/*****************************************************************************
 * Copyright (c) 2019, Nations Technologies Inc.
 *
 * 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,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ****************************************************************************/

/**
 * @file main.c
 * @author Nations Solution Team
 * @version v1.0.0
 *
 * @copyright Copyright (c) 2019, Nations Technologies Inc. All rights reserved.
 */
#include "main.h"

/** @addtogroup TIM_OCToggle
 * @{
 */

TIM_TimeBaseInitType TIM_TimeBaseStructure;
OCInitType TIM_OCInitStructure;
__IO uint16_t CCR1_Val  = 32768;
__IO uint16_t CCR2_Val  = 16384;
__IO uint16_t CCR3_Val  = 8192;
__IO uint16_t CCR4_Val  = 4096;
uint16_t PrescalerValue = 0;

void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);

/**
 * @brief  Main program
 */
int main(void)
{
    /* System Clocks Configuration */
    RCC_Configuration();

    /* NVIC Configuration */
    NVIC_Configuration();

    /* GPIO Configuration */
    GPIO_Configuration();

    /* Compute the prescaler value */
    PrescalerValue = (uint16_t)(SystemCoreClock / 24000000) - 1;

    /* Time base configuration */
    TIM_InitTimBaseStruct(&TIM_TimeBaseStructure);
    TIM_TimeBaseStructure.Period    = 65535;
    TIM_TimeBaseStructure.Prescaler = PrescalerValue;
    TIM_TimeBaseStructure.ClkDiv    = 0;
    TIM_TimeBaseStructure.CntMode   = TIM_CNT_MODE_UP;

    TIM_InitTimeBase(TIM3, &TIM_TimeBaseStructure);

    /* Output Compare Toggle Mode configuration: Channel1 */
    TIM_InitOcStruct(&TIM_OCInitStructure);
    TIM_OCInitStructure.OcMode      = TIM_OCMODE_TOGGLE;
    TIM_OCInitStructure.OutputState = TIM_OUTPUT_STATE_ENABLE;
    TIM_OCInitStructure.Pulse       = CCR1_Val;
    TIM_OCInitStructure.OcPolarity  = TIM_OC_POLARITY_LOW;
    TIM_InitOc1(TIM3, &TIM_OCInitStructure);

    TIM_ConfigOc1Preload(TIM3, TIM_OC_PRE_LOAD_DISABLE);

    /* Output Compare Toggle Mode configuration: Channel2 */
    TIM_OCInitStructure.OutputState = TIM_OUTPUT_STATE_ENABLE;
    TIM_OCInitStructure.Pulse       = CCR2_Val;

    TIM_InitOc2(TIM3, &TIM_OCInitStructure);

    TIM_ConfigOc2Preload(TIM3, TIM_OC_PRE_LOAD_DISABLE);

    /* Output Compare Toggle Mode configuration: Channel3 */
    TIM_OCInitStructure.OutputState = TIM_OUTPUT_STATE_ENABLE;
    TIM_OCInitStructure.Pulse       = CCR3_Val;

    TIM_InitOc3(TIM3, &TIM_OCInitStructure);

    TIM_ConfigOc3Preload(TIM3, TIM_OC_PRE_LOAD_DISABLE);

    /* Output Compare Toggle Mode configuration: Channel4 */
    TIM_OCInitStructure.OutputState = TIM_OUTPUT_STATE_ENABLE;
    TIM_OCInitStructure.Pulse       = CCR4_Val;

    TIM_InitOc4(TIM3, &TIM_OCInitStructure);

    TIM_ConfigOc4Preload(TIM3, TIM_OC_PRE_LOAD_DISABLE);

    /* TIM enable counter */
    TIM_Enable(TIM3, ENABLE);

    /* TIM IT enable */
    TIM_ConfigInt(TIM3, TIM_INT_CC1 | TIM_INT_CC2 | TIM_INT_CC3 | TIM_INT_CC4, ENABLE);

    while (1)
    {
    }
}

/**
 * @brief  Configures the different system clocks.
 */
void RCC_Configuration(void)
{
    /* PCLK1 = HCLK/4 */
    RCC_ConfigPclk1(RCC_HCLK_DIV4);

    /* TIM3 clock enable */
    RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_TIM3, ENABLE);

    /* GPIOA clock enable */
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOA | RCC_APB2_PERIPH_GPIOB 
                          | RCC_APB2_PERIPH_AFIO,   ENABLE);
}

/**
 * @brief  Configure the TIM3 Pins.
 */
void GPIO_Configuration(void)
{
    GPIO_InitType GPIO_InitStructure;

    GPIO_InitStruct(&GPIO_InitStructure);
    /* GPIOA Configuration:TIM3 Channel1, 2, 3 and 4 as alternate function push-pull */
    GPIO_InitStructure.Pin        = GPIO_PIN_6;
    GPIO_InitStructure.GPIO_Mode  = GPIO_MODE_AF_PP;
    GPIO_InitStructure.GPIO_Current = GPIO_DC_LOW;
    GPIO_InitStructure.GPIO_Alternate = GPIO_AF2_TIM3;
    GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.Pin        = GPIO_PIN_7;
    GPIO_InitStructure.GPIO_Alternate = GPIO_AF2_TIM3;
    GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.Pin = GPIO_PIN_0;
    GPIO_InitStructure.GPIO_Alternate = GPIO_AF2_TIM3;
    GPIO_InitPeripheral(GPIOB, &GPIO_InitStructure);
    GPIO_InitStructure.Pin = GPIO_PIN_1;
    GPIO_InitStructure.GPIO_Alternate = GPIO_AF2_TIM3;
    GPIO_InitPeripheral(GPIOB, &GPIO_InitStructure);
}

/**
 * @brief  Configure the nested vectored interrupt controller.
 */
void NVIC_Configuration(void)
{
    NVIC_InitType NVIC_InitStructure;

    /* Enable the TIM3 global Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel                   = TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority           = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

#ifdef USE_FULL_ASSERT

/**
 * @brief  Reports the name of the source file and the source line number
 *         where the assert_param error has occurred.
 * @param file pointer to the source file name
 * @param line assert_param error line source number
 */
void assert_failed(const uint8_t* expr, const uint8_t* file, uint32_t line)
{
    /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

    while (1)
    {
    }
}

#endif
/**
 * @}
 */

/**
 * @}
 */
