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giovannino
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Post subject: Strange behaviour of arm_run slice Posted: Mon Feb 28, 2011 6:49 am |
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Joined: Mon Jan 31, 2011 3:56 am Posts: 10
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i used following code:
uint32_t arm_run_slice( uint32_t num_samples ) {
//JoeFix TODO: //when the number of samples played surpass 32768 the program trips out int i,j; int k; int val2=0; if( !armr.running ) return num_samples; joe_arm_counter++; for( i=0; i<num_samples; i++ ) { for( j=0; j < CYCLES_PER_SAMPLE; j++ ) { armr.icount++; if( !arm_execute_instruction() ) return i; #ifdef ENABLE_DEBUG_MODE for( k=0; k<arm_breakpoint_count; k++ ) { if( arm_breakpoints[k].address == armr.r[15] ) { dreamcast_stop(); if( arm_breakpoints[k].type == BREAK_ONESHOT ) arm_clear_breakpoint( armr.r[15], BREAK_ONESHOT ); return i; } } #endif }
k = MMIO_READ( AICA2, AICA_TCR ); uint8_t val = MMIO_READ( AICA2, AICA_TIMER ); val++; if( val == 0 ) { aica_event( AICA_EVENT_TIMER ); fprintf(stderr,"MMIO WRITE k%d i=%d j=%d cnt=%d\n",k,i,j,joe_arm_counter); MMIO_WRITE( AICA2, AICA_TCR, k & ~0x40 ); } MMIO_WRITE( AICA2, AICA_TIMER, val ); fprintf(stderr,"MMIO VAL=%d\n",val); if( !dreamcast_is_running() ) break; }
return i; }
here the result MMIO WRITE k1983 i=31 j=41 cnt=667 MMIO VAL=0 MMIO VAL=1 MMIO VAL=2 MMIO VAL=3 MMIO VAL=4 MMIO VAL=5 MMIO VAL=6 MMIO VAL=7 MMIO VAL=8 MMIO VAL=9 MMIO VAL=10 MMIO VAL=11 MMIO VAL=12 MMIO VAL=13 MMIO VAL=14 MMIO VAL=15 MMIO VAL=16 MMIO VAL=17 MMIO VAL=18 MMIO VAL=19 MMIO VAL=20 MMIO VAL=21 MMIO VAL=22 MMIO VAL=23 MMIO VAL=24 MMIO VAL=25 MMIO VAL=26 MMIO VAL=27 MMIO VAL=28 MMIO VAL=29 MMIO VAL=30 MMIO VAL=31 MMIO VAL=32 MMIO VAL=33 MMIO VAL=34 MMIO VAL=35 MMIO VAL=36 MMIO VAL=37 MMIO VAL=38 MMIO VAL=39 MMIO VAL=40 MMIO VAL=41 MMIO VAL=42 MMIO VAL=43 MMIO VAL=44 MMIO VAL=45 MMIO VAL=46 MMIO VAL=47 MMIO VAL=48 MMIO VAL=49 MMIO VAL=50 MMIO VAL=51 MMIO VAL=52 MMIO VAL=53 MMIO VAL=54 MMIO VAL=55 MMIO VAL=56 MMIO VAL=57 MMIO VAL=58 MMIO VAL=59 MMIO VAL=60 MMIO VAL=61 MMIO VAL=62 MMIO VAL=63 MMIO VAL=64 MMIO VAL=65 MMIO VAL=66 MMIO VAL=67 MMIO VAL=68 MMIO VAL=69 MMIO VAL=70 MMIO VAL=71 MMIO VAL=72 MMIO VAL=73 MMIO VAL=74 MMIO VAL=75 MMIO VAL=76 MMIO VAL=77 MMIO VAL=78 MMIO VAL=79 MMIO VAL=80 MMIO VAL=81 MMIO VAL=82 MMIO VAL=83 MMIO VAL=84 MMIO VAL=85 MMIO VAL=86 MMIO VAL=87 MMIO VAL=88 MMIO VAL=89 MMIO VAL=90 MMIO VAL=91 MMIO VAL=92 MMIO VAL=93 MMIO VAL=94 MMIO VAL=95 MMIO VAL=96 MMIO VAL=97 MMIO VAL=98 MMIO VAL=99 MMIO VAL=100 MMIO VAL=101 MMIO VAL=102 MMIO VAL=103 MMIO VAL=104 MMIO VAL=105 MMIO VAL=106 MMIO VAL=107 MMIO VAL=108 MMIO VAL=109 MMIO VAL=110 MMIO VAL=111 MMIO VAL=112 MMIO VAL=113 MMIO VAL=114 MMIO