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#include "mcp342xchannel.h"
#include "extern-plugininfo.h"

#include <unistd.h>

#define GENERAL_CALL_RESET      0x0006
#define GENERAL_CALL_LATCH      0x0004
#define GENERAL_CALL_CONVERSION 0x0008

#define CONFIGURATION_REGISTER


MCP342XChannel::MCP342XChannel(const QString &portName, int address, int channel, Gain gain, QObject *parent) :
    I2CDevice(portName, address, parent),
    m_channel(channel),
    m_gain(gain)
{

}

QByteArray MCP342XChannel::readData(int fd)
{
    // Wair for previous messurements to be completed
    char readBuf[3] = {0};
    do {
        if (read(fd, readBuf, 3) != 3) {
            qCWarning(dcUniPi()) << "MCP342X: could not read ADC data";
            return QByteArray();
        }
    } while (!(readBuf[2] & (1 << ConfRegisterBits::RDY)));

    // Start a configuration conversation
    unsigned char writeBuf[1] = {0};
    writeBuf[0] |= (m_channel & 0x0003) << ConfRegisterBits::C0;
    writeBuf[0] |= m_gain << ConfRegisterBits::G0;
    //writeBuf[0] |= SampleRateSelectionBit::Bits18 << ConfRegisterBits::S0;
    writeBuf[0] |= 1 << ConfRegisterBits::OC;   // one shot
    writeBuf[0] |= 1 << ConfRegisterBits::RDY;  // start conversoin
    if (write(fd, writeBuf, 1) != 1) {
        qCWarning(dcUniPi()) << "MCP342X: could not write config register";
        return QByteArray();
    }

    // Wait again for the device to finish measurement
    do {
        if (read(fd, readBuf, 3) != 3) {
            qCWarning(dcUniPi()) << "MCP342X: could not read ADC data";
            return QByteArray();
        }
    } while (!(readBuf[2] & (1 << ConfRegisterBits::RDY)));

    if ((readBuf[2] & (0x03 << ConfRegisterBits::C0)) != ((m_channel & 0x0003) << ConfRegisterBits::C0))
        return QByteArray();

    return QByteArray(readBuf, 3);
}