7 Segment LED Displaydriver, I2C interface, SAA1064
SAA1064.cpp@2:970360b29a2a, 2013-09-23 (annotated)
- Committer:
- wim
- Date:
- Mon Sep 23 19:23:34 2013 +0000
- Revision:
- 2:970360b29a2a
- Parent:
- 1:79cb73f852da
Documentation updated
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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wim | 0:48adc4a70511 | 1 | /* SAA1064 - I2C LED Driver used in multiplex mode (4x 7 Segments and Decimal Point) |
wim | 0:48adc4a70511 | 2 | * Copyright (c) 2013 Wim Huiskamp |
wim | 0:48adc4a70511 | 3 | * |
wim | 0:48adc4a70511 | 4 | * Released under the MIT License: http://mbed.org/license/mit |
wim | 0:48adc4a70511 | 5 | * |
wim | 0:48adc4a70511 | 6 | * version 0.2 Initial Release |
wim | 2:970360b29a2a | 7 | * version 0.3 Improved Leading Zero suppress for writeInt |
wim | 0:48adc4a70511 | 8 | */ |
wim | 0:48adc4a70511 | 9 | #include "mbed.h" |
wim | 0:48adc4a70511 | 10 | #include "SAA1064.h" |
wim | 0:48adc4a70511 | 11 | |
wim | 1:79cb73f852da | 12 | |
wim | 1:79cb73f852da | 13 | /** Create a SAA1064 LED displaydriver object using a specified I2C bus and slaveaddress |
wim | 1:79cb73f852da | 14 | * |
wim | 1:79cb73f852da | 15 | * @param I2C &i2c the I2C port to connect to |
wim | 1:79cb73f852da | 16 | * @param char deviceAddress the address of the SAA1064 |
wim | 1:79cb73f852da | 17 | */ |
wim | 1:79cb73f852da | 18 | SAA1064::SAA1064(I2C *i2c, uint8_t deviceAddress) : _i2c(i2c) { |
wim | 0:48adc4a70511 | 19 | |
wim | 0:48adc4a70511 | 20 | _slaveAddress = deviceAddress; |
wim | 0:48adc4a70511 | 21 | _init(); |
wim | 0:48adc4a70511 | 22 | }; |
wim | 0:48adc4a70511 | 23 | |
wim | 1:79cb73f852da | 24 | /** Set segment brightness |
wim | 1:79cb73f852da | 25 | * |
wim | 1:79cb73f852da | 26 | * @param intensity intensity value, valid Range between 0-7, 0 = 0 mA/segment, 1 = 3 mA/segment etc |
wim | 1:79cb73f852da | 27 | */ |
wim | 1:79cb73f852da | 28 | void SAA1064::setIntensity(uint8_t intensity) { |
wim | 1:79cb73f852da | 29 | uint8_t data[6]; |
wim | 0:48adc4a70511 | 30 | |
wim | 0:48adc4a70511 | 31 | intensity = (intensity & 0x07) << 4; // Valid Range between 0-7 |
wim | 0:48adc4a70511 | 32 | // 0 = 0 mA/segment, 1 = 3 mA/segment etc |
wim | 0:48adc4a70511 | 33 | data[0] = SAA1064_CTRL; // Select Control Reg |
wim | 0:48adc4a70511 | 34 | data[1] = SAA1064_CTRL_DEF | intensity; // Init Control Reg |
wim | 0:48adc4a70511 | 35 | |
wim | 0:48adc4a70511 | 36 | // write data to the display |
wim | 1:79cb73f852da | 37 | _i2c->write(_slaveAddress, (char*) data, 2); |
wim | 0:48adc4a70511 | 38 | |
wim | 0:48adc4a70511 | 39 | }; |
wim | 0:48adc4a70511 | 40 | |
wim | 0:48adc4a70511 | 41 | |
wim | 1:79cb73f852da | 42 | /** Write digits |
wim | 1:79cb73f852da | 43 | * |
