]>
Commit | Line | Data |
---|---|---|
a16ba2b0 L |
1 | page 255\r |
2 | .z80\r | |
3 | \r | |
4 | global f.init,f.in,f.out,f.i.st\r | |
5 | \r | |
6 | extrn buf.init\r | |
7 | \r | |
8 | include config.inc\r | |
9 | include z180reg.inc\r | |
10 | \r | |
11 | \r | |
12 | ;--------------------------------------------------------------\r | |
13 | \r | |
14 | dseg\r | |
15 | \r | |
16 | \r | |
17 | mkbuf rx.buf,rx.buf_len\r | |
18 | mkbuf tx.buf,tx.buf_len\r | |
19 | \r | |
20 | \r | |
21 | ;--------------------------------------------------------------\r | |
22 | \r | |
23 | cseg\r | |
24 | ;\r | |
25 | ; FIFO channels for communication with stm32\r | |
26 | ;\r | |
27 | ; Init Serial I/O for console input and output\r | |
28 | ;\r | |
29 | \r | |
30 | f.init:\r | |
31 | ld ix,rx.buf\r | |
32 | ld a,rx.buf.mask\r | |
33 | call buf.init\r | |
34 | ld ix,tx.buf\r | |
35 | ld a,tx.buf.mask\r | |
36 | jp buf.init\r | |
37 | \r | |
38 | \r | |
39 | f.i.st:\r | |
40 | push ix\r | |
41 | ld ix,rx.buf ;\r | |
42 | \r | |
43 | buf.empty:\r | |
44 | ld a,(ix+o.in_idx) ;\r | |
45 | sub (ix+o.out_idx) ;\r | |
46 | pop ix\r | |
47 | ret z\r | |
48 | or 0ffh\r | |
49 | ret\r | |
50 | \r | |
51 | \r | |
52 | f.in:\r | |
53 | push ix\r | |
54 | ld ix,rx.buf ;\r | |
55 | \r | |
56 | buf.get:\r | |
57 | ld a,(ix+o.out_idx) ;\r | |
58 | bg.wait:\r | |
59 | cp (ix+o.in_idx) ;\r | |
60 | jr z,bg.wait\r | |
61 | \r | |
62 | push hl ;\r | |
63 | push ix\r | |
64 | pop hl\r | |
65 | add a,l\r | |
66 | ld l,a\r | |
67 | jr nc,bg.nc\r | |
68 | inc h\r | |
69 | bg.nc:\r | |
70 | ld l,(hl)\r | |
71 | \r | |
72 | ld a,(ix+o.out_idx) ;\r | |
73 | inc a\r | |
74 | and (ix+o.mask)\r | |
75 | ld (ix+o.out_idx),a\r | |
76 | \r | |
77 | ld a,l\r | |
78 | pop hl\r | |
79 | pop ix\r | |
80 | ret\r | |
81 | \r | |
82 | \r | |
83 | f.o.st:\r | |
84 | push ix\r | |
85 | ld ix,tx.buf ;\r | |
86 | \r | |
87 | buf.full:\r | |
88 | ld a,(ix+o.in_idx) ;\r | |
89 | inc a\r | |
90 | and (ix+o.mask)\r | |
91 | sub (ix+o.out_idx) ;\r | |
92 | pop ix\r | |
93 | ret z\r | |
94 | or 0ffh\r | |
95 | ret\r | |
96 | \r | |
97 | \r | |
98 | f.out:\r | |
99 | push ix\r | |
100 | ld ix,tx.buf ;\r | |
101 | \r | |
102 | buf.put:\r | |
103 | push hl ;\r | |
104 | push bc\r | |
105 | push ix\r | |
106 | pop hl\r | |
107 | ld c,(ix+o.in_idx) ;\r | |
108 | ld b,0\r | |
109 | add hl,bc\r | |
110 | ld b,a\r | |
111 | \r | |
112 | ld a,c ;\r | |
113 | inc a\r | |
114 | and (ix+o.mask)\r | |
115 | bp.wait:\r | |
116 | cp (ix+o.out_idx) ;\r | |
117 | jr z,bp.wait\r | |
118 | ld (hl),b\r | |
119 | ld (ix+o.in_idx),a\r | |
120 | \r | |
121 | ld a,b\r | |
122 | pop bc\r | |
123 | pop hl\r | |
124 | pop ix\r | |
125 | ret\r | |
126 | \r | |
127 | end\r | |
128 | \r |