#include    "p24FJ128GA306.h"

//   uvozovky znamenaji aktualni adresar, <> adresar tam nekde - proste ten jeho 
//   my ted  stdio ani string k nicemu nepotrebujeme, takze tady neni   


//  zatim tady nejsou zadne fuses, takze vsechno je default
//  zejmena :  FRC oscilator, Watchdog enabled - !!!!! Musi se vypnout v UP 




_CONFIG4(0x00FFFF )
_CONFIG3(0x00FFFF )
_CONFIG2(0x0098FF )
_CONFIG1(0x003F7F )




void main (void) {

 int i;

 
 typedef unsigned char BYTE;
 typedef unsigned int WORD;
 typedef unsigned long DWORD;

 i = 10;
 
 ODCB = 0;
 ODCC = 0;
 ODCD = 0;
 ODCE = 0;
 ODCF = 0;
 ODCG = 0;
  /*  ona je tam defaultne 0, takze je to trochu nadbytecne 
  porty NEBUDOU se otevrenym kolektorem   */

 
 PORTB = 0; 
 PORTC = 0;
 PORTD = 0;
 PORTE = 0;
 PORTF = 0;
 PORTG = 0;
  /*  az dame nektery pin vystupni, aby bylo jasne, jaka hodnota tam bude    */


 ANSB = 0x0004;   /*  0000 0000 0000 0100  */ 
   /*  vstup pro prevodnik je analogovy  */

 TRISB = 0x72F5;
  /*    xxxx 0010 1111 0101 - viz file porty.xls , d8le i pro ostatn9 tris 
        RB15 chceme vzstupni - bude tam to PWM !!!!!! 
           */
 TRISC = 0xFFFF;   /*  tento port je nepouzitelny  - krystaly */
 TRISD =  0xFF0F;
    /*  1111 xxxx 0000 111x   
     piny 15 - 12 tam nejsou, ale do registru neco zapsat musime
     a bity 3 -1 jsou zatim s otaznikem, ale nastavenim jako vstup nic nezkayime */
 TRISE = 0xF0;   /*  odvodte si zami  */
 
 TRISF = 0xF4;   /* 1111 0100   RF3 vystupni pro PWM  */
 
 TRISG = 0xFF7F;

 CNPU5 = 0x0001;
 CNPU4 = 0xC000;
  /* Pull-Up rezistory, ale fakt netusim jestli to pujde   */







 /* PWM chceme mit na pinu   GPIO_10
    RP16	pin 33	 portF RF3

    RPOR8 , dolnich 6 bitu
  
    viz porty.xls  
    a pouziji pro to prvni Output compare  - OC1 
    output function number je 18 - viz TABLE 11-4: SELECTABLE OUTPUT SOURCES
    RP16 je v registru  RPOR8, tam je také RP17 - na tom nebude nic
    RPOR8 = 0000 0000  xx01 0010    */




// Unlock Registers

asm volatile  (  " MOV #OSCCON, w1 \n"
    "MOV #0x46, w2  \n"
	"MOV #0x57, w3  \n"
	"MOV.b w2, [w1] \n"
	"MOV.b w3, [w1] \n"
	"BCLR OSCCON, #6 "   ) ;

/* vlastni nastaveni Peripheral pin select   */  

RPOR8 = 0x0012 ; 


// Lock Registers

asm volatile (  " MOV #OSCCON, w1 \n"
	"MOV #0x46, w2  \n"
	"MOV #0x57, w3  \n"
	"MOV.b w2, [w1] \n"
	"MOV.b w3, [w1] \n"
	"BSET OSCCON, #6 "    );






/*  T2CON
    1xxx xxxx x000 0x0x 
    poustime cicat TMR2   */

 PR2 = 400;     /* a tohle je perioda pro PWM  */ 
 T2CON = 0x8000;

 OC1CON1 = 0;
 OC1CON2 = 0;
 OC1RS = 350;   /* konec duty cycle 
                   neco mezi OCR1 a PR2    */
 OC1R  =  10;   /* zacatek  duty cycle 
                  neco mezi 0 a PR2
                  hodnotu 0 to snese   */