wim | 1:79cb73f852da | 44 | * @param digit1 LED segment pattern for digit1 (MSB) |
wim | 1:79cb73f852da | 45 | * @param digit2 LED segment pattern for digit2 |
wim | 1:79cb73f852da | 46 | * @param digit3 LED segment pattern for digit3 |
wim | 1:79cb73f852da | 47 | * @param digit4 LED segment pattern for digit4 (LSB) |
wim | 1:79cb73f852da | 48 | */ |
wim | 1:79cb73f852da | 49 | void SAA1064::write(uint8_t digit1, uint8_t digit2, uint8_t digit3, uint8_t digit4) { |
wim | 1:79cb73f852da | 50 | uint8_t data[6]; |
wim | 0:48adc4a70511 | 51 | |
wim | 0:48adc4a70511 | 52 | data[0] = SAA1064_DIG1; // Select Digit1 Reg |
wim | 0:48adc4a70511 | 53 | data[1] = digit1; // Digit 1 |
wim | 0:48adc4a70511 | 54 | data[2] = digit2; // Digit 2 |
wim | 0:48adc4a70511 | 55 | data[3] = digit3; // Digit 3 |
wim | 0:48adc4a70511 | 56 | data[4] = digit4; // Digit 4 |
wim | 0:48adc4a70511 | 57 | |
wim | 0:48adc4a70511 | 58 | // write data to the display |
wim | 1:79cb73f852da | 59 | _i2c->write(_slaveAddress, (char*) data, 5); |
wim | 0:48adc4a70511 | 60 | |
wim | 0:48adc4a70511 | 61 | }; |
wim | 0:48adc4a70511 | 62 | |
wim | 1:79cb73f852da | 63 | |
wim | 1:79cb73f852da | 64 | /** Write Integer |
wim | 1:79cb73f852da | 65 | * |
wim | 1:79cb73f852da | 66 | * @param value integer value to display, valid range -999...9999 |
wim | 1:79cb73f852da | 67 | * @param dp_digit digit where decimal point is set, valid range 1..4 (no DP shown for dp_digit = 0) |
wim | 1:79cb73f852da | 68 | * @param leading suppress leading zero (false=show leading zero, true=suppress leading zero) |
wim | 1:79cb73f852da | 69 | */ |
wim | 1:79cb73f852da | 70 | void SAA1064::writeInt(int value, uint8_t dp_digit, bool leading) { |
wim | 1:79cb73f852da | 71 | uint8_t digit_value; |
wim | 1:79cb73f852da | 72 | uint8_t data[6]; |
wim | 0:48adc4a70511 | 73 | |
wim | 0:48adc4a70511 | 74 | data[0] = SAA1064_DIG1; // Select Digit1 Reg |
wim | 0:48adc4a70511 | 75 | |
wim | 0:48adc4a70511 | 76 | // limit to valid range |
wim | 0:48adc4a70511 | 77 | if (value >= 9999) value = 9999; |
wim | 0:48adc4a70511 | 78 | if (value <= -999) value = -999; |
wim | 0:48adc4a70511 | 79 | |
wim | 0:48adc4a70511 | 80 | if (value >= 0) { |
wim | 0:48adc4a70511 | 81 | // value 0...9999 |
wim | 0:48adc4a70511 | 82 | digit_value = value/1000; // compute thousands |
wim | 0:48adc4a70511 | 83 | value = value % 1000; // compute remainder |
wim | 2:970360b29a2a | 84 | if ((digit_value==0) && !(dp_digit==1) && leading ) |
wim | 0:48adc4a70511 | 85 | data[1] = SAA1064_BLNK; // suppress leading zero |
wim | 0:48adc4a70511 | 86 | else { |
wim | 0:48adc4a70511 | 87 | data[1] = SAA1064_SEGM[digit_value]; |
wim | 0:48adc4a70511 | 88 | leading = false; // dont suppress zero's |
wim | 0:48adc4a70511 | 89 | } |
