mayhem-firmware/firmware/application/apps/ui_whipcalc.cpp

/*
 * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
 * Copyright (C) 2016 Furrtek
 *
 * This file is part of PortaPack.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "ui_whipcalc.hpp"

#include "ch.h"
#include "portapack.hpp"
#include "event_m0.hpp"

#include <cstring>

using namespace portapack;

namespace ui {

void WhipCalcView::focus() {
	field_frequency.focus();
}

double ui::WhipCalcView::get_decimals(double num, int16_t mult, bool round) {
 	num -= int(num);				//keep decimals only
 	num *= mult;					//Shift decimals into integers
 	if (!round) return num;				
 	int16_t intnum = int(num);		//Round it up if necessary
 	num -= intnum;					//Get decimal part
 	if (num > .5) intnum++;			//Round up
 	return intnum;
 }

void WhipCalcView::update_result() {
	double length, calclength, divider;
	
	divider = ((double)options_type.selected_index_value() / 8.0);
	
	// Metric
	length = (speed_of_light_mps / (double)field_frequency.value()) * divider;
	
	auto m = to_string_dec_int((int)length, 2);
/* 	auto cm = to_string_dec_int(int(length * 100.0) % 100, 2);
	auto mm = to_string_dec_int(int(length * 1000.0) % 10, 1); */

 	calclength = get_decimals(length,100);				//cm
 	auto cm = to_string_dec_int(int(calclength), 2);
 	auto mm = to_string_dec_int(int(get_decimals(calclength,10,true)), 1);
	
	text_result_metric.set(m + "m " + cm + "." + mm + "cm");

	uint8_t ant_count = 8;	//Shown antennas counter
 	console.write("\f"); //Equivalent to clear console and string buffer.
  	length *= 1000;		//Get length in mm needed to extend the antenna
 	for (antenna_entry antenna : antenna_db) {	//go thru all antennas available
 		if (length >= antenna.elements.front() && length <= antenna.elements.back()) //This antenna is OK
 		{
 			uint16_t element,refined_quarter=0;
 			for(element=0; element < antenna.elements.size();element++) {
 				if (length == antenna.elements[element]) 			//Exact element in length
 				{	
 					element++;	//Real element is +1  (zero based vector)
 					break; 	//Done with this ant
 				} 
 				else if (length < antenna.elements[element]) 
 				{
 	 				double remain, this_element, quarter = 0;
 					remain = length - antenna.elements[element-1]; 	//mm needed from this element to reach length
 					this_element=antenna.elements[element] - antenna.elements[element -1];	//total mm on this element
 					quarter = (remain * 4) / this_element;	//havoc & portack ended on this int(quarter) resolution.
 					if (quarter - int(quarter) > 0.5) {	//rounding gave a measure closer to next quarter
 						refined_quarter=int(quarter) + 1;
 						if(refined_quarter == 4) {		//rounding gave a measure closer to next element
 							refined_quarter = 0;
 							element++;
 						}
 					} else {
 						refined_quarter=int(quarter);
 					}
 					break;	//Done with this ant
 				}
 			}
 			if (!ant_count) {
 				console.write(" and more ...");
 				break;
 			} 
 			console.write(antenna.label + " " + to_string_dec_int(element,1) + frac_str[refined_quarter] + " elements\n");
 			ant_count--;
 		}
 	}

	// Imperial
	calclength = (speed_of_light_fps / (double)field_frequency.value()) * divider;
	auto feet = to_string_dec_int(int(calclength), 3);
 	calclength = get_decimals(calclength,12);				//inches
 	auto inch = to_string_dec_int(int(calclength), 2);
 	auto inch_c = to_string_dec_int(int(get_decimals(calclength,10,true)), 1);
	
	text_result_imperial.set(feet + "ft " + inch + "." + inch_c + "in");
}

WhipCalcView::WhipCalcView(
	NavigationView& nav
) {

	add_children({
		&labels,
		&antennas_on_memory,
		&field_frequency,
		&options_type,
		&text_result_metric,
		&text_result_imperial,
		&console,
		&button_exit
	});

	File antennas_file; 		//LOAD /WHIPCALC/ANTENNAS.TXT from microSD
 	auto result = antennas_file.open("WHIPCALC/ANTENNAS.TXT");
 	antenna_db.clear();			//Start with fresh db
 	if (result.is_valid()) {
 		antenna_Default(); 		//There is no txt, store a default ant500
 	} else {
 		std::string line;		//There is a txt file
 		char one_char[1];		//Read it char by char
 		for (size_t pointer=0; pointer < antennas_file.size();pointer++) {
 			antennas_file.seek(pointer);
 			antennas_file.read(one_char, 1);
 			if ((int)one_char[0] > 31) {			//ascii space upwards
 				line += one_char[0];				//Add it to the textline
 			}
 			else if (one_char[0] == '\n') {			//New Line
 				txtline_process(line);				//make sense of this textline
 				line.clear();						//Ready for next textline
 			} 
 		}
 		if (line.length() > 0) txtline_process(line);	//Last line had no newline at end ?
 		if (!antenna_db.size()) antenna_Default();	//no antenna found on txt, use default
 	}
 	antennas_on_memory.set(to_string_dec_int(antenna_db.size(),2) + " antennas");	//tell user
	
	options_type.on_change = [this](size_t, OptionsField::value_t) {
		this->update_result();
	};
	options_type.set_selected_index(2);		// Quarter wave
	
	field_frequency.set_value(transmitter_model.tuning_frequency());
	field_frequency.set_step(500000);		// 500kHz step
	field_frequency.on_change = [this](rf::Frequency) {
		this->update_result();
	};
	field_frequency.on_edit = [this, &nav]() {
		// TODO: Provide separate modal method/scheme?
		auto new_view = nav.push<FrequencyKeypadView>(transmitter_model.tuning_frequency());
		new_view->on_changed = [this](rf::Frequency f) {
			this->update_result();
			this->field_frequency.set_value(f);
		};
	};
	
	button_exit.on_select = [this, &nav](Button&) {
		nav.pop();
	};
	
	update_result();
}

void ui::WhipCalcView::txtline_process(std::string& line) {
 	if (line.find("#") != std::string::npos) return;	//Line is just a comment
 	size_t previous = 0;
 	uint16_t value = 0;
 	antenna_entry new_antenna;
 	size_t current = line.find(" ");
 	while (current != std::string::npos) {
 		if (!previous) {								//first space found
 			new_antenna.label.assign(line,0,current);	//antenna label
 		} else {
 			value = std::stoi(line.substr(previous,current - previous));
 			if (!value) return; 						//No element length? abort antenna
 			new_antenna.elements.push_back(value);		//Store this new element
 		}
 		previous = current + 1;
 		current = line.find(" ",previous);				//Search for next space delimiter
 	}
 	if (!previous) return;								//Not even a label ? drop this antenna!
 	value = std::stoi(line.substr(previous,current - previous)); //Last element
 	if (!value) return;
 	new_antenna.elements.push_back(value);
 	antenna_db.push_back(new_antenna); 					//Add this antenna
}

 void ui::WhipCalcView::antenna_Default() {
 	antenna_db.push_back({"ANT500",{ 185, 315, 450, 586, 724, 862} }); //store a default ant500
}

}