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Rev | Author | Line No. | Line |
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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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16 | if (f->count >= f->size) return(0); // return 0 in case of FIFO overflow. |
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244 | killagreg | 17 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, DISABLE); |
18 | *(f->pwrite++) = data; // copy data byte to buffer |
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19 | 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 | 20 | f->count++; |
244 | killagreg | 21 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, ENABLE); |
22 | return(1); |
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41 | ingob | 23 | } |
24 | |||
25 | u8 fifo_get (fifo_t *f, u8 *pdata) |
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26 | { |
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27 | if(!f->count) return(0); |
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244 | killagreg | 28 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, DISABLE); |
29 | *pdata = *(f->pread++); |
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30 | 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 | 31 | f->count--; |
244 | killagreg | 32 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, ENABLE); |
41 | ingob | 33 | return(1); |
34 | } |
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35 | |||
36 | u8 fifo_get_wait (fifo_t *f, u8 *pdata) |
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37 | { |
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38 | while (!f->count); |
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39 | |||
40 | return fifo_get(f, pdata); |
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41 | } |
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153 | killagreg | 42 | |
43 | void fifo_purge(fifo_t* f) |
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44 | { |
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45 | if((f == NULL)) return; |
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46 | f->count = 0; |
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47 | f->pread = f->buffer; |
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48 | f->pwrite = f->buffer; |
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49 | return; |
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50 | } |