tiva_i2c_slave.ino

//Energia 0101E0012 (03/18/2014)
// http://energia.nu/download/

#include <Wire.h>

//printf
#include <stdarg.h>
void p(char *fmt, ... ){
        char buf[128];
        va_list args;
        va_start (args, fmt );
        vsnprintf(buf, 128, fmt, args);
        va_end (args);
        Serial.print(buf);
}


void setup()
{
  // RGB led
  pinMode(RED_LED,OUTPUT);
  pinMode(GREEN_LED,OUTPUT);
  pinMode(BLUE_LED,OUTPUT);
  
  //
  Wire.begin(1); // slave address #1                
  //Wire.begin(2); // slave address #2
  //Wire.begin(3); // slave address #3
  Wire.onReceive(receiveEvent); 
  Wire.onRequest(requestEvent); 
  Serial.begin(115200);           
}

void loop()
{
  delay(100);
}

void receiveEvent(int rx_bytes)
{
  p("receiveEvent bytes=%d\r\n",rx_bytes);
  while(Wire.available()) 
  {
    byte c = Wire.read(); 
    p("i2c value=%02x\r\n",c);
    if(c==1) digitalWrite(RED_LED,1);
    if(c==2) digitalWrite(RED_LED,0);
    if(c==3) digitalWrite(GREEN_LED,1);
    if(c==4) digitalWrite(GREEN_LED,0);
    if(c==5) digitalWrite(BLUE_LED,1);
    if(c==6) digitalWrite(BLUE_LED,0);
  }
}


void requestEvent()
{
  p("requestEvent\r\n");
  
  
    uint32_t ulUser0, ulUser1;
    ROM_FlashUserGet(&ulUser0, &ulUser1);
    uint8_t* p_mac0;
    uint8_t* p_mac1;
    p_mac0 = (uint8_t*) &ulUser0;
    p_mac1 = (uint8_t*) &ulUser1;
    p("mac=%02x-%02x-%02x-%02x-%02x-%02x\r\n",p_mac0[0],p_mac0[1],p_mac0[2],p_mac1[0],p_mac1[1],p_mac1[2]);

    uint8_t buf[6];
    buf[0]=p_mac0[0];
    buf[1]=p_mac0[1];
    buf[2]=p_mac0[2];
    buf[3]=p_mac1[0];
    buf[4]=p_mac1[1];
    buf[5]=p_mac1[2];
    
    Wire.write(buf,6);
}