MF Doom / SI1141_auto_sense

set up to autonomously sample with one sensor

Fork of SI1142 by Dave Cohen

SI1143.cpp@9:31d4e955ee92, 2014-05-23 (annotated)

Committer:
dmcohen24
Date:
Fri May 23 21:34:54 2014 +0000
Revision:
9:31d4e955ee92
Parent:
8:70933bf445af
Child:
10:a89555c4f62a
autonomous sensing

Who changed what in which revision?

UserRevisionLine numberNew contents of line
GAT27 2:21381f11a5af 1 /**
GAT27 2:21381f11a5af 2 * @author Guillermo A Torijano
GAT27 2:21381f11a5af 3 *
GAT27 2:21381f11a5af 4 * @section LICENSE
GAT27 2:21381f11a5af 5 *
GAT27 2:21381f11a5af 6 * Permission is hereby granted, free of charge, to any person obtaining a copy
GAT27 2:21381f11a5af 7 * of this software and associated documentation files (the "Software"), to deal
GAT27 2:21381f11a5af 8 * in the Software without restriction, including without limitation the rights
GAT27 2:21381f11a5af 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
GAT27 2:21381f11a5af 10 * copies of the Software, and to permit persons to whom the Software is
GAT27 2:21381f11a5af 11 * furnished to do so, subject to the following conditions:
GAT27 2:21381f11a5af 12 *
GAT27 2:21381f11a5af 13 * The above copyright notice and this permission notice shall be included in
GAT27 2:21381f11a5af 14 * all copies or substantial portions of the Software.
GAT27 2:21381f11a5af 15 *
GAT27 2:21381f11a5af 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
GAT27 2:21381f11a5af 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
GAT27 2:21381f11a5af 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
GAT27 2:21381f11a5af 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
GAT27 2:21381f11a5af 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
GAT27 2:21381f11a5af 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
GAT27 2:21381f11a5af 22 * THE SOFTWARE.
GAT27 2:21381f11a5af 23 *
GAT27 2:21381f11a5af 24 * @section DESCRIPTION
GAT27 2:21381f11a5af 25 *
GAT27 2:21381f11a5af 26 * Parallax SI1143 Gesture Sensor.
GAT27 2:21381f11a5af 27 *
GAT27 2:21381f11a5af 28 * Datasheet:
GAT27 2:21381f11a5af 29 *
GAT27 2:21381f11a5af 30 * http://www.silabs.com/Support%20Documents/TechnicalDocs/Si114x.pdf
GAT27 2:21381f11a5af 31 */
GAT27 2:21381f11a5af 32
GAT27 0:18ebb7348150 33 #include "SI1143.h"
GAT27 0:18ebb7348150 34
GAT27 0:18ebb7348150 35 SI1143::SI1143(PinName sda, PinName scl)
GAT27 0:18ebb7348150 36 {
GAT27 0:18ebb7348150 37 wait_ms(30);
GAT27 0:18ebb7348150 38 i2c_ = new I2C(sda, scl);
GAT27 5:3fadc61598bc 39 // 3.4MHz, as specified by the datasheet, but DO NOT USE.