wim | 0:48adc4a70511 | 90 | if (dp_digit==1) {data[1] |= SAA1064_DP;} // Set decimal point |
wim | 0:48adc4a70511 | 91 | |
wim | 0:48adc4a70511 | 92 | |
wim | 0:48adc4a70511 | 93 | digit_value = value/100; // compute hundreds |
wim | 0:48adc4a70511 | 94 | value = value % 100; // compute remainder |
wim | 2:970360b29a2a | 95 | if ((digit_value==0) && !(dp_digit==2) && leading) |
wim | 0:48adc4a70511 | 96 | data[2] = SAA1064_BLNK; // suppress leading zero |
wim | 0:48adc4a70511 | 97 | else { |
wim | 0:48adc4a70511 | 98 | data[2] = SAA1064_SEGM[digit_value]; |
wim | 0:48adc4a70511 | 99 | leading = false; // dont suppress zero's |
wim | 0:48adc4a70511 | 100 | } |
wim | 0:48adc4a70511 | 101 | if (dp_digit==2) {data[2] |= SAA1064_DP;} // Set decimal point |
wim | 0:48adc4a70511 | 102 | |
wim | 0:48adc4a70511 | 103 | digit_value = value/10; // compute tens |
wim | 0:48adc4a70511 | 104 | value = value % 10; // compute remainder |
wim | 2:970360b29a2a | 105 | if ((digit_value==0) && !(dp_digit==3) && leading) |
wim | 0:48adc4a70511 | 106 | data[3] = SAA1064_BLNK; // suppress leading zero |
wim | 0:48adc4a70511 | 107 | else { |
wim | 0:48adc4a70511 | 108 | data[3] = SAA1064_SEGM[digit_value]; |
wim | 0:48adc4a70511 | 109 | //leading = false; // dont suppress zero's |
wim | 0:48adc4a70511 | 110 | } |
wim | 0:48adc4a70511 | 111 | if (dp_digit==3) {data[3] |= SAA1064_DP;} // Set decimal point |
wim | 0:48adc4a70511 | 112 | |
wim | 0:48adc4a70511 | 113 | //digit_value = value; // compute units |
wim | 0:48adc4a70511 | 114 | data[4] = SAA1064_SEGM[value]; // never suppress units zero |
wim | 0:48adc4a70511 | 115 | if (dp_digit==4) {data[4] |= SAA1064_DP;} // Set decimal point |
wim | 0:48adc4a70511 | 116 | |
wim | 0:48adc4a70511 | 117 | } |
wim | 0:48adc4a70511 | 118 | else { |
wim | 0:48adc4a70511 | 119 | // value -999...-1 |
wim | 0:48adc4a70511 | 120 | value = -value; |
wim | 0:48adc4a70511 | 121 | data[1] = SAA1064_MINUS; // Sign |
wim | 0:48adc4a70511 | 122 | if (dp_digit==1) {data[1] |= SAA1064_DP;} // Set decimal point |
wim | 0:48adc4a70511 | 123 | |
wim | 0:48adc4a70511 | 124 | digit_value = value/100; // compute hundreds |
wim | 0:48adc4a70511 | 125 | value = value % 100; // compute remainder |
wim | 2:970360b29a2a | 126 | if ((digit_value==0) && !(dp_digit==2) && leading) |
wim | 0:48adc4a70511 | 127 | data[2] = SAA1064_BLNK; // suppress leading zero |
wim | 0:48adc4a70511 | 128 | else { |
wim | 0:48adc4a70511 | 129 | data[2] = SAA1064_SEGM[digit_value]; |
wim | 0:48adc4a70511 | 130 | leading = false; // dont suppress zero's |
wim | 0:48adc4a70511 | 131 | } |
wim | 0:48adc4a70511 | 132 | if (dp_digit==2) {data[2] |= SAA1064_DP;} // Set decimal point |
wim | 0:48adc4a70511 | 133 | |
wim | 0:48adc4a70511 | 134 | digit_value = value/10; // compute tens |
