PS/2
Dependents: Synth Lab3Translator PS2_Keyboard CLI ... more
PS2MS_INIT.cpp@1:823c2798e398, 2010-09-29 (annotated)
- Committer:
- shintamainjp
- Date:
- Wed Sep 29 14:11:44 2010 +0000
- Revision:
- 1:823c2798e398
- Child:
- 2:a57bbbec16b1
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
shintamainjp | 1:823c2798e398 | 1 | /** |
shintamainjp | 1:823c2798e398 | 2 | * PS/2 mouse interface control class (Version 0.0.1) |
shintamainjp | 1:823c2798e398 | 3 | * |
shintamainjp | 1:823c2798e398 | 4 | * Copyright (C) 2010 Shinichiro Nakamura (CuBeatSystems) |
shintamainjp | 1:823c2798e398 | 5 | * http://shinta.main.jp/ |
shintamainjp | 1:823c2798e398 | 6 | */ |
shintamainjp | 1:823c2798e398 | 7 | #include "PS2MS_INIT.h" |
shintamainjp | 1:823c2798e398 | 8 | |
shintamainjp | 1:823c2798e398 | 9 | /** |
shintamainjp | 1:823c2798e398 | 10 | * Create. |
shintamainjp | 1:823c2798e398 | 11 | */ |
shintamainjp | 1:823c2798e398 | 12 | PS2MS_INIT::PS2MS_INIT(PinName clk_pin, PinName dat_pin) |
shintamainjp | 1:823c2798e398 | 13 | : clk(clk_pin), dat(dat_pin) { |
shintamainjp | 1:823c2798e398 | 14 | clk.input(); |
shintamainjp | 1:823c2798e398 | 15 | dat.input(); |
shintamainjp | 1:823c2798e398 | 16 | clk.write(1); |
shintamainjp | 1:823c2798e398 | 17 | dat.write(1); |
shintamainjp | 1:823c2798e398 | 18 | |
shintamainjp | 1:823c2798e398 | 19 | char txdat[17] = "\xFF\xFF\xFF\xF3\xC8\xF3\x64\xF3\x50\xF2\xE8\x03\xE6\xF3\x28\xF4"; |
shintamainjp | 1:823c2798e398 | 20 | const int n = sizeof(txdat); |
shintamainjp | 1:823c2798e398 | 21 | int txerrcnt = 0; |
shintamainjp | 1:823c2798e398 | 22 | int rxerrcnt = 0; |
shintamainjp | 1:823c2798e398 | 23 | for (int i = 0; i < n; i++) { |
shintamainjp | 1:823c2798e398 | 24 | if (send(txdat[i]) != 0) { |
shintamainjp | 1:823c2798e398 | 25 | txerrcnt++; |
shintamainjp | 1:823c2798e398 | 26 | } |
shintamainjp | 1:823c2798e398 | 27 | if (recv() < 0) { |
shintamainjp | 1:823c2798e398 | 28 | rxerrcnt++; |
shintamainjp | 1:823c2798e398 | 29 | } |
shintamainjp | 1:823c2798e398 | 30 | if (txdat[i] == 0xFF) { |
shintamainjp | 1:823c2798e398 | 31 | if (recv() < 0) { |
shintamainjp | 1:823c2798e398 | 32 | rxerrcnt++; |
shintamainjp | 1:823c2798e398 | 33 | } |
shintamainjp | 1:823c2798e398 | 34 | if (recv() < 0) { |
shintamainjp | 1:823c2798e398 | 35 | rxerrcnt++; |
shintamainjp | 1:823c2798e398 | 36 | } |
shintamainjp | 1:823c2798e398 | 37 | } |
shintamainjp | 1:823c2798e398 | 38 | } |
shintamainjp | 1:823c2798e398 | 39 | |
shintamainjp | 1:823c2798e398 | 40 | if (txerrcnt > 0) { |
shintamainjp | 1:823c2798e398 | 41 | // printf("TX %d errors occured.\n", txerrcnt); |
shintamainjp | 1:823c2798e398 | 42 | } |
shintamainjp | 1:823c2798e398 | 43 | if (rxerrcnt > 0) { |
shintamainjp | 1:823c2798e398 | 44 | // printf("RX %d errors occured.\n", rxerrcnt); |
shintamainjp | 1:823c2798e398 | 45 | } |
shintamainjp | 1:823c2798e398 | 46 | } |
shintamainjp | 1:823c2798e398 | 47 | |
shintamainjp | 1:823c2798e398 | 48 | /** |
shintamainjp | 1:823c2798e398 | 49 | * Destroy. |
shintamainjp | 1:823c2798e398 | 50 | */ |
shintamainjp | 1:823c2798e398 | 51 | PS2MS_INIT::~PS2MS_INIT() { |