GAT27 1:28beeb2f209b 40 //i2c_->frequency(3400000);
GAT27 0:18ebb7348150 41
GAT27 4:af8f820733e0 42 restart();
GAT27 4:af8f820733e0 43 }
GAT27 4:af8f820733e0 44
GAT27 4:af8f820733e0 45 void SI1143::restart()
GAT27 4:af8f820733e0 46 {
GAT27 0:18ebb7348150 47 command(RESET);
GAT27 0:18ebb7348150 48 wait_ms(30);
GAT27 0:18ebb7348150 49
dmcohen24 8:70933bf445af 50 //Do this because you have to
GAT27 5:3fadc61598bc 51 write_reg(HW_KEY,HW_KEY_VAL0);
dmcohen24 8:70933bf445af 52
dmcohen24 8:70933bf445af 53 // Setting up LED Power to FULL JUICE
dmcohen24 7:f1303b85db58 54 write_reg(PS_LED21,0x0F); // Was 0x0A
dmcohen24 7:f1303b85db58 55 write_reg(PS_LED3,0x00);
dmcohen24 7:f1303b85db58 56 //write_reg(PS_LED21,0xAA);
dmcohen24 7:f1303b85db58 57 //write_reg(PS_LED3,0x0A);
dmcohen24 8:70933bf445af 58
dmcohen24 8:70933bf445af 59 //Activate ALS_IR, ALS_VIS, and PS1
dmcohen24 7:f1303b85db58 60 write_reg(PARAM_WR, ALS_IR_TASK + ALS_VIS_TASK + PS1_TASK);
dmcohen24 8:70933bf445af 61 //write_reg(PARAM_WR, ALS_IR_TASK + ALS_VIS_TASK + PS1_TASK + PS2_TASK + PS3_TASK);
dmcohen24 8:70933bf445af 62 command(PARAM_SET + (CHLIST & 0x1F));
GAT27 0:18ebb7348150 63
dmcohen24 8:70933bf445af 64 /*
dmcohen24 8:70933bf445af 65 // Set PS_RANGE to high signal range
dmcohen24 8:70933bf445af 66 write_reg(PARAM_WR, 0x04); // 0x24 for high signal, 0x04 for normal
dmcohen24 8:70933bf445af 67 command(PARAM_SET + (PS_ADC_MISC & 0x1F));
dmcohen24 8:70933bf445af 68 */
dmcohen24 8:70933bf445af 69 //Set PS_ADC_COUNTER to lower time between ADC samples
dmcohen24 8:70933bf445af 70 write_reg(PARAM_WR, 0x00);
dmcohen24 8:70933bf445af 71 command(PARAM_SET + (PS_ADC_COUNTER & 0x1F));
dmcohen24 8:70933bf445af 72
dmcohen24 8:70933bf445af 73 //Turn up the juice on PS ACD GAIN!
dmcohen24 9:31d4e955ee92 74 write_reg(PARAM_WR, 0x00);
dmcohen24 8:70933bf445af 75 command(PARAM_SET + (PS_ADC_GAIN & 0x1F));
dmcohen24 8:70933bf445af 76
GAT27 0:18ebb7348150 77
dmcohen24 9:31d4e955ee92 78 write_reg(INT_CFG,0x01); // Configure Interrupts
dmcohen24 9:31d4e955ee92 79 write_reg(IRQ_ENABLE,0x04); // Enable PS1
GAT27 0:18ebb7348150 80 write_reg(IRQ_MODE1,0);
GAT27 0:18ebb7348150 81 write_reg(IRQ_MODE2,0);
dmcohen24 7:f1303b85db58 82
dmcohen24 9:31d4e955ee92 83 write_reg(MEAS_RATE,0x94); //0x84 - wakes up every 10 ms
dmcohen24 9:31d4e955ee92 84 write_reg(PS_RATE,0x08); //0x84 - wakes up every time measurement clock wakes up
dmcohen24 9:31d4e955ee92 85
dmcohen24 7:f1303b85db58 86 //write_reg(PS_ADC_MISC,0x24);
dmcohen24 7:f1303b85db58 87 //write_reg(PS1_ADCMUX,0x03);
