/**
*     Copyright (c) 2022, Nations Technologies Inc.
* 
*     All rights reserved.
*
*     This software is the exclusive property of Nations Technologies Inc. (Hereinafter 
* referred to as NATIONS). This software, and the product of NATIONS described herein 
* (Hereinafter referred to as the Product) are owned by NATIONS under the laws and treaties
* of the People's Republic of China and other applicable jurisdictions worldwide.
*
*     NATIONS does not grant any license under its patents, copyrights, trademarks, or other 
* intellectual property rights. Names and brands of third party may be mentioned or referred 
* thereto (if any) for identification purposes only.
*
*     NATIONS reserves the right to make changes, corrections, enhancements, modifications, and 
* improvements to this software at any time without notice. Please contact NATIONS and obtain 
* the latest version of this software before placing orders.

*     Although NATIONS has attempted to provide accurate and reliable information, NATIONS assumes 
* no responsibility for the accuracy and reliability of this software.
* 
*     It is the responsibility of the user of this software to properly design, program, and test 
* the functionality and safety of any application made of this information and any resulting product. 
* In no event shall NATIONS be liable for any direct, indirect, incidental, special,exemplary, or 
* consequential damages arising in any way out of the use of this software or the Product.
*
*     NATIONS Products are neither intended nor warranted for usage in systems or equipment, any
* malfunction or failure of which may cause loss of human life, bodily injury or severe property 
* damage. Such applications are deemed, "Insecure Usage".
*
*     All Insecure Usage shall be made at user's risk. User shall indemnify NATIONS and hold NATIONS 
* harmless from and against all claims, costs, damages, and other liabilities, arising from or related 
* to any customer's Insecure Usage.

*     Any express or implied warranty with regard to this software or the Product, including,but not 
* limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement
* are disclaimed to the fullest extent permitted by law.

*     Unless otherwise explicitly permitted by NATIONS, anyone may not duplicate, modify, transcribe
* or otherwise distribute this software for any purposes, in whole or in part.
*
*     NATIONS products and technologies shall not be used for or incorporated into any products or systems
* whose manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations. 
* User shall comply with any applicable export control laws and regulations promulgated and administered by 
* the governments of any countries asserting jurisdiction over the parties or transactions.
**/

/**
*\*\file main.c
*\*\author Nations
*\*\version v1.0.0
*\*\copyright Copyright (c) 2022, Nations Technologies Inc. All rights reserved.
**/
#include "main.h"

TIM_TimeBaseInitType TIM_TimeBaseStructure;
OCInitType TIM_OCInitStructure;
__IO uint16_t CCR1_Val  = 40961;
__IO uint16_t CCR2_Val  = 27309;
__IO uint16_t CCR3_Val  = 13654;
__IO uint16_t CCR4_Val  = 6826;
uint16_t PrescalerValue = 0;

/**
*\*\name    main.
*\*\fun     main program.
*\*\param   none
*\*\return  none 
**/
int main(void)
{
    /* System Clocks Configuration */
    RCC_Configuration();

    /* NVIC Configuration */
    NVIC_Configuration();
    
    /* GPIO Configuration */
    GPIO_Configuration();
    
    /* ---------------------------------------------------------------
    TIM2 Configuration: Output Compare Timing Mode:
    TIM2 counter clock at 6 MHz
    CC1 update rate = TIM2 counter clock / CCR1_Val
    CC2 update rate = TIM2 counter clock / CCR2_Val
    CC3 update rate = TIM2 counter clock / CCR3_Val
    CC4 update rate = TIM2 counter clock / CCR4_Val
    --------------------------------------------------------------- */

    /* Compute the prescaler value */
    PrescalerValue = (uint16_t)((SystemCoreClock/2)/ 16000000) - 1;

    /* Time base configuration */
    TIM_InitTimBaseStruct(&TIM_TimeBaseStructure);
    TIM_TimeBaseStructure.Period        = 65535;
    TIM_TimeBaseStructure.Prescaler     = 0;
    TIM_TimeBaseStructure.ClkDiv        = TIM_CLK_DIV1;
    TIM_TimeBaseStructure.CounterMode   = TIM_CNT_MODE_UP;

