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CH552 examples
Adding examples for the QT Py CH552 learn guide. examples for led blink, analog in, capacitive touch, i2c with the AHT20 and neopixel swirl
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‎QT_Py_CH552_Examples/Blink_QTPyCH552/Blink_QTPyCH552.ino

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// SPDX-FileCopyrightText: 2024 ladyada for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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#define NEOPIXEL_PIN 10
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#define A0 11
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#define A1 14
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#define A2 15
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#define MOSI A2
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#define MISO 16
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#define SCK 17
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#define RX 30
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#define TX 31
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#define A3 32
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#define SCL 33
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#define SDA 34
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int led = MISO;
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void setup() {
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pinMode(led, OUTPUT);
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}
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void loop() {
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digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
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delay(1000); // wait for a second
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digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
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delay(1000); // wait for a second
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}

‎QT_Py_CH552_Examples/CapTouch_QTPyCH552/CapTouch_QTPyCH552.ino

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// SPDX-FileCopyrightText: 2024 ladyada for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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#include <TouchKey.h>
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uint8_t count = 0;
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uint8_t state = 0;
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void setup() {
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while (!USBSerial()); // wait for serial port to connect. Needed for native USB port only
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delay(100);
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USBSerial_println("QT Py CH552 Cap Touch Test");
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USBSerial_println("Uses pin A0 (P1.1)");
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TouchKey_begin((1 << 1)); //Enable channel P1.1/A0
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}
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void loop() {
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// put your main code here, to run repeatedly:
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TouchKey_Process();
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uint8_t touchResult = TouchKey_Get();
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if (touchResult) {
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if (state == 0) {
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count += 1;
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state = 1;
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USBSerial_print("TIN1.1 touched ");
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USBSerial_print(count);
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USBSerial_println(" times");
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}
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} else {
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state = 0;
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}
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delay(1000);
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}

