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comparison pico_pcm.c @ 2434:2ee25a487e2b

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Fix some Pico ADPCM behaviors
author Michael Pavone <pavone@retrodev.com>
date Thu, 08 Feb 2024 20:44:44 -0800
parents 18816c5c11d4
children b8d894f7f9dc
comparison
equal deleted inserted replaced
2433:2907c3312423 2434:2ee25a487e2b
99 if (pcm->scope) { 99 if (pcm->scope) {
100 scope_add_sample(pcm->scope, pcm->scope_channel, (pcm->output >> shift) * 32, 0); 100 scope_add_sample(pcm->scope, pcm->scope_channel, (pcm->output >> shift) * 32, 0);
101 } 101 }
102 #endif 102 #endif
103 render_put_mono_sample(pcm->audio, (pcm->output >> shift) * 32); 103 render_put_mono_sample(pcm->audio, (pcm->output >> shift) * 32);
104 if (pcm->ctrl & PCM_RESET) {
105 //Anpanman Pico: Waku Waku Pan Koujou seems to expect the BUSY/RESET flag
106 //to be set for a while after reset
107 if (pcm->counter) {
108 pcm->counter--;
109 continue;
110 } else {
111 pcm->ctrl &= ~PCM_RESET;
112 }
113 }
114 /*
115 Unclear what this bit is actually supposed to do
116 But some games expect ADPCM to work with it cleared
117 Anpanman Pico: Waku Waku Pan Koujou sets the ctrl reg to $6040
104 if (!(pcm->ctrl & PCM_ENABLED)) { 118 if (!(pcm->ctrl & PCM_ENABLED)) {
105 continue; 119 continue;
106 } 120 }*/
107 if (pcm->counter) { 121 if (pcm->counter) {
108 pcm->counter--; 122 pcm->counter--;
109 } else if (pcm->samples) { 123 } else if (pcm->samples) {
110 pcm->samples--; 124 pcm->samples--;
111 uint8_t sample; 125 uint8_t sample;
170 // V: volume, probably attenuation value since converter defaults to "0" 184 // V: volume, probably attenuation value since converter defaults to "0"
171 void pico_pcm_ctrl_write(pico_pcm *pcm, uint16_t value) 185 void pico_pcm_ctrl_write(pico_pcm *pcm, uint16_t value)
172 { 186 {
173 if (value & PCM_RESET) { 187 if (value & PCM_RESET) {
174 pico_pcm_reset(pcm); 188 pico_pcm_reset(pcm);
175 } 189 pcm->counter = 2;
176 pcm->ctrl &= 0x8000; 190 }
177 pcm->ctrl |= value & ~PCM_RESET; 191 pcm->ctrl = value;
178 //TODO: update low-pass filter 192 //TODO: update low-pass filter
179 } 193 }
180 194
181 void pico_pcm_data_write(pico_pcm *pcm, uint16_t value) 195 void pico_pcm_data_write(pico_pcm *pcm, uint16_t value)
182 { 196 {