/*----------------------------------------------------------------------------
 * Copyright (c) Huawei Technologies Co., Ltd. 2021-2021. All rights reserved.
 * Description: Usart Init Implementation
 * Author: Huawei LiteOS Team
 * Create: 2021-03-20
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 * of conditions and the following disclaimer in the documentation and/or other materials
 * provided with the distribution.
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific prior written
 * permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS 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, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * --------------------------------------------------------------------------- */

#include "usart.h"
#include "los_hwi.h"
#include "platform.h"
#include "gd32f30x.h"

VOID Usart0Init(UINT32 bound)
{
    rcu_periph_clock_enable(RCU_GPIOA);
    rcu_periph_clock_enable(RCU_USART0);

    gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_9);

    gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_10);

    usart_deinit(USART0);
    usart_baudrate_set(USART0, bound);
    usart_receive_config(USART0, USART_RECEIVE_ENABLE);
    usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
    usart_enable(USART0);
}

VOID UsartInit(VOID) {
    Usart0Init(USART_DEFAULT_BOUND);
}

VOID UsartWrite(const CHAR c)
{
    while (usart_flag_get(USART0, USART_FLAG_TBE) == 0) {}
    usart_data_transmit(USART0, c);
}

UINT8 UsartRead(VOID)
{
    UINT8 ch = 0;
    if (usart_interrupt_flag_get(USART0, USART_INT_FLAG_RBNE) == RESET) {
        return ch;
    }
    ch = (UINT8)(usart_data_receive(USART0) & 0xFF);
    return ch;
}

STATIC VOID UartHandler(VOID)
{
    (VOID)uart_getc();
}

INT32 UsartHwi(VOID)
{
    nvic_irq_enable(USART0_IRQn, 0, 0);
    usart_flag_clear(USART0, USART_INT_RBNE);
    LOS_HwiCreate(NUM_HAL_INTERRUPT_UART, 0, 0, UartHandler, NULL);
    usart_interrupt_enable(USART0, USART_INT_RBNE);
    return LOS_OK;
}

UartControllerOps g_genericUart = {
    .uartInit = UsartInit,
    .uartWriteChar = UsartWrite,
    .uartReadChar = UsartRead,
    .uartHwiCreate = UsartHwi
};
