//---------------------------------------------------------------------
// RS232.c
// 9/24/07
// Converts from USB to RS232.  One USB input to three RS232 outputs.
// 11/9/07
// Add capability to receive replies from devices.  If no reply received 
// after sending USB command, it will return the string "No Reply"
//
// lt222@cornell.edu
//---------------------------------------------------------------------

#include <18F4455.h>
#include <stdio.h>
#include <stdlib.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN, MCLR
#use delay(clock=48000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, stream=,bits=8)

/////////////////////////////////////////////////////////////////////////////
//In usb.c/h - tells the CCS PIC USB firmware to include HID handling code.
#DEFINE USB_HID_DEVICE  TRUE

//the following defines needed for the CCS USB PIC driver to enable the TX endpoint 1
// and allocate buffer space on the peripheral
#define USB_EP1_TX_ENABLE  USB_ENABLE_INTERRUPT   //turn on EP1 for IN bulk/interrupt transfers
#define USB_EP1_TX_SIZE    25  //allocate 25 bytes in the hardware for transmission   

//the following defines needed for the CCS USB PIC driver to enable the RX endpoint 1
// and allocate buffer space on the peripheral
#define USB_EP1_RX_ENABLE  USB_ENABLE_INTERRUPT   //turn on EP1 for OUT bulk/interrupt transfers
#define USB_EP1_RX_SIZE    25  //allocate 25 bytes in the hardware for reception   

#include <pic18_usb.h>      //Microchip 18Fxx5x hardware layer for usb.c
#include <USB_to_RS232_desc_25.h>   //USB Configuration and Device descriptors for this USB device
#include <usb.c>            //handles usb setup tokens and get descriptor reports

// Messages - USB interface
#define PRINTSTR     0x04


//Global Variables
char command[26];
char *reply;
char *p;



/////////// Initialization code /////////////////////////////
//
// Sets ports as inputs or outputs and to the correct state
//  Note in set tris - 1 means input, 0 means output

void SystemInit(void)
{
    setup_adc(ADC_CLOCK_INTERNAL);
    setup_psp(PSP_DISABLED);
    setup_spi(FALSE);
    setup_wdt(WDT_OFF);
    setup_timer_0(RTCC_INTERNAL);
    setup_timer_1(T1_DISABLED);
    setup_timer_2(T2_DISABLED,0,1);
    setup_comparator(NC_NC_NC_NC);
    setup_vref(FALSE);
    setup_oscillator(False);
    SET_TRIS_A(0b10001010);  // Port A = analog data in from PMT ID signal 
    SET_TRIS_B(0b00000000);  // Port B = all outputs
    SET_TRIS_C(0b11000000);  // Port C =
    SET_TRIS_D(0b00000000);  // Port D = all outputs 
    SET_TRIS_E(0b00001000);  // Port E = all outputs except for reset
   

}

void out1(void)
{  #use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, stream=,bits=8)
   printf("\n\r %s ", (p+1));
}

void out2(void)
{  #use rs232(baud=9600, xmit=PIN_A0, rcv=PIN_A1, stream=,bits=8)
   printf("\n\r %s ", (p+1));
}
   
void out3(void)
{  #use rs232(baud=9600, xmit=PIN_A2, rcv=PIN_A3, stream=,bits=8)
   printf("\n\r %s ", (p+1));
} 

void main(void) {

   usb_init();
   SystemInit();
   p=command; 
  
   
   while (TRUE) {
     if (usb_enumerated()) {         
          if (usb_kbhit(1)) { 
              usb_gets(1, command, 25, 100);
                  switch (command[0]){
                     case 0x31: 
                        out1();
                        break;
                     case 0x32:
                        out2();
                        break;
                     case 0x33:
                        out3();
                        break;
                  }

               if (kbhit()){
                  gets(reply);
               }
               else {
                  reply = "No Reply";
               }
                     

               usb_puts(1, reply, 25, 100);
              
          }
      }
      
   }  
}