Martin Woolley
x
Dependencies: BLE_API mbed-dev-bin nRF51822
Fork of
microbit-dal
by 
Lancaster University
source/core/MicroBitDevice.cpp@1:8aa5cdb4ab67, 2016-04-07 (annotated)
- Committer:
- Jonathan Austin
- Date:
- Thu Apr 07 01:33:22 2016 +0100
- Revision:
- 1:8aa5cdb4ab67
- Child:
- 47:69f452b1a5c9
Synchronized with git rev 55cb9199
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| Jonathan Austin |
1:8aa5cdb4ab67 | 1 | /* |
| Jonathan Austin |
1:8aa5cdb4ab67 | 2 | The MIT License (MIT) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 3 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 4 | Copyright (c) 2016 British Broadcasting Corporation. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 5 | This software is provided by Lancaster University by arrangement with the BBC. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 6 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 7 | Permission is hereby granted, free of charge, to any person obtaining a |
| Jonathan Austin |
1:8aa5cdb4ab67 | 8 | copy of this software and associated documentation files (the "Software"), |
| Jonathan Austin |
1:8aa5cdb4ab67 | 9 | to deal in the Software without restriction, including without limitation |
| Jonathan Austin |
1:8aa5cdb4ab67 | 10 | the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 11 | and/or sell copies of the Software, and to permit persons to whom the |
| Jonathan Austin |
1:8aa5cdb4ab67 | 12 | Software is furnished to do so, subject to the following conditions: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 13 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 14 | The above copyright notice and this permission notice shall be included in |
| Jonathan Austin |
1:8aa5cdb4ab67 | 15 | all copies or substantial portions of the Software. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 16 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 17 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| Jonathan Austin |
1:8aa5cdb4ab67 | 18 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 19 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| Jonathan Austin |
1:8aa5cdb4ab67 | 20 | THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| Jonathan Austin |
1:8aa5cdb4ab67 | 21 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| Jonathan Austin |
1:8aa5cdb4ab67 | 22 | FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| Jonathan Austin |
1:8aa5cdb4ab67 | 23 | DEALINGS IN THE SOFTWARE. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 24 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 25 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 26 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 27 | * Compatibility / portability funcitons and constants for the MicroBit DAL. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 28 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 29 | #include "MicroBitConfig.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 30 | #include "MicroBitButton.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 31 | #include "MicroBitDevice.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 32 | #include "MicroBitFont.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 33 | #include "mbed.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 34 | #include "ErrorNo.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 35 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 36 | /* |
| Jonathan Austin |
1:8aa5cdb4ab67 | 37 | * The underlying Nordic libraries that support BLE do not compile cleanly with the stringent GCC settings we employ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 38 | * If we're compiling under GCC, then we suppress any warnings generated from this code (but not the rest of the DAL) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 39 | * The ARM cc compiler is more tolerant. We don't test __GNUC__ here to detect GCC as ARMCC also typically sets this |
| Jonathan Austin |
1:8aa5cdb4ab67 | 40 | * as a compatability option, but does not support the options used... |
| Jonathan Austin |
1:8aa5cdb4ab67 | 41 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 42 | #if !defined(__arm) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 43 | #pragma GCC diagnostic ignored "-Wunused-function" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 44 | #pragma GCC diagnostic push |
| Jonathan Austin |
1:8aa5cdb4ab67 | 45 | #pragma GCC diagnostic ignored "-Wunused-parameter" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 46 | #endif |
| Jonathan Austin |
1:8aa5cdb4ab67 | 47 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 48 | #include "nrf_soc.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 49 | #include "nrf_sdm.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 50 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 51 | /* |
| Jonathan Austin |
1:8aa5cdb4ab67 | 52 | * Return to our predefined compiler settings. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 53 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 54 | #if !defined(__arm) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 55 | #pragma GCC diagnostic pop |
| Jonathan Austin |
1:8aa5cdb4ab67 | 56 | #endif |
| Jonathan Austin |
1:8aa5cdb4ab67 | 57 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 58 | static char friendly_name[MICROBIT_NAME_LENGTH+1]; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 59 | static const uint8_t panicFace[5] = {0x1B, 0x1B,0x0,0x0E,0x11}; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 60 | static int panic_timeout = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 61 | static uint32_t random_value = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 62 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 63 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 64 | * Determines if a BLE stack is currently running. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 65 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 66 | * @return true is a bluetooth stack is operational, false otherwise. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 67 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 68 | bool ble_running() |
| Jonathan Austin |
1:8aa5cdb4ab67 | 69 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 70 | uint8_t t; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 71 | sd_softdevice_is_enabled(&t); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 72 | return t==1; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 73 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 74 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 75 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 76 | * Derived a unique, consistent serial number of this device from internal data. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 77 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 78 | * @return the serial number of this device. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 79 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 80 | uint32_t microbit_serial_number() |
| Jonathan Austin |
1:8aa5cdb4ab67 | 81 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 82 | return NRF_FICR->DEVICEID[1]; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 83 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 84 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 85 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 86 | * Derive the friendly name for this device, based on its serial number. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 87 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 88 | * @return the serial number of this device. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 89 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 90 | char* microbit_friendly_name() |
