arduino UART

#include <Arduino.h>
#define SYS_CLOCK_HZ 16000000
#define BAUD 9600

byte* sendBits= (byte*)malloc(8);
byte* buff=(char*) malloc(200);
int pos,sendPos;
char ch;
void setup()
{
    DDRA=0xFE;
    PORTA=0x04;
    Serial.begin(9600);




}



void writeSerial(byte* data,int cnt)
{


     //Set TX bit to low to start trasmission
    for(int i=0;i<cnt;i++)
    {
        for(int p=0;p<8;p++)
        {

         sendBits[p]=( ( data[i] & (1 << p) ) >>p );

        switch(sendBits[p])
        {
          case 1:
          Serial.write("1");
          break;
          case 0:
          Serial.write("0");
          break;




        }

        }
        sendPos=0;
        PORTA &= ~(0x04);
        while(sendPos<8)
        {
          delayMicroseconds(1000000/BAUD);
          PORTA=sendBits[sendPos++] << 2;

        }
        delayMicroseconds(1000000/BAUD);
        PORTA |= 0x04;
      }
    }





void loop()
{
    pos=0;
    while(Serial.available())
    {
        ch=Serial.read();
        if(ch!=13 && ch!=10)
          buff[pos++]=ch;

    }
    writeSerial(buff,pos);
}