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i2c_256_master_t4.ino

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+#include <Arduino.h>
+#include <i2c_device.h>
+
+#define SLAVE_ADDR 0x08
+#define BUFFER_SIZE 256
+
+i2c_device i2c = i2c_device(Wire, SLAVE_ADDR);  // Use default Wire (I2C1)
+
+uint8_t dataBuffer[BUFFER_SIZE];
+
+void setup() {
+    Wire.begin();
+    Wire.setClock(1000000);  // Set I2C clock speed to 1 MHz
+
+    // Fill buffer with test data
+    for (int i = 0; i < BUFFER_SIZE; i++) {
+        dataBuffer[i] = i;
+    }
+
+    delay(1000);  // Allow slave to initialize
+}
+
+void loop() {
+    i2c.write(dataBuffer, BUFFER_SIZE);  // Send full 256 bytes in one transaction
+
+    delay(10);  // Small delay before next transmission
+}

i2c_256_slave_t4.ino

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+#include <Teensy4I2C.h>
+
+#define SLAVE_ADDR 0x08
+#define BUFFER_SIZE 256
+
+uint8_t receivedData[BUFFER_SIZE];
+
+void receiveEvent(size_t count) {
+    I2C.read(receivedData, count);
+}
+
+void setup() {
+    I2C.begin(SLAVE_ADDR);
+    I2C.onReceive(receiveEvent);
+    Serial.begin(115200);
+}
+
+void loop() {
+    delay(500);
+    Serial.print("Received Data: ");
+    for (int i = 0; i < BUFFER_SIZE; i++) {
+        Serial.print(receivedData[i], HEX);
+        Serial.print(" ");
+    }
+    Serial.println();
+}

i2c_master.ino

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+#include <Wire.h>
+#define SLAVE_ADDRESS   0x20
+
+void setup()
+{
+  Wire.setClock(1000000);
+  Serial.begin(9600);
+  Wire.begin();
+}
+
+void loop() 
+{
+  Wire.beginTransmission(SLAVE_ADDRESS);
+  Wire.write(0x09);
+  byte busStatus = Wire.endTransmission();
+  if(busStatus !=0)
+  {
+    Serial.println("I2C Bus error!");
+    while(true);
+  }
+  Serial.println("Data Transmission is ok!");
+  //--------------------------------------
+  Wire.requestFrom(SLAVE_ADDRESS, 1);
+  byte m = Wire.read();
+  Serial.println(m, HEX);  //should show: 7
+  delay(1000);
+}

i2c_slave.ino

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+#include <Wire.h>
+#define SLAVE_ADDRESS   0x20
+byte  reTxData;
+volatile bool flag = false;
+
+void setup()
+{
+  Wire.setClock(1000000);
+  Serial.begin(9600);
+  Wire.onReceive(receiveEvent);
+  Wire.onRequest(sendEvent);
+  Wire.begin(SLAVE_ADDRESS);
+}
+
+void loop()
+{
+  if (flag == true)
+  {
+    Serial.print("Data received from Master: ");
+    Serial.println(reTxData);
+    flag = false;
+  }
+}
+
+void receiveEvent(int numBytes)
+{
+  reTxData = Wire.read();
+  flag = true;
+}
+
+void sendEvent()
+{
+  Wire.write(reTxData);
+}