update com

2 files changed, 134 insertions, 0 deletions

diff --git a/comm/i2c/arduino_i2c_slave_1.py b/comm/i2c/arduino_i2c_slave_1.py
new file mode 100644
index 0000000..5957c5b
--- /dev/null
+++ b/comm/i2c/arduino_i2c_slave_1.py
@@ -0,0 +1,98 @@
+# This work is licensed under the MIT license.
+# Copyright (c) 2013-2023 OpenMV LLC. All rights reserved.
+# https://github.com/openmv/openmv/blob/master/LICENSE
+#
+# I2C with the Arduino as the master device and the OpenMV Cam as the slave.
+#
+# Please wire up your OpenMV Cam to your Arduino like this:
+#
+# OpenMV Cam Master I2C Data  (P5) - Arduino Uno Data  (A4)
+# OpenMV Cam Master I2C Clock (P4) - Arduino Uno Clock (A5)
+# OpenMV Cam Ground                - Arduino Ground
+
+import pyb
+import ustruct
+
+text = "Hello World!\n"
+data = ustruct.pack("<%ds" % len(text), text)
+# Use "ustruct" to build data packets to send.
+# "<" puts the data in the struct in little endian order.
+# "%ds" puts a string in the data stream. E.g. "13s" for "Hello World!\n" (13 chars).
+# See https://docs.python.org/3/library/struct.html
+
+# READ ME!!!
+#
+# Please understand that when your OpenMV Cam is not the I2C master it may miss responding to
+# sending data as a I2C slave no matter if you call "i2c.send()" in an interrupt callback or in the
+# main loop below. When this happens the Arduino will get a NAK and have to try reading from the
+# OpenMV Cam again. Note that both the Arduino and OpenMV Cam I2C drivers are not good at getting
+# unstuck after encountering any I2C errors. On the OpenMV Cam and Arduino you can recover by
+# de-initing and then re-initing the I2C peripherals.
+
+# The hardware I2C bus for your OpenMV Cam is always I2C bus 2.
+bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
+bus.deinit()  # Fully reset I2C device...
+bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
+print("Waiting for Arduino...")
+
+# Note that for sync up to work correctly the OpenMV Cam must be running this script before the
+# Arduino starts to poll the OpenMV Cam for data. Otherwise the I2C byte framing gets messed up,
+# and etc. So, keep the Arduino in reset until the OpenMV Cam is "Waiting for Arduino...".
+
+while True:
+    try:
+        bus.send(
+            ustruct.pack("<h", len(data)), timeout=10000
+        )  # Send the len first (16-bits).
+        try:
+            bus.send(data, timeout=10000)  # Send the data second.
+            print("Sent Data!")  # Only reached on no error.
+        except OSError as err:
+            pass  # Don't care about errors - so pass.
+            # Note that there are 3 possible errors. A timeout error, a general purpose error, or
+            # a busy error. The error codes are 116, 5, 16 respectively for "err.arg[0]".
+    except OSError as err:
+        pass  # Don't care about errors - so pass.
+        # Note that there are 3 possible errors. A timeout error, a general purpose error, or
+        # a busy error. The error codes are 116, 5, 16 respectively for "err.arg[0]".
+
+###################################################################################################
+# Arduino Code
+###################################################################################################
+#
+# #include <Wire.h>
+# #define BAUD_RATE 19200
+# #define CHAR_BUF 128
+#
+# void setup() {
+#   Serial.begin(BAUD_RATE);
+#   Wire.begin();
+#   delay(1000); // Give the OpenMV Cam time to bootup.
+# }
+#
+# void loop() {
+#   int32_t temp = 0;
+#   char buff[CHAR_BUF] = {0};
+#
+#   Wire.requestFrom(0x12, 2);
+#   if(Wire.available() == 2) { // got length?
+#
+#     temp = Wire.read() | (Wire.read() << 8);
+#     delay(1); // Give some setup time...
+#
+#     Wire.requestFrom(0x12, temp);
+#     if(Wire.available() == temp) { // got full message?
+#
+#       temp = 0;
+#       while(Wire.available()) buff[temp++] = Wire.read();
+#
+#     } else {
+#       while(Wire.available()) Wire.read(); // Toss garbage bytes.
+#     }
+#   } else {
+#     while(Wire.available()) Wire.read(); // Toss garbage bytes.
+#   }
+#
+#   Serial.print(buff);
+#   delay(1); // Don't loop to quickly.
+# }
diff --git a/comm/i2c/i2c_arduino_master/i2c_arduino_master.ino b/comm/i2c/i2c_arduino_master/i2c_arduino_master.ino
new file mode 100644
index 0000000..ff960ed
--- /dev/null
+++ b/comm/i2c/i2c_arduino_master/i2c_arduino_master.ino
@@ -0,0 +1,36 @@
+#include <Wire.h>
+#define BAUD_RATE 19200
+#define CHAR_BUF 128
+
+void setup() {
+  Serial.begin(BAUD_RATE);
+  Wire.begin();
+  delay(1000); // Give the OpenMV Cam time to bootup.
+}
+
+void loop() {
+  int32_t temp = 0;
+  char buff[CHAR_BUF] = {0};
+
+  Wire.requestFrom(0x12, 2);
+  if(Wire.available() == 2) { // got length?
+
+    temp = Wire.read() | (Wire.read() << 8);
+    delay(1); // Give some setup time...
+
+    Wire.requestFrom(0x12, temp);
+    if(Wire.available() == temp) { // got full message?
+
+      temp = 0;
+      while(Wire.available()) buff[temp++] = Wire.read();
+
+    } else {
+      while(Wire.available()) Wire.read(); // Toss garbage bytes.
+    }
+  } else {
+    while(Wire.available()) Wire.read(); // Toss garbage bytes.
+  }
+
+  Serial.print(buff);
+  delay(1); // Don't loop to quickly.
+}