projects / z180-stamp.git / blame
| Commit | Line | Data |
|---|---|---|
| 6a4e9540 L |
1 | page 255\r |
| 2 | .z80\r | |
| 3 | \r | |
| 4 | ;\r | |
| 5 | ; FIFO channels for communication with avr\r | |
| 6 | ;\r | |
| 30d1329e | 7 | global ff.init,ff.in,ff.out,ff.i.st,ff.o.st\r |
| 6a4e9540 L |
8 | \r |
| 9 | extrn buf.init\r | |
| 10 | \r | |
| 11 | include config.inc\r | |
| 12 | include z180reg.inc\r | |
| 13 | \r | |
| 14 | \r | |
| 15 | ;--------------------------------------------------------------\r | |
| 16 | \r | |
| 17 | dseg\r | |
| 18 | \r | |
| 19 | \r | |
| 20 | mkbuf co.fifo,co.fifo_len\r | |
| 21 | mkbuf ci.fifo,ci.fifo_len\r | |
| 22 | \r | |
| 23 | \r | |
| 24 | ;--------------------------------------------------------------\r | |
| 25 | \r | |
| 26 | cseg\r | |
| 27 | \r | |
| 28 | ; Init Serial I/O for console input and output\r | |
| 29 | ;\r | |
| 30 | \r | |
| 31 | ff.init:\r | |
| 32 | ld ix,ci.fifo\r | |
| 33 | ld a,ci.fifo.mask\r | |
| 34 | call buf.init\r | |
| 35 | ld ix,co.fifo\r | |
| 36 | ld a,co.fifo.mask\r | |
| 37 | jp buf.init\r | |
| 38 | \r | |
| 39 | \r | |
| 40 | ff.i.st:\r | |
| 41 | push ix\r | |
| 42 | ld ix,ci.fifo ;\r | |
| 43 | \r | |
| 44 | buf.empty:\r | |
| 45 | ld a,(ix+o.in_idx) ;\r | |
| 46 | sub (ix+o.out_idx) ;\r | |
| 47 | pop ix\r | |
| 48 | ret z\r | |
| 49 | or 0ffh\r | |
| 50 | ret\r | |
| 51 | \r | |
| 52 | \r | |
| 53 | ff.in:\r | |
| 54 | push ix\r | |
| 55 | ld ix,ci.fifo ;\r | |
| 56 | \r | |
| 57 | buf.get:\r | |
| 58 | ld a,(ix+o.out_idx) ;\r | |
| 59 | bg.wait:\r | |
| 60 | cp (ix+o.in_idx) ;\r | |
| 61 | jr z,bg.wait\r | |
| 62 | \r | |
| 63 | push hl ;\r | |
| 64 | push ix\r | |
| 65 | pop hl\r | |
| 66 | add a,l\r | |
| 67 | ld l,a\r | |
| 68 | jr nc,bg.nc\r | |
| 69 | inc h\r | |
| 70 | bg.nc:\r | |
| 71 | ld l,(hl)\r | |
| 72 | \r | |
| 73 | ld a,(ix+o.out_idx) ;\r | |
| 74 | inc a\r | |
| 75 | and (ix+o.mask)\r | |
| 76 | ld (ix+o.out_idx),a\r | |
| 77 | \r | |
| 78 | ld a,l\r | |
| 79 | pop hl\r | |
| 80 | pop ix\r | |
| 81 | ret\r | |
| 82 | \r | |
| 83 | \r | |
| 84 | ff.o.st:\r | |
| 85 | push ix\r | |
| 86 | ld ix,co.fifo ;\r | |
| 87 | \r | |
| 88 | buf.full:\r | |
| 89 | ld a,(ix+o.in_idx) ;\r | |
| 90 | inc a\r | |
| 91 | and (ix+o.mask)\r | |
| 92 | sub (ix+o.out_idx) ;\r | |
| 93 | pop ix\r | |
| 94 | ret z\r | |
| 95 | or 0ffh\r | |
| 96 | ret\r | |
| 97 | \r | |
| 98 | \r | |
| 99 | ff.out:\r | |
| 100 | push ix\r | |
| 101 | ld ix,co.fifo ;\r | |
| 102 | \r | |
| 103 | buf.put:\r | |
| 104 | push hl ;\r | |
| 105 | push bc\r | |
| 106 | push ix\r | |
| 107 | pop hl\r | |
| 30d1329e | 108 | ld a,c\r |
| 6a4e9540 L |
109 | ld c,(ix+o.in_idx) ;\r |
| 110 | ld b,0\r | |
| 111 | add hl,bc\r | |
| 112 | ld b,a\r | |
| 113 | \r | |
| 114 | ld a,c ;\r | |
| 115 | inc a\r | |
| 116 | and (ix+o.mask)\r | |
| 117 | bp.wait:\r | |
| 118 | cp (ix+o.out_idx) ;\r | |
| 119 | jr z,bp.wait\r | |
| 120 | ld (hl),b\r | |
| 121 | ld (ix+o.in_idx),a\r | |
| 122 | \r | |
| 123 | out (AVRINT6),a\r | |
| 124 | ld a,b\r | |
| 125 | pop bc\r | |
| 126 | pop hl\r | |
| 127 | pop ix\r | |
| 128 | ret\r | |
| 129 | \r | |
| 130 | end\r | |
| 131 | \r |