shintamainjp | 1:823c2798e398 | 52 | } |
shintamainjp | 1:823c2798e398 | 53 | |
shintamainjp | 1:823c2798e398 | 54 | /** |
shintamainjp | 1:823c2798e398 | 55 | * Send a byte data. |
shintamainjp | 1:823c2798e398 | 56 | * |
shintamainjp | 1:823c2798e398 | 57 | * @param c a character. |
shintamainjp | 1:823c2798e398 | 58 | * |
shintamainjp | 1:823c2798e398 | 59 | * @return Negative value is a error number. |
shintamainjp | 1:823c2798e398 | 60 | */ |
shintamainjp | 1:823c2798e398 | 61 | int PS2MS_INIT::send(uint8_t c) { |
shintamainjp | 1:823c2798e398 | 62 | clk.output(); |
shintamainjp | 1:823c2798e398 | 63 | dat.output(); |
shintamainjp | 1:823c2798e398 | 64 | |
shintamainjp | 1:823c2798e398 | 65 | clk.write(0); |
shintamainjp | 1:823c2798e398 | 66 | wait_us(200); |
shintamainjp | 1:823c2798e398 | 67 | |
shintamainjp | 1:823c2798e398 | 68 | dat.write(0); |
shintamainjp | 1:823c2798e398 | 69 | wait_us(10); |
shintamainjp | 1:823c2798e398 | 70 | clk.write(1); |
shintamainjp | 1:823c2798e398 | 71 | wait_us(10); |
shintamainjp | 1:823c2798e398 | 72 | |
shintamainjp | 1:823c2798e398 | 73 | clk.input(); |
shintamainjp | 1:823c2798e398 | 74 | int parcnt = 0; |
shintamainjp | 1:823c2798e398 | 75 | for (int i = 0; i < 10; i++) { |
shintamainjp | 1:823c2798e398 | 76 | if (!waitClockDownEdge()) { |
shintamainjp | 1:823c2798e398 | 77 | return -1; |
shintamainjp | 1:823c2798e398 | 78 | } |
shintamainjp | 1:823c2798e398 | 79 | if ((0 <= i) && (i <= 7)) { |
shintamainjp | 1:823c2798e398 | 80 | /* |
shintamainjp | 1:823c2798e398 | 81 | * Data bit. |
shintamainjp | 1:823c2798e398 | 82 | */ |
shintamainjp | 1:823c2798e398 | 83 | if ((c & (1 << i)) == 0) { |
shintamainjp | 1:823c2798e398 | 84 | dat.write(0); |
shintamainjp | 1:823c2798e398 | 85 | } else { |
shintamainjp | 1:823c2798e398 | 86 | dat.write(1); |
shintamainjp | 1:823c2798e398 | 87 | parcnt++; |
shintamainjp | 1:823c2798e398 | 88 | } |
shintamainjp | 1:823c2798e398 | 89 | } |
shintamainjp | 1:823c2798e398 | 90 | if (i == 8) { |
shintamainjp | 1:823c2798e398 | 91 | /* |
shintamainjp | 1:823c2798e398 | 92 | * Parity bit. |
shintamainjp | 1:823c2798e398 | 93 | */ |
shintamainjp | 1:823c2798e398 | 94 | if ((parcnt % 2) == 0) { |
shintamainjp | 1:823c2798e398 | 95 | dat.write(1); |
shintamainjp | 1:823c2798e398 | 96 | } else { |
shintamainjp | 1:823c2798e398 | 97 | dat.write(0); |
shintamainjp | 1:823c2798e398 | 98 | } |
shintamainjp | 1:823c2798e398 | 99 | } |
shintamainjp | 1:823c2798e398 | 100 | if (i == 9) { |
shintamainjp | 1:823c2798e398 | 101 | /* |
shintamainjp | 1:823c2798e398 | 102 | * Stop bit. |
shintamainjp | 1:823c2798e398 | 103 | */ |
shintamainjp | 1:823c2798e398 | 104 | dat.write(1); |
shintamainjp | 1:823c2798e398 | 105 | } |
shintamainjp | 1:823c2798e398 | 106 | } |
shintamainjp | 1:823c2798e398 | 107 | dat.input(); |
shintamainjp | 1:823c2798e398 | 108 | |
shintamainjp | 1:823c2798e398 | 109 | /* |
shintamainjp | 1:823c2798e398 | 110 | * Check a ACK. |
shintamainjp | 1:823c2798e398 | 111 | */ |
shintamainjp | 1:823c2798e398 | 112 | if (!waitClockDownEdge()) { |
shintamainjp | 1:823c2798e398 | 113 | return -2; |
shintamainjp | 1:823c2798e398 | 114 | } |
