Code Conversion Help for S12XE

rayhall — Sun, 03 Jan 2016 06:45:33 GMT

I am converting code from Atmel AVR to use with the S12XE. The code relates to FAT library. I have most of it converted except for this function.

The problem is (void)*vi=&i; I do not understand what a (void)* is. I get errors like "Indirection applied to non-pointer" and "vi not declared". If I do declare it I still get errors.

Ray.

unsigned long int fat_getNextCluster(unsigned long int oneCluster){

unsigned long int i,j;

// FAT 16**************FAT 16

if(fat.fatType==16){

// i=oneCluster/256

i=oneCluster>>8;; // errechnet den sektor der fat in dem oneCluster ist (rundet immer ab)

// j=(oneCluster-256*i)*2 == 2*oneCluster-512*i

j=(oneCluster<<1)-(i<<9); // errechnet das low byte von oneCluster in dem ausgelesenen sektor der fat (high und low byte enthalten den folge cluster)

if(0==fat_loadSector(i+fat.fatSec)){ // neu laden nicht nÃ¶tig

i=0;

(void)*vi=&i; // zeiger auf i

bytesOfSec=&sector[j]; // zeiger auf puffer

*(unsigned char*)vi=*bytesOfSec; // setzen low byte von i, aus puffer

vi++; // zeigt auf nÃ¤chst hÃ¶heres byte in i

bytesOfSec++; // nÃ¤chst hÃ¶heres byte in puffer

*(unsigned char*)vi=*bytesOfSec; // setzen von hÃ¶herem byte in i, aus puffer

return i; // gibt neuen cluster zurÃ¼ck (oder 0xffff)

}

// FAT 32**************FAT 32

if(fat.fatType==32){

// i=oneCluster/128

i=oneCluster>>7; // errechnet den sektor der fat in dem oneCluster ist (rundet immer ab)

// j=(oneCluster-128*i)*4 == oneCluster*4-512*i

j=(oneCluster<<2)-(i<<9); // errechnet das low byte von oneCluster in dem ausgelesenen sektor der fat (high und low byte enthalten den folge cluster)

if(0==fat_loadSector(i+fat.fatSec)){ // neu laden nicht nÃ¶tig

void *vi=&i;

bytesOfSec=&sector[j];

*(unsigned char*)vi=*bytesOfSec;

vi++;

bytesOfSec++;

*(unsigned char*)vi=*bytesOfSec;

vi++;

bytesOfSec++;

*(unsigned char*)vi=*bytesOfSec;

vi++;

bytesOfSec++;

*(unsigned char*)vi=*bytesOfSec;

return i;

}

return(0); // neuladen des fat sektors, in dem oneCluster ist nÃ¶tig !!

}

Re: Code Conversion Help for S12XE

rayhall — Mon, 04 Jan 2016 08:28:36 GMT

I have solved the problem.

The complier did not like vi++;

I replaced it with vi = (char*)vi + 1;

Ray.

Re: Code Conversion Help for S12XE

RadekS — Mon, 04 Jan 2016 11:47:21 GMT

Hi Ray,

The void pointer, also known as the generic pointer, is a special type of pointer that can be pointed at objects of any data type.

For more details, please see for example:

http://stackoverflow.com/questions/4334831/what-is-a-void-pointer-and-what-is-a-null-pointer

http://stackoverflow.com/questions/8530080/what-is-a-void-pointer-in-c

I hope it helps you.

Have a great day,
RadekS

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