‎QT_Py_CH552_Examples/I2C_AHT20_QTPyCH552/I2C_AHT20_QTPyCH552.ino

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// SPDX-FileCopyrightText: 2024 ladyada for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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// https://chat.openai.com/share/5dddee44-3196-4a6b-b445-58ac6ef18501
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#include <SoftI2C.h>
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extern uint8_t scl_pin;
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extern uint8_t sda_pin;
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void Wire_begin(uint8_t scl, uint8_t sda);
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bool Wire_scan(uint8_t i2caddr);
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bool Wire_writeBytes(uint8_t i2caddr, uint8_t *data, uint8_t bytes);
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bool Wire_readBytes(uint8_t i2caddr, uint8_t *data, uint8_t bytes);
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bool Wire_readRegister(uint8_t i2caddr, uint8_t regaddr, uint8_t *data, uint8_t bytes);
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bool readAHT20(float *temperature, float *humidity);
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#define AHTX0_I2CADDR_DEFAULT 0x38
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void setup() {
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while (!USBSerial()); // wait for serial port to connect. Needed for native USB port only
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delay(100);
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USBSerial_println("CH552 QT Py I2C sensor test");
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Wire_begin(33, 34); // set up I2C on CH552 QT Py
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USBSerial_print("I2C Scan: ");
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for (uint8_t a=0; a<=0x7F; a++) {
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if (!Wire_scan(a)) continue;
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USBSerial_print("0x");
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USBSerial_print(a, HEX);
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USBSerial_print(", ");
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}
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USBSerial_println();
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if (! Wire_scan(AHTX0_I2CADDR_DEFAULT)) {
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USBSerial_println("No AHT20 found!");
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while (1);
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}
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}
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void loop() {
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delay(100);
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float t, h;
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if (!readAHT20(&t, &h)) {
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USBSerial_println("Failed to read from AHT20");
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}
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USBSerial_print("Temp: ");
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USBSerial_print(t);
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USBSerial_print(" *C, Hum: ");
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USBSerial_print(h);
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USBSerial_println(" RH%");
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}
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/*********************** AHT20 'driver */
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#define AHTX0_CMD_TRIGGER 0xAC
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#define AHTX0_STATUS_BUSY 0x80
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bool AHT20_getStatus(uint8_t *status) {
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return Wire_readBytes(AHTX0_I2CADDR_DEFAULT, status, 1);
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}
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bool readAHT20(float *temperature, float *humidity) {
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uint8_t cmd[3] = {AHTX0_CMD_TRIGGER, 0x33, 0x00};
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uint8_t data[6], status;
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uint32_t rawHumidity, rawTemperature;
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// Trigger AHT20 measurement
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if (!Wire_writeBytes(AHTX0_I2CADDR_DEFAULT, cmd, 3)) {
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return false;
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}
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// Wait until the sensor is no longer busy
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do {
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if (!AHT20_getStatus(&status)) {
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return false;
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}
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delay(10); // Delay 10ms to wait for measurement
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} while (status & AHTX0_STATUS_BUSY);
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// Read the measurement data
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if (!Wire_readBytes(AHTX0_I2CADDR_DEFAULT, data, 6)) {
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return false;
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}
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// Parse humidity data
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rawHumidity = data[1];
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rawHumidity = (rawHumidity << 8) | data[2];
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rawHumidity = (rawHumidity << 4) | (data[3] >> 4);
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*humidity = ((float)rawHumidity * 100.0) / 0x100000;
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// Parse temperature data
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rawTemperature = (data[3] & 0x0F);
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rawTemperature = (rawTemperature << 8) | data[4];
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rawTemperature = (rawTemperature << 8) | data[5];
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*temperature = ((float)rawTemperature * 200.0 / 0x100000) - 50.0;
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return true;
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}
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/**************************** Wire I2C interface */
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void Wire_begin(uint8_t scl, uint8_t sda) {
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scl_pin = scl; //extern variable in SoftI2C.h
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sda_pin = sda;
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I2CInit();
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}
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bool Wire_scan(uint8_t i2caddr) {
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return Wire_writeBytes(i2caddr, NULL, 0);
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}
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bool Wire_readRegister(uint8_t i2caddr, uint8_t regaddr, uint8_t *data, uint8_t bytes) {
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if (!Wire_writeBytes(i2caddr, &regaddr, 1)) {
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return false;
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}
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return Wire_readBytes(i2caddr, data, bytes);
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}
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bool Wire_writeBytes(uint8_t i2caddr, uint8_t *data, uint8_t bytes) {
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uint8_t ack_bit;
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I2CStart();
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ack_bit = I2CSend(i2caddr << 1 | 0); // Shift address and append write bit
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if (ack_bit != 0) {
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I2CStop();
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return false;
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}
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for (uint8_t i = 0; i < bytes; i++) {
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if (I2CSend(data[i]) != 0) {
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I2CStop();
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return false;
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}
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}
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I2CStop();
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return true;
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}
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bool Wire_readBytes(uint8_t i2caddr, uint8_t *data, uint8_t bytes) {
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uint8_t ack_bit;
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I2CStart();
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ack_bit = I2CSend(i2caddr << 1 | 1); // Shift address and append read bit
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if (ack_bit != 0) {
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I2CStop();
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return false;
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}
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for (uint8_t i = 0; i < bytes; i++) {
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data[i] = I2CRead();
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if (i == bytes - 1) {
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I2CNak(); // NAK on last byte
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} else {
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I2CAck(); // ACK on other bytes
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}
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}
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I2CStop();
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return true;
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}