wim | 0:48adc4a70511 | 135 | value = value % 10; // compute remainder |
wim | 2:970360b29a2a | 136 | if ((digit_value==0) && !(dp_digit==3) && leading) |
wim | 0:48adc4a70511 | 137 | data[3] = SAA1064_BLNK; // suppress leading zero |
wim | 0:48adc4a70511 | 138 | else { |
wim | 0:48adc4a70511 | 139 | data[3] = SAA1064_SEGM[digit_value]; |
wim | 0:48adc4a70511 | 140 | //leading = false; // dont suppress zero's |
wim | 0:48adc4a70511 | 141 | } |
wim | 0:48adc4a70511 | 142 | if (dp_digit==3) {data[3] |= SAA1064_DP;} // Set decimal point |
wim | 0:48adc4a70511 | 143 | |
wim | 0:48adc4a70511 | 144 | //digit_value = value; // compute units |
wim | 0:48adc4a70511 | 145 | data[4] = SAA1064_SEGM[value]; // never suppress units zero |
wim | 0:48adc4a70511 | 146 | if (dp_digit==4) {data[4] |= SAA1064_DP;} // Set decimal point |
wim | 0:48adc4a70511 | 147 | } |
wim | 0:48adc4a70511 | 148 | |
wim | 0:48adc4a70511 | 149 | // write data to the display |
wim | 1:79cb73f852da | 150 | _i2c->write(_slaveAddress, (char*) data, 5); |
wim | 0:48adc4a70511 | 151 | |
wim | 0:48adc4a70511 | 152 | }; |
wim | 0:48adc4a70511 | 153 | |
wim | 1:79cb73f852da | 154 | /** snake: show a short animation |
wim | 1:79cb73f852da | 155 | * |
wim | 1:79cb73f852da | 156 | * @param count number of times animation is repeated, valid range 0..15 |
wim | 1:79cb73f852da | 157 | * |
wim | 1:79cb73f852da | 158 | */ |
wim | 1:79cb73f852da | 159 | void SAA1064::snake(uint8_t count) { |
wim | 1:79cb73f852da | 160 | uint8_t i; |
wim | 1:79cb73f852da | 161 | const float step = 0.1; |
wim | 1:79cb73f852da | 162 | // const float loop = 0.1; |
wim | 1:79cb73f852da | 163 | |
wim | 1:79cb73f852da | 164 | count = count & 0x0F; // Limit max count |
wim | 1:79cb73f852da | 165 | |
wim | 1:79cb73f852da | 166 | for (i=0; i<count; i++) { |
wim | 1:79cb73f852da | 167 | write(0x00,0x00,0x00,0x01); wait(step); |
wim | 1:79cb73f852da | 168 | write(0x00,0x00,0x01,0x01); wait(step); |
wim | 1:79cb73f852da | 169 | write(0x00,0x01,0x01,0x01); wait(step); |
wim | 1:79cb73f852da | 170 | write(0x01,0x01,0x01,0x00); wait(step); |
wim | 1:79cb73f852da | 171 | write(0x21,0x01,0x00,0x00); wait(step); |
wim | 1:79cb73f852da | 172 | write(0x31,0x00,0x00,0x00); wait(step); |
wim | 1:79cb73f852da | 173 | write(0x38,0x00,0x00,0x00); wait(step); |
wim | 1:79cb73f852da | 174 | write(0x18,0x08,0x00,0x00); wait(step); |
wim | 1:79cb73f852da | 175 | write(0x08,0x08,0x08,0x00); wait(step); |
wim | 1:79cb73f852da | 176 | write(0x00,0x08,0x08,0x08); wait(step); |
wim | 1:79cb73f852da | 177 | write(0x00,0x00,0x08,0x0C); wait(step); |
wim | 1:79cb73f852da | 178 | write(0x00,0x00,0x00,0x0E); wait(step); |
wim | 1:79cb73f852da | 179 | write(0x00,0x00,0x00,0x06); wait(step); |
wim | 1:79cb73f852da | 180 | write(0x00,0x00,0x00,0x02); wait(step); |