| Jonathan Austin |
1:8aa5cdb4ab67 | 91 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 92 | const uint8_t codebook[MICROBIT_NAME_LENGTH][MICROBIT_NAME_CODE_LETTERS] = |
| Jonathan Austin |
1:8aa5cdb4ab67 | 93 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 94 | {'z', 'v', 'g', 'p', 't'}, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 95 | {'u', 'o', 'i', 'e', 'a'}, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 96 | {'z', 'v', 'g', 'p', 't'}, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 97 | {'u', 'o', 'i', 'e', 'a'}, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 98 | {'z', 'v', 'g', 'p', 't'} |
| Jonathan Austin |
1:8aa5cdb4ab67 | 99 | }; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 100 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 101 | // We count right to left, so create a pointer to the end of the buffer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 102 | char *name = friendly_name; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 103 | name += MICROBIT_NAME_LENGTH; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 104 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 105 | // Terminate the string. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 106 | *name = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 107 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 108 | // Derive our name from the nrf51822's unique ID. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 109 | uint32_t n = microbit_serial_number(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 110 | int ld = 1; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 111 | int d = MICROBIT_NAME_CODE_LETTERS; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 112 | int h; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 113 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 114 | for (int i=0; i<MICROBIT_NAME_LENGTH; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 115 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 116 | h = (n % d) / ld; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 117 | n -= h; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 118 | d *= MICROBIT_NAME_CODE_LETTERS; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 119 | ld *= MICROBIT_NAME_CODE_LETTERS; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 120 | *--name = codebook[i][h]; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 121 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 122 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 123 | return friendly_name; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 124 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 125 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 126 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 127 | * Perform a hard reset of the micro:bit. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 128 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 129 | void |
| Jonathan Austin |
1:8aa5cdb4ab67 | 130 | microbit_reset() |
| Jonathan Austin |
1:8aa5cdb4ab67 | 131 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 132 | NVIC_SystemReset(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 133 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 134 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 135 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 136 | * Determine the version of microbit-dal currently running. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 137 | * @return a pointer to a character buffer containing a representation of the semantic version number. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 138 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 139 | const char * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 140 | microbit_dal_version() |
| Jonathan Austin |
1:8aa5cdb4ab67 | 141 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 142 | return MICROBIT_DAL_VERSION; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 143 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 144 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 145 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 146 | * Defines the length of time that the device will remain in a error state before resetting. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 147 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 148 | * @param iteration The number of times the error code will be displayed before resetting. Set to zero to remain in error state forever. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 149 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 150 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 151 | * microbit_panic_timeout(4); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 152 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 153 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 154 | void microbit_panic_timeout(int iterations) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 155 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 156 | panic_timeout = iterations; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 157 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 158 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 159 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 160 | * Disables all interrupts and user processing. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 161 | * Displays "=(" and an accompanying status code on the default display. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 162 | * @param statusCode the appropriate status code - 0 means no code will be displayed. Status codes must be in the range 0-255. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 163 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 164 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 165 | * microbit_panic(20); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 166 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 167 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 168 | void microbit_panic(int statusCode) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 169 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 170 | DigitalIn resetButton(MICROBIT_PIN_BUTTON_RESET); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 171 | resetButton.mode(PullUp); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 172 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 173 | uint32_t row_mask = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 174 | uint32_t col_mask = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 175 | uint32_t row_reset = 0x01 << microbitMatrixMap.rowStart; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 176 | uint32_t row_data = row_reset; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 177 | uint8_t count = panic_timeout ? panic_timeout : 1; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 178 | uint8_t strobeRow = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 179 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 180 | row_mask = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 181 | for (int i = microbitMatrixMap.rowStart; i < microbitMatrixMap.rowStart + microbitMatrixMap.rows; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 182 | row_mask |= 0x01 << i; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 183 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 184 | for (int i = microbitMatrixMap.columnStart; i < microbitMatrixMap.columnStart + microbitMatrixMap.columns; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 185 | col_mask |= 0x01 << i; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 186 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 187 | PortOut LEDMatrix(Port0, row_mask | col_mask); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 188 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 189 | if(statusCode < 0 || statusCode > 255) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 190 | statusCode = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 191 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 192 | __disable_irq(); //stop ALL interrupts |