shintamainjp | 1:823c2798e398 | 115 | if (dat.read() != 0) { |
shintamainjp | 1:823c2798e398 | 116 | return -3; |
shintamainjp | 1:823c2798e398 | 117 | } |
shintamainjp | 1:823c2798e398 | 118 | |
shintamainjp | 1:823c2798e398 | 119 | if (!waitClockUpLevel()) { |
shintamainjp | 1:823c2798e398 | 120 | return -4; |
shintamainjp | 1:823c2798e398 | 121 | } |
shintamainjp | 1:823c2798e398 | 122 | |
shintamainjp | 1:823c2798e398 | 123 | return 0; |
shintamainjp | 1:823c2798e398 | 124 | } |
shintamainjp | 1:823c2798e398 | 125 | |
shintamainjp | 1:823c2798e398 | 126 | /** |
shintamainjp | 1:823c2798e398 | 127 | * Receive a byte data. |
shintamainjp | 1:823c2798e398 | 128 | * |
shintamainjp | 1:823c2798e398 | 129 | * @return return a data. Negative value is a error number. |
shintamainjp | 1:823c2798e398 | 130 | */ |
shintamainjp | 1:823c2798e398 | 131 | int PS2MS_INIT::recv(void) { |
shintamainjp | 1:823c2798e398 | 132 | uint8_t c = 0; |
shintamainjp | 1:823c2798e398 | 133 | clk.input(); |
shintamainjp | 1:823c2798e398 | 134 | dat.input(); |
shintamainjp | 1:823c2798e398 | 135 | int parcnt = 0; |
shintamainjp | 1:823c2798e398 | 136 | for (int i = 0; i < 11; i++) { |
shintamainjp | 1:823c2798e398 | 137 | if (!waitClockDownEdge()) { |
shintamainjp | 1:823c2798e398 | 138 | return -1; |
shintamainjp | 1:823c2798e398 | 139 | } |
shintamainjp | 1:823c2798e398 | 140 | if (i == 0) { |
shintamainjp | 1:823c2798e398 | 141 | /* |
shintamainjp | 1:823c2798e398 | 142 | * Start bit. |
shintamainjp | 1:823c2798e398 | 143 | */ |
shintamainjp | 1:823c2798e398 | 144 | if (dat.read() != 0) { |
shintamainjp | 1:823c2798e398 | 145 | return -2; |
shintamainjp | 1:823c2798e398 | 146 | } |
shintamainjp | 1:823c2798e398 | 147 | } |
shintamainjp | 1:823c2798e398 | 148 | if ((1 <= i) && (i <= 8)) { |
shintamainjp | 1:823c2798e398 | 149 | /* |
shintamainjp | 1:823c2798e398 | 150 | * Data bit. |
shintamainjp | 1:823c2798e398 | 151 | */ |
shintamainjp | 1:823c2798e398 | 152 | if (dat.read() == 0) { |
shintamainjp | 1:823c2798e398 | 153 | c &= ~(1 << (i - 1)); |
shintamainjp | 1:823c2798e398 | 154 | } else { |
shintamainjp | 1:823c2798e398 | 155 | c |= (1 << (i - 1)); |
shintamainjp | 1:823c2798e398 | 156 | parcnt++; |
shintamainjp | 1:823c2798e398 | 157 | } |
shintamainjp | 1:823c2798e398 | 158 | } |
shintamainjp | 1:823c2798e398 | 159 | if (i == 9) { |
shintamainjp | 1:823c2798e398 | 160 | /* |
shintamainjp | 1:823c2798e398 | 161 | * Parity bit. |
shintamainjp | 1:823c2798e398 | 162 | */ |
shintamainjp | 1:823c2798e398 | 163 | if (dat.read() == 0) { |
shintamainjp | 1:823c2798e398 | 164 | if ((parcnt % 2) != 1) { |
shintamainjp | 1:823c2798e398 | 165 | return -3; |
shintamainjp | 1:823c2798e398 | 166 | } |
shintamainjp | 1:823c2798e398 | 167 | } else { |
shintamainjp | 1:823c2798e398 | 168 | if ((parcnt % 2) != 0) { |
shintamainjp | 1:823c2798e398 | 169 | return -4; |
shintamainjp | 1:823c2798e398 | 170 | } |
shintamainjp | 1:823c2798e398 | 171 | } |
shintamainjp | 1:823c2798e398 | 172 | } |
shintamainjp | 1:823c2798e398 | 173 | if (i == 10) { |
shintamainjp | 1:823c2798e398 | 174 | /* |
shintamainjp | 1:823c2798e398 | 175 | * Stop bit. |
