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| 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); |
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| 6 | f->buffer = buffer; |
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| 153 | killagreg | 7 | f->size = size; |
| 244 | killagreg | 8 | f->putvicsource = putvicsource; |
| 9 | f->getvicsource = getvicsource; |
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| 153 | killagreg | 10 | fifo_purge(f); |
| 41 | ingob | 11 | return(1); |
| 12 | } |
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| 13 | |||
| 14 | u8 fifo_put (fifo_t *f, const u8 data) |
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| 15 | { |
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| 272 | killagreg | 16 | if(f->buffer == 0) return(0); |
| 41 | ingob | 17 | if (f->count >= f->size) return(0); // return 0 in case of FIFO overflow. |
| 244 | killagreg | 18 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, DISABLE); |
| 19 | *(f->pwrite++) = data; // copy data byte to buffer |
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| 20 | if(f->pwrite >= f->buffer + f->size) f->pwrite = f->buffer; // start at the begining after reaching the end |
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| 41 | ingob | 21 | f->count++; |
| 244 | killagreg | 22 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, ENABLE); |
| 23 | return(1); |
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| 41 | ingob | 24 | } |
| 25 | |||
| 26 | u8 fifo_get (fifo_t *f, u8 *pdata) |
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| 27 | { |
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| 272 | killagreg | 28 | if(f->buffer == 0) return(0); |
| 41 | ingob | 29 | if(!f->count) return(0); |
| 244 | killagreg | 30 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, DISABLE); |
| 31 | *pdata = *(f->pread++); |
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| 32 | if(f->pread >= f->buffer + f->size) f->pread = f->buffer; // start at the begining after reaching the end |
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| 41 | ingob | 33 | f->count--; |
| 244 | killagreg | 34 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, ENABLE); |
| 41 | ingob | 35 | return(1); |
| 36 | } |
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| 37 | |||
| 38 | u8 fifo_get_wait (fifo_t *f, u8 *pdata) |
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| 39 | { |
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| 40 | while (!f->count); |
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| 41 | |||
| 42 | return fifo_get(f, pdata); |
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| 43 | } |
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| 153 | killagreg | 44 | |
| 45 | void fifo_purge(fifo_t* f) |
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| 46 | { |
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| 47 | if((f == NULL)) return; |
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| 48 | f->count = 0; |
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| 49 | f->pread = f->buffer; |
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| 50 | f->pwrite = f->buffer; |
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| 51 | return; |
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| 52 | } |