Rev 153 | Rev 272 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 41 | ingob | 1 | #include "fifo.h" |
| 2 | |||
| 244 | killagreg | 3 | u8 fifo_init (fifo_t* f, u8* buffer, const u16 size, u16 putvicsource, u16 getvicsource) |
| 41 | ingob | 4 | { |
| 5 | if(f == NULL) return(0); |
||
| 6 | f->buffer = buffer; |
||
| 153 | killagreg | 7 | f->size = size; |
| 244 | killagreg | 8 | f->putvicsource = putvicsource; |
| 9 | f->getvicsource = getvicsource; |
||
| 153 | killagreg | 10 | fifo_purge(f); |
| 41 | ingob | 11 | return(1); |
| 12 | } |
||
| 13 | |||
| 14 | u8 fifo_put (fifo_t *f, const u8 data) |
||
| 15 | { |
||
| 16 | if (f->count >= f->size) return(0); // return 0 in case of FIFO overflow. |
||
| 244 | killagreg | 17 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, DISABLE); |
| 18 | *(f->pwrite++) = data; // copy data byte to buffer |
||
| 19 | if(f->pwrite >= f->buffer + f->size) f->pwrite = f->buffer; // start at the begining after reaching the end |
||
| 41 | ingob | 20 | f->count++; |
| 244 | killagreg | 21 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, ENABLE); |
| 22 | return(1); |
||
| 41 | ingob | 23 | } |
| 24 | |||
| 25 | u8 fifo_get (fifo_t *f, u8 *pdata) |
||
| 26 | { |
||
| 27 | if(!f->count) return(0); |
||
| 244 | killagreg | 28 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, DISABLE); |
| 29 | *pdata = *(f->pread++); |
||
| 30 | if(f->pread >= f->buffer + f->size) f->pread = f->buffer; // start at the begining after reaching the end |
||
| 41 | ingob | 31 | f->count--; |
| 244 | killagreg | 32 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, ENABLE); |
| 41 | ingob | 33 | return(1); |
| 34 | } |
||
| 35 | |||
| 36 | u8 fifo_get_wait (fifo_t *f, u8 *pdata) |
||
| 37 | { |
||
| 38 | while (!f->count); |
||
| 39 | |||
| 40 | return fifo_get(f, pdata); |
||
| 41 | } |
||
| 153 | killagreg | 42 | |
| 43 | void fifo_purge(fifo_t* f) |
||
| 44 | { |
||
| 45 | if((f == NULL)) return; |
||
| 46 | f->count = 0; |
||
| 47 | f->pread = f->buffer; |
||
| 48 | f->pwrite = f->buffer; |
||
| 49 | return; |
||
| 50 | } |