#include "stm32f4xx.h"
#include "stm32f4_discovery.h"

//ESP8266 Rx -> STM32 PC10
//ESP8266 Tx -> STM32 PC11
//ESP8266 CH_PD -> STM32 3V
//ESP8266 VCC -> STM32 3V
//ESP8266 GND -> STM32 GND

const char* apname = "nazawa";
const char* appasswd = "asdfghjkl";
const int apport = 80;

const char* name = "nazawa";
const char* passwd = "passwd";
const char* ip = "ip";
const int wifiport = "portport";

void Delay_us(volatile uint32_t delay)
{
    delay*=24;
    while(delay--);
}

void startServer(void)
{
    //Delay_us(5000);
    USART_Send("AT+CWMODE=2\r\n");      // Access Point
    //Delay_us(200000);
    //char buffer[64];
    //int n = sprintf(buffer,"AT+CWSAP=\"%s\",\"%s\",4,2\r\n",name,passwd);
    //USART_Send(buffer);
    //USART_Send("AT+CWSAP=\"%s\",\"%s\",3,2\r\n",apname,appasswd);
    //Delay_us(200000);
    USART_Send("AT+CIPMUX=1\r\n");          //Enable multiple connections (required)
    //Delay_us(200000);
    USART_Send("AT+CIPSERVER=1,23\r\n");
    //Delay_us(200000);
}

void connectToAP(char* name, char* password)
{
    char buffer[64];
    int n = sprintf(buffer,"AT+CWJAP=\"%s\",\"%s\"\r\n",name,password);
    USART_Send(buffer);
}

void startclient(void)
{

    USART_Send("AT+CWMODE=1\r\n");
    //Delay_us(200000);
    USART_Send("AT+CIPMUX=0\r\n");
    //Delay_us(2000000);

}

void USART3Init(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);

    USART_InitTypeDef USART_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_Rx | USART_Mode_Tx;
    USART_Init(USART3, &USART_InitStructure);

    NVIC_InitTypeDef NVIC_InitStructure;
    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
    NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    NVIC_EnableIRQ(USART3_IRQn);

    USART_Cmd(USART3, ENABLE);
}

void USART3_IRQHandler(void)
{
    char a;

    if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
    {
        a= USART3->DR;
        if (a==4)
        {
            //nie wiem zapal diod
        }
    }

}

void USART_Send(volatile char *c)
{
    int length = strlen(c);
        for(int i=0; i<length; i++) {
            USART_SendData(USART3, c[i]);
            //Delay_us(500);
        }
}


//uint8_t usartGetChar(void)
//{
//    // czekaj na odebranie danych
//    while (USART_GetFlagStatus(USART3, USART_FLAG_RXNE) == RESET);
//
//    return USART_ReceiveData(USART3);
//}

void connectToWiFi(void)
{

    char buffer[64];
    int n = sprintf(buffer,"AT+CIPSTART=\"TCP\",\"%s\",%d\r\n",ip,wifiport);
    USART_Send(buffer);
    //Delay_us(1000000);

}

int main()
{
    USART3Init();
    startServer();
    //connectToAP("Redmi","asdfghjk");
//  Delay_us(20000000);
    return 0;
}