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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 41 | ingob | 1 | #include "fifo.h" |
| 362 | holgerb | 2 | #include "main.h" |
| 41 | ingob | 3 | |
| 244 | killagreg | 4 | u8 fifo_init (fifo_t* f, u8* buffer, const u16 size, u16 putvicsource, u16 getvicsource) |
| 41 | ingob | 5 | { |
| 6 | if(f == NULL) return(0); |
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| 7 | f->buffer = buffer; |
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| 153 | killagreg | 8 | f->size = size; |
| 244 | killagreg | 9 | f->putvicsource = putvicsource; |
| 10 | f->getvicsource = getvicsource; |
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| 153 | killagreg | 11 | fifo_purge(f); |
| 41 | ingob | 12 | return(1); |
| 13 | } |
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| 14 | |||
| 15 | u8 fifo_put (fifo_t *f, const u8 data) |
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| 16 | { |
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| 272 | killagreg | 17 | if(f->buffer == 0) return(0); |
| 41 | ingob | 18 | if (f->count >= f->size) return(0); // return 0 in case of FIFO overflow. |
| 244 | killagreg | 19 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, DISABLE); |
| 20 | *(f->pwrite++) = data; // copy data byte to buffer |
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| 21 | 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 | 22 | f->count++; |
| 244 | killagreg | 23 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, ENABLE); |
| 24 | return(1); |
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| 41 | ingob | 25 | } |
| 26 | |||
| 27 | u8 fifo_get (fifo_t *f, u8 *pdata) |
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| 28 | { |
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| 272 | killagreg | 29 | if(f->buffer == 0) return(0); |
| 41 | ingob | 30 | if(!f->count) return(0); |
| 244 | killagreg | 31 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, DISABLE); |
| 32 | *pdata = *(f->pread++); |
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| 33 | 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 | 34 | f->count--; |
| 244 | killagreg | 35 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, ENABLE); |
| 41 | ingob | 36 | return(1); |
| 37 | } |
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| 38 | |||
| 39 | u8 fifo_get_wait (fifo_t *f, u8 *pdata) |
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| 40 | { |
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| 362 | holgerb | 41 | while (!f->count && (SD_WatchDog)); |
| 41 | ingob | 42 | |
| 43 | return fifo_get(f, pdata); |
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| 44 | } |
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| 153 | killagreg | 45 | |
| 46 | void fifo_purge(fifo_t* f) |
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| 47 | { |
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| 48 | if((f == NULL)) return; |
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| 49 | f->count = 0; |
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| 50 | f->pread = f->buffer; |
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| 51 | f->pwrite = f->buffer; |
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| 52 | return; |
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| 53 | } |