TouchDrvHI8561.cpp

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#include "../SensorBuildOpt.h"
#if !SENSORLIB_EXCLUDE_TOUCH_HI8561
 
#include "TouchDrvHI8561.hpp"
 
void TouchDrvHI8561::sleep()
{
    // Unable to achieve, relies on screen sleep
}
 
const TouchPoints &TouchDrvHI8561::getTouchPoints()
{
    static constexpr uint8_t POINT_BUFFER_SIZE = (MAX_FINGER_NUM * BYTES_PER_POINT);
 
    uint8_t buffer[POINT_BUFFER_SIZE] = {0};
 
    _touchPoints.clear(); // Clear cached touch points
 
    uint8_t numPoints = 0;
    if (!makePacketThenRead(REG_INFO, buffer, 1)) {
        return _touchPoints;
    }
 
    numPoints = buffer[0];
    if (numPoints == 0 || numPoints > MAX_FINGER_NUM) {
        return _touchPoints;
    }
 
    uint8_t expectedBytes = numPoints * BYTES_PER_POINT; // 6 bytes per touch point
 
    if (!makePacketThenRead(REG_POINT, buffer, expectedBytes)) {
        return _touchPoints;
    }
 
    for (uint8_t i = 0; i < numPoints; i++) {
        const uint8_t offset =  i * BYTES_PER_POINT ;
        uint16_t x = buffer[offset + 1] | (buffer[offset + 0] << 8);
        uint16_t y = buffer[offset + 3] | (buffer[offset + 2] << 8);
        uint8_t  pressure = buffer[offset + 4];
        // Once edge detection is triggered, subsequent touch points are untrusted and do not need to continue looping.
        if (x == UINT16_MAX || y == UINT16_MAX) {
            SENSORLIB_LOG_E("Edge trigger detected, id %d set to invalid coordinates", i);
            break;
        }
        _touchPoints.addPoint(x, y, pressure, i);
    }
    // Swap XY or mirroring coordinates,if set
    updateXY(_touchPoints);
 
    return _touchPoints;
}
 
const char *TouchDrvHI8561::getModelName()
{
    return "HI8561";
}
 
bool TouchDrvHI8561::initImpl(uint8_t)
{
    // Disable I2C stop bit
    setAck(false);
 
    // Check if the starting address matches
    uint8_t buffer[6];
    if (!makePacketThenRead(REG_SECTION_INFO, buffer, sizeof(buffer))) {
        return false;
    }
    uint32_t reg = buffer[0] + (buffer[1] << 8) + (buffer[2] << 16) + (buffer[3] << 24);
    if (reg != REG_INFO) {
        SENSORLIB_LOG_E("Invalid touch info start address: 0x%08" PRIu32, reg);
        return false;
    }
 
    // Use fixed values ​​to identify chip models.
    _chipID = 0x8561;
 
    SENSORLIB_LOG_D("HI8561 touch start address: 0x%08" PRIu32, reg);
 
    return true;
}
 
#endif