VAL=115 MMIO VAL=116 MMIO VAL=117 MMIO VAL=118 MMIO VAL=119 MMIO VAL=120 MMIO VAL=121 MMIO VAL=122 MMIO VAL=123 MMIO VAL=124 MMIO VAL=125 MMIO VAL=126 MMIO VAL=127 MMIO VAL=128 MMIO VAL=129 MMIO VAL=130 MMIO VAL=131 MMIO VAL=132 MMIO VAL=133 MMIO VAL=134 MMIO VAL=135 MMIO VAL=136 MMIO VAL=137 MMIO VAL=138 MMIO VAL=139 MMIO VAL=140 MMIO VAL=141 MMIO VAL=142 MMIO VAL=143 MMIO VAL=144 MMIO VAL=145 MMIO VAL=146 MMIO VAL=147 MMIO VAL=148 MMIO VAL=149 MMIO VAL=150 MMIO VAL=151 MMIO VAL=152 MMIO VAL=153 MMIO VAL=154 MMIO VAL=155 MMIO VAL=156 MMIO VAL=157 MMIO VAL=158 MMIO VAL=159 MMIO VAL=160 MMIO VAL=161 MMIO VAL=162 MMIO VAL=163 MMIO VAL=164 MMIO VAL=165 MMIO VAL=166 MMIO VAL=167 MMIO VAL=168 MMIO VAL=169 MMIO VAL=170 MMIO VAL=171 MMIO VAL=172 MMIO VAL=173 MMIO VAL=174 MMIO VAL=175 MMIO VAL=176 MMIO VAL=177 MMIO VAL=178 MMIO VAL=179 MMIO VAL=180 MMIO VAL=181 MMIO VAL=182 MMIO VAL=183 MMIO VAL=184 MMIO VAL=185 MMIO VAL=186 MMIO VAL=187 MMIO VAL=188 MMIO VAL=189 MMIO VAL=190 MMIO VAL=191 MMIO VAL=192 MMIO VAL=193 MMIO VAL=194 MMIO VAL=195 MMIO VAL=196 MMIO VAL=197 MMIO VAL=198 MMIO VAL=199 MMIO VAL=200 MMIO VAL=201 MMIO VAL=202 MMIO VAL=203 MMIO VAL=204 MMIO VAL=205 MMIO VAL=206 MMIO VAL=207 MMIO VAL=208 MMIO VAL=209 MMIO VAL=210 MMIO VAL=211 MMIO VAL=212 MMIO VAL=213 MMIO VAL=214 MMIO VAL=215 MMIO VAL=216 MMIO VAL=217 MMIO VAL=218 MMIO VAL=219 MMIO VAL=220 MMIO VAL=221 MMIO VAL=222 MMIO VAL=223 MMIO VAL=224 MMIO VAL=225 MMIO VAL=226 MMIO VAL=227 MMIO VAL=228 MMIO VAL=229 MMIO VAL=230 MMIO VAL=231 MMIO VAL=232 MMIO VAL=233 MMIO VAL=234 MMIO VAL=235 MMIO VAL=236 MMIO VAL=237 MMIO VAL=238 MMIO VAL=239 MMIO VAL=240 MMIO VAL=241 MMIO VAL=242 MMIO VAL=243 MMIO VAL=244 MMIO VAL=245 MMIO VAL=246 MMIO VAL=247 MMIO VAL=248 MMIO VAL=249 MMIO VAL=250 MMIO VAL=251 MMIO VAL=252 MMIO VAL=253 MMIO VAL=254 MMIO VAL=255 MMIO WRITE k1983 i=47 j=41 cnt=672 MMIO VAL=0 MMIO VAL=1 MMIO VAL=2 MMIO VAL=3 MMIO VAL=4 MMIO VAL=5 MMIO VAL=6 MMIO VAL=7 MMIO VAL=8 MMIO VAL=9 MMIO VAL=10 MMIO VAL=11 MMIO VAL=12 MMIO VAL=13 MMIO VAL=14 MMIO VAL=15 MMIO VAL=16 MMIO VAL=17 MMIO VAL=18 MMIO VAL=19 MMIO VAL=20 MMIO VAL=21 MMIO VAL=22 MMIO VAL=23 MMIO VAL=24 MMIO VAL=25 MMIO VAL=26 MMIO VAL=27 MMIO VAL=28 MMIO VAL=29 MMIO VAL=30 MMIO VAL=31 MMIO VAL=32 MMIO VAL=33 MMIO VAL=34 MMIO VAL=35 MMIO VAL=36 MMIO VAL=37 MMIO VAL=38 MMIO VAL=39 MMIO VAL=40 MMIO VAL=41 MMIO VAL=42 MMIO VAL=43 MMIO VAL=44 MMIO VAL=45 MMIO VAL=46 MMIO VAL=47 MMIO VAL=48 MMIO VAL=49 MMIO VAL=50 MMIO VAL=51 MMIO VAL=52 MMIO VAL=53 MMIO VAL=54 MMIO VAL=55 MMIO VAL=56 MMIO VAL=57 MMIO VAL=58 MMIO VAL=59 MMIO VAL=60 MMIO VAL=61 MMIO VAL=62 MMIO VAL=63 MMIO VAL=64 MMIO VAL=65 MMIO VAL=66 MMIO VAL=67 MMIO VAL=68 MMIO VAL=69 MMIO VAL=70 MMIO VAL=71 MMIO VAL=72 MMIO VAL=73 MMIO VAL=74 MMIO VAL=75 MMIO VAL=76 MMIO VAL=77 MMIO VAL=78 MMIO VAL=79 