#define HSE_VALUE ((uint32_t)8000000) /* STM32 discovery uses a 8Mhz external crystal */

#include "stm32f4xx_conf.h"
#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_exti.h"
#include "stm32f4xx_usart.h"
#include "usbd_cdc_core.h"
#include "usbd_usr.h"
#include "usbd_desc.h"
#include "usbd_cdc_vcp.h"
#include "usb_dcd_int.h"
#include "misc.h"

volatile uint32_t ticker, downTicker;

/*
 * The USB data must be 4 byte aligned if DMA is enabled. This macro handles
 * the alignment, if necessary (it's actually magic, but don't tell anyone).
 */
__ALIGN_BEGIN USB_OTG_CORE_HANDLE  USB_OTG_dev __ALIGN_END;


void init();
void ColorfulRingOfDeath(void);

/*
 * Define prototypes for interrupt handlers here. The conditional "extern"
 * ensures the weak declarations from startup_stm32f4xx.c are overridden.
 */
#ifdef __cplusplus
 extern "C" {
#endif

void SysTick_Handler(void);
void NMI_Handler(void);
void HardFault_Handler(void);
void MemManage_Handler(void);
void BusFault_Handler(void);
void UsageFault_Handler(void);
void SVC_Handler(void);
void DebugMon_Handler(void);
void PendSV_Handler(void);
void OTG_FS_IRQHandler(void);
void OTG_FS_WKUP_IRQHandler(void);

#ifdef __cplusplus
}
#endif




int main(void)
{
    /*-------------------------------------------MOJE-----------------------------*/
    //RCC
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE); //wlaczenietaktowaniawybranegoportu
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);//wlaczenietaktowaniawybranegoukaduUSART

    //Tx
    GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_USART3);
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
    GPIO_Init(GPIOC,&GPIO_InitStructure);

    //Rx
    GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_USART3);
    GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Pin=GPIO_Pin_11;
    GPIO_Init(GPIOC,&GPIO_InitStructure);

    //USART
    USART_InitTypeDef USART_InitStructure;
    USART_InitStructure.USART_BaudRate=115200; // predkosc transmisji (mozliwe standardowe opcje: 9600, 19200, 38400, 57600,115200,...)
    USART_InitStructure.USART_WordLength=USART_WordLength_8b; //dlugosc slowa(USART_WordLength_8blubUSART_WordLength_9b)
    USART_InitStructure.USART_StopBits=USART_StopBits_1; // (USART_StopBits_2,USART_StopBits_1_5)
    USART_InitStructure.USART_Parity=USART_Parity_No; // sprawdzanie parzystoci (USART_Parity_No, USART_Parity_Even,USART_Parity_Odd)
    USART_InitStructure.USART_HardwareFlowControl; // sprztowa kontrola przepywu (USART_HardwareFlowControl_None, USART_HardwareFlowControl_RTS, USART_HardwareFlowControl_CTS, USART_HardwareFlowControl_RTS_CTS)
    USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx; //trybnadawania/odbierania(USART_Mode_Rx,USART_Mode_Rx)
    USART_Init(USART3,&USART_InitStructure);
    USART_Cmd(USART3,ENABLE);

    //NVIC
    NVIC_InitTypeDef NVIC_InitStructure;     //strukturadokonfiguracjikontroleraNVIC
    USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);
    NVIC_InitStructure.NVIC_IRQChannel=USART3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
    NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
    NVIC_Init(&NVIC_InitStructure); //konfiguracjakontroleraprzerwan
    NVIC_EnableIRQ(USART3_IRQn);    //wlaczenieprzerwanodukladuUSART


    /*---------------------------------------------------------------------------*/

    /* Set up the system clocks */
    SystemInit();

    /* Initialize USB, IO, SysTick, and all those other things you do in the morning */
    init();


    while (1)
    	{
    		/* Blink the orange LED at 1Hz */
    		if (500 == ticker)
    		{
    			GPIOD->BSRRH = GPIO_Pin_13;
    		}
    		else if (1000 == ticker)
    		{
    			ticker = 0;
    			GPIOD->BSRRL = GPIO_Pin_13;
    		}


