/*
 * SpiTemperatureSensor.cpp
 *
 *  Created on: 8 Jun 2017
 *      Author: David
 */

#include "SpiTemperatureSensor.h"

SpiTemperatureSensor::SpiTemperatureSensor(unsigned int channel, const char *name, unsigned int relativeChannel, uint8_t spiMode, uint32_t clockFrequency)
	: TemperatureSensor(channel, name)
{
	device.csPin = SpiTempSensorCsPins[relativeChannel];
	device.spiMode = spiMode;
	device.clockFrequency = clockFrequency;
	lastTemperature = 0.0;
	lastResult = TemperatureError::notInitialised;
}

void SpiTemperatureSensor::InitSpi()
{
	sspi_master_init(&device, 8);
	lastReadingTime = millis();
}

// Send and receive 1 to 4 bytes of data and return the result as a single 32-bit word
TemperatureError SpiTemperatureSensor::DoSpiTransaction(const uint8_t dataOut[], size_t nbytes, uint32_t& rslt) const
{
	if (!sspi_acquire())
	{
		return TemperatureError::busBusy;
	}

	sspi_master_setup_device(&device);
	delayMicroseconds(1);
	sspi_select_device(&device);
	delayMicroseconds(1);

	uint8_t rawBytes[4];
	spi_status_t sts = sspi_transceive_packet(dataOut, rawBytes, nbytes);

	delayMicroseconds(1);
	sspi_deselect_device(&device);
	delayMicroseconds(1);

	sspi_release();

	if (sts != SPI_OK)
	{
		return TemperatureError::timeout;
	}

	rslt = rawBytes[0];
	for (size_t i = 1; i < nbytes; ++i)
	{
		rslt <<= 8;
		rslt |= rawBytes[i];
	}

	return TemperatureError::success;
}

// End