update()

void FLASHMEM Touch::update

(

void

)

Definition at line 34 of file touch.cpp.

{
    //Serial.println("Touch:update");
    int16_t data[6];
 
    if (!isrWake) return;
    uint32_t now = millis();
    if (now - msraw < MSEC_THRESHOLD) return;
 
    SPI1.beginTransaction(SPI_SETTING);
    digitalWrite(csPin, LOW);
    SPI1.transfer(0xB1 /* Z1 */);
    int16_t z1 = SPI1.transfer16(0xC1 /* Z2 */) >> 3;
    int z = z1 + 4095;
    int16_t z2 = SPI1.transfer16(0x91 /* X */) >> 3;
    z -= z2;
    if (z >= Z_THRESHOLD) {
        SPI1.transfer16(0x91 /* X */);  // dummy X measure, 1st is always noisy
        data[0] = SPI1.transfer16(0xD1 /* Y */) >> 3;
        data[1] = SPI1.transfer16(0x91 /* X */) >> 3; // make 3 x-y measurements
        data[2] = SPI1.transfer16(0xD1 /* Y */) >> 3;
        data[3] = SPI1.transfer16(0x91 /* X */) >> 3;
    }
    else data[0] = data[1] = data[2] = data[3] = 0; // Compiler warns these values may be used unset on early exit.
    data[4] = SPI1.transfer16(0xD0 /* Y */) >> 3;   // Last Y touch power down
    data[5] = SPI1.transfer16(0) >> 3;
    digitalWrite(csPin, HIGH);
    SPI1.endTransaction();
    //Serial.printf("z=%d  ::  z1=%d,  z2=%d  ", z, z1, z2);
    if (z < 0) z = 0;
    if (z < Z_THRESHOLD) { //   if ( !touched ) {
        // Serial.println();
        zraw = 0;
        if (z < Z_THRESHOLD_INT) { //   if ( !touched ) {
            if (255 != tirqPin) isrWake = false;
        }
        return;
    }
    zraw = z;
 
    // Average pair with least distance between each measured x then y
    //Serial.printf("    z1=%d,z2=%d  ", z1, z2);
    //Serial.printf("p=%d,  %d,%d  %d,%d  %d,%d", zraw,
        //data[0], data[1], data[2], data[3], data[4], data[5]);
    int16_t x = besttwoavg( data[0], data[2], data[4] );
    int16_t y = besttwoavg( data[1], data[3], data[5] );
 
    //Serial.printf("    %d,%d", x, y);
    //Serial.println();
    if (z >= Z_THRESHOLD) {
        msraw = now;    // good read completed, set wait
        switch (rotation) {
          case 0:
            xraw = 4095 - y;
            yraw = x;
            break;
          case 1:
            xraw = x;
            yraw = y;
            break;
          case 2:
            xraw = y;
            yraw = 4095 - x;
            break;
          default: // 3
            xraw = 4095 - x;
            yraw = 4095 - y;
        }
    }
}

References besttwoavg(), csPin, msraw, rotation, tirqPin, xraw, yraw, and zraw.

Referenced by AppManager::update().

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