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Initial work on emulating the YMZ263B in the Copera
author Michael Pavone <pavone@retrodev.com>
date Fri, 23 Feb 2024 01:16:38 -0800
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children a25e8f304343
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2460
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1 #include <string.h>
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2 #include "ymz263b.h"
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3 #include "backend.h"
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4
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5 enum {
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6 YMZ_SELT,
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7 YMZ_LSI_TEST,
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8 YMZ_TIMER0_LOW,
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9 YMZ_TIMER0_HIGH,
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10 YMZ_TIMER_BASE,
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11 YMZ_TIMER1,
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12 YMZ_TIMER2_LOW,
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13 YMZ_TIMER2_HIGH,
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14 YMZ_TIMER_CTRL,
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15 YMZ_PCM_PLAY_CTRL,
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16 YMZ_PCM_VOL,
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17 YMZ_PCM_DATA,
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18 YMZ_PCM_CTRL,
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19 YMZ_MIDI_CTRL,
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20 YMZ_MIDI_DATA
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21 };
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22
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23 //YMZ_SELT
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24 #define BIT_SELT 0x01
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25
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26 //YMZ_TIMER_CTRL
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27 #define BIT_ST0 0x01
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28 #define BIT_ST1 0x02
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29 #define BIT_ST2 0x04
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30 #define BIT_STBC 0x08
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31 #define BIT_T0_MSK 0x10
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32 #define BIT_T1_MSK 0x20
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33 #define BIT_T2_MSK 0x40
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34
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35 #define TIMER_RUN_MASK (BIT_ST0|BIT_ST1|BIT_ST2)
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36 #define TIMER_INT_MASK (BIT_T0_MSK|BIT_T1_MSK|BIT_T2_MSK)
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37
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38 //YMZ_PCM_PLAY_CTRL
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39 #define BIT_ADP_RST 0x80
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40
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41 //YMZ_MIDI_CTRL
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42 #define BIT_MSK_RRQ 0x01
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43 #define BIT_MRC_RST 0x02
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44 #define BIT_MSK_TRQ 0x04
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45 #define BIT_MTR_RST 0x08
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46 #define BIT_MSK_MOV 0x10
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47 #define BIT_MSK_POV 0x20
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48
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49 #define STATUS_FIF1 0x01
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50 #define STATUS_FIF2 0x02
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51 #define STATUS_RRQ 0x04
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52 #define STATUS_TRQ 0x08
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53 #define STATUS_T0 0x10
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54 #define STATUS_T1 0x20
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55 #define STATUS_T2 0x40
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56 #define STATUS_OV 0x80
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57
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58 #define MIDI_BYTE_DIVIDER 170
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59
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60 #define FIFO_EMPTY 255
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61 void ymz263b_init(ymz263b *ymz, uint32_t clock_divider)
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62 {
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63 memset(ymz, 0, sizeof(*ymz));
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64 ymz->clock_inc = clock_divider * 32;
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65 ymz->base_regs[YMZ_SELT] = 1;
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66 ymz->pcm[0].regs[0] = BIT_ADP_RST;
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67 ymz->pcm[1].regs[0] = BIT_ADP_RST;
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68 ymz->midi_regs[0] = BIT_MTR_RST | BIT_MRC_RST;
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69 ymz->midi_trs.read = ymz->midi_rcv.read = FIFO_EMPTY;
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70 ymz->status = 0;
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71 }
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72
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73 static uint8_t fifo_empty(ymz_midi_fifo *fifo)
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74 {
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75 return fifo->read == FIFO_EMPTY;
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76 }
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77
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78 static uint8_t fifo_read(ymz_midi_fifo *fifo)
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79 {
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80 uint8_t ret = fifo->fifo[fifo->read++];
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81 fifo->read &= 15;
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82 if (fifo->read == fifo->write) {
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83 fifo->read = FIFO_EMPTY;
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84 }
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85 return ret;
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86 }
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87
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88 static uint8_t fifo_write(ymz_midi_fifo *fifo, uint8_t value)
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89 {
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90 uint8_t overflow = fifo->read == fifo->write;
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91 if (fifo->read == FIFO_EMPTY) {
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92 fifo->read = fifo->write;
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93 }
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94 fifo->fifo[fifo->write++] = value;