MMIO VAL=80 MMIO VAL=81 MMIO VAL=82 MMIO VAL=83 MMIO VAL=84 MMIO VAL=85 MMIO VAL=86 MMIO VAL=87 MMIO VAL=88 MMIO VAL=89 MMIO VAL=90 MMIO VAL=91 MMIO VAL=92 MMIO VAL=93 MMIO VAL=94 MMIO VAL=95 MMIO VAL=96 MMIO VAL=97 MMIO VAL=98 MMIO VAL=99 MMIO VAL=213 MMIO VAL=214 MMIO VAL=215 MMIO VAL=216 MMIO VAL=217 MMIO VAL=218 MMIO VAL=219 MMIO VAL=220 MMIO VAL=221 MMIO VAL=222 MMIO VAL=223 MMIO VAL=224 MMIO VAL=225 MMIO VAL=226 MMIO VAL=227 MMIO VAL=228 MMIO VAL=229 MMIO VAL=230 MMIO VAL=231 MMIO VAL=232 MMIO VAL=233 MMIO VAL=234 MMIO VAL=235 MMIO VAL=236 MMIO VAL=237 MMIO VAL=238 MMIO VAL=239 MMIO VAL=240 MMIO VAL=241 MMIO VAL=242 MMIO VAL=243 MMIO VAL=244 MMIO VAL=245 MMIO VAL=246 MMIO VAL=247 MMIO VAL=248 MMIO VAL=249 MMIO VAL=250 MMIO VAL=251 MMIO VAL=252 MMIO VAL=253 MMIO VAL=254 MMIO VAL=255 MMIO WRITE k72 i=46 j=41 cnt=675 HERE INSTEAD OF 0-255 only 212-255 MMIO VAL=0 MMIO VAL=213 MMIO VAL=214 MMIO VAL=215 MMIO VAL=216 MMIO VAL=217 MMIO VAL=218
i noticed that this may be reated to the fact that 675*48 very near to 32768 is so maybe a 16 bit problem please note that cycles_per samples is set to 41 and num_samples to 48
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nkeynes
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Post subject: Re: Strange behaviour of arm_run slice Posted: Tue Mar 01, 2011 12:43 am |
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Joined: Mon Jun 26, 2006 9:47 pm Posts: 293
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Caveat: It's entirely possible that large chunks of the AICA implementation are completely wrong and based on me wildly misunderstanding how the chip is supposed to work. Having said that, as I understand it:
The register you're looking at is an 8-bit timer. It ticks up for each sample, and triggers an interrupt on overflow. The interrupt handler then normally resets the timer so it goes off again after an appropriate number of samples. 212 is likely to be common - it's 44 samples, or as close as the timer resolution can get to 1ms.
Cheers, Nathan
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giovannino
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Post subject: Re: Strange behaviour of arm_run slice Posted: Tue Mar 01, 2011 4:42 pm |
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Joined: Mon Jan 31, 2011 3:56 am Posts: 10
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I understand but should it be reset to 0 instead of 212 ?
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nkeynes
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Post subject: Re: Strange behaviour of arm_run slice Posted: Wed Mar 02, 2011 2:03 am |
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Joined: Mon Jun 26, 2006 9:47 pm Posts: 293
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