digicode-keyboard/HostCommunication.cpp

//
// Created by robin on 5/5/16.
//

#include "HostCommunication.h"

#include <Arduino.h>

HostCommunication::HostCommunication()
{
}

void HostCommunication::init()
{
    Serial.begin(SERIAL_BAUDRATE);
    debug("Starting...");
}

void HostCommunication::debug(String str)
{
#ifdef DEBUG
    send(PACKET_DEBUG, str);
#endif
}

void HostCommunication::selfTest()
{
    send(PACKET_SELF_TEST);
}

void HostCommunication::login(String uid, String password)
{
    send(PACKET_LOGIN, uid + "\n" + password);
}

void HostCommunication::send(SERIAL_PACKET_TYPE type)
{
    send(type, "");
}

void HostCommunication::send(SERIAL_PACKET_TYPE type, String str)
{
    Serial.write((SERIAL_PACKET_TYPE)type);
    Serial.write((SERIAL_PACKET_LENGTH_TYPE)str.length());
    Serial.write(str.c_str());
}

HostCommunicationResult HostCommunication::read(int timeout)
{
    HostCommunicationResult res;
    res.length = 0;
    res.data = 0;
    res.isSuccess = false;
    if (!waitData(timeout, sizeof(SERIAL_PACKET_LENGTH_TYPE))) {
        return res;
    }

    SERIAL_PACKET_LENGTH_TYPE length = 0;
    Serial.readBytes((char*)&length, sizeof(SERIAL_PACKET_LENGTH_TYPE));

    if (!waitData(timeout, length)) {
        return res;
    }

    res.data = new char[length];
    Serial.readBytes(res.data, length);
    res.isSuccess = true;
    res.length = length;

    return res;
}

bool HostCommunication::waitData(int timeout, int length)
{
    unsigned long secs = millis();
    while (Serial.available() < length && millis() - secs < timeout) {
        delay(1);
    }
    return Serial.available() >= length;
}