GAT27 0:18ebb7348150 88 }
GAT27 0:18ebb7348150 89
GAT27 0:18ebb7348150 90 void SI1143::command(char cmd)
GAT27 0:18ebb7348150 91 {
GAT27 0:18ebb7348150 92 int val;
GAT27 0:18ebb7348150 93
GAT27 0:18ebb7348150 94 val = read_reg(RESPONSE,1);
GAT27 0:18ebb7348150 95 while(val!=0)
GAT27 0:18ebb7348150 96 {
GAT27 0:18ebb7348150 97 write_reg(COMMAND,NOP);
GAT27 0:18ebb7348150 98 val = read_reg(RESPONSE,1);
GAT27 0:18ebb7348150 99 }
GAT27 0:18ebb7348150 100 do{
GAT27 0:18ebb7348150 101 write_reg(COMMAND,cmd);
GAT27 0:18ebb7348150 102 if(cmd==RESET) break;
GAT27 0:18ebb7348150 103 val = read_reg(RESPONSE,1);
GAT27 0:18ebb7348150 104 }while(val==0);
GAT27 0:18ebb7348150 105 }
GAT27 0:18ebb7348150 106
GAT27 1:28beeb2f209b 107 char SI1143::read_reg(/*unsigned*/ char address, int num_data) // Read a register
GAT27 0:18ebb7348150 108 {
GAT27 0:18ebb7348150 109 char tx[1];
GAT27 0:18ebb7348150 110 char rx[1];
GAT27 0:18ebb7348150 111
GAT27 1:28beeb2f209b 112 //i2c_->start();
GAT27 0:18ebb7348150 113 tx[0] = address;
GAT27 0:18ebb7348150 114 i2c_->write((IR_ADDRESS << 1) & 0xFE, tx, num_data);
GAT27 0:18ebb7348150 115 wait_ms(1);
GAT27 1:28beeb2f209b 116 //i2c_->stop();
GAT27 0:18ebb7348150 117
GAT27 1:28beeb2f209b 118 //i2c_->start();
GAT27 0:18ebb7348150 119 i2c_->read((IR_ADDRESS << 1) | 0x01, rx, num_data);
GAT27 0:18ebb7348150 120 wait_ms(1);
GAT27 1:28beeb2f209b 121 //i2c_->stop();
GAT27 0:18ebb7348150 122
GAT27 0:18ebb7348150 123 return rx[0];
GAT27 0:18ebb7348150 124 }
GAT27 0:18ebb7348150 125
GAT27 1:28beeb2f209b 126 void SI1143::write_reg(char address, char num_data) // Write a resigter
GAT27 1:28beeb2f209b 127 {
GAT27 0:18ebb7348150 128 char tx[2];
GAT27 5:3fadc61598bc 129
GAT27 5:3fadc61598bc 130 //i2c_->start();
GAT27 0:18ebb7348150 131 tx[0] = address;
GAT27 0:18ebb7348150 132 tx[1] = num_data;
GAT27 0:18ebb7348150 133 i2c_->write((IR_ADDRESS << 1) & 0xFE, tx, 2);
GAT27 0:18ebb7348150 134 wait_ms(1);
GAT27 1:28beeb2f209b 135 //i2c_->stop();
GAT27 0:18ebb7348150 136 }
GAT27 0:18ebb7348150 137
GAT27 5:3fadc61598bc 138 void SI1143::bias(int ready, int repeat)
GAT27 0:18ebb7348150 139 {
GAT27 5:3fadc61598bc 140 wait(ready);
dmcohen24 8:70933bf445af 141 //bias1 = get_ps1(repeat);
dmcohen24 8:70933bf445af 142 bias1 = 0;
GAT27 5:3fadc61598bc 143 bias2 = get_ps2(repeat);
GAT27 5:3fadc61598bc 144 bias3 = get_ps3(repeat);
GAT27 0:18ebb7348150 145 }
GAT27 0:18ebb7348150 146
dmcohen24 9:31d4e955ee92 147 int SI1143::get_ps1(int repeat) // Read the data for the first LED (Used in forced mode)
GAT27 0:18ebb7348150 148 {
