0,0 → 1,53 |
#include "fifo.h" |
#include "main.h" |
#include "uart1.h" |
|
u8 fifo_init (fifo_t* f, u8* buffer, const u16 size, u16 putvicsource, u16 getvicsource) |
{ |
if(f == NULL) return(0); |
f->buffer = buffer; |
f->size = size; |
f->putvicsource = putvicsource; |
f->getvicsource = getvicsource; |
fifo_purge(f); |
return(1); |
} |
|
u8 fifo_put(fifo_t *f, const u8 data) |
{ |
if(f->buffer == 0) return(0); |
if (f->count >= f->size) return(0); // return 0 in case of FIFO overflow. |
if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, DISABLE); |
*(f->pwrite++) = data; // copy data byte to buffer |
if(f->pwrite >= f->buffer + f->size) f->pwrite = f->buffer; // start at the begining after reaching the end |
f->count++; |
if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, ENABLE); |
return(1); |
} |
|
u8 fifo_get (fifo_t *f, u8 *pdata) |
{ |
if(f->buffer == 0) return(0); |
if(!f->count) return(0); |
if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, DISABLE); |
*pdata = *(f->pread++); |
if(f->pread >= f->buffer + f->size) f->pread = f->buffer; // start at the begining after reaching the end |
f->count--; |
if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, ENABLE); |
return(1); |
} |
|
u8 fifo_get_wait (fifo_t *f, u8 *pdata) |
{ |
while (!f->count); |
return fifo_get(f, pdata); |
} |
|
void fifo_purge(fifo_t* f) |
{ |
if((f == NULL)) return; |
f->count = 0; |
f->pread = f->buffer; |
f->pwrite = f->buffer; |
return; |
} |