/*       7-Segmet LED Control   attiny13a 9.6MHz
         2015/1/12    BY M.Kikuchi
Last     1/26      360 bytes
         config    76 ff
*/

char     I_cnt,SU,LED_Temp;
char     temp;
unsigned int     m_cunter;

char     LED_code[]={        // SU to 7segment data
         0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

char     com[]={             // 7segment control data
         0xd1,0xb1,0x71,0xe2,0xb2,0x72,0xc4,0x31};

void main()
{
         DDRB = 0b00000001;
         PORTB= 0;
         SU=0;
         LED_Temp=LED_code[SU];       // Copy & keep
     //
         m_cunter=0;
        while (1)
        {
           if (I_cnt !=0)
              LED_Temp >>= 1;
           if ((LED_Temp & 1)==0)
              PORTB=0;                   // Loop over
           else
            {
              temp = com[I_cnt];
              temp &= 0xf0;
              DDRB = ((temp >> 3) | 1);
              temp = com[I_cnt];
              temp &= 0x0f;
              PORTB=temp << 1;           // PB4,3,2,1
            }
           I_cnt ++;
           if (I_cnt==7)
            {
               I_cnt =0;
               LED_Temp=LED_code[SU];
            }
      //
         Delay_ms(1);
         m_cunter++;
         if (m_cunter==500)
            {
              m_cunter=0;
              SU++;
              if (SU==10)
                  SU=0;
              I_cnt=0;
              LED_Temp=LED_code[SU];
            }
        }
}