| Jonathan Austin |
1:8aa5cdb4ab67 | 193 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 194 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 195 | //point to the font stored in Flash |
| Jonathan Austin |
1:8aa5cdb4ab67 | 196 | const unsigned char * fontLocation = MicroBitFont::defaultFont; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 197 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 198 | //get individual digits of status code, and place it into a single array/ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 199 | const uint8_t* chars[MICROBIT_PANIC_ERROR_CHARS] = { panicFace, fontLocation+((((statusCode/100 % 10)+48)-MICROBIT_FONT_ASCII_START) * 5), fontLocation+((((statusCode/10 % 10)+48)-MICROBIT_FONT_ASCII_START) * 5), fontLocation+((((statusCode % 10)+48)-MICROBIT_FONT_ASCII_START) * 5)}; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 200 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 201 | //enter infinite loop. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 202 | while(count) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 203 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 204 | //iterate through our chars :) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 205 | for(int characterCount = 0; characterCount < MICROBIT_PANIC_ERROR_CHARS; characterCount++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 206 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 207 | int outerCount = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 208 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 209 | //display the current character |
| Jonathan Austin |
1:8aa5cdb4ab67 | 210 | while(outerCount < 500) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 211 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 212 | uint32_t col_data = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 213 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 214 | int i = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 215 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 216 | //if we have hit the row limit - reset both the bit mask and the row variable |
| Jonathan Austin |
1:8aa5cdb4ab67 | 217 | if(strobeRow == microbitMatrixMap.rows) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 218 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 219 | strobeRow = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 220 | row_data = row_reset; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 221 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 222 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 223 | // Calculate the bitpattern to write. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 224 | for (i = 0; i < microbitMatrixMap.columns; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 225 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 226 | int index = (i * microbitMatrixMap.rows) + strobeRow; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 227 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 228 | int bitMsk = 0x10 >> microbitMatrixMap.map[index].x; //chars are right aligned but read left to right |
| Jonathan Austin |
1:8aa5cdb4ab67 | 229 | int y = microbitMatrixMap.map[index].y; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 230 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 231 | if(chars[characterCount][y] & bitMsk) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 232 | col_data |= (1 << i); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 233 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 234 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 235 | col_data = ~col_data << microbitMatrixMap.columnStart & col_mask; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 236 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 237 | LEDMatrix = col_data | row_data; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 238 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 239 | //burn cycles |
| Jonathan Austin |
1:8aa5cdb4ab67 | 240 | i = 1000; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 241 | while(i>0) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 242 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 243 | // Check if the reset button has been pressed. Interrupts are disabled, so the normal method can't be relied upon... |
| Jonathan Austin |
1:8aa5cdb4ab67 | 244 | if (resetButton == 0) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 245 | microbit_reset(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 246 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 247 | i--; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 248 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 249 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 250 | //update the bit mask and row count |
| Jonathan Austin |
1:8aa5cdb4ab67 | 251 | row_data <<= 1; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 252 | strobeRow++; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 253 | outerCount++; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 254 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 255 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 256 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 257 | if (panic_timeout) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 258 | count--; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 259 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 260 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 261 | microbit_reset(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 262 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 263 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 264 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 265 | * Generate a random number in the given range. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 266 | * We use a simple Galois LFSR random number generator here, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 267 | * as a Galois LFSR is sufficient for our applications, and much more lightweight |
| Jonathan Austin |
1:8aa5cdb4ab67 | 268 | * than the hardware random number generator built int the processor, which takes |
| Jonathan Austin |
1:8aa5cdb4ab67 | 269 | * a long time and uses a lot of energy. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 270 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 271 | * KIDS: You shouldn't use this is the real world to generte cryptographic keys though... |
| Jonathan Austin |
1:8aa5cdb4ab67 | 272 | * have a think why not. :-) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 273 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 274 | * @param max the upper range to generate a number for. This number cannot be negative. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 275 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 276 | * @return A random, natural number between 0 and the max-1. Or MICROBIT_INVALID_VALUE if max is <= 0. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 277 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 278 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 279 | * microbit_random(200); //a number between 0 and 199 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 280 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 281 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 282 | int microbit_random(int max) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 283 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 284 | uint32_t m, result; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 285 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 286 | if(max <= 0) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 287 | return MICROBIT_INVALID_PARAMETER; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 288 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 289 | // Our maximum return value is actually one less than passed |