    		/* If there's data on the virtual serial port:
    		 *  - Echo it back
    		 *  - Turn the green LED on for 10ms
    		 */
    		uint8_t theByte;
    		if (VCP_get_char(&theByte))
    		{


    			//czekajnaoprónieniebuforawyjciowego
    			while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)==RESET);

    			USART_SendData(USART3, theByte);

    			while(USART_GetFlagStatus(USART3,USART_FLAG_TC)==RESET);


    			GPIOD->BSRRL = GPIO_Pin_12;
    			downTicker = 10;
    		}
    		if (0 == downTicker)
    		{
    			GPIOD->BSRRH = GPIO_Pin_12;
    		}
    	}


    return 0;
}


void init()
{
    /* STM32F4 discovery LEDs */
    GPIO_InitTypeDef LED_Config;

    /* Always remember to turn on the peripheral clock...  If not, you may be up till 3am debugging... */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
    LED_Config.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14| GPIO_Pin_15;
    LED_Config.GPIO_Mode = GPIO_Mode_OUT;
    LED_Config.GPIO_OType = GPIO_OType_PP;
    LED_Config.GPIO_Speed = GPIO_Speed_25MHz;
    LED_Config.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOD, &LED_Config);



    /* Setup SysTick or CROD! */
    if (SysTick_Config(SystemCoreClock / 1000))
    {
        ColorfulRingOfDeath();
    }


    /* Setup USB */
    USBD_Init(&USB_OTG_dev,
                USB_OTG_FS_CORE_ID,
                &USR_desc,
                &USBD_CDC_cb,
                &USR_cb);

    return;
}

/*
 * Call this to indicate a failure.  Blinks the STM32F4 discovery LEDs
 * in sequence.  At 168Mhz, the blinking will be very fast - about 5 Hz.
 * Keep that in mind when debugging, knowing the clock speed might help
 * with debugging.
 */
void ColorfulRingOfDeath(void)
{
    uint16_t ring = 1;
    while (1)
    {
        uint32_t count = 0;
        while (count++ < 500000);

        GPIOD->BSRRH = (ring << 12);
        ring = ring << 1;
        if (ring >= 1<<4)
        {
            ring = 1;
        }
        GPIOD->BSRRL = (ring << 12);
    }
}

/*
 * Interrupt Handlers
 */

void SysTick_Handler(void)
{
    ticker++;
    if (downTicker > 0)
    {
        downTicker--;
    }
}

void NMI_Handler(void)       {}
void HardFault_Handler(void) { ColorfulRingOfDeath(); }
void MemManage_Handler(void) { ColorfulRingOfDeath(); }
void BusFault_Handler(void)  { ColorfulRingOfDeath(); }
void UsageFault_Handler(void){ ColorfulRingOfDeath(); }
void SVC_Handler(void)       {}
void DebugMon_Handler(void)  {}
void PendSV_Handler(void)    {}

void OTG_FS_IRQHandler(void)
{
  USBD_OTG_ISR_Handler (&USB_OTG_dev);
}

void OTG_FS_WKUP_IRQHandler(void)
{
  if(USB_OTG_dev.cfg.low_power)
  {
    *(uint32_t *)(0xE000ED10) &= 0xFFFFFFF9 ;
    SystemInit();
    USB_OTG_UngateClock(&USB_OTG_dev);
  }
  EXTI_ClearITPendingBit(EXTI_Line18);
}

uint8_t usartGetChar(void)
{
//czekajnaodebraniedanych
while(USART_GetFlagStatus(USART3,USART_FLAG_RXNE)==RESET);
return USART_ReceiveData(USART3);
}

void USART3_IRQHandler(void)
{
//sprawdzenieflagizwiazanejzodebraniemdanychprzezUSART
	if(USART_GetITStatus(USART3,USART_IT_RXNE)!=RESET)
	{
		usartGetChar();
		VCP_put_char(USART3->DR);
	}
}