avr-libc, Bootloader, CodeVision

register unsigned int    CurrentAdress       @0x0006; //CurrentAdress in Register 6 speichern

void DO_SPM(void)

{

     #asm

     WAIT_SPM:

          in   r16,0x37;           //SPMCR in Register r16 einlesen   37= Address von SPMCR, passt für ATmega32 

          sbrc r16,0x01;           //Skip if Bit in Register is Cleared

          rjmp WAIT_SPM;

          out  0x37,r17;           //schreibe in SPMCR-Register und führe aus

          spm;

     #endasm

} 

void PAGE_ERASE(unsigned int adress)

{

     CurrentAdress = adress;  

     //Löscht Page die in PAGE-Adresse des Z-Pointer(Z6...Z12) steht 

     #asm   

          movw r30,r6; //move  CurrentAddress to Z pointer  

          ldi  r17,0x03; //Bit 0 – SPMEN: Store Program Memory Enable, Bit 1 – PGERS: Page Erase 

     #endasm     

     DO_SPM();

}

//Aufruf im Hauptprogramm

   PAGE_ERASE(0x00);

unsigned char PAGESIZE    = 64; 

unsigned char PAGE_BUFFER[PAGESIZE*2]    @0x008A;

     PAGE_BUFFER[0]=0x0C; 

     PAGE_BUFFER[1]=0x94;

     PAGE_BUFFER[2]=0x68;

     PAGE_BUFFER[3]=0x0C;

     PAGE_BUFFER[4]=0x94;

     PAGE_BUFFER[5]=0x00;

     PAGE_BUFFER[6]=0x00;

     //usw.

void REENABLE_RWW(void);

void DO_SPM(void);

void PAGE_ERASE(unsigned int);

void READ_COM_2_PUFFER(void);

void RAM_2_TEMP_PAGE(void);

void PAGE_WRITE(void);

#pragma regalloc-        /* Deaktivierung der automatischen Vergabe von Adressen an Variablen*/

register unsigned int    daten                      @0x0002;

register unsigned int    CurrentAdress              @0x0006; //CurrentAdress in Register 6 speichern

unsigned int             j                          @0x0068;

unsigned char            PAGE_BUFFER[128]           @0x008A;

#pragma regalloc+        /* Aktivierung der automatischen Vergabe von Adressen an Variablen*/

void DO_SPM(void)

{

     #asm

     WAIT_SPM:

          in   r16,0x37;            //SPMCR in Register r16 einlesen   37= Address von SPMCR, passt für ATmega32 

          sbrc r16,0x01;            //Skip if Bit in Register is Cleared 

                                    //The SPMEN bit will auto-clear upon completion of an SPM instruction,

                                    //or if no SPM instruction is executed within four clock cycles. During page erase and page write,

                                    //the SPMEN bit remains high until the operation is completed.

          rjmp WAIT_SPM;

          out  0x37,r17;           //schreibe in SPMCR-Register und führe aus

          spm;

     #endasm

} 

void PAGE_ERASE(unsigned int adress)

{

     CurrentAdress = adress;  

     //Löscht Page die in PAGE-Adresse des Z-Pointer(Z6...Z12) steht 

     #asm   

          movw r30,r6; //move  CurrentAddress to Z pointer  

          ldi  r17,0x03; //Bit 0 – SPMEN: Store Program Memory Enable, Bit 1 – PGERS: Page Erase 

     #endasm     

     DO_SPM();

}

void REENABLE_RWW(void)

{

     #asm("ldi r17,0x11");    //Bit 0 – SPMEN: Store Program Memory Enable, Bit 4 – RWWSRE: Read-While-Write Section Read Enable

     DO_SPM();

}

void READ_COM_2_PUFFER(void)

{

     //Bereit zum Empfangen

     printf("\n\rDaten werden empfangen");

     //for(j=0;j<(PAGESIZE*2);j++)

     //{

     //   PAGE_BUFFER[j]=getchar();

     //}    

     PAGE_BUFFER[0]=0x0C; 

     PAGE_BUFFER[1]=0x94;

     PAGE_BUFFER[2]=0x68;

     PAGE_BUFFER[3]=0x00; //zeile1

     PAGE_BUFFER[4]=0x0C;

     ...

     PAGE_BUFFER[127]=0x6F;

}

void RAM_2_TEMP_PAGE(void)

{

     for(j=0;j<128;j++)

     {    

          daten=PAGE_BUFFER[j]+256*PAGE_BUFFER[j+1];   //schreibt wort in registerpar r3+r2      

          #asm("movw  r0,r2");                         //kopiert wert r3+r2 in r1+r0

          #asm("ldi r17,0x01");                        //If only SPMEN is written, the following SPM instruction will store the value in R1:R0 in the temporary page buffer addressed by the Z-pointer.

          DO_SPM();

          #asm("adiw r31:r30,2");                      //Addiert +2 in Z-Register-> Pageadresse

     }  

} 

void PAGE_WRITE(void)

{

     #asm

          movw r30,r6;   //move  CurrentAddress to Z pointer  

          ldi r17,0x05;  //Bit 0 – SPMEN: Store Program Memory Enable, Bit 2 – PGWRT: Page Write

     #endasm

     DO_SPM();

}

void main(void)

{

do

      {

        if(rx_counter>=1)  

        {

            c = getchar();  

            switch((unsigned char)c)

            {

                 case 'q': 

                flag=0;

                    printf("\n\rVerlasse den Bootloader!");

                    break; 

                  case 'l':  

                    printf("\n\rLösche Page 0x0004");                      

                    //Page löschen  

                    PAGE_ERASE(0x0); 

                    //Reaktivierung des RWW-Bereichs

                    REENABLE_RWW();     

                    break;

                  case 'w':                

                    //Daten aus serielle Schnittstelle lesen und in Array speichern

                    READ_COM_2_PUFFER();

                    //Von Array in temporären Pagespeicher speichern       

                    RAM_2_TEMP_PAGE();

                    //Page schreiben

                    PAGE_WRITE();                  

                    //Reaktivierung des RWW-Bereichs

                    REENABLE_RWW();

                    break;

                 default:

                    printf("\n\rDu hast folgendes Zeichen gesendet: ");

                    printf("%c",c);         

                    break;

            }

        }

}

void RAM_2_TEMP_PAGE(void)

{     

     for(j=0;j<128;j+=2)

     {    

          daten=PAGE_BUFFER[j]+256*PAGE_BUFFER[j+1];   //schreibt wort in registerpar r3+r2      

          #asm("movw  r0,r2");                         //kopiert wert r3+r2 in r1+r0

          #asm("ldi r17,0x01");                        //If only SPMEN is written, the following SPM instruction will store the value in R1:R0 in the temporary page buffer addressed by the Z-pointer.

          DO_SPM();                                    //The LSB of the Z-pointer is ignored.

          #asm("adiw r31:r30,2");                      //Addiert +2 in Z-Register-> Pageadresse

     }  

}