‎QT_Py_CH552_Examples/Neopixel_QTPyCH552/Neopixel_QTPyCH552.ino

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// SPDX-FileCopyrightText: 2024 ladyada for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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#include <WS2812.h>
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#define NEOPIXEL_PIN P1_0
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#define NUM_LEDS 1
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#define COLOR_PER_LEDS 3
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#define NUM_BYTES (NUM_LEDS*COLOR_PER_LEDS)
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#if NUM_BYTES > 255
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#error "NUM_BYTES can not be larger than 255."
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#endif
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__xdata uint8_t ledData[NUM_BYTES];
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/***********************************************************************/
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uint8_t neopixel_brightness = 255;
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uint32_t Wheel(byte WheelPos);
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void rainbowCycle(uint8_t wait);
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#define NEOPIXEL_SHOW_FUNC CONCAT(neopixel_show_, NEOPIXEL_PIN)
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void neopixel_begin() {
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pinMode(NEOPIXEL_PIN, OUTPUT); //Possible to use other pins.
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}
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void neopixel_show() {
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NEOPIXEL_SHOW_FUNC(ledData, NUM_BYTES); //Possible to use other pins.
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}
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void neopixel_setPixelColor(uint8_t i, uint32_t c) {
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uint16_t r, g, b;
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r = (((c >> 16) & 0xFF) * neopixel_brightness) >> 8;
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g = (((c >> 8) & 0xFF) * neopixel_brightness) >> 8;
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b = ((c & 0xFF) * neopixel_brightness) >> 8;
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set_pixel_for_GRB_LED(ledData, i, r, g, b);
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}
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void neopixel_setBrightness(uint8_t b) {
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neopixel_brightness = b;
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}
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/***********************************************************************/
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void setup() {
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neopixel_begin();
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neopixel_setBrightness(50);
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}
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void loop() {
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rainbowCycle(5);
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}
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void rainbowCycle(uint8_t wait) {
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uint8_t i, j;
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for (j=0; j<255; j++) {
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for (i=0; i < NUM_LEDS; i++) {
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neopixel_setPixelColor(i, Wheel(((i * 256 / NUM_LEDS) + j) & 255));
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}
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neopixel_show();
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delay(wait);
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}
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}
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// Input a value 0 to 255 to get a color value.
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// The colours are a transition r - g - b - back to r.
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uint32_t Wheel(byte WheelPos) {
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uint8_t r, g, b;
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uint32_t c;
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if(WheelPos < 85) {
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r = WheelPos * 3;
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g = 255 - WheelPos * 3 ;
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b = 0;
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} else if(WheelPos < 170) {
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WheelPos -= 85;
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r = 255 - WheelPos * 3;
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g = 0;
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b = WheelPos * 3;
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} else {
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WheelPos -= 170;
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r = 0;
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g = WheelPos * 3;
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b = 255 - WheelPos * 3;
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}
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c = r;
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c <<= 8;
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c |= g;
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c <<= 8;
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c |= b;
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return c;
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}

‎QT_Py_CH552_Examples/analogIn_QTPyCH552/analogIn_QTPyCH552.ino

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// SPDX-FileCopyrightText: 2024 ladyada for Adafruit Industries
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//
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// SPDX-License-Identifier: MIT
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/*
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ReadAnalogVoltage
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Reads an analog input on pin P1.1, converts it to voltage, and prints the result to the Serial Monitor.
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Graphical representation is available using Serial Plotter (Tools > Serial Plotter menu).
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Attach the center pin of a potentiometer to pin P1.1, and the outside pins to +5V and ground.
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This example code is in the public domain.
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http://www.arduino.cc/en/Tutorial/ReadAnalogVoltage
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*/
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#include <Serial.h>
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#define A0 11
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#define A1 14
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#define A2 15 // also MISO!
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#define A3 32
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#define ANALOG_IN A3
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#define VREF 3.3
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// the setup routine runs once when you press reset:
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void setup() {
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// No need to init USBSerial
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// By default 8051 enable every pin's pull up resistor. Disable pull-up to get full input range.
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pinMode(ANALOG_IN, INPUT);
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}
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// the loop routine runs over and over again forever:
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void loop() {
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// read the input on analog pin 0, P1.1:
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int sensorValue = analogRead(ANALOG_IN);
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// Convert the analog reading (which goes from 0 - 255) to VREF:
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float voltage = sensorValue * (VREF / 255.0);
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// print out the value you read:
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USBSerial_println(voltage);
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// or with precision:
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//USBSerial_println(voltage,1);
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delay(10);
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}

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