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95 fifo->write &= 15;
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96 return overflow;
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97 }
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98
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99 static uint8_t fifo_size(ymz_midi_fifo *fifo)
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100 {
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101 if (fifo->read == FIFO_EMPTY) {
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102 return 0;
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103 }
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104 if (fifo->read == fifo->write) {
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105 return 16;
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106 }
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107 return (fifo->write - fifo->read) & 15;
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108 }
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109
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110 void ymz263b_run(ymz263b *ymz, uint32_t target_cycle)
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111 {
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112 uint8_t timer_ctrl = ymz->base_regs[YMZ_TIMER_CTRL];
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113 for (; ymz->cycle < target_cycle; ymz->cycle += ymz->clock_inc)
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114 {
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115 if (timer_ctrl & BIT_ST0) {
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116 if (ymz->timers[0]) {
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117 ymz->timers[0]--;
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118 } else {
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119 ymz->timers[0] = ymz->base_regs[YMZ_TIMER0_HIGH] << 8 | ymz->base_regs[YMZ_TIMER0_LOW];
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120 ymz->status |= STATUS_T0;
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121 }
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122 }
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123 if (timer_ctrl & BIT_STBC) {
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124 if (ymz->timers[3]) {
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125 ymz->timers[3]--;
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126 } else {
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parents:
diff changeset
127 ymz->timers[3] = ymz->base_regs[YMZ_TIMER1] << 8 & 0xF00;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
128 ymz->timers[3] |= ymz->base_regs[YMZ_TIMER_BASE];
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
129
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parents:
diff changeset
130 if (timer_ctrl & BIT_ST1) {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
131 if (ymz->timers[1]) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
132 ymz->timers[1]--;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
133 } else {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
134 ymz->timers[1] = ymz->base_regs[YMZ_TIMER1] >> 4;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
135 ymz->status |= STATUS_T1;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
136 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
137 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
138
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
139 if (timer_ctrl & BIT_ST2) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
140 if (ymz->timers[2]) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
141 ymz->timers[2]--;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
142 } else {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
143 ymz->timers[2] = ymz->base_regs[YMZ_TIMER2_HIGH] << 8 | ymz->base_regs[YMZ_TIMER2_LOW];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
144 ymz->status |= STATUS_T2;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
145 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
146 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
147 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
148 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
149 if (!(ymz->midi_regs[0] & BIT_MTR_RST) && !fifo_empty(&ymz->midi_trs)) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
150 if (ymz->midi_transmit) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
151 --ymz->midi_transmit;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
152 } else {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
153 ymz->midi_transmit = MIDI_BYTE_DIVIDER - 1;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
154 //TODO: send this byte to MIDI device
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
155 uint8_t byte = fifo_read(&ymz->midi_trs);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
156 printf("MIDI Transmit: %X\n", byte);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
157 if (fifo_empty(&ymz->midi_trs)) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
158 ymz->status |= STATUS_TRQ;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
159 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
160 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
161 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
162 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
163 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
164
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
165 uint32_t ymz263b_next_int(ymz263b *ymz)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
166 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 //TODO: Handle FIFO and MIDI receive interrupts
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 uint8_t enabled_ints = (~ymz->base_regs[YMZ_TIMER_CTRL]) & TIMER_INT_MASK;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 if (!(ymz->base_regs[YMZ_MIDI_CTRL] & (BIT_MTR_RST|BIT_MSK_TRQ))) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170 enabled_ints |= STATUS_TRQ;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
172 if (!enabled_ints) {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
173 return CYCLE_NEVER;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
174 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
175 //Handle currently pending interrupts
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
176 if (enabled_ints & ymz->status) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
177 return ymz->cycle;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
178 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
179 uint32_t ret = CYCLE_NEVER;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
180 if (enabled_ints & STATUS_TRQ) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
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parents:
diff changeset
181 uint8_t bytes = fifo_size(&ymz->midi_trs);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182 if (bytes) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 ret = ymz->cycle + (ymz->midi_transmit + 1) * ymz->clock_inc;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
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parents:
diff changeset
184 if (bytes > 1) {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 ret += MIDI_BYTE_DIVIDER * ymz->clock_inc * (bytes - 1);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
