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uart communication

vimalmahanthy
#include "LPC17xx.h"                    // Device header
enum state_t{idle=0,AA,Cal_lnth,Evt_Data_clt,Cmd_Data_clt,Ack_Data_clt,cal_Check_sum};
enum events_t{aa=0x55,event=0x55,BB=0xbb,timeout,ack=0x33,cmd=0xcc,length};
uint16_t time_out=0;
uint8_t packet[32],Index=0,Event,ps;
struct State_Matrix
{
   enum state_t  Current_state;
   enum events_t Current_event;
   enum state_t     Next_state;
  
} 
 S_Matrix[]  = { {       idle   ,        aa,  AA            },
      {         AA   ,     event,  Evt_Data_clt  },
      {         AA   ,       cmd,  Cmd_Data_clt  },
      {         AA   ,       ack,  Ack_Data_clt  },
      {Evt_Data_clt  ,    length,  cal_Check_sum },
      {Ack_Data_clt  ,    length,  cal_Check_sum },
      {Cmd_Data_clt  ,    length,  cal_Check_sum },
      {          AA  ,    timeout,     idle      },
      {Cal_lnth      ,    timeout,     idle      },
      {Evt_Data_clt  ,    timeout,     idle      },
      {Ack_Data_clt  ,    timeout,     idle      },
      {Cmd_Data_clt  ,    timeout,     idle      },
 
enum events_t f1(); 
enum events_t f2();
enum events_t f3();
enum events_t f4();
enum events_t f5();
enum events_t f6();
      
struct State_function
 
{
 char name[20];
 enum events_t (*func)();
};
Function[]  = {      {"    idle     ",       &f1 },
      {"     AA      ",       &f2 },
      {"Cal_lnth     ",       &f3 },
      {"Evt_Data_clt ",       &f4 },
      {"Cmd_Data_clt ",       &f5 },
      {"Ack_Data_clt ",       &f6 },
 
    };
        
void f1(uint8_t i,uint8_t a[])
{
 while(packet[i]!=aa)
 i++;
 ps = AA; 
}
void  f2(uint8_t i,uint8_t *ptr)
{
 LPC_TIM0->TCR = 1;
 if(packet[i] == 0x55)
 *ptr = Evt_Data_clt;
 else if(packet[i] == 0x33)
 *ptr = Ack_Data_clt;
 else if(packet[i] == 0x55)
 *ptr = Cmd_Data_clt
 else
  ;
}
void  f3()
{
 LPC_TIM0->TCR = 1;
 
}
enum events_t f4()
{
 LPC_TIM0->TCR = 1;
 if(length>16)
 ps = cal_Check_sum;
}
enum events_t f5()
{
 LPC_TIM0->TCR = 1;
 if(length>14)
 ps = cal_Check_sum;
}
enum events_t f6()
{
 LPC_TIM0->TCR = 1;
 if(length>16)
 ps = cal_Check_sum;
}
     

 
int UART0_IRQHandler()
{
 LPC_TIM0->TCR = 0;
 packet[Index] = LPC_UART0->RBR;
 if(Index==0)
 Function[Index+1].func(Index,packet); 
 
}
void TIMER0_IRQHandler()
{
 LPC_TIM0->TCR = 2;//TIMER0_IRQHandler,precounter are reset
  Event  = timeout;
  ps  = idle;
}
int main()
{
 LPC_GPIO3->FIODIR3 = 0xff;
 LPC_GPIO3->FIOPIN3 = 0x00;
 LPC_SC->PCONP  = (1<<3|3<<1);//poweron uart0 in pconp register at bit3 and timer0
 LPC_SC->PCLKSEL0  = 0<<6;//peripheral clock select for uart0 in pclksel0 registers 6-7 bits
 LPC_UART0->LCR  = 1<<7;//divisor latch enabled in lcr register
 LPC_UART0->DLL  = 0xa1;//register contains lsb of divisor
 LPC_UART0->DLM  = 0x00;//register contains msb of divisor
 LPC_UART0->FCR  = 1;//enable fifo in fcr
 LPC_PINCON->PINSEL0 = (1<<4)|(1<<6);//ENABLED UART0 TX & RX OF GPIO
 LPC_UART0->LCR  = 0<<7;//dlab=0
 LPC_UART0->LCR  = 3|(0<<2)|(0<<3);
 LPC_GPIO3->FIODIR3 = 0xff;
 LPC_GPIO3->FIOPIN3 = 0x00;
 LPC_UART0->IER  = 1;
 NVIC->ISER[0]  = 1<<5;
 LPC_SC->PCLKSEL0  = 0<<2;//peripherical=cclk is selected for timer0
 LPC_TIM0->PR  = 0;//precount register set to zero
 LPC_TIM0->MR0  = 0xa2c3;
 LPC_TIM0->MCR  = 3;
 
 while(1)
 {
  
 }
} 
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