examples for qt py ch32v203

adding examples for LED blink, i2c scan, neopixel rainbow swirl and hid keyboard for the QT Py CH32V203. also including compiled binaries

QT_Py_CH32_Examples/Blink_QTPyCH32/Blink_QTPyCH32.ino

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+// SPDX-FileCopyrightText: 2024 Ha Thach for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <Arduino.h>
+#include <Adafruit_TinyUSB.h> // required for USB Serial
+
+const int led = PA6;
+
+void setup () {
+  pinMode(led, OUTPUT);
+}
+
+void loop () {
+  Serial.println("LED on");
+  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
+  delay(1000);               // wait for a second
+  
+  Serial.println("LED off");
+  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
+  delay(1000);               // wait for a second
+}

QT_Py_CH32_Examples/HID_Keyboard_QTPyCH32/HID_Keyboard_QTPyCH32.ino

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+// SPDX-FileCopyrightText: 2024 Ha Thach for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+/*********************************************************************
+ Adafruit invests time and resources providing this open source code,
+ please support Adafruit and open-source hardware by purchasing
+ products from Adafruit!
+
+ MIT license, check LICENSE for more information
+ Copyright (c) 2019 Ha Thach for Adafruit Industries
+ All text above, and the splash screen below must be included in
+ any redistribution
+*********************************************************************/
+
+#include <Arduino.h>
+#include "Adafruit_TinyUSB.h"
+#include <Adafruit_NeoPixel.h>
+
+const int neopixel_pin = PA4;
+#define LED_COUNT 1
+Adafruit_NeoPixel pixels(LED_COUNT, neopixel_pin, NEO_GRB + NEO_KHZ800);
+
+//------------- Input Pins -------------//
+// Array of pins and its keycode.
+// Notes: these pins can be replaced by PIN_BUTTONn if defined in setup()
+
+uint8_t pins[] = {PB1, PB0, PA1, PA0}; //A0, A1, A2, A3
+
+// HID report descriptor using TinyUSB's template
+// Single Report (no ID) descriptor
+uint8_t const desc_hid_report[] = {
+    TUD_HID_REPORT_DESC_KEYBOARD()
+};
+
+// USB HID object. For ESP32 these values cannot be changed after this declaration
+// desc report, desc len, protocol, interval, use out endpoint
+Adafruit_USBD_HID usb_hid;
+
+
+// number of pins
+uint8_t pincount = sizeof(pins) / sizeof(pins[0]);
+
+// For keycode definition check out https://github.com/hathach/tinyusb/blob/master/src/class/hid/hid.h
+uint8_t hidcode[] = {HID_KEY_0, HID_KEY_1, HID_KEY_2, HID_KEY_3};
+
+bool activeState = false;
+
+// the setup function runs once when you press reset or power the board
+void setup() {
+  pixels.begin();
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
+
+  // Setup HID
+  usb_hid.setBootProtocol(HID_ITF_PROTOCOL_KEYBOARD);
+  usb_hid.setPollInterval(2);
+  usb_hid.setReportDescriptor(desc_hid_report, sizeof(desc_hid_report));
+  usb_hid.setStringDescriptor("TinyUSB Keyboard");
+
+  // Set up output report (on control endpoint) for Capslock indicator
+  usb_hid.setReportCallback(NULL, hid_report_callback);
+
+  usb_hid.begin();
+
+  // overwrite input pin with PIN_BUTTONx
+#ifdef PIN_BUTTON1
+  pins[0] = PIN_BUTTON1;
+#endif
+
+#ifdef PIN_BUTTON2
+  pins[1] = PIN_BUTTON2;
+#endif
+
+#ifdef PIN_BUTTON3
+  pins[2] = PIN_BUTTON3;
+#endif
+
+#ifdef PIN_BUTTON4
+  pins[3] = PIN_BUTTON4;
+#endif
+
+  // Set up pin as input
+  for (uint8_t i = 0; i < pincount; i++) {
+    pinMode(pins[i], activeState ? INPUT_PULLDOWN : INPUT_PULLUP);
+  }
+}
+
+void process_hid() {
+  // used to avoid send multiple consecutive zero report for keyboard
+  static bool keyPressedPreviously = false;
+
+  uint8_t count = 0;
+  uint8_t keycode[6] = {0};
+
+  // scan normal key and send report
+  for (uint8_t i = 0; i < pincount; i++) {
+    if (activeState == digitalRead(pins[i])) {
+      // if pin is active (low), add its hid code to key report
+      keycode[count++] = hidcode[i];
+
+      // 6 is max keycode per report
+      if (count == 6) break;
+    }
+  }
+
+  if (TinyUSBDevice.suspended() && count) {
+    // Wake up host if we are in suspend mode
+    // and REMOTE_WAKEUP feature is enabled by host
+    TinyUSBDevice.remoteWakeup();
+  }
+
+  // skip if hid is not ready e.g still transferring previous report
+  if (!usb_hid.ready()) return;
+
+  if (count) {
+    // Send report if there is key pressed
+    uint8_t const report_id = 0;
+    uint8_t const modifier = 0;
+
+    keyPressedPreviously = true;
+    usb_hid.keyboardReport(report_id, modifier, keycode);
+  } else {
+    // Send All-zero report to indicate there is no keys pressed
+    // Most of the time, it is, though we don't need to send zero report
+    // every loop(), only a key is pressed in previous loop()
+    if (keyPressedPreviously) {
+      keyPressedPreviously = false;
+      usb_hid.keyboardRelease(0);
+    }
+  }
+}
+
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // not enumerated()/mounted() yet: nothing to do
+  if (!TinyUSBDevice.mounted()) {
+    return;
+  }
+
+  // poll gpio once each 2 ms
+  static uint32_t ms = 0;
+  if (millis() - ms > 2) {
+    ms = millis();
+    process_hid();
+  }
+}
+
+void setLED(bool state) {
+  pixels.setPixelColor(0, pixels.Color(0, state ? 150 : 0, 0));
+  pixels.show();
+}
+
+// Output report callback for LED indicator such as Caplocks
+void hid_report_callback(uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize) {
+  (void) report_id;
+  (void) bufsize;
+
+  // LED indicator is output report with only 1 byte length
+  if (report_type != HID_REPORT_TYPE_OUTPUT) return;
+
+  // The LED bit map is as follows: (also defined by KEYBOARD_LED_* )
+  // Kana (4) | Compose (3) | ScrollLock (2) | CapsLock (1) | Numlock (0)
+  uint8_t ledIndicator = buffer[0];
+
+  // turn on LED if capslock is set
+  setLED(ledIndicator & KEYBOARD_LED_CAPSLOCK);
+}