wim | 1:79cb73f852da | 181 | write(0x00,0x00,0x00,0x00); wait(step); |
wim | 1:79cb73f852da | 182 | |
wim | 1:79cb73f852da | 183 | // wait(loop) |
wim | 1:79cb73f852da | 184 | } |
wim | 0:48adc4a70511 | 185 | |
wim | 1:79cb73f852da | 186 | } |
wim | 1:79cb73f852da | 187 | |
wim | 1:79cb73f852da | 188 | |
wim | 1:79cb73f852da | 189 | /** splash: show a short animation |
wim | 1:79cb73f852da | 190 | * |
wim | 1:79cb73f852da | 191 | * @param count number of times animation is repeated, valid range 0..15 |
wim | 1:79cb73f852da | 192 | * |
wim | 1:79cb73f852da | 193 | */ |
wim | 1:79cb73f852da | 194 | void SAA1064::splash (uint8_t count){ |
wim | 1:79cb73f852da | 195 | uint8_t i; |
wim | 1:79cb73f852da | 196 | const float step = 0.3; |
wim | 1:79cb73f852da | 197 | // const float loop = 0.1; |
wim | 1:79cb73f852da | 198 | |
wim | 1:79cb73f852da | 199 | count = count & 0x0F; // Limit max count |
wim | 1:79cb73f852da | 200 | |
wim | 1:79cb73f852da | 201 | for (i=0; i<count; i++) { |
wim | 1:79cb73f852da | 202 | write(0x00,0x40,0x40,0x00); wait(step); |
wim | 1:79cb73f852da | 203 | write(0x39,0x09,0x09,0x0F); wait(step); |
wim | 1:79cb73f852da | 204 | |
wim | 1:79cb73f852da | 205 | // wait(loop) |
wim | 1:79cb73f852da | 206 | } |
wim | 1:79cb73f852da | 207 | write(0x00,0x00,0x00,0x00); |
wim | 1:79cb73f852da | 208 | } |
wim | 1:79cb73f852da | 209 | |
wim | 1:79cb73f852da | 210 | |
wim | 1:79cb73f852da | 211 | /** Initialise LED driver |
wim | 1:79cb73f852da | 212 | * |
wim | 1:79cb73f852da | 213 | */ |
wim | 0:48adc4a70511 | 214 | void SAA1064::_init() { |
wim | 1:79cb73f852da | 215 | uint8_t data[6]; |
wim | 0:48adc4a70511 | 216 | |
wim | 0:48adc4a70511 | 217 | data[0] = SAA1064_CTRL; // Select Control Reg |
wim | 0:48adc4a70511 | 218 | data[1] = SAA1064_CTRL_DEF | SAA1064_INT3; // Init Control Reg |
wim | 0:48adc4a70511 | 219 | data[2] = SAA1064_BLNK; // Digit 1: All Segments Off |
wim | 0:48adc4a70511 | 220 | data[3] = SAA1064_BLNK; // Digit 2: All Segments Off |
wim | 0:48adc4a70511 | 221 | data[4] = SAA1064_BLNK; // Digit 3: All Segments Off |
wim | 0:48adc4a70511 | 222 | data[5] = SAA1064_BLNK; // Digit 4: All Segments Off |
wim | 0:48adc4a70511 | 223 | |
wim | 0:48adc4a70511 | 224 | // data[2] = SAA1064_ALL; // Digit 1: All Segments On |
wim | 0:48adc4a70511 | 225 | // data[3] = SAA1064_ALL; // Digit 2: All Segments On |
wim | 0:48adc4a70511 | 226 | // data[4] = SAA1064_ALL; // Digit 3: All Segments On |
wim | 0:48adc4a70511 | 227 | // data[5] = SAA1064_ALL; // Digit 4: All Segments On |
wim | 0:48adc4a70511 | 228 | |
wim | 0:48adc4a70511 | 229 | // write data to the display |
wim | 1:79cb73f852da | 230 | _i2c->write(_slaveAddress, (char*) data, 6); |
wim | 0:48adc4a70511 | 231 | |
wim | 0:48adc4a70511 | 232 | }; |