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1 | #include "fifo.h" |
1 | #include "fifo.h" |
2 | #include "main.h" |
2 | #include "main.h" |
3 | #include "uart1.h" |
3 | #include "uart1.h" |
4 | 4 | ||
5 | u8 fifo_init (fifo_t* f, u8* buffer, const u16 size, u16 putvicsource, u16 getvicsource) |
5 | u8 fifo_init (fifo_t* f, u8* buffer, const u16 size, u16 putvicsource, u16 getvicsource) |
6 | { |
6 | { |
7 | if(f == NULL) return(0); |
7 | if(f == NULL) return(0); |
8 | f->buffer = buffer; |
8 | f->buffer = buffer; |
9 | f->size = size; |
9 | f->size = size; |
10 | f->putvicsource = putvicsource; |
10 | f->putvicsource = putvicsource; |
11 | f->getvicsource = getvicsource; |
11 | f->getvicsource = getvicsource; |
12 | fifo_purge(f); |
12 | fifo_purge(f); |
13 | return(1); |
13 | return(1); |
14 | } |
14 | } |
15 | 15 | ||
16 | u8 fifo_put (fifo_t *f, const u8 data) |
16 | u8 fifo_put(fifo_t *f, const u8 data) |
17 | { |
17 | { |
18 | if(f->buffer == 0) return(0); |
18 | if(f->buffer == 0) return(0); |
19 | if (f->count >= f->size) return(0); // return 0 in case of FIFO overflow. |
19 | if (f->count >= f->size) return(0); // return 0 in case of FIFO overflow. |
20 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, DISABLE); |
20 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, DISABLE); |
21 | *(f->pwrite++) = data; // copy data byte to buffer |
21 | *(f->pwrite++) = data; // copy data byte to buffer |
22 | if(f->pwrite >= f->buffer + f->size) f->pwrite = f->buffer; // start at the begining after reaching the end |
22 | if(f->pwrite >= f->buffer + f->size) f->pwrite = f->buffer; // start at the begining after reaching the end |
23 | f->count++; |
23 | f->count++; |
24 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, ENABLE); |
24 | if(f->putvicsource != NO_ITLine) VIC_ITCmd(f->putvicsource, ENABLE); |
25 | return(1); |
25 | return(1); |
26 | } |
26 | } |
27 | 27 | ||
28 | u8 fifo_get (fifo_t *f, u8 *pdata) |
28 | u8 fifo_get (fifo_t *f, u8 *pdata) |
29 | { |
29 | { |
30 | if(f->buffer == 0) return(0); |
30 | if(f->buffer == 0) return(0); |
31 | if(!f->count) return(0); |
31 | if(!f->count) return(0); |
32 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, DISABLE); |
32 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, DISABLE); |
33 | *pdata = *(f->pread++); |
33 | *pdata = *(f->pread++); |
34 | if(f->pread >= f->buffer + f->size) f->pread = f->buffer; // start at the begining after reaching the end |
34 | if(f->pread >= f->buffer + f->size) f->pread = f->buffer; // start at the begining after reaching the end |
35 | f->count--; |
35 | f->count--; |
36 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, ENABLE); |
36 | if(f->getvicsource != NO_ITLine) VIC_ITCmd(f->getvicsource, ENABLE); |
37 | return(1); |
37 | return(1); |
38 | } |
38 | } |
39 | 39 | ||
40 | u8 fifo_get_wait (fifo_t *f, u8 *pdata) |
40 | u8 fifo_get_wait (fifo_t *f, u8 *pdata) |
41 | { |
41 | { |
42 | while (!f->count); |
42 | while (!f->count); |
43 | return fifo_get(f, pdata); |
43 | return fifo_get(f, pdata); |
44 | } |
44 | } |
45 | 45 | ||
46 | void fifo_purge(fifo_t* f) |
46 | void fifo_purge(fifo_t* f) |
47 | { |
47 | { |
48 | if((f == NULL)) return; |
48 | if((f == NULL)) return; |
49 | f->count = 0; |
49 | f->count = 0; |
50 | f->pread = f->buffer; |
50 | f->pread = f->buffer; |
51 | f->pwrite = f->buffer; |
51 | f->pwrite = f->buffer; |
52 | return; |
52 | return; |
53 | } |
53 | } |
54 | 54 |