BT_Lights.ino

/* BT_Lights Demo App for Use With MIT App Inventor
This sketch is forked from a demo sketch written by Steve Chang
 
This demo code is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
 
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
 
#include <SoftwareSerial.h>   //Software Serial Port
#include <avr/pgmspace.h>

#define DATA_1 (PORTC |=  0X01)    // DATA 1    // for UNO
#define DATA_0 (PORTC &=  0XFE)    // DATA 0    // for UNO
#define STRIP_PINOUT (DDRC=0xFF)    // for UNO

#define RxD 6
#define TxD 7
#define LED 13
 
#define DEBUG_ENABLED  1

String valRead = "";

uint32_t intensityR = 0;
uint32_t intensityG = 0;
uint32_t intensityB = 0;
uint32_t overallIntensity = 0;
 
SoftwareSerial blueToothSerial(RxD,TxD);
 
void setup() 
{ 
  Serial.begin(9600);
  pinMode(RxD, INPUT);
  pinMode(TxD, OUTPUT);
  pinMode(LED, OUTPUT);
  setupBlueToothConnection();
  STRIP_PINOUT;       
  reset_strip();
} 
 
void loop() 
{ 
  char recvChar;
  while(1){
    if(blueToothSerial.available()) {
      recvChar = blueToothSerial.read();

      switch (recvChar) {
        case 'R':
          Serial.print("RED: ");
          valRead = blueToothSerial.readStringUntil('\n');
          //valRead.trim();
          intensityR = valRead.toInt();
          Serial.println(intensityR);
          overallIntensity = (intensityB<<8)|(intensityG<<16)|intensityR;
          for (int x = 0; x<10; x++) {
            send_strip(overallIntensity);
          }
          break;
         
         case 'G':
           Serial.print("GREEN: ");
           valRead = blueToothSerial.readStringUntil('\n');
           //valRead.trim();
           intensityG = valRead.toInt();
           Serial.println(intensityG);
           overallIntensity = (intensityB<<8)|(intensityG<<16)|intensityR;
           for (int x = 0; x<10; x++) {
             send_strip(overallIntensity);
           }
           break;
           
           
        case 'B':
          Serial.print("BLUE: ");
          valRead = blueToothSerial.readStringUntil('\n');
          //valRead.trim();
          intensityB = valRead.toInt();
          Serial.println(intensityB);
          overallIntensity = (intensityB<<8)|(intensityG<<16)|intensityR;
          for (int x = 0; x<10; x++) {
            send_strip(overallIntensity);
          }
          break;
      }
      
      Serial.println(overallIntensity);
      
    }
    
    if(Serial.available()){//check if there's any data sent from the local serial terminal, you can add the other applications here
      recvChar  = Serial.read();
      blueToothSerial.print(recvChar);
    }
  }
} 
 
void setupBlueToothConnection()
{
  blueToothSerial.begin(38400); //Set BluetoothBee BaudRate to default baud rate 38400
  blueToothSerial.print("\r\n+STWMOD=0\r\n"); //set the bluetooth work in slave mode
  blueToothSerial.print("\r\n+STNA=BTLights\r\n"); //set the bluetooth name as "BTLights"
  blueToothSerial.print("\r\n+STOAUT=1\r\n"); // Permit Paired device to connect me
  blueToothSerial.print("\r\n+STAUTO=0\r\n"); // Auto-connection should be forbidden here
  delay(2000); // This delay is required.
  blueToothSerial.print("\r\n+INQ=1\r\n"); //make the slave bluetooth inquirable 
  Serial.println("The slave bluetooth is inquirable!");
  delay(2000); // This delay is required.
  blueToothSerial.flush();
}



/*******************************************************************************
 * Function Name  : send_strip
 * Description    : Transmit 24 pulse to LED strip
 *                  
 * Input          : 24-bit data for the strip
 *                  
 * Output         : None
 * Return         : None
 *******************************************************************************/
void send_strip(uint32_t data)
{
  int i;
  unsigned long j=0x800000;
  
 
  for (i=0;i<24;i++)
  {
    if (data & j)
    {
      DATA_1;
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");    
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      
/*----------------------------*/
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");  
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");  
      __asm__("nop\n\t");  
      __asm__("nop\n\t");        
/*----------------------------*/      
      DATA_0;
    }
    else
    {
      DATA_1;
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");    
      DATA_0;
/*----------------------------*/      
       __asm__("nop\n\t");
      __asm__("nop\n\t");
      __asm__("nop\n\t");      
/*----------------------------*/         
    }

    j>>=1;
  }


  
}

/*******************************************************************************
 * Function Name  : reset_strip
 * Description    : Send reset pulse to reset all color of the strip
 *                  
 * Input          : None
 *                  
 * Output         : None
 * Return         : None
 *******************************************************************************/
void	reset_strip()
{
  DATA_0;
  delayMicroseconds(20);
}