shintamainjp | 1:823c2798e398 | 176 | */ |
shintamainjp | 1:823c2798e398 | 177 | if (dat.read() != 1) { |
shintamainjp | 1:823c2798e398 | 178 | return -5; |
shintamainjp | 1:823c2798e398 | 179 | } |
shintamainjp | 1:823c2798e398 | 180 | } |
shintamainjp | 1:823c2798e398 | 181 | } |
shintamainjp | 1:823c2798e398 | 182 | return (int)c; |
shintamainjp | 1:823c2798e398 | 183 | } |
shintamainjp | 1:823c2798e398 | 184 | |
shintamainjp | 1:823c2798e398 | 185 | /** |
shintamainjp | 1:823c2798e398 | 186 | * Wait a clock down edge. |
shintamainjp | 1:823c2798e398 | 187 | * |
shintamainjp | 1:823c2798e398 | 188 | * @return true if wait done. |
shintamainjp | 1:823c2798e398 | 189 | */ |
shintamainjp | 1:823c2798e398 | 190 | bool PS2MS_INIT::waitClockDownEdge(void) { |
shintamainjp | 1:823c2798e398 | 191 | int cnt; |
shintamainjp | 1:823c2798e398 | 192 | /* |
shintamainjp | 1:823c2798e398 | 193 | * Wait until clock is low. |
shintamainjp | 1:823c2798e398 | 194 | */ |
shintamainjp | 1:823c2798e398 | 195 | cnt = 0; |
shintamainjp | 1:823c2798e398 | 196 | while (clk.read() == 0) { |
shintamainjp | 1:823c2798e398 | 197 | cnt++; |
shintamainjp | 1:823c2798e398 | 198 | if (MAX_RETRY < cnt) { |
shintamainjp | 1:823c2798e398 | 199 | return false; |
shintamainjp | 1:823c2798e398 | 200 | } |
shintamainjp | 1:823c2798e398 | 201 | wait_us(1); |
shintamainjp | 1:823c2798e398 | 202 | } |
shintamainjp | 1:823c2798e398 | 203 | /* |
shintamainjp | 1:823c2798e398 | 204 | * Wait until clock is high. |
shintamainjp | 1:823c2798e398 | 205 | */ |
shintamainjp | 1:823c2798e398 | 206 | cnt = 0; |
shintamainjp | 1:823c2798e398 | 207 | while (clk.read() == 1) { |
shintamainjp | 1:823c2798e398 | 208 | cnt++; |
shintamainjp | 1:823c2798e398 | 209 | if (MAX_RETRY < cnt) { |
shintamainjp | 1:823c2798e398 | 210 | return false; |
shintamainjp | 1:823c2798e398 | 211 | } |
shintamainjp | 1:823c2798e398 | 212 | wait_us(1); |
shintamainjp | 1:823c2798e398 | 213 | } |
shintamainjp | 1:823c2798e398 | 214 | return true; |
shintamainjp | 1:823c2798e398 | 215 | } |
shintamainjp | 1:823c2798e398 | 216 | |
shintamainjp | 1:823c2798e398 | 217 | /** |
shintamainjp | 1:823c2798e398 | 218 | * Wait a clock up level. |
shintamainjp | 1:823c2798e398 | 219 | * |
shintamainjp | 1:823c2798e398 | 220 | * @return true if wait done. |
shintamainjp | 1:823c2798e398 | 221 | */ |
shintamainjp | 1:823c2798e398 | 222 | bool PS2MS_INIT::waitClockUpLevel(void) { |
shintamainjp | 1:823c2798e398 | 223 | int cnt; |
shintamainjp | 1:823c2798e398 | 224 | /* |
shintamainjp | 1:823c2798e398 | 225 | * Wait until clock is low. |
shintamainjp | 1:823c2798e398 | 226 | */ |
shintamainjp | 1:823c2798e398 | 227 | cnt = 0; |
shintamainjp | 1:823c2798e398 | 228 | while (clk.read() == 0) { |
shintamainjp | 1:823c2798e398 | 229 | cnt++; |
shintamainjp | 1:823c2798e398 | 230 | if (MAX_RETRY < cnt) { |
shintamainjp | 1:823c2798e398 | 231 | return false; |
shintamainjp | 1:823c2798e398 | 232 | } |
shintamainjp | 1:823c2798e398 | 233 | wait_us(1); |
shintamainjp | 1:823c2798e398 | 234 | } |
shintamainjp | 1:823c2798e398 | 235 | return true; |
shintamainjp | 1:823c2798e398 | 236 | } |