diff options
| author | krolyxon <me@krolyxon.com> | 2026-06-08 23:10:46 +0530 |
|---|---|---|
| committer | krolyxon <me@krolyxon.com> | 2026-06-08 23:10:46 +0530 |
| commit | 3120783000d0025b183b0397acaa8b769499eb38 (patch) | |
| tree | 1c4f93be213f1b1d48f59e554562d847b4e7c25e /.pio/libdeps/esp32-s3-n16r8/RF24/examples/scannerGraphic | |
Initial gh-pages firmware hosting
Diffstat (limited to '.pio/libdeps/esp32-s3-n16r8/RF24/examples/scannerGraphic')
| -rw-r--r-- | .pio/libdeps/esp32-s3-n16r8/RF24/examples/scannerGraphic/scannerGraphic.ino | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/.pio/libdeps/esp32-s3-n16r8/RF24/examples/scannerGraphic/scannerGraphic.ino b/.pio/libdeps/esp32-s3-n16r8/RF24/examples/scannerGraphic/scannerGraphic.ino new file mode 100644 index 0000000..ddbed5a --- /dev/null +++ b/.pio/libdeps/esp32-s3-n16r8/RF24/examples/scannerGraphic/scannerGraphic.ino @@ -0,0 +1,323 @@ +/* + * Copyright (C) 2022 Brendan Doherty <2bndy5@gmail.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + */ + +/* + * This example uses 1 of 2 different popular displays. To control which display to use, + * comment/uncomment the lines below that define + * - `SPI_DISPLAY`: This requires the "Adafruit ST7735 and ST7789 Library" installed + * - `I2C_DISPLAY`: This requires the "Adafruit SSD1306" library installed + * + * Use the Arduino Library manager to ensure the required libraries are installed. + * By default, this sketch uses the SPI_DISPLAY (ST7789). Using both displays at the same + * time is not supported by this sketch. + * + * NOTES: + * The `SCREEN_HEIGHT` and `SCREEN_WIDTH` defines may need to be adjusted according + * to your display module's capability. This example expects the display to be at + * least 128 pixels wide. Otherwise, you would have to reduce the `numChannels` + * constant to fit within your display's width. + * + * The SPI_DISPLAY uses its own pins defined by `TFT_CS`, `TFT_DC`, and the + * optional `TFT_RST` (see below). The SPI bus is shared between radio and display, + * so the display's CS pin must be connected as specified by `TFT_CS`. + * If your ST7789 display does not have a CS pin, then further modification must + * be made so it does not use the same SPI bus that the radio uses. + * + * `DEBUGGING` can be enabled (uncommented) to show Serial output. This is just a + * convenience to set radio data rate or further development. See our other + * RF24/scanner example that only uses the Serial Monitor instead of a graphic + * display. + * + * See documentation at https://nRF24.github.io/RF24 + */ +#include <Adafruit_GFX.h> // dependency of Adafruit display libraries +#include "RF24.h" + +/******************************************************************** + * CHOOSE A DISPLAY INTERFACE + * uncomment/comment only 1 of the following to use the desired display + ********************************************************************/ +// #define I2C_DISPLAY // using the SSD1306 +#define SPI_DISPLAY // using ST7789 + +/******************************************************************** + * Choose a sketch feature + * uncomment any of the following to enable a special feature + ********************************************************************/ +// #define DEBUGGING // uncomment to enable Serial output (optional) +// #define HOLD_PEAKS // uncomment to disable decay of maxPeak pixels (useful for assessing total noise) + +/******************************************************************** + * Instantiate the radio and app-specific attributes + ********************************************************************/ + +#define CE_PIN 7 +#define CSN_PIN 8 +// instantiate an object for the nRF24L01 transceiver +RF24 radio(CE_PIN, CSN_PIN); + +// To detect noise, we'll use the worst addresses possible (a reverse engineering tactic). +// These addresses are designed to confuse the radio into thinking +// that the RF signal's preamble is part of the packet/payload. +const uint8_t noiseAddress[][2] = { { 0x55, 0x55 }, { 0xAA, 0xAA }, { 0xA0, 0xAA }, { 0xAB, 0xAA }, { 0xAC, 0xAA }, { 0xAD, 0xAA } }; + +const uint8_t numChannels = 126; // 0-125 are supported + +/*********************************************************************** + * Declare caching mechanism to track history of signals for peak decay + **********************************************************************/ + +const uint8_t cacheMax = 4; + +/// A data structure to organize the cache of signals for a certain channel. +struct ChannelHistory { + /// max peak value is (at most) 2 * CACHE_MAX to allow for half-step decays + uint8_t maxPeak = 0; + + /// Push a signal's value into cached history while popping + /// oldest cached value. This also sets the maxPeak value. + /// @returns The sum of signals found in the cached history + uint8_t push(bool value) { + uint8_t sum = value; + for (uint8_t i = 0; i < cacheMax - 1; ++i) { + history[i] = history[i + 1]; + sum += history[i]; + } + history[cacheMax - 1] = value; + maxPeak = max((uint8_t)(sum * 2), maxPeak); // sum * 2 to allow half-step decay + return sum; + } + +private: + bool history[cacheMax] = { 0 }; +}; + +/// An array of caches to use as channels' history +ChannelHistory stored[numChannels]; + +/******************************************************************** + * Instantiate the appropriate display objects according to the + * defines (above near top of file) + ********************************************************************/ + +#ifdef I2C_DISPLAY + +#include <Wire.h> +#include <Adafruit_SSD1306.h> + +#define SCREEN_WIDTH 128 // OLED display width, in pixels +#define SCREEN_HEIGHT 64 // OLED display height, in pixels + +// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins) +// The pins for I2C are defined by the Wire-library. +// On an arduino UNO: A4(SDA), A5(SCL) +// On an arduino MEGA 2560: 20(SDA), 21(SCL) +// On an arduino LEONARDO: 2(SDA), 3(SCL), ... +#define OLED_RESET -1 // Or set to -1 and connect to Arduino RESET pin +#define SCREEN_ADDRESS 0x3D // See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32 +Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); + +#define BLACK SSD1306_BLACK +#define WHITE SSD1306_WHITE +#define REFRESH ({ display.display(); }) +#define CLEAR_DISPLAY ({ display.clearDisplay(); }) + +#elif defined(SPI_DISPLAY) + +#include <Adafruit_ST7789.h> // Hardware-specific library for ST7789 + +#define TFT_CS 9 +#define TFT_RST -1 // Or set to -1 and connect to Arduino RESET pin +#define TFT_DC 6 + +#define SCREEN_WIDTH 135 // TFT display width, in pixels +#define SCREEN_HEIGHT 240 // TFT display height, in pixels + +// For 1.14", 1.3", 1.54", 1.69", and 2.0" TFT with ST7789: +Adafruit_ST7789 display = Adafruit_ST7789(TFT_CS, TFT_DC, TFT_RST); + +#define BLACK ST77XX_BLACK +#define WHITE ST77XX_WHITE +#define REFRESH +#define CLEAR_DISPLAY ({ display.fillScreen(BLACK); }) + +#endif // if defined(I2C_DISPLAY) || defined(SPI_DISPLAY) + +// constant chart size attributes +const uint16_t margin = 1; // use 1 pixel margin for markers on each side of chart +const uint16_t barWidth = (SCREEN_WIDTH - (margin * 2)) / numChannels; +const uint16_t chartHeight = SCREEN_HEIGHT - 10; +const uint16_t chartWidth = margin * 2 + (numChannels * barWidth); + +/******************************************************************** + * Configure debugging on Serial output + ********************************************************************/ + +#ifdef DEBUGGING +#include "printf.h" +#define SERIAL_DEBUG(x) ({ x; }) +#else +#define SERIAL_DEBUG(x) +#endif + +/******************************************************************** + * Setup the app + ********************************************************************/ +void setup(void) { + +#ifdef DEBUGGING + // Print preamble + Serial.begin(115200); + while (!Serial) { + // some boards need this to wait for Serial connection + } + Serial.println(F("RF24/examples/scannerGraphic")); +#endif + +#ifdef I2C_DISPLAY + // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally + if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) { + SERIAL_DEBUG(Serial.println(F("SSD1306 allocation failed"));); + while (true) { + // Don't proceed, loop forever + } + } +#elif defined(SPI_DISPLAY) + // use this initializer for a 1.14" 240x135 TFT: + display.init(SCREEN_WIDTH, SCREEN_HEIGHT); // Init ST7789 240x135 +#endif + + // Clear