DMX Senderoutine am PIC in C

#include <16F876a.h>

#device adc=8

#use delay(clock=20000000)

#fuses HS,NOWDT,NOPROTECT,NOLVP

#use rs232(baud=250000,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=9,stream=DMXX)

#bit bit_nine = 0x98.0

#use rs232(baud=115200,parity=N,xmit=PIN_B0,rcv=PIN_B1,bits=9,stream=PC)

#define        sn75176 PIN_C3    //high: transmit low: receive

#define        DMXANZ 10

unsigned char  value[DMXANZ];

unsigned int   dmxnum;  

unsigned int   status;

int            WAIT = 10;

#int_TIMER2

void TIMER2_isr()    //10ms

{

   set_adc_channel( 0 );        

   delay_us(WAIT);     

   value[3] = read_ADC();       //Wert für Kanal 3 per Poti einlesen

   set_adc_channel( 1 );

   delay_us(WAIT);

   value[2] = read_ADC();       //Wert für Kanal 3 per Poti einlesen

   set_adc_channel( 2 );

   delay_us(WAIT);

   value[1] = read_ADC();       //Wert für Kanal 3 per Poti einlesen

}

void init_dmx(void)

{

   set_uart_speed(250000, DMXX);      //Baudrate für Break bzw. Reset

   output_high(sn75176);       //RS458-Wandler auf Sendemodus versetzen; high: transmit low: receive

   status=1;                  //mit Break bzw. Reset beginnen

}

void main()

{

   enable_interrupts(GLOBAL);

   enable_interrupts(INT_TIMER2);

   setup_timer_2(T2_DIV_BY_16,195,16);    //10ms

   setup_adc_ports(AN0_AN1_AN3);

   setup_adc(ADC_CLOCK_INTERNAL);

  init_dmx();  

   value[0] = 0;

  value[1] = 0;

  value[2] = 0;

  value[3] = 0;

  value[4] = 0;

  value[5] = 0;

  value[6] = 0;

  value[7] = 0;

  value[8] = 0;

  value[9] = 0;

   while(1)

   {

       switch(status)

     {

         case 1:                //RESET (0 senden)

               set_uart_speed(4800, DMXX);   

               putc(0,DMXX);

               status = 2;

        break;

        case 2:         //1.Byte senden --> 1.Byte immer 0!

               delay_us(30);

               set_uart_speed(250000, DMXX); 

               putc(0,DMXX);

               status = 3;

               dmxnum = 1;

         break;

         case 3:        //DMX-Daten senden                     

               delay_us(10);

               putc(value[dmxnum],DMXX);    // Sende den aktuellen DMX Wert

               dmxnum++;

               If (dmxnum == DMXANZ)

               {

                  status = 1;

               }

         break;

     }

   }

}

ISR (USART_TXC_vect)

{

..Senderoutine..

}