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#include "debug.h"

/* Global define */
_Bool Sx_Op_Flag = 0;
float Temperature = 0.0;
uint16_t iData_SPI=0;


/* Global Variable */
uint8_t val = 0;

void EXTI7_0_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));

void EXTI7_0_IRQHandler(void){

    if(EXTI_GetITStatus(EXTI_Line2)!=RESET){
        printf("External Interrup\n\r");
        //EXTI_ClearITPendingBit(EXTI_Line2);
        EXTI_ClearFlag(EXTI_Line2);
    }
}

void ExtInt_Init(void){
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    EXTI_InitTypeDef EXTI_InitStructure = {0};
    NVIC_InitTypeDef NVIC_InitStructure = {0};

    RCC_APB1PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource2);
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_InitStructure.EXTI_Line = EXTI_Line2;

    EXTI_Init(&EXTI_InitStructure);


    NVIC_InitStructure.NVIC_IRQChannel = EXTI7_0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

    NVIC_Init(&NVIC_InitStructure);

}
/*********************************************************************
 * @fn      USARTx_CFG
 *
 * @brief   Initializes the USART2 & USART3 peripheral.
 *
 * @return  none
 */
void USARTx_CFG(void)
{
    GPIO_InitTypeDef  GPIO_InitStructure = {0};
    USART_InitTypeDef USART_InitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_USART1, ENABLE);

    /* USART1 TX-->D.5   RX-->D.6 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOD, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);
}

/*  SPI CONFIGURATION */
/*
 * PC5 -> SCK
 * PC6 -> MOSI
 * PC7 -> MISO
 * PC0 -> NSS
 *
 * */

void SPI_CFG(void){
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    SPI_InitTypeDef SPI_InitStructure = {0};
    NVIC_InitTypeDef NVIC_InitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_SPI1, ENABLE);
    /* Configurate inputs*/
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

    SPI_Init(SPI1, &SPI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI7_0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;

    NVIC_Init(&NVIC_InitStructure);
    // NSS
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    GPIO_WriteBit(GPIOC, GPIO_Pin_0,Bit_SET);
    SPI_Cmd( SPI1, ENABLE );
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    Delay_Init();
    USART_Printf_Init(115200);
    printf("SystemClk:%d\r\n",SystemCoreClock);

    USARTx_CFG();
    ExtInt_Init();
    SPI_CFG();
    while(1)
    {

        if (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)== SET){
            printf("IF \n");
            //GPIO_WriteBit(GPIOB, GPIO_Pin_12,Bit_SET);
            //Delay_Ms(30);
            GPIO_WriteBit(GPIOC, GPIO_Pin_0,Bit_RESET);

            SPI_I2S_SendData(SPI1, 0xAA0A);
            while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE)== RESET);
            GPIO_WriteBit(GPIOC, GPIO_Pin_0,Bit_SET);
            printf("Data in SPI1");
            iData_SPI = SPI_I2S_ReceiveData(SPI1);
            Sx_Op_Flag = (iData_SPI & 0x4)>>2;
            if(Sx_Op_Flag){
                printf("No sensor\n\r");
            }else{
                 Temperature = 0.25 * (float)(iData_SPI>>3);
                 printf(" %2.2f C \r\n",Temperature);
            }
        }
        Delay_Ms(400);
    }
}