Psi Swarm robot library version 0.9
Fork of PsiSwarmV9 by
colour.cpp
- Committer:
- jah128
- Date:
- 2017-06-01
- Revision:
- 15:66be5ec52c3b
- Parent:
- 14:2f1ad77d281e
- Child:
- 16:50686c07ad07
File content as of revision 15:66be5ec52c3b:
/* University of York Robotics Laboratory PsiSwarm Library: Colour Sensors Source File * * Copyright 2017 University of York * * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and limitations under the License. * * File: colour.cpp * * (C) Dept. Electronics & Computer Science, University of York * James Hilder, Alan Millard, Alexander Horsfield, Homero Elizondo, Jon Timmis * * PsiSwarm Library Version: 0.9 * * June 2017 * */ // Base colour sensor is a TCS34725 // Top colour sensor (if fitted) is a TCS34721 #include "psiswarm.h" int CS_C_BLACK = 63; int CS_C_WHITE = 802; int CS_R_BLACK = 22; int CS_R_WHITE = 244; int CS_G_BLACK = 24; int CS_G_WHITE = 297; int CS_B_BLACK = 16; int CS_B_WHITE = 232; int last_detected_colour = -1; void Colour::read_base_colour_sensor_values(int * store_array) { char buffer[8] = { 0 }; IF_readMultipleRegisters( CDATA, buffer, 8 ); store_array[0] = (int)buffer[1] << 8 | (int)buffer[0]; store_array[1] = (int)buffer[3] << 8 | (int)buffer[2]; store_array[2] = (int)buffer[5] << 8 | (int)buffer[4]; store_array[3] = (int)buffer[7] << 8 | (int)buffer[6]; } void Colour::set_base_colour_sensor_gain(char gain) { char control; int ack = 0; switch (gain) { case 1: control = 0; break; case 4: control = 1; break; case 16: control = 2; break; case 60: control = 3; break; default: ack = 2; // 2 used to indicate invalid entry break; } if ( ack != 2 ) { ack = IF_writeSingleRegister( CONTROL, control ); } } void Colour::set_base_colour_sensor_integration_time(char int_time) { char atime = 256 - IF_roundTowardsZero( int_time / 2.4 ); // rounding ensures nearest value of atime is used int ack = IF_writeSingleRegister( ATIME, atime ); } float Colour::IF_roundTowardsZero( const float value ) { float result = 0; if ( ( value >= 0 && ( value - (int)value ) < 0.5 ) || ( value < 0 && ( abs(value) - (int)abs(value) ) >= 0.5 ) ) { result = floor(value); } else { result = ceil(value); } return result; } void Colour::enable_base_colour_sensor(void) { char enable_old = IF_readSingleRegister( ENABLE ); char enable_new = enable_old | 3; // sets PON (bit 0) and AEN (bit 1) to 1 int ack = IF_writeSingleRegister( ENABLE, enable_new ); } void Colour::disable_base_colour_sensor(void) { char enable_old = IF_readSingleRegister( ENABLE ); char enable_new = enable_old & 252; // sets PON (bit 0) and AEN (bit 1) to 0 int ack = IF_writeSingleRegister( ENABLE, enable_new ); } Timeout colour_ticker; int colour_ticker_period; int colour_ticker_on = 0; void Colour::start_colour_ticker(int period_ms) { colour_ticker_on = 1; colour_ticker_period = period_ms; colour_ticker.attach_us(this,&Colour::IF_colour_ticker_start, 100); } void Colour::IF_colour_ticker_start() { led.set_base_led(1); enable_base_colour_sensor(); colour_ticker.attach_us(this,&Colour::IF_colour_ticker_main, 25000); } void Colour::IF_colour_ticker_main() { int rgb_readings [4]; read_base_colour_sensor_values( rgb_readings ); disable_base_colour_sensor(); led.set_base_led(0); if(rgb_readings[1] > 0 && rgb_readings[1] < 1024 && rgb_readings[2] > 0 && rgb_readings[2] < 1024 && rgb_readings[3] > 0 && rgb_readings[3] < 1024) { float adjusted[4]; get_calibrated_colour(rgb_readings,adjusted); last_detected_colour = identify_colour_from_calibrated_colour_scores(adjusted); } if(colour_ticker_on == 1)colour_ticker.attach_us(this,&Colour::IF_colour_ticker_start, colour_ticker_period * 1000); } int Colour::detect_colour_once() { int rgb_readings [4]; led.set_base_led(1); enable_base_colour_sensor(); wait(0.03); read_base_colour_sensor_values( rgb_readings ); disable_base_colour_sensor(); led.set_base_led(0); if(rgb_readings[1] < 1 || rgb_readings[1] > 1022 || rgb_readings[2] < 1 || rgb_readings[2] > 1022 || rgb_readings[3] < 1 || rgb_readings[3] > 1022) return -1; float adjusted[4]; get_calibrated_colour(rgb_readings,adjusted); last_detected_colour = identify_colour_from_calibrated_colour_scores(adjusted); return last_detected_colour; } int Colour::get_detected_colour() { return last_detected_colour; } const char * Colour::get_colour_string(int colour_index) { switch(colour_index) { case 0: return "RED "; case 1: return "YELLOW "; case 2: return "GREEN "; case 3: return "CYAN "; case 4: return "BLUE "; case 5: return "MAGENTA"; case 6: return "WHITE "; case 7: return "BLACK "; } return "-------"; } void Colour::get_calibrated_colour(int * colour_array_in, float * colour_array_out) { int colour_temp = colour_array_in[0]; if(colour_temp < CS_C_BLACK) colour_temp = CS_C_BLACK; if(colour_temp > CS_C_WHITE) colour_temp = CS_C_WHITE; colour_array_out[0] = (colour_temp - CS_C_BLACK) / (float) (CS_C_WHITE - CS_C_BLACK); float black_level = 1.0 - colour_array_out[0]; colour_array_out[1] = ((colour_array_in[1] / (float)CS_R_WHITE) * colour_array_out[0]) + ((colour_array_in[1] / (float)CS_R_BLACK) * black_level); colour_array_out[2] = ((colour_array_in[2] / (float)CS_G_WHITE) * colour_array_out[0]) + ((colour_array_in[2] / (float)CS_G_BLACK) * black_level); colour_array_out[3] = ((colour_array_in[3] / (float)CS_B_WHITE) * colour_array_out[0]) + ((colour_array_in[3] / (float)CS_B_BLACK) * black_level); // Normalise array float norm_factor = 3.0/(colour_array_out[1] + colour_array_out[2] + colour_array_out[3]); colour_array_out[1] *= norm_factor; colour_array_out[2] *= norm_factor; colour_array_out[3] *= norm_factor; // int sum_black = CS_R_BLACK + CS_G_BLACK + CS_ // colour_array_out[1] = } int Colour::identify_colour_from_calibrated_colour_scores(float * calibrate_colour_array_in) { float scores[8]; scores[0] = ((calibrate_colour_array_in[1] * 2) * (calibrate_colour_array_in[1] * 2)) / ((calibrate_colour_array_in[2] + calibrate_colour_array_in[3]) * (calibrate_colour_array_in[2] + calibrate_colour_array_in[3])); scores[1] = ((calibrate_colour_array_in[1] + calibrate_colour_array_in[2]) * (calibrate_colour_array_in[1] + calibrate_colour_array_in[2])) / (calibrate_colour_array_in[3] * calibrate_colour_array_in[3] * 4); scores[2] = ((calibrate_colour_array_in[2] * 2) * (calibrate_colour_array_in[2] * 