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Commit | Line | Data |
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1 | ||
2 | public intinit | |
3 | public bufinit | |
4 | public cpu_frq | |
5 | public get_tmr | |
6 | ||
7 | public fifolst | |
8 | ||
9 | extrn div32_r,?pmsg | |
10 | extrn msg.sm,msg.recv,hwl2phy | |
11 | ||
12 | include config.inc | |
13 | include z180reg.inc | |
14 | ||
15 | ||
16 | ;---------------------------------------------------------------------- | |
17 | ||
18 | dseg | |
19 | ||
20 | intinit: | |
21 | ld hl,ivtab ; | |
22 | ld a,h ; | |
23 | ld i,a ; | |
24 | out0 (il),l ; | |
25 | im 2 | |
26 | ||
27 | ; Let all vectors point to spurious int routines. | |
28 | ||
29 | ld de,sp.int0 | |
30 | ld bc,sp.int.len | |
31 | ld a,9 | |
32 | ivt_i1: | |
33 | ld (hl),e | |
34 | inc l | |
35 | ld (hl),d | |
36 | inc l | |
37 | ex de,hl | |
38 | add hl,bc | |
39 | ex de,hl | |
40 | dec a | |
41 | jr nz,ivt_i1 | |
42 | ret | |
43 | ||
44 | ||
45 | ;-------------------------------------------------------------------- | |
46 | ; Spurious interrupt handler | |
47 | ||
48 | cseg ; common area | |
49 | sp.int0: | |
50 | ld a,00h | |
51 | jr sp.i.1 | |
52 | sp.int.len equ $-sp.int0 | |
53 | ld a,01h | |
54 | jr sp.i.1 | |
55 | ld a,02h | |
56 | jr sp.i.1 | |
57 | ld a,03h | |
58 | jr sp.i.1 | |
59 | ld a,04h | |
60 | jr sp.i.1 | |
61 | ld a,05h | |
62 | jr sp.i.1 | |
63 | ld a,06h | |
64 | jr sp.i.1 | |
65 | ld a,07h | |
66 | jr sp.i.1 | |
67 | ld a,08h | |
68 | sp.i.1: | |
69 | ; out (80h),a | |
70 | ||
71 | add a,'0' | |
72 | ld (spi$nr),a | |
73 | ld hl,spi$msg | |
74 | call ?pmsg | |
75 | sp.i.2: | |
76 | halt | |
77 | jr sp.i.2 | |
78 | ||
79 | spi$msg: | |
80 | db 13,10,'Spurious Int: ' | |
81 | spi$nr: db '0' | |
82 | db 0 | |
83 | ||
84 | ;-------------------------------------------------------------------- | |
85 | ; | |
86 | ; Get/compute CPU clock | |
87 | ; | |
88 | ; return: | |
89 | ; hlde: CPU frequency (Hz) | |
90 | ; | |
91 | ||
92 | dseg | |
93 | ||
94 | cpu_frq: | |
95 | ld hl,0 | |
96 | ld d,h | |
97 | ld e,l | |
98 | call get_tmr | |
99 | push de | |
100 | push hl | |
101 | ||
102 | ; delay ~8ms @ 18.432MHz --> 147456 clock cycles | |
103 | ; delay ~10ms @ 18.432MHz --> 184320 clock cycles | |
104 | ; | |
105 | ||
106 | ; ld hl,8192 ; 147456/18 | |
107 | ld hl,(10240-100)*5 ; 184320/18 | |
108 | ld de,1 | |
109 | or a | |
110 | dly_lp: | |
111 | sbc hl,de ; 10 | |
112 | jr nz,dly_lp ; 6/8 -> 18 cycles | |
113 | ||
114 | pop hl | |
115 | pop de | |
116 | call get_tmr | |
117 | ||
118 | ld b,h | |
119 | ld c,l | |
120 | ld de,036EEh ;18432000/(2**16) * 50 | |
121 | ld hl,08000h ;18432000%(2**16) * 50 | |
122 | ||
123 | ld a,b | |
124 | or a | |
125 | jr nz,cpuf_div | |
126 | ld a,c | |
127 | cp 2 | |
128 | jr c,cpuf_done | |
129 | cpuf_div: | |
130 | call div32_r | |
131 | cpuf_done: | |
132 | ret | |
133 | ||
134 | ;-------------------------------------------------------------------- | |
135 | ||
136 | dseg | |
137 | get_tmr: | |
138 | push de | |
139 | push hl | |
140 | ld hl,1*256 + 3 ; h = subcommand, l = command | |
141 | push hl | |
142 | ld hl,0 | |
143 | add hl,sp | |
144 | ld b,6 | |
145 | call msg.sm | |
146 | ||
147 | dec sp | |
148 | ld hl,0 | |
149 | add hl,sp | |
150 | ld b,7 ; max receive message len | |
151 | call msg.recv | |
152 | ||
153 | pop bc | |
154 | inc sp | |
155 | pop hl | |
156 | pop de | |
157 | ret | |
158 | ||
159 | ;-------------------------------------------------------------------- | |
160 | ||
161 | cseg | |
162 | ||
163 | fifolst: | |
164 | rept 4 | |
165 | dw 0 | |
166 | endm | |
167 | ||
168 | ;-------------------------------------------------------------------- | |
169 | ||
170 | dseg | |
171 | ||
172 | bufinit: | |
173 | ld (ix+o.in_idx),0 ;reset pointers (empty fifo) | |
174 | ld (ix+o.out_idx),0 | |
175 | ld a,(ix+o.id) | |
176 | ld hl,fifolst | |
177 | ld e,a | |
178 | ld d,0 | |
179 | add hl,de | |
180 | add hl,de | |
181 | push ix | |
182 | pop de | |
183 | cp 4 | |
184 | jr nc,bfi_skip | |
185 | ||
186 | ld (hl),e | |
187 | inc hl | |
188 | ld (hl),d | |
189 | ||
190 | bfi_skip: | |
191 | ex de,hl | |
192 | call hwl2phy ;get phys. address of fifo | |
193 | ld c,a | |
194 | ld a,(ix+o.id) ;fifo id | |
195 | or a ;test if fifo 0 | |
196 | ret z | |
197 | ||
198 | bfi_1: | |
199 | ld b,a | |
200 | push bc ;c: bank-addr, b: ignored | |
201 | push hl ;address | |
202 | ld c,0 | |
203 | push bc ;c: function, b:subf | |
204 | ld b,5 | |
205 | ld h,c | |
206 | ld l,c | |
207 | add hl,sp | |
208 | call msg.sm | |
209 | pop hl | |
210 | pop hl | |
211 | pop hl | |
212 | ret | |
213 | ||
214 | ;---------------------------------------------------------------------- | |
215 | ||
216 | ||
217 | end |