| 0,0 → 1,52 |
|---|
| #include "fifo.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; |
| } |