GAT27 5:3fadc61598bc 149 int stack = 0;
GAT27 5:3fadc61598bc 150
GAT27 0:18ebb7348150 151 command(PSALS_FORCE);
GAT27 0:18ebb7348150 152
GAT27 5:3fadc61598bc 153 for(int r=repeat; r>0; r=r-1)
GAT27 5:3fadc61598bc 154 {
GAT27 5:3fadc61598bc 155 LowB = read_reg(PS1_DATA0,1);
GAT27 5:3fadc61598bc 156 HighB = read_reg(PS1_DATA1,1);
GAT27 5:3fadc61598bc 157 stack = stack + (HighB * 256) + LowB;
GAT27 5:3fadc61598bc 158 }
GAT27 5:3fadc61598bc 159 PS1 = stack / repeat;
GAT27 0:18ebb7348150 160
GAT27 0:18ebb7348150 161 if(PS1 > bias1)
GAT27 0:18ebb7348150 162 PS1 = PS1 - bias1;
GAT27 0:18ebb7348150 163 else
GAT27 0:18ebb7348150 164 PS1 = 0;
GAT27 5:3fadc61598bc 165
GAT27 5:3fadc61598bc 166 return PS1;
GAT27 5:3fadc61598bc 167 }
GAT27 5:3fadc61598bc 168
dmcohen24 9:31d4e955ee92 169 void SI1143::start_ps_auto()
dmcohen24 9:31d4e955ee92 170 {
dmcohen24 9:31d4e955ee92 171 command(PS_AUTO);
dmcohen24 9:31d4e955ee92 172 }
dmcohen24 9:31d4e955ee92 173
dmcohen24 9:31d4e955ee92 174 int SI1143::read_ps1() // Read the data for the first LED (Used in autonomous mode)
dmcohen24 9:31d4e955ee92 175 {
dmcohen24 9:31d4e955ee92 176
dmcohen24 9:31d4e955ee92 177
dmcohen24 9:31d4e955ee92 178 LowB = read_reg(PS1_DATA0,1);
dmcohen24 9:31d4e955ee92 179 HighB = read_reg(PS1_DATA1,1);
dmcohen24 9:31d4e955ee92 180 PS1 = (HighB * 256) + LowB;
dmcohen24 9:31d4e955ee92 181
dmcohen24 9:31d4e955ee92 182 if(PS1 > bias1)
dmcohen24 9:31d4e955ee92 183 PS1 = PS1 - bias1;
dmcohen24 9:31d4e955ee92 184 else
dmcohen24 9:31d4e955ee92 185 PS1 = 0;
dmcohen24 9:31d4e955ee92 186
dmcohen24 9:31d4e955ee92 187 return PS1;
dmcohen24 9:31d4e955ee92 188 }
dmcohen24 9:31d4e955ee92 189
GAT27 5:3fadc61598bc 190 int SI1143::get_ps2(int repeat) // Read the data for the second LED
GAT27 5:3fadc61598bc 191 {
GAT27 5:3fadc61598bc 192 int stack = 0;
GAT27 5:3fadc61598bc 193
GAT27 5:3fadc61598bc 194 command(PSALS_FORCE);
GAT27 5:3fadc61598bc 195
GAT27 5:3fadc61598bc 196 for(int r=repeat; r>0; r=r-1)
GAT27 5:3fadc61598bc 197 {
GAT27 5:3fadc61598bc 198 LowB = read_reg(PS2_DATA0,1);
GAT27 5:3fadc61598bc 199 HighB = read_reg(PS2_DATA1,1);
GAT27 5:3fadc61598bc 200 stack = stack + (HighB * 256) + LowB;
GAT27 5:3fadc61598bc 201 }
GAT27 5:3fadc61598bc 202 PS2 = stack / repeat;
GAT27 5:3fadc61598bc 203
GAT27 0:18ebb7348150 204 if(PS2 > bias2)
GAT27 0:18ebb7348150 205 PS2 = PS2 - bias2;
GAT27 0:18ebb7348150 206 else
GAT27 0:18ebb7348150 207 PS2 = 0;
GAT27 5:3fadc61598bc 208
GAT27 5:3fadc61598bc 209 return PS2;
GAT27 5:3fadc61598bc 210 }
GAT27 5:3fadc61598bc 211