    TIM_InitTimeBase(TIM2, &TIM_TimeBaseStructure);

    /* Prescaler configuration */
    TIM_ConfigPrescaler(TIM2, PrescalerValue, TIM_PSC_RELOAD_MODE_IMMEDIATE);

    /* Output Compare Timing Mode configuration: Channel1 */
    TIM_InitOcStruct(&TIM_OCInitStructure);
    TIM_OCInitStructure.OCMode      = TIM_OCMODE_TIMING;
    TIM_OCInitStructure.OutputState = TIM_OUTPUT_STATE_ENABLE;
    TIM_OCInitStructure.Pulse       = CCR1_Val;
    TIM_OCInitStructure.OCPolarity  = TIM_OC_POLARITY_HIGH;

    TIM_InitOc1(TIM2, &TIM_OCInitStructure);

    TIM_ConfigOc1Preload(TIM2, TIM_OC_PRE_LOAD_DISABLE);

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

    TIM_InitOc2(TIM2, &TIM_OCInitStructure);

    TIM_ConfigOc2Preload(TIM2, TIM_OC_PRE_LOAD_DISABLE);

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

    TIM_InitOc3(TIM2, &TIM_OCInitStructure);

    TIM_ConfigOc3Preload(TIM2, TIM_OC_PRE_LOAD_DISABLE);

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

    TIM_InitOc4(TIM2, &TIM_OCInitStructure);

    TIM_ConfigOc4Preload(TIM2, TIM_OC_PRE_LOAD_DISABLE);

    /* TIM IT enable */
    TIM_ConfigInt(TIM2, TIM_INT_CC1 | TIM_INT_CC2 | TIM_INT_CC3 | TIM_INT_CC4, ENABLE);

    /* TIM2 enable counter */
    TIM_Enable(TIM2, ENABLE);   
    
    while (1);
}

/**
*\*\name    RCC_Configuration.
*\*\fun     Configures the different system clocks.
*\*\param   none
*\*\return  none 
**/
void RCC_Configuration(void)
{
    /* PCLK1 = HCLK/4 */
    RCC_ConfigPclk2(RCC_HCLK_DIV4);    
    
    /* TIMx, GPIOx and AFIO clocks enable */
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_TIM2 | RCC_APB2_PERIPH_GPIOD | 
                            RCC_APB2_PERIPH_GPIOC | RCC_APB2_PERIPH_AFIO,ENABLE);
}

/**
*\*\name    GPIO_Configuration.
*\*\fun     Configures the GPIO pins.
*\*\param   none
*\*\return  none 
**/
void GPIO_Configuration(void)
{
    GPIO_InitType GPIO_InitStructure;

    GPIO_InitStruct(&GPIO_InitStructure);
    /* GPIOx Configuration: output Pin */
    GPIO_InitStructure.Pin        = GPIO_PIN_6 | GPIO_PIN_7;
    GPIO_InitStructure.GPIO_Mode  = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStructure.GPIO_Slew_Rate = GPIO_SLEW_RATE_SLOW;
    GPIO_InitPeripheral(GPIOC, &GPIO_InitStructure);

    GPIO_InitStructure.Pin        = GPIO_PIN_5 | GPIO_PIN_12;
    GPIO_InitStructure.GPIO_Mode  = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStructure.GPIO_Slew_Rate = GPIO_SLEW_RATE_SLOW;
    GPIO_InitPeripheral(GPIOD, &GPIO_InitStructure);
}

/**
*\*\name    NVIC_Configuration.
*\*\fun     Configures the nested vectored interrupt controller.
*\*\param   none
*\*\return  none 
**/
void NVIC_Configuration(void)
{
    NVIC_InitType NVIC_InitStructure;

    /* Enable the TIMx Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel                   = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority           = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}


