/* UART Echo Example

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/uart.h"
#include "driver/gpio.h"
#include "sdkconfig.h"
#include "esp_log.h"
#include "uart.h"

/**
 * This is an example which echos any data it receives on configured UART back to the sender,
 * with hardware flow control turned off. It does not use UART driver event queue.
 *
 * - Port: configured UART
 * - Receive (Rx) buffer: on
 * - Transmit (Tx) buffer: off
 * - Flow control: off
 * - Event queue: off
 * - Pin assignment: see defines below (See Kconfig)
 */

#define RS485_TXD_PIN       17
#define RS485_RXD_PIN       18
#define RS485_RTS_PIN       8
#define RS485_CTS_PIN       (-1)

// #define MCU_TXD_PIN      17
// #define MCU_RXD_PIN      18


#define PRINT_TXD_PIN      16
#define PRINT_RXD_PIN      15
#define PRINT_RTS_PIN      (-1)
#define PRINT_CTS_PIN      3


#define RS485_UART_PORT_NUM      (0)
#define RS485_UART_BAUD_RATE     (115200)
#define RS485_TASK_STACK_SIZE    (1024)

#define PRINT_UART_PORT_NUM      (1)
#define PRINT_UART_BAUD_RATE     (115200)
#define PRINT_TASK_STACK_SIZE    (1024)

// static const char *TAG = "UART";

#define BUF_SIZE (1024)

void RS485_init(void)
{
    uart_config_t uart_config = {
        .baud_rate = RS485_UART_BAUD_RATE,
        .data_bits = UART_DATA_8_BITS,
        .parity    = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
        .source_clk = UART_SCLK_APB,
    };
    int intr_alloc_flags = 0;

#if CONFIG_UART_ISR_IN_IRAM
    intr_alloc_flags = ESP_INTR_FLAG_IRAM;
#endif

    ESP_ERROR_CHECK(uart_driver_install(RS485_UART_PORT_NUM, BUF_SIZE * 2, 0, 0, NULL, intr_alloc_flags));
    ESP_ERROR_CHECK(uart_param_config(RS485_UART_PORT_NUM, &uart_config));
    ESP_ERROR_CHECK(uart_set_pin(RS485_UART_PORT_NUM, RS485_TXD_PIN, RS485_RXD_PIN, RS485_RTS_PIN, RS485_CTS_PIN));
}

void print_init(void)
{
    uart_config_t uart_config = {
        .baud_rate = PRINT_UART_BAUD_RATE,
        .data_bits = UART_DATA_8_BITS,
        .parity    = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
        .source_clk = UART_SCLK_APB,
    };
    int intr_alloc_flags = 0;

#if CONFIG_UART_ISR_IN_IRAM
    intr_alloc_flags = ESP_INTR_FLAG_IRAM;
#endif

    ESP_ERROR_CHECK(uart_driver_install(PRINT_UART_PORT_NUM, BUF_SIZE * 2, 0, 0, NULL, intr_alloc_flags));
    ESP_ERROR_CHECK(uart_param_config(PRINT_UART_PORT_NUM, &uart_config));
    ESP_ERROR_CHECK(uart_set_pin(PRINT_UART_PORT_NUM, PRINT_TXD_PIN, PRINT_RXD_PIN, PRINT_RTS_PIN, PRINT_CTS_PIN));
}