GAT27 5:3fadc61598bc 212 int SI1143::get_ps3(int repeat) // Read the data for the third LED
GAT27 5:3fadc61598bc 213 {
GAT27 5:3fadc61598bc 214 int stack = 0;
GAT27 5:3fadc61598bc 215
GAT27 5:3fadc61598bc 216 command(PSALS_FORCE);
GAT27 5:3fadc61598bc 217
GAT27 5:3fadc61598bc 218 for(int r=repeat; r>0; r=r-1)
GAT27 5:3fadc61598bc 219 {
GAT27 5:3fadc61598bc 220 LowB = read_reg(PS3_DATA0,1);
GAT27 5:3fadc61598bc 221 HighB = read_reg(PS3_DATA1,1);
GAT27 5:3fadc61598bc 222 stack = stack + (HighB * 256) + LowB;
GAT27 5:3fadc61598bc 223 }
GAT27 5:3fadc61598bc 224 PS3 = stack / repeat;
GAT27 5:3fadc61598bc 225
GAT27 0:18ebb7348150 226 if(PS3 > bias3)
GAT27 0:18ebb7348150 227 PS3 = PS3 - bias3;
GAT27 0:18ebb7348150 228 else
GAT27 0:18ebb7348150 229 PS3 = 0;
GAT27 0:18ebb7348150 230
GAT27 5:3fadc61598bc 231 return PS3;
GAT27 0:18ebb7348150 232 }
GAT27 2:21381f11a5af 233
GAT27 5:3fadc61598bc 234 int SI1143::get_vis(int repeat) // Read the data for ambient light
GAT27 5:3fadc61598bc 235 {
GAT27 5:3fadc61598bc 236 int stack = 0;
GAT27 5:3fadc61598bc 237
GAT27 5:3fadc61598bc 238 command(PSALS_FORCE);
GAT27 5:3fadc61598bc 239
GAT27 5:3fadc61598bc 240 for(int r=repeat; r>0; r=r-1)
GAT27 5:3fadc61598bc 241 {
GAT27 5:3fadc61598bc 242 LowB = read_reg(ALS_VIS_DATA0,1);
GAT27 5:3fadc61598bc 243 HighB = read_reg(ALS_VIS_DATA1,1);
GAT27 5:3fadc61598bc 244 VIS = stack + (HighB * 256) + LowB;
GAT27 5:3fadc61598bc 245 }
GAT27 5:3fadc61598bc 246 VIS = stack / repeat;
GAT27 5:3fadc61598bc 247
GAT27 5:3fadc61598bc 248 return VIS;
GAT27 5:3fadc61598bc 249 }
GAT27 4:af8f820733e0 250
GAT27 5:3fadc61598bc 251 int SI1143::get_ir(int repeat) // Read the data for infrared light
GAT27 5:3fadc61598bc 252 {
GAT27 5:3fadc61598bc 253 int stack = 0;
GAT27 5:3fadc61598bc 254
GAT27 5:3fadc61598bc 255 command(PSALS_FORCE);
GAT27 5:3fadc61598bc 256
GAT27 5:3fadc61598bc 257 for(int r=repeat; r>0; r=r-1)
GAT27 5:3fadc61598bc 258 {
GAT27 5:3fadc61598bc 259 LowB = read_reg(ALS_IR_DATA0,1);
GAT27 5:3fadc61598bc 260 HighB = read_reg(ALS_IR_DATA1,1);
GAT27 5:3fadc61598bc 261 IR = stack + (HighB * 256) + LowB;
GAT27 5:3fadc61598bc 262 }
GAT27 5:3fadc61598bc 263 IR = stack / repeat;
GAT27 5:3fadc61598bc 264
GAT27 5:3fadc61598bc 265 return IR;
GAT27 5:3fadc61598bc 266 }
dmcohen24 9:31d4e955ee92 267
dmcohen24 9:31d4e955ee92 268 void SI1143::clear_int() // Clear Interrupt register when an interrupt occurs.
dmcohen24 9:31d4e955ee92 269 {
dmcohen24 9:31d4e955ee92 270 write_reg(IRQ_STATUS, 0x3F); // Writes one to every interrupt status, thereby clearing them
dmcohen24 9:31d4e955ee92 271 }