2)) / ((calibrate_colour_array_in[1] + calibrate_colour_array_in[3]) * (calibrate_colour_array_in[1] + calibrate_colour_array_in[3])); scores[3] = ((calibrate_colour_array_in[2] + calibrate_colour_array_in[3]) * (calibrate_colour_array_in[2] + calibrate_colour_array_in[3])) / (calibrate_colour_array_in[1] * calibrate_colour_array_in[1] * 4); scores[4] = ((calibrate_colour_array_in[3] * 2) * (calibrate_colour_array_in[3] * 2)) / ((calibrate_colour_array_in[2] + calibrate_colour_array_in[1]) * (calibrate_colour_array_in[2] + calibrate_colour_array_in[1])); scores[5] = ((calibrate_colour_array_in[3] + calibrate_colour_array_in[1]) * (calibrate_colour_array_in[3] + calibrate_colour_array_in[1])) / (calibrate_colour_array_in[2] * calibrate_colour_array_in[2] * 4); float grey_factor = 1.0 / (1 + ((((calibrate_colour_array_in[1] - 1) * 10) * ((calibrate_colour_array_in[1] - 1) * 10)) * (((calibrate_colour_array_in[2] - 1) * 10) * ((calibrate_colour_array_in[2] - 1) * 10)) * (((calibrate_colour_array_in[3] - 1) * 10) * ((calibrate_colour_array_in[3] - 1) * 10)))); scores[6] = calibrate_colour_array_in[0] * calibrate_colour_array_in[0] * grey_factor * 4; scores[7] = (1-calibrate_colour_array_in[0]) * (1-calibrate_colour_array_in[0]) * grey_factor * 4; //pc.printf("R:%1.2f Y:%1.2f G:%1.2f C:%1.2f B:%1.2f M:%1.2f W:%1.2f B:%1.2f G:%1.2f\n\n", scores[0],scores[1],scores[2],scores[3],scores[4],scores[5],scores[6],scores[7],grey_factor); float max = 2; int max_index = 8; for(int i=0; i<8; i++) { if(scores[i] > max) { max=scores[i]; max_index=i; } } return max_index; } char Colour::IF_check_base_colour_sensor(void) { //Reads the device ID flag of the colour sensor [0xB2] //This should equal 0x44 for both TCS34721 (top) and TCS34725 (base) sensors //Return a 1 if successful or a 0 otherwise char return_value = 0; char data[1] = {0x00}; char command[1] = {0xB2}; primary_i2c.write(BASE_COLOUR_ADDRESS, command, 1, false); primary_i2c.read(BASE_COLOUR_ADDRESS, data, 1, false); if(data[0] == 0x44) return_value = 1; else psi.debug("Invalid response from colour sensor:%X\n",data[0]); return return_value; } int Colour::IF_writeSingleRegister( char address, char data ) { char tx[2] = { address | 160, data }; //0d160 = 0b10100000 int ack = primary_i2c.write(BASE_COLOUR_ADDRESS, tx, 2, false); return ack; } int Colour::IF_writeMultipleRegisters( char address, char* data, int quantity ) { char tx[ quantity + 1 ]; tx[0] = address | 160; for ( int i = 1; i <= quantity; i++ ) { tx[ i ] = data[ i - 1 ]; } int ack = primary_i2c.write(BASE_COLOUR_ADDRESS, tx, quantity + 1, false); return ack; } char Colour::IF_readSingleRegister( char address ) { char output = 255; char command = address | 160; //0d160 = 0b10100000 primary_i2c.write( BASE_COLOUR_ADDRESS, &command, 1, true ); primary_i2c.read( BASE_COLOUR_ADDRESS, &output, 1 ); return output; } int Colour::IF_readMultipleRegisters( char address, char* output, int quantity ) { char command = address | 160; //0d160 = 0b10100000 primary_i2c.write(BASE_COLOUR_ADDRESS, &command, 1, true ); int ack = primary_i2c.read( BASE_COLOUR_ADDRESS, output, quantity ); return ack; }