the buffer + CLEAR_DISPLAY; + + // Setup and configure rf radio + if (!radio.begin()) { + SERIAL_DEBUG(Serial.println(F("radio hardware not responding!"));); + display.setCursor(1, 1); + display.setTextColor(WHITE); + display.print(F("radio hardware\nnot responding!")); + REFRESH; + while (true) { + // hold in an infinite loop + } + } + displayChartAxis(); + + radio.setAutoAck(false); // Don't acknowledge arbitrary signals + radio.disableCRC(); // accept any signal we find + radio.setAddressWidth(2); // a reverse engineering tactic (not typically recommended) + for (uint8_t i = 0; i < 6; ++i) { + radio.openReadingPipe(i, noiseAddress[i]); + } + + // set the data rate +#ifdef DEBUGGING + unsigned long inputTimeout = millis() + 7000; + Serial.print(F("Select your Data Rate. ")); + Serial.println(F("Enter '1' for 1Mbps, '2' for 2Mbps, '3' for 250kbps. Defaults to 1 Mbps.")); + while (!Serial.available() && millis() < inputTimeout) { + // Wait for user input. Timeout after 7 seconds. + } + char dataRate = !Serial.available() ? '1' : Serial.parseInt(); +#else + char dataRate = '1'; +#endif + if (dataRate == '2') { + SERIAL_DEBUG(Serial.println(F("Using 2 Mbps."));); + radio.setDataRate(RF24_2MBPS); + } else if (dataRate == '3') { + SERIAL_DEBUG(Serial.println(F("Using 250 kbps."));); + radio.setDataRate(RF24_250KBPS); + } else { // dataRate == '1' or invalid values + SERIAL_DEBUG(Serial.println(F("Using 1 Mbps."));); + radio.setDataRate(RF24_1MBPS); + } + + // Get into standby mode + radio.startListening(); + radio.stopListening(); + radio.flush_rx(); +} + +/******************************************************************** + * Make the app loop forever + ********************************************************************/ +void loop(void) { + // Print out channel measurements, clamped to a single hex digit + for (uint8_t channel = 0; channel < numChannels; ++channel) { + bool foundSignal = scanChannel(channel); + uint8_t cacheSum = stored[channel].push(foundSignal); + uint8_t x = (barWidth * channel) + 1 + margin - (barWidth * (bool)channel); + // reset bar for current channel to 0 + display.fillRect(x, 0, barWidth, chartHeight, BLACK); + if (stored[channel].maxPeak > cacheSum * 2) { + // draw a peak line only if it is greater than current sum of cached signal counts + uint16_t y = chartHeight - (chartHeight * stored[channel].maxPeak / (cacheMax * 2)); + display.drawLine(x, y, x + barWidth, y, WHITE); +#ifndef HOLD_PEAKS + stored[channel].maxPeak -= 1; // decrement max peak +#endif + } + if (cacheSum) { // draw the cached signal count + uint8_t barHeight = chartHeight * cacheSum / cacheMax; + display.fillRect(x, chartHeight - barHeight, barWidth, barHeight, WHITE); + } + } + REFRESH; +} // end loop() + +/// Scan a specified channel and return the resulting flag +bool scanChannel(uint8_t channel) { + radio.setChannel(channel); + + // Listen for a little + radio.startListening(); + delayMicroseconds(130); + bool foundSignal = radio.testRPD(); + radio.stopListening(); + + // Did we get a signal? + if (foundSignal || radio.testRPD() || radio.available()) { + radio.flush_rx(); // discard packets of noise + return true; + } + return false; +} + +/// Draw the chart axis and labels +void displayChartAxis() { + // draw base line + display.drawLine(0, chartHeight + 1, chartWidth - margin, chartHeight + 1, WHITE); + + // draw base line border + display.drawLine(margin, SCREEN_HEIGHT, margin, chartHeight - 2, WHITE); + display.drawLine(chartWidth - margin, SCREEN_HEIGHT, chartWidth - margin, chartHeight - 2, WHITE); + + // draw scalar marks + for (uint8_t i = 0; i < cacheMax; ++i) { + uint8_t scalarHeight = chartHeight * i / cacheMax; + display.drawLine(0, scalarHeight, chartWidth, scalarHeight, WHITE); + } + + // draw channel range labels + display.setTextSize(1); + display.setTextColor(WHITE); + uint8_t maxChannelDigits = 0; + uint8_t tmp = numChannels; + while (tmp) { + maxChannelDigits += 1; + tmp /= 10; + } + display.setCursor(chartWidth - (7 * maxChannelDigits), chartHeight + 3); + display.print(numChannels - 1); + display.setCursor(margin + 2, chartHeight + 3); + display.print(0); + + // refresh display + REFRESH; +} |
