/*

	Copyright 2016 - 2019 Benjamin Vedder	benjamin@vedder.se
	modified 2021 by Georg Schardt schardt@team-ctech.de

	Use SPI Port to communicate with e.g. RFM95W Modul

	This file is part of the VESC firmware.

	The VESC firmware is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	The VESC firmware is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "conf_general.h"
#ifdef HW_HAS_LORA

#include "app.h"
#include "ch.h"
#include "hal.h"
#include "hw.h"
#include "packet.h"
#include "commands.h"
#include "lora.h"
#include <string.h>
#include "SX1278.h"
#include "stdio.h"

// Threads
static THD_FUNCTION(packet_process_thread, arg);
static THD_WORKING_AREA(packet_process_thread_wa, 2048);

// Variables
static volatile bool thread_is_running = false;
static mutex_t send_mutex;
static bool send_mutex_init_done = false;
PACKET_STATE_t  packet_state;
SX1278_t SX1278;

// Private functions
static void process_packet(unsigned char* data, unsigned int len);
static void send_packet(unsigned char* data, unsigned int len);

void lora_send_packet(unsigned char* data, unsigned int len) {
	if (!send_mutex_init_done) {
		chMtxObjectInit(&send_mutex);
		send_mutex_init_done = true;
	}
	chMtxLock(&send_mutex);
	packet_send_packet(data, len, &packet_state);
	chMtxUnlock(&send_mutex);
}

static void process_packet(unsigned char* data, unsigned int len) {
	commands_process_packet(data, len, lora_send_packet);
}

static void send_packet(unsigned char* data, unsigned int len) {
	SX1278_LoRaEntryTx(&SX1278, len, 100);
	SX1278_LoRaTxPacket(&SX1278, (uint8_t*)data, len, 100);
}

void lora_init(void) {
	packet_init(send_packet, process_packet, &packet_state);

	palSetPadMode(HW_LORA_SPI_PORT_SCK, HW_LORA_SPI_PIN_SCK, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
	palSetPadMode(HW_LORA_SPI_PORT_MISO, HW_LORA_SPI_PIN_MISO, PAL_MODE_INPUT);
	palSetPadMode(HW_LORA_SPI_PORT_NSS, HW_LORA_SPI_PIN_NSS, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
	palSetPadMode(HW_LORA_SPI_PORT_MOSI, HW_LORA_SPI_PIN_MOSI, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
	palSetPadMode(HW_LORA_SPI_PORT_DIO0, HW_LORA_SPI_PIN_DIO0, PAL_MODE_INPUT);
	palSetPadMode(HW_LORA_SPI_PORT_RESET, HW_LORA_SPI_PIN_RESET, PAL_MODE_OUTPUT_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
	SX1278_init(&SX1278, 868000000, SX1278_POWER_17DBM, SX1278_LORA_SF_7, SX1278_LORA_BW_250KHZ, SX1278_LORA_CR_4_5, SX1278_LORA_CRC_DIS, 10);
	if (!thread_is_running) {
		chThdCreateStatic(packet_process_thread_wa, sizeof(packet_process_thread_wa), NORMALPRIO, packet_process_thread, NULL);
		thread_is_running = true;
	}
}

void lora_stop(void) {
}

static THD_FUNCTION(packet_process_thread, arg) {
	(void)arg;

	uint8_t erg;
	uint8_t buffer[255];
	chRegSetThreadName("LoRa proc");

	buffer[0] = COMM_GET_VALUES;

	while (!commands_is_initialized()) {
		chThdSleepMilliseconds(10);
	}
	erg=SX1278_LoRaEntryRx(&SX1278, 255, 200);
	for (;;) {
		erg = SX1278_LoRaRxPacket(&SX1278);
		if (erg > 0) {
			for (int i=0; i<SX1278.readBytes; i++)
				packet_process_byte(SX1278.rxBuffer[i],&packet_state);
			erg=SX1278_LoRaEntryRx(&SX1278, 255, 200);
		}
		chThdSleepMilliseconds(10);
	}
}

#endif