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| Rev 153 | Rev 244 | ||
|---|---|---|---|
| 1 | #include "fifo.h" |
1 | #include "fifo.h" |
| 2 | 2 | ||
| 3 | u8 fifo_init (fifo_t *f, u8 *buffer, const u16 size) |
3 | u8 fifo_init (fifo_t* f, u8* buffer, const u16 size, u16 putvicsource, u16 getvicsource) |
| 4 | { |
4 | { |
| 5 | if(f == NULL) return(0); |
5 | if(f == NULL) return(0); |
| 6 | f->buffer = buffer; |
6 | f->buffer = buffer; |
| 7 | f->size = size; |
7 | f->size = size; |
| - | 8 | f->putvicsource = putvicsource; |
|
| - | 9 | f->getvicsource = getvicsource; |
|
| 8 | fifo_purge(f); |
10 | fifo_purge(f); |
| 9 | return(1); |
11 | return(1); |
| 10 | } |
12 | } |
| 11 | 13 | ||
| 12 | u8 fifo_put (fifo_t *f, const u8 data) |
14 | u8 fifo_put (fifo_t *f, const u8 data) |
| 13 | { |
15 | { |
| 14 | if (f->count >= f->size) return(0); // return 0 in case of FIFO overflow. |
16 | if (f->count >= f->size) return(0); // return 0 in case of FIFO overflow. |
| 15 | - | ||
| 16 | u8 * pwrite = f->pwrite; |
17 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, DISABLE); |
| 17 | - | ||
| 18 | *(pwrite++) = data; // copy data byte to buffer |
18 | *(f->pwrite++) = data; // copy data byte to buffer |
| 19 | if(pwrite >= f->buffer + f->size) pwrite = f->buffer; // start at the begining after reaching the end |
19 | if(f->pwrite >= f->buffer + f->size) f->pwrite = f->buffer; // start at the begining after reaching the end |
| 20 | f->pwrite = pwrite; |
- | |
| 21 | f->count++; |
20 | f->count++; |
| - | 21 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, ENABLE); |
|
| 22 | return 1; |
22 | return(1); |
| 23 | } |
23 | } |
| 24 | 24 | ||
| 25 | u8 fifo_get (fifo_t *f, u8 *pdata) |
25 | u8 fifo_get (fifo_t *f, u8 *pdata) |
| 26 | { |
26 | { |
| 27 | if((f == NULL) || (pdata == NULL)) return(0); |
- | |
| 28 | if(!f->count) return(0); |
27 | if(!f->count) return(0); |
| 29 | - | ||
| 30 | u8 *pread = f->pread; |
28 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, DISABLE); |
| 31 | *pdata = *(pread++); |
29 | *pdata = *(f->pread++); |
| 32 | if(pread >= f->buffer + f->size) pread = f->buffer; // start at the begining after reaching the end |
30 | if(f->pread >= f->buffer + f->size) f->pread = f->buffer; // start at the begining after reaching the end |
| 33 | f->pread = pread; |
- | |
| 34 | f->count--; |
31 | f->count--; |
| - | 32 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, ENABLE); |
|
| 35 | return(1); |
33 | return(1); |
| 36 | } |
34 | } |
| 37 | 35 | ||
| 38 | u8 fifo_get_wait (fifo_t *f, u8 *pdata) |
36 | u8 fifo_get_wait (fifo_t *f, u8 *pdata) |
| 39 | { |
37 | { |
| 40 | while (!f->count); |
38 | while (!f->count); |
| 41 | 39 | ||
| 42 | return fifo_get(f, pdata); |
40 | return fifo_get(f, pdata); |
| 43 | } |
41 | } |
| 44 | 42 | ||
| 45 | void fifo_purge(fifo_t* f) |
43 | void fifo_purge(fifo_t* f) |
| 46 | { |
44 | { |
| 47 | if((f == NULL)) return; |
45 | if((f == NULL)) return; |
| 48 | f->count = 0; |
46 | f->count = 0; |
| 49 | f->pread = f->buffer; |
47 | f->pread = f->buffer; |
| 50 | f->pwrite = f->buffer; |
48 | f->pwrite = f->buffer; |
| 51 | return; |
49 | return; |
| 52 | } |
50 | } |
| 53 | 51 | ||