Wire: examples/i2c_eeprom_rxtx: add

Author: scpcom

libraries/Wire/examples/i2c_eeprom_rxtx/i2c_eeprom_rxtx.ino

@@ -0,0 +1,75 @@
+
+#include <Wire.h>
+
+/* I2C Test read/write AT24C02 */
+
+void i2c_eeprom_read_page(int deviceaddress, unsigned int eeaddress, int8_t len) {
+  uint8_t rdata = 0xFF;
+  uint8_t eeoff = (eeaddress*len);
+
+  eeaddress = eeoff;
+
+  Wire.beginTransmission(deviceaddress);
+  //Wire.write((int)(eeaddress >> 8)); // MSB
+  Wire.write((int)(eeaddress & 0xFF)); // LSB
+  Wire.endTransmission();
+  for (int i = 0; i < len; i++) {
+    Wire.requestFrom(deviceaddress,1);
+    if (Wire.available()) {
+      rdata = Wire.read();
+      Serial.printf("%02x ",rdata);
+    }
+  }
+    
+  Serial.println ();
+}
+
+void i2c_eeprom_write_page(int deviceaddress, unsigned int eeaddress, int8_t len) {
+  uint8_t rdata = 0;
+  uint8_t eeoff = (eeaddress*len);
+
+  eeaddress = eeoff;
+
+  for (int i = 0; i < len; i++) {
+    rdata = eeoff + i;
+    //rdata = 255-rdata;
+    Serial.printf("%02x ",rdata);
+    
+    Wire.beginTransmission(deviceaddress);
+    //Wire.write((int)(eeaddress >> 8)); // MSB
+    Wire.write((int)(eeaddress & 0xFF)); // LSB
+    Wire.write(rdata);
+    Wire.endTransmission();
+
+    eeaddress+=1;
+  }
+  
+  Serial.println ();
+}
+
+void setup() {
+  Serial.begin (115200);
+
+  // wait for serial port to connect
+  while (!Serial) 
+    {
+    }
+
+  Serial.println ();
+  Wire.begin();
+
+  Serial.println ("I2C Test writing ...");
+  for (int p = 0; p < 16; p++) {
+    i2c_eeprom_write_page(0x50, p, 16);
+  }
+  
+  Serial.println ("I2C Test reading ...");
+  for (int p = 0; p < 16; p++) {
+    i2c_eeprom_read_page(0x50, p, 16);
+  }
+  
+  Serial.println ("Done.");
+
+}  // end of setup
+
+void loop() {}