/*
 * Copyright (C) 2019  Max Regan
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "Bsp/Drivers/UsartDriver.h"
#include "Bsp/macros.h"

namespace BSP {

using RC = BSP::ReturnCode;
using BSP::Schedule::TaskScheduler;
using BSP::Schedule::NextTime;
using BSP::Time;

UsartDriver::UsartDriver(USART_TypeDef *usart, TaskScheduler &scheduler)
    : m_scheduler(scheduler)
    , m_usart(usart)
{}

void UsartDriver::init()
{
#if defined(STM32L0XX)
    if (m_usart == USART2) {
        RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
    }
#elif defined(STM32L4XX)
    if (m_usart == USART1) {
        RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
    } else if (m_usart == USART2) {
        RCC->APB1ENR1 |= RCC_APB1ENR1_USART2EN;
    } else if (m_usart == USART3) {
        RCC->APB1ENR1 |= RCC_APB1ENR1_USART3EN;
    }
#else
#error "Unknown device family"
#endif

    // TODO: Don't hardcode the main clock value here
    m_usart->BRR  = (4100000) / 115200L; // set baudrate (APBCLK / baud)
    m_usart->CR1 |= (USART_CR1_TE); // TX enable
    m_usart->CR1 |= USART_CR1_UE; // USART enable
}

NextTime UsartDriver::execute()
{
    return NextTime::never();
}

RC UsartDriver::tx_blocking(const uint8_t *data, size_t len)
{
    for (size_t i = 0; i < len; i++) {
        while (!(m_usart->ISR & USART_ISR_TXE)) {}
        m_usart->TDR = data[i];
    }

    return RC::OK;
}

RC UsartDriver::tx_blocking(const char *data)
{
    size_t len = 0;
    while (data[len] != '\0') {
        len++;
    };

    return tx_blocking(reinterpret_cast<const uint8_t *>(data), len);
}


}