| Jonathan Austin |
1:8aa5cdb4ab67 | 290 | max--; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 291 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 292 | do { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 293 | m = (uint32_t)max; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 294 | result = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 295 | do { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 296 | // Cycle the LFSR (Linear Feedback Shift Register). |
| Jonathan Austin |
1:8aa5cdb4ab67 | 297 | // We use an optimal sequence with a period of 2^32-1, as defined by Bruce Schneier here (a true legend in the field!), |
| Jonathan Austin |
1:8aa5cdb4ab67 | 298 | // For those interested, it's documented in his paper: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 299 | // "Pseudo-Random Sequence Generator for 32-Bit CPUs: A fast, machine-independent generator for 32-bit Microprocessors" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 300 | // https://www.schneier.com/paper-pseudorandom-sequence.html |
| Jonathan Austin |
1:8aa5cdb4ab67 | 301 | uint32_t rnd = random_value; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 302 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 303 | rnd = ((((rnd >> 31) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 304 | ^ (rnd >> 6) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 305 | ^ (rnd >> 4) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 306 | ^ (rnd >> 2) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 307 | ^ (rnd >> 1) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 308 | ^ rnd) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 309 | & 0x0000001) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 310 | << 31 ) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 311 | | (rnd >> 1); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 312 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 313 | random_value = rnd; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 314 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 315 | result = ((result << 1) | (rnd & 0x00000001)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 316 | } while(m >>= 1); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 317 | } while (result > (uint32_t)max); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 318 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 319 | return result; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 320 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 321 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 322 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 323 | * Seed the random number generator (RNG). |
| Jonathan Austin |
1:8aa5cdb4ab67 | 324 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 325 | * This function uses the NRF51822's in built cryptographic random number generator to seed a Galois LFSR. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 326 | * We do this as the hardware RNG is relatively high power, and is locked out by the BLE stack internally, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 327 | * with a less than optimal application interface. A Galois LFSR is sufficient for our |
| Jonathan Austin |
1:8aa5cdb4ab67 | 328 | * applications, and much more lightweight. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 329 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 330 | void microbit_seed_random() |
| Jonathan Austin |
1:8aa5cdb4ab67 | 331 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 332 | random_value = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 333 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 334 | if(ble_running()) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 335 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 336 | // If Bluetooth is enabled, we need to go through the Nordic software to safely do this. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 337 | uint32_t result = sd_rand_application_vector_get((uint8_t*)&random_value, sizeof(random_value)); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 338 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 339 | // If we couldn't get the random bytes then at least make the seed non-zero. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 340 | if (result != NRF_SUCCESS) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 341 | random_value = 0xBBC5EED; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 342 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 343 | else |
| Jonathan Austin |
1:8aa5cdb4ab67 | 344 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 345 | // Othwerwise we can access the hardware RNG directly. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 346 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 347 | // Start the Random number generator. No need to leave it running... I hope. :-) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 348 | NRF_RNG->TASKS_START = 1; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 349 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 350 | for(int i = 0; i < 4; i++) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 351 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 352 | // Clear the VALRDY EVENT |
| Jonathan Austin |
1:8aa5cdb4ab67 | 353 | NRF_RNG->EVENTS_VALRDY = 0; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 354 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 355 | // Wait for a number ot be generated. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 356 | while(NRF_RNG->EVENTS_VALRDY == 0); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 357 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 358 | random_value = (random_value << 8) | ((int) NRF_RNG->VALUE); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 359 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 360 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 361 | // Disable the generator to save power. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 362 | NRF_RNG->TASKS_STOP = 1; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 363 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 364 | } |
| Jonathan Austin |
1:8aa5cdb4ab67 | 365 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 366 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 367 | * Seed the pseudo random number generator (RNG) using the given 32-bit value. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 368 | * This function does not use the NRF51822's in built cryptographic random number generator. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 369 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 370 | * @param seed The value to use as a seed. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 371 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 372 | void microbit_seed_random(uint32_t seed) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 373 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 374 | random_value = seed; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 375 | } |