/*   
Select TMR2 as the synchronization
source by writing 0x0c to the SYNCSEL<4:0>
bits (OCxCON2<4:0>) 
and ‘0’ to the OCTRIG bit (OCxCON2<7>).
 - OCTRIG rika, ze to chceme synchronizovat, ne trigged

OC1CON2   bbbb bbbb 0bb0 1100  pro Timer2 

cosi s FAULT conditions , a nechci invertovat
 0000 bbbb 0bb0 1100
- FAULT bity umozni hardwarově zrusit pulz PWM 

PWM Duty Cycle Least Significant bits  a OC32
  0000 0000 0bb0 1100
  
bitum 6 a 5 nerozumim
  0000 0000 0000 1100

     bit7 - OCTRIG - je to synchronized 
        6   TRIGSTAT 
        4 - 0  SYNCSEL  - zdroj synchonizace - TMR2 
 */


OC1CON2  = 0x000C; 


// OC1CON2  = 0x0000;


/*  OC1CON1
Select a clock source by writing to the
OCTSEL<2:0> bits (OCxCON<12:10>).
  xx00 00bb bbbb bbbb 
      000 = TMR2 clock 


Appropriate Fault inputs may be enabled by
using the ENFLT<2:0> bits as described in
Register 15-1.
  xx00 0000 0bbb bbbb 
     bity 9 - 7 , FAULT disabled  


    xx00 0000 0000 0bbb 
 tohle je cosi s TRIGSTAT , bit 3
 bity 4 - 6 jsou  PWM Fault 2 (Comparator 1/2/3) Condition Status bit
 asi by se tady dalo poznat, co tomu je, ale FAULT mame disabled   

TRIGSTAT: Timer Trigger Status bit
1 = Timer source has been triggered and is running
0 = Timer source has not been triggered and is being held clear
takye nastavit do 1 ??????


          */

   OC1CON1 = 0;    /*  zdroj hodin je TMR2   */ 

/*  
 a uplne na konci navod rika 
   Select the desired PWM mode with the
   OCM<2:0> bits (OCxCON1<2:0>).
*/



OC1CON1bits.OCM = 7; /* This selects the centre  Aligned PWM mode*/


IEC0 =  0;
 /*  povoluji preruseni  od TMR2 a OC1  */
 IEC0bits.T2IE = 1;
 IEC0bits.OC1IE = 1;


 while(1) {
 
 /* 

 tohle je residuum z jineho proghramu, muze tu byt cokoli 
 

 tady budeme kopirovat stav tlacitek na LED 
 syntaxe pro jeden bit portu:  PORTBbits.RB5  a podobne
 najdeme to v header file, zhruba od radku 8065
 lze pouyit  synaxi   PORTBbits.RB5
 i _RB5 - podivejte se na to do p24FJ128GA306.h  
 LEd jsou na porteg RD4, RD5, RD6, RD7 
 tlacitka na pinech 
 RE4 RE5 RE6 

 
   */
 
 PORTDbits.RD4   =  PORTEbits.RE4 ;
 PORTDbits.RD5   =  _RE5 ;
 _RD6            =  PORTEbits.RE6 ;
 _RD7            =  _RE4 ; 
 

}   /*  od while   */


}
// zaviraci zavorka od main



void __attribute__((interrupt)) _T2Interrupt(void)  {
   
      IFS0bits.T2IF = 0;   
       /*  shazujeme pozadavkovy bit
         dejte si sem breakpoint a podivejte se, jak dlouho trva perioda
           */
   
}  /* zaviraci od podprogramu _T2Interrupt
    retfie prida prekladac sam, je to dano atributem interrupt */



void __attribute__((interrupt)) _OC1Interrupt(void)  {
   
      IFS0bits.OC1IF = 0;   
       /*  shazujeme pozadavkovy bit
         dejte si sem breakpoint a podivejte se, jak dlouho trva perioda
           */
   
}  /* zaviraci od interuptu
      pro spravnou syntaxi 
      _OC1Interrupt a dalsich se podivejte do *.gld file 

 !!!!!!!!!!! povolovaci a pozadavkovy registr pro jiny modul
 Output Compare - OC2, OC3, ..... NEBUDE IFS0 ,  IEC0 ,
   najdete si to v datasheetu !!!!!!!!! 
 
  */