+print("Enter commands to send to the RS-232 device. Press Ctrl+C to exit.")
+while True:
+    user_input = input("Please enter your command: ").strip()
+    if user_input:
+        # send the command with a telnet newline (CR + LF)
+        uart.write((user_input + "\r\n").encode('ascii'))
+
+    # empty buffer to collect the incoming data
+    response_buffer = bytearray()
+
+    # check for data
+    time.sleep(1)
+    while uart.in_waiting:
+        data = uart.read(uart.in_waiting)
+        if data:
+            response_buffer.extend(data)
+
+    # decode and print
+    if response_buffer:
+        print(response_buffer.decode('ascii'), end='')
+        print()

From b5ee85acea231a2b33efe6630a04a1239625f0fa Mon Sep 17 00:00:00 2001
From: Liz <liz@adafruit.com>
Date: Thu, 11 Jul 2024 14:53:26 -0400
Subject: [PATCH 2/2] update for rpi

---
 RS-232_Pal_Demos/CircuitPython/code.py | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/RS-232_Pal_Demos/CircuitPython/code.py b/RS-232_Pal_Demos/CircuitPython/code.py
index a7ab3613b..a5e6fa332 100644
--- a/RS-232_Pal_Demos/CircuitPython/code.py
+++ b/RS-232_Pal_Demos/CircuitPython/code.py
@@ -3,11 +3,21 @@
 
 import time
 import board
-import busio
 
 # baud rate for your device
 baud = 38400
-uart = busio.UART(board.TX, board.RX, baudrate=baud)
+# Initialize UART for the CH9328
+# check for Raspberry Pi
+# pylint: disable=simplifiable-condition
+if "CE0" and "CE1" in dir(board):
+    import serial
+
+    uart = serial.Serial("/dev/ttyS0", baudrate=baud, timeout=3000)
+# otherwise use busio
+else:
+    import busio
+
+    uart = busio.UART(board.TX, board.RX, baudrate=baud)
 
 print("Enter commands to send to the RS-232 device. Press Ctrl+C to exit.")
 while True: