/**
*     Copyright (c) 2025, NSING Technologies Inc.
* 
*     All rights reserved.
*
*     This software is the exclusive property of NSING Technologies Inc. (Hereinafter 
* referred to as NSING). This software, and the product of NSING described herein 
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* of the People's Republic of China and other applicable jurisdictions worldwide.
*
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* intellectual property rights. Names and brands of third party may be mentioned or referred 
* thereto (if any) for identification purposes only.
*
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* improvements to this software at any time without notice. Please contact NSING and obtain 
* the latest version of this software before placing orders.

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* 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 NSING 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.
*
*     NSING 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".
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**/

/**
*\*\file main.c
*\*\author NSING
*\*\version v1.0.0
*\*\copyright Copyright (c) 2025, NSING Technologies Inc. All rights reserved.
**/
#include "main.h"

TIM_TimeBaseInitType TIM_TimeBaseStructure;
TIM_ICInitType TIM_ICInitStructure;
OCInitType TIM_OCInitStructure;
uint16_t PrescalerValue = 0;
uint16_t gSendTrigEn = 0;

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

    /* GPIO Configuration */
    GPIO_Configuration();

     /* 
     TIMx configuration: One Pulse mode 
     The external signal is connected to TIMx_CH2 pin ,
     The Rising edge is used as active edge,
     The One Pulse signal is output on TIMx_CH1 pin 
     The Pulse defines the delay value
     The (Period -  Pulse) defines the One Pulse value.
     TIMxCLK = SystemCoreClock/2, we want to get TIMx counter clock at x Hz:
     - Prescaler = (TIMxCLK / TIMx counter clock) - 1
     The Autoreload value is TIMx->AR, so the maximum frequency value
     to trigger the TIMx input is (TIMx counter clock)/(TIMx->AR).

     One Pulse value = (Period - Pulse) / TIMx counter clock .
     */   
    
     /* Compute the prescaler value */
    PrescalerValue = (uint16_t)((SystemCoreClock/2) / 6000000) - 1;
    /* Time base configuration */
    TIM_InitTimBaseStruct(&TIM_TimeBaseStructure);
    TIM_TimeBaseStructure.Period        = 65535;
    TIM_TimeBaseStructure.Prescaler     = PrescalerValue;
    TIM_TimeBaseStructure.ClkDiv        = TIM_CLK_DIV1;
    TIM_TimeBaseStructure.CounterMode   = TIM_CNT_MODE_UP;

    TIM_InitTimeBase(TIMx, &TIM_TimeBaseStructure);   

    /* TIMx PWM2 Mode configuration: Channel1 */
    TIM_InitOcStruct(&TIM_OCInitStructure);
    TIM_OCInitStructure.OCMode      = TIM_OCMODE_PWM2;
    TIM_OCInitStructure.OutputState = TIM_OUTPUT_STATE_ENABLE;
    TIM_OCInitStructure.Pulse       = 16383;
    TIM_OCInitStructure.OCPolarity  = TIM_OC_POLARITY_HIGH;

    TIM_InitOc1(TIMx, &TIM_OCInitStructure);

    /* TIMx configuration in Input Capture Mode */

    TIM_InitIcStruct(&TIM_ICInitStructure);

    TIM_ICInitStructure.Channel     = TIM_CH_2;
    TIM_ICInitStructure.ICPolarity  = TIM_IC_POLARITY_RISING;
    TIM_ICInitStructure.ICSelection = TIM_IC_SELECTION_DIRECTTI;
    TIM_ICInitStructure.ICPrescaler = TIM_IC_PSC_DIV1;
    TIM_ICInitStructure.ICFilter    = 0;

    TIM_ICInit(TIMx, &TIM_ICInitStructure);
    
    /* One Pulse Mode selection */
    TIM_SelectOnePulseMode(TIMx, TIM_OPMODE_SINGLE);

    /* Input Trigger selection */
    TIM_SelectInputTrig(TIMx, TIM_TRIG_SEL_TI2FP2);

    /* Slave Mode selection: Trigger Mode */
    TIM_SelectSlaveMode(TIMx, TIM_SLAVE_MODE_TRIG);

    while (1)
    {
        SendOneTrig();
    }
}

/**
*\*\name    RCC_Configuration.
*\*\fun     Configures the different system clocks.
*\*\param   none
*\*\return  none 
**/
void RCC_Configuration(void)
{
    /* TIMx, GPIOx and AFIO clocks enable */
    RCC_EnableAPB1PeriphClk(TIMx_CLK,ENABLE);
    RCC_EnableAHB1PeriphClk(TIMx_CH1_GPIO_CLK | TIMx_CH2_GPIO_CLK,ENABLE);
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPHEN_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: Pin of TIMx */
    GPIO_InitStructure.Pin        = TIMx_CH1_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode  = GPIO_MODE_AF_PP;
    GPIO_InitStructure.GPIO_Slew_Rate = GPIO_SLEW_RATE_SLOW;
    GPIO_InitStructure.GPIO_Alternate = TIMx_CH1_GPIO_AF;
    GPIO_InitPeripheral(TIMx_CH1_GPIO_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.Pin        = TIMx_CH2_GPIO_PIN;
    GPIO_InitStructure.GPIO_Alternate = TIMx_CH2_GPIO_AF;
    GPIO_InitPeripheral(TIMx_CH2_GPIO_PORT, &GPIO_InitStructure);
    
    /* GPIOx Configuration: output Pin */
    GPIO_InitStructure.Pin        = GPIO_PIN_3;
    GPIO_InitStructure.GPIO_Mode  = GPIO_MODE_OUTPUT_PP;
    GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);    
}

/**
*\*\name    SendOneTrig.
*\*\fun     Send one trig byself.
*\*\param   none
*\*\return  none 
**/
void SendOneTrig(void)
{
    if (gSendTrigEn)
    {
        gSendTrigEn = 0;
        GPIO_SetBits(GPIOA, GPIO_PIN_3);
        {
            uint32_t i=0;
            while (i++ < 10)
                ;
        }
        GPIO_ResetBits(GPIOA, GPIO_PIN_3);
    }
}

