TouchDrvCST226.cpp

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#include "../SensorBuildOpt.h"
#if !SENSORLIB_EXCLUDE_TOUCH_CST226
 
#include "TouchDrvCST226.hpp"
 
void TouchDrvCST226::reset()
{
    if (_pinsCfg.rstPin != -1) {
        hal->pinMode(_pinsCfg.rstPin, OUTPUT);
        hal->digitalWrite(_pinsCfg.rstPin, LOW);
        hal->delay(100);
        hal->digitalWrite(_pinsCfg.rstPin, HIGH);
        hal->delay(100);
    } else {
        writeReg(0xD1, 0x0E);
        hal->delay(20);
    }
}
 
const TouchPoints &TouchDrvCST226::getTouchPoints()
{
    static constexpr uint8_t POINT_BUFFER_SIZE = 28;
    static constexpr uint8_t STATUS_REG   = 0x00;
    uint8_t buffer[POINT_BUFFER_SIZE] = {0};
    uint8_t index = 0;
 
    // Clear cached touch points
    _touchPoints.clear();
 
    if (readRegBuff(STATUS_REG, buffer, POINT_BUFFER_SIZE) == 0) {
 
        if (buffer[0] == 0x83 && buffer[1] == 0x17 && buffer[5] == 0x80) {
            if (_HButtonCallback) {
                _HButtonCallback(_userData);
            }
            return _touchPoints;
        }
 
        if (buffer[6] != 0xAB)return _touchPoints; // Return zero points
        if (buffer[0] == 0xAB)return _touchPoints; // Return zero points
        if (buffer[0] == 0x00)return _touchPoints; // Return zero points
        if (buffer[5] == 0x80)return _touchPoints; // Return zero points
 
        uint8_t numPoints = buffer[5] & 0x7F; // Get number of touch points (lower 7 bits)
 
        // Validate number of touch points
        if (numPoints == 0 || numPoints > MAX_FINGER_NUM) {
            writeReg(0x00, 0xAB);
            return _touchPoints; // Return zero points
        }
 
        // If not center button, add point
        for (int i = 0; i < numPoints; i++) {
            const uint16_t x = (buffer[index + 1] << 4) | ((buffer[index + 3] >> 4) & 0x0F);
            const uint16_t y = (buffer[index + 2] << 4) | (buffer[index + 3] & 0x0F);
            const uint16_t pressure = buffer[index + 4];
            const uint8_t id = (buffer[index] & 0xF0) >> 4;
            const uint8_t event = buffer[index] & 0x0F;
            _touchPoints.addPoint(x, y, pressure, id, event);
            index = (i == 0) ?  (index + 7) :  (index + 5);
        }
        // Swap XY or mirroring coordinates,if set
        updateXY(_touchPoints);
    }
    return _touchPoints;
}
 
const char *TouchDrvCST226::getModelName()
{
    switch (_chipID) {
    case CST226SE_CHIPTYPE:
        return "CST226SE";
    case CST328_CHIPTYPE:
        return "CST328";
    case CST3240_CHIPTYPE:
        return "CST3240";
    default:
        break;
    }
    return "Unknown";
}
 
void TouchDrvCST226::sleep()
{
    writeReg(0xD1, 0x05);
#ifdef ARDUINO_ARCH_ESP32
    if (_pinsCfg.irqPin != -1) {
        hal->pinMode(_pinsCfg.irqPin, OPEN_DRAIN);
    }
    if (_pinsCfg.rstPin != -1) {
        hal->pinMode(_pinsCfg.rstPin, OPEN_DRAIN);
    }
#endif
}
 
bool TouchDrvCST226::initImpl(uint8_t)
{
    uint8_t buffer[8];
    // Enter Command mode
    writeReg(0xD1, 0x01);
    hal->delay(10);
    uint8_t write_buffer[2] = {0xD1, 0xFC};
    writeThenRead(write_buffer, 2, buffer, 4);
 
    uint32_t checkcode = (buffer[3] << 24) | (buffer[2] << 16) | (buffer[1] << 8) | buffer[0];
    SENSORLIB_LOG_I("Chip checkcode:0x%" PRIX32 ".", checkcode);
 
    write_buffer[0] = 0xD1;
    write_buffer[1] = 0xF8;
    writeThenRead(write_buffer, 2, buffer, 4);
    _touchConfig.resolutionX = ( buffer[1] << 8) | buffer[0];
    _touchConfig.resolutionY = ( buffer[3] << 8) | buffer[2];
    SENSORLIB_LOG_I("Chip resolution X:%u Y:%u", _touchConfig.resolutionX, _touchConfig.resolutionY);
 
    write_buffer[0] = 0xD2;
    write_buffer[1] = 0x04;
    writeThenRead(write_buffer, 2, buffer, 4);
    uint32_t chipType = buffer[3];
    chipType <<= 8;
    chipType |= buffer[2];
 
 
    uint32_t ProjectID = buffer[1];
    ProjectID <<= 8;
    ProjectID |= buffer[0];
    SENSORLIB_LOG_I("Chip type: 0x%04" PRIX32 ", ProjectID: 0x%04" PRIX32, chipType, ProjectID);
 
 
    write_buffer[0] = 0xD2;
    write_buffer[1] = 0x08;
    writeThenRead(write_buffer, 2, buffer, 8);
 
    uint32_t fwVersion = buffer[3];
    fwVersion <<= 8;
    fwVersion |= buffer[2];
    fwVersion <<= 8;
    fwVersion |= buffer[1];
    fwVersion <<= 8;
    fwVersion |= buffer[0];
 
    uint32_t checksum = buffer[7];
    checksum <<= 8;
    checksum |= buffer[6];
    checksum <<= 8;
    checksum |= buffer[5];
    checksum <<= 8;
    checksum |= buffer[4];
 
    SENSORLIB_LOG_I("Chip ic version:0x%" PRIx32 ", checksum:0x%" PRIx32,
                    fwVersion, checksum);
 
    if (fwVersion == 0xA5A5A5A5) {
        SENSORLIB_LOG_E("Chip ic don't have firmware.");
        return false;
    }
    if ((checkcode & 0xffff0000) != 0xCACA0000) {
        SENSORLIB_LOG_E("Firmware info read error.");
        return false;
    }
 
    switch (chipType) {
    case CST226SE_CHIPTYPE:
    case CST3240_CHIPTYPE:
    case CST328_CHIPTYPE:
        break;
    default:
        SENSORLIB_LOG_E("Chip ID does not match, should be 0x%02" PRIX8 " ,but is 0x%02" PRIX32, CST226SE_CHIPTYPE, chipType);
        return false;
    }
 
    _chipID = chipType;
 
    // Exit Command mode
    writeReg(0xD1, 0x09);
 
    _maxTouchPoints = 5;
 
    return true;
}
 
#endif