/*****************************************************************************
 * Copyright (c) 2019, Nsing Technologies Pte. Ltd.
 *
 * All rights reserved.
 * ****************************************************************************
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Nations' name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY NATIONS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL NATIONS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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 * ****************************************************************************/

/**
 * @file User_Usart_Config.c
 * @author Nations
 * @version v1.0.1
 *
 * @copyright Copyright (c) 2019, Nsing Technologies Pte. Ltd. All rights reserved.
 */

#include <stdio.h>
#include "n32g45x.h"
#include "n32g45x_usart.h"
#include "User_Usart_Config.h"

uint8_t Receive_Buff[RECEIVE_BUFF_SIZE] = {0x00};
uint8_t USART1_Receive_Read_Cursor = 0;
uint8_t USART1_Receive_Write_Cursor = 0;

/**
 * @brief  Configures the nested vectored interrupt controller.
 */
void NVIC_Configuration(void)
{
    NVIC_InitType NVIC_InitStructure;
    /* Configure the NVIC Preemption Priority Bits */
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
    /* Enable the USARTy Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

/**
 * @brief  Main program
 */
void USART1_Init(void)
{
    GPIO_InitType GPIO_InitStructure;
    USART_InitType USART_InitStructure;
    NVIC_Configuration();
    GPIO_InitStruct(&GPIO_InitStructure);
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO | RCC_APB2_PERIPH_GPIOA, ENABLE);
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_USART1, ENABLE);
    GPIO_InitStructure.Pin = GPIO_PIN_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.Pin = GPIO_PIN_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);
    USART_InitStructure.BaudRate = 115200;
    USART_InitStructure.WordLength = USART_WL_8B;
    USART_InitStructure.StopBits = USART_STPB_1;
    USART_InitStructure.Parity = USART_PE_NO;
    USART_InitStructure.HardwareFlowControl = USART_HFCTRL_NONE;
    USART_InitStructure.Mode = USART_MODE_TX | USART_MODE_RX;
    /* init uart */
    USART_Init(USART1, &USART_InitStructure);
    /* Enable USARTy Receive and Transmit interrupts */
    USART_ConfigInt(USART1, USART_INT_RXDNE, ENABLE);
    /* Enable suart */
    USART_Enable(USART1, ENABLE);
    USART1_Receive_Read_Cursor = 0;
    USART1_Receive_Write_Cursor = 0;
}

/* retarget the C library printf function to the USART */
int fputc(int ch, FILE *f)
{
    USART_SendData(USART1, (uint8_t)ch);
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXC) == RESET)
        ;
    return (ch);
}