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parents:
diff changeset
186 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
189 enabled_ints >>= 4;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
190 //If timers aren't already expired, interrupts can't fire unless the timers are enabled
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
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parents:
diff changeset
191 enabled_ints &= ymz->base_regs[YMZ_TIMER_CTRL];
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parents:
diff changeset
192 if (!(ymz->base_regs[YMZ_TIMER_CTRL] & BIT_STBC)) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 //Timer 1 and Timer 2 depend on the base timer
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parents:
diff changeset
194 enabled_ints &= 1;
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parents:
diff changeset
195 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
196 if (enabled_ints & BIT_ST0) {
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parents:
diff changeset
197 uint32_t t0 = ymz->cycle + (ymz->timers[0] + 1) * ymz->clock_inc;
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parents:
diff changeset
198 if (t0 < ret) {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 ret = t0;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 if (enabled_ints & (BIT_ST1|BIT_ST2)) {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
203 uint32_t base = ymz->cycle + (ymz->timers[3] + 1) * ymz->clock_inc;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
204 if (base < ret) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
205 uint32_t load = (ymz->base_regs[YMZ_TIMER1] << 8 & 0xF00) | ymz->base_regs[YMZ_TIMER_BASE];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
206 if (enabled_ints & BIT_ST1) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
207 uint32_t t1 = ymz->timers[1] * (load + 1) * ymz->clock_inc;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
208 if (t1 < ret) {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
209 ret = t1;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
210 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
211 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
212 if (enabled_ints & BIT_ST2) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
213 uint32_t t2 = ymz->timers[2] * (load + 1) * ymz->clock_inc;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
214 if (t2 < ret) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
215 ret = t2;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
216 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
217 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
218 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
219 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
220 return ret;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
221 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
222
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
223 void ymz263b_address_write(ymz263b *ymz, uint8_t value)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
224 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
225 ymz->address = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
226 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
227
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
228 void ymz263b_data_write(ymz263b *ymz, uint32_t channel, uint8_t value)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
229 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
230 if (channel) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
231 if (ymz->address >= YMZ_PCM_PLAY_CTRL && ymz->address < YMZ_MIDI_CTRL) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
232 ymz->pcm[1].regs[ymz->address - YMZ_PCM_PLAY_CTRL] = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
233 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
234 } else {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
235 if (ymz->address < YMZ_PCM_PLAY_CTRL) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
236 ymz->base_regs[ymz->address] = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
237 } else if (ymz->address < YMZ_MIDI_CTRL) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
238 ymz->pcm[0].regs[ymz->address - YMZ_PCM_PLAY_CTRL] = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
239 } else {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
240 ymz->midi_regs[ymz->address - YMZ_MIDI_CTRL] = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
241 if (ymz->address == YMZ_MIDI_DATA) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
242 ymz->status &= ~STATUS_TRQ;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
243 if (fifo_empty(&ymz->midi_trs)) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
244 ymz->midi_transmit = MIDI_BYTE_DIVIDER - 1;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
245 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
246 fifo_write(&ymz->midi_trs, value);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
247 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
248 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
249 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
250 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
251
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera
Michael Pavone <pavone@retrodev.com>
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252 uint8_t ymz263b_data_read(ymz263b *ymz, uint32_t channel)
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253 {
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254 //TODO: Supposedly only a few registers are actually readable
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255 if (channel) {
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256 if (ymz->address >= YMZ_PCM_PLAY_CTRL && ymz->address < YMZ_MIDI_CTRL) {
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257 return ymz->pcm[1].regs[ymz->address - YMZ_PCM_PLAY_CTRL];
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258 }
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259 } else {
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260 if (ymz->address < YMZ_PCM_PLAY_CTRL) {
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261 return ymz->base_regs[ymz->address];
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262 } else if (ymz->address < YMZ_MIDI_CTRL) {
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263 return ymz->pcm[0].regs[ymz->address - YMZ_PCM_PLAY_CTRL];
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264 } else {
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265 return ymz->midi_regs[ymz->address - YMZ_MIDI_CTRL];
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266 }
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267 }
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268 return 0XFF;
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269 }
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270
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271 uint8_t ymz263b_status_read(ymz263b *ymz)
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272 {
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273 uint8_t ret = ymz->status;
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274 ymz->status = 0;//&= ~(STATUS_T0|STATUS_T1|STATUS_T2);
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275 return ret;
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276 }