/*
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Marcelo Aquino <marceloaqno@gmail.org>
 * Copyright (C) 2016 Marcelo Aquino
 * Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * Based on TMRh20 RF24 library, Copyright (c) 2015 Charles-Henri Hallard <tmrh20@gmail.com>
 */

#include "SPI.h"
#include <pthread.h>
#include <stdlib.h>
#include "log.h"

static pthread_mutex_t spiMutex = PTHREAD_MUTEX_INITIALIZER;

// Declare a single default instance
SPIClass SPI = SPIClass();

uint8_t SPIClass::initialized = 0;

SPIClass::SPIClass() {
	if (!bcm2835_init()) {
		mys_log(LOG_ERR, "Failed to initialized bcm2835.\n");
		exit(1);
	}
}

SPIClass::~SPIClass() {}

uint8_t SPIClass::isInitialized() {
	return initialized;
}

void SPIClass::begin() {
	if (!initialized) {
		if (!bcm2835_spi_begin()) {
			mys_log(LOG_ERR, "You need to be root to use SPI.\n");
			exit(1);
		}
	}

	initialized++; // reference count
}

void SPIClass::end() {
	if (initialized) {
		initialized--;
	}

	if (!initialized) {
		// End the SPI
		bcm2835_spi_end();
	}
}

void SPIClass::setBitOrder(uint8_t bit_order) {
	bcm2835_spi_setBitOrder(bit_order);
}

void SPIClass::setDataMode(uint8_t data_mode) {
	bcm2835_spi_setDataMode(data_mode);
}

void SPIClass::setClockDivider(uint16_t divider) {
	bcm2835_spi_setClockDivider(divider);
}

void SPIClass::chipSelect(int csn_pin) {
	if (csn_pin == RPI_GPIO_P1_26) csn_pin = BCM2835_SPI_CS1;
	else if (csn_pin == RPI_GPIO_P1_24) csn_pin = BCM2835_SPI_CS0;
	else csn_pin = BCM2835_SPI_CS0;
	bcm2835_spi_chipSelect(csn_pin);
	delayMicroseconds(5);
}

void SPIClass::beginTransaction(SPISettings settings) {
	pthread_mutex_lock(&spiMutex);
	setBitOrder(settings.border);
	setDataMode(settings.dmode);
	setClockDivider(settings.cdiv);
}

void SPIClass::endTransaction() {
	pthread_mutex_unlock(&spiMutex);
}

void SPIClass::usingInterrupt(uint8_t interruptNumber) {
	(void)interruptNumber;
}

void SPIClass::notUsingInterrupt(uint8_t interruptNumber) {
	(void)interruptNumber;
}