QT_Py_CH32_Examples/I2C_Scan/I2C_Scan.ino

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+// SPDX-FileCopyrightText: 2023 Carter Nelson for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <Adafruit_TestBed.h>
+extern Adafruit_TestBed TB;
+
+#define DEFAULT_I2C_PORT &Wire
+
+// Some boards have TWO I2C ports, how nifty. We should scan both
+#if defined(ARDUINO_ARCH_RP2040) \
+    || defined(ARDUINO_ADAFRUIT_QTPY_ESP32S2) \
+    || defined(ARDUINO_ADAFRUIT_QTPY_ESP32S3_NOPSRAM) \
+    || defined(ARDUINO_ADAFRUIT_QTPY_ESP32S3) \
+    || defined(ARDUINO_ADAFRUIT_QTPY_ESP32_PICO) \
+    || defined(ARDUINO_SAM_DUE) \
+    || defined(ARDUINO_ARCH_RENESAS_UNO)
+  #define SECONDARY_I2C_PORT &Wire1
+#endif
+
+void setup() {
+  Serial.begin(115200);
+
+  // Wait for Serial port to open
+  while (!Serial) {
+    delay(10);
+  }
+  delay(500);
+  Serial.println("Adafruit I2C Scanner");
+
+#if defined(ARDUINO_ADAFRUIT_QTPY_ESP32S2) || \
+    defined(ARDUINO_ADAFRUIT_QTPY_ESP32S3_NOPSRAM) || \
+    defined(ARDUINO_ADAFRUIT_QTPY_ESP32S3) || \
+    defined(ARDUINO_ADAFRUIT_QTPY_ESP32_PICO)
+  // ESP32 is kinda odd in that secondary ports must be manually
+  // assigned their pins with setPins()!
+  Wire1.setPins(SDA1, SCL1);
+#endif
+
+#if defined(ARDUINO_ADAFRUIT_FEATHER_ESP32S2)
+  // turn on the I2C power by setting pin to opposite of 'rest state'
+  pinMode(PIN_I2C_POWER, INPUT);
+  delay(1);
+  bool polarity = digitalRead(PIN_I2C_POWER);
+  pinMode(PIN_I2C_POWER, OUTPUT);
+  digitalWrite(PIN_I2C_POWER, !polarity);
+#endif
+
+#if defined(ARDUINO_ADAFRUIT_FEATHER_ESP32S2_TFT)
+  pinMode(TFT_I2C_POWER, OUTPUT);
+  digitalWrite(TFT_I2C_POWER, HIGH);
+#endif
+
+#if defined(ARDUINO_ADAFRUIT_FEATHER_ESP32S2_REVTFT)
+  pinMode(TFT_I2C_POWER, OUTPUT);
+  digitalWrite(TFT_I2C_POWER, HIGH);
+#endif
+
+#if defined(ADAFRUIT_FEATHER_ESP32_V2)
+  // Turn on the I2C power by pulling pin HIGH.
+  pinMode(NEOPIXEL_I2C_POWER, OUTPUT);
+  digitalWrite(NEOPIXEL_I2C_POWER, HIGH);
+#endif
+}
+
+void loop() {
+  Serial.println("");
+  Serial.println("");
+
+  Serial.print("Default port (Wire) ");
+  TB.theWire = DEFAULT_I2C_PORT;
+  TB.printI2CBusScan();
+
+#if defined(SECONDARY_I2C_PORT)
+  Serial.print("Secondary port (Wire1) ");
+  TB.theWire = SECONDARY_I2C_PORT;
+  TB.printI2CBusScan();
+#endif
+
+  delay(3000); // wait 3 seconds
+}

QT_Py_CH32_Examples/Neopixel_QTPyCH32/Neopixel_QTPyCH32.ino

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+// SPDX-FileCopyrightText: 2024 ladyada for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <Arduino.h>
+#include <Adafruit_TinyUSB.h> // required for USB Serial
+#include <Adafruit_NeoPixel.h>
+
+const int neopixel_pin = PA4;
+#define LED_COUNT 1
+Adafruit_NeoPixel pixels(LED_COUNT, neopixel_pin, NEO_GRB + NEO_KHZ800);
+
+void setup () {
+  pixels.begin();
+}
+
+uint16_t firstPixelHue = 0;
+
+void loop() {  
+  firstPixelHue += 256;
+  for(int i=0; i<pixels.numPixels(); i++) {
+      int pixelHue = firstPixelHue + (i * 65536L / pixels.numPixels());
+      pixels.setPixelColor(i, pixels.gamma32(pixels.ColorHSV(pixelHue)));
+    }
+  pixels.show();
+  
+  delay(10);
+
+}