#include <stdio.h>
#include "esp_err.h"
#include "driver/gpio.h"
#include "esp_spi_flash.h"
#include "esp_types.h"
#include "esp_err.h"
#include "esp_log.h"
#include "driver/uart.h"
#include "driver/adc.h"
#include "rtos_tasks.h"

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/semphr.h"
#include "freertos/ringbuf.h"

#include "esp_attr.h"

#include "esp8266/uart_struct.h"
#include "esp8266/uart_register.h"
#include "esp8266/pin_mux_register.h"
#include "esp8266/eagle_soc.h"
#include "esp8266/rom_functions.h"

#include "rom/ets_sys.h"

#include "driver/uart_select.h"

uint8_t rxbuf[256];
uint16_t final_recvd_bytes = 0;


void IRAM_ATTR uart_intr_handle(void *arg)
{
  uint16_t rx_fifo_len, status;
  uint16_t i = 0;
  
  status = uart0.int_st.val; 
  rx_fifo_len = uart0.status.rxfifo_cnt; 
  
  while(rx_fifo_len){
   rxbuf[i++] = uart0.fifo.rw_byte; 
   rx_fifo_len--;
 }
 final_recvd_bytes = i;
  
 // after reading bytes from buffer clear UART interrupt status
 uart_clear_intr_status(UART_NUM_0, UART_RXFIFO_FULL_INT_CLR|UART_RXFIFO_TOUT_INT_CLR);

}

void IR_RxTx_task()
{
	printf("IR TASK STARTED\n");
	char dataRecvdFromMobileApp[9] = {0x7E, 0xA0, 0x07, 0x03, 0x41, 0x93, 0x5A, 0x64, 0x7E};  //when these bytes are sent to the interfaced module, it send the response.
	
    while (1) 
	{
		vTaskDelay(1000 / portTICK_PERIOD_MS);
		/*for(int i = 0; i < 9; i++)
			printf("Byte sent = 0x%X\n", dataRecvdFromMobileApp[i]);*/
		uart_write_bytes(UART_NUM_0, (const char *) dataRecvdFromMobileApp, 9);
		if(final_recvd_bytes > 0)
		{
			printf("Total bytes recvd = %d\n", final_recvd_bytes);
			for(int i = 0; i < final_recvd_bytes; i++)
				printf("Byte received = 0x%X\n", rxbuf[i]);
			final_recvd_bytes = 0;
		}			
    }
}

void app_main()
{
	int ret;
	uart_config_t uart_config = {
		.baud_rate = 9600,
		.data_bits = UART_DATA_8_BITS,
		.parity = UART_PARITY_DISABLE,
		.stop_bits = UART_STOP_BITS_1,
		.flow_ctrl = UART_HW_FLOWCTRL_DISABLE
	};

	ESP_ERROR_CHECK(uart_param_config(UART_NUM_0, &uart_config));
	ESP_ERROR_CHECK(uart_driver_install(UART_NUM_0, BUF_SIZE * 2, 0, 0, NULL, 0));

	ESP_ERROR_CHECK(uart_isr_register(UART_NUM_0,uart_intr_handle, NULL);
	ESP_ERROR_CHECK(uart_enable_rx_intr(UART_NUM_0));
	xTaskCreate(IR_RxTx_task,"IR_Task",8192,NULL, configMAX_PRIORITIES-1, &ir_task);
}