mirror of
https://github.com/JeffersGlass/DDS_VFO.git
synced 2024-11-27 02:37:37 -06:00
116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
/* Simple calibration routine for the Si5351 breakout board.
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*
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* Copyright 2015 Paul Warren <pwarren@pwarren.id.au>
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*
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* Uses code from https://github.com/darksidelemm/open_radio_miniconf_2015
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* and the old version of the calibration sketch
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*
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* This sketch is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* Foobar is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "si5351.h"
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#include "Wire.h"
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Si5351 si5351;
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int32_t cal_factor;
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int32_t old_cal;
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uint64_t rx_freq;
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uint64_t target_freq = 1000000000ULL; // 10 MHz, in hundredths of hertz
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void setup()
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{
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// Start serial and initialize the Si5351
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Serial.begin(57600);
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si5351.init(SI5351_CRYSTAL_LOAD_8PF, 0);
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// get old cal factor
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//old_cal = si5351.get_correction();
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si5351.set_correction(0);
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// start on target frequency
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si5351.set_pll(SI5351_PLL_FIXED, SI5351_PLLA);
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si5351.set_freq(target_freq, SI5351_PLL_FIXED, SI5351_CLK0);
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}
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void loop()
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{
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si5351.update_status();
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if (si5351.dev_status.SYS_INIT == 1) {
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Serial.println("Initialising Si5351, you shouldn't see many of these!");
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delay(500);
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} else {
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cal_factor = 0;
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// Serial.print("Old cal factor was: ");
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// Serial.println(old_cal);
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// Serial.println("Cal factor now set to 0");
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// si5351.set_correction(0);
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Serial.println();
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Serial.println(F("Adjust until your frequency counter reads as close to 10 MHz as possible"));
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vfo_interface();
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Serial.print(F("Calibration factor is "));
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Serial.println(cal_factor);
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Serial.println("Setting calibration factor");
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si5351.set_correction(cal_factor);
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Serial.println("Resetting target frequency");
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si5351.set_freq(target_freq, SI5351_PLL_FIXED, SI5351_CLK0);
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}
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}
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static void flush_input(void)
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{
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while (Serial.available() > 0)
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Serial.read();
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}
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static void vfo_interface(void)
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{
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rx_freq = target_freq;
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Serial.println(F(" Up: r t y u i o p"));
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Serial.println(F(" Down: f g h j k l ;"));
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Serial.println(F(" Hz: 0.01 0.1 1 10 100 1K 10k"));
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while (1) {
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if (Serial.available() > 0) {
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char c = Serial.read();
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switch (c) {
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case 'q':
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flush_input();
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return;
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case 'r': rx_freq += 1; break;
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case 'f': rx_freq -= 1; break;
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case 't': rx_freq += 10; break;
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case 'g': rx_freq -= 10; break;
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case 'y': rx_freq += 100; break;
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case 'h': rx_freq -= 100; break;
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case 'u': rx_freq += 1000; break;
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case 'j': rx_freq -= 1000; break;
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case 'i': rx_freq += 10000; break;
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case 'k': rx_freq -= 10000; break;
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case 'o': rx_freq += 100000; break;
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case 'l': rx_freq -= 100000; break;
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case 'p': rx_freq += 1000000; break;
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case ';': rx_freq -= 1000000; break;
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default:
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// Do nothing
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continue;
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}
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si5351.set_freq(rx_freq,SI5351_PLL_FIXED,SI5351_CLK0);
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cal_factor = (int32_t)(target_freq - rx_freq);
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Serial.print("Current difference:");
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Serial.println(cal_factor);
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}
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}
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}
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