#include "stm32f4xx_conf.h"
#include "stm32f4xx_exti.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_usart.h"
#include "stm32f4xx.h"
#include "stm32f4_discovery.h"
#include <string.h>
#include <stdio.h>

//ESP8266 Rx -> STM32 PC10
//ESP8266 Tx -> STM32 PC11
//ESP8266 CH_PD -> STM32 3V
//ESP8266 VCC -> STM32 3V
//ESP8266 GND -> STM32 GND
//192.168.4.1
void Delay_us(volatile uint32_t delay);
void USART3Init(void);
void startServer(void);
void connectToAP(char* name, char* password);
void startclient(void);
void USART_Send(volatile char *c);
void connectToWiFi(void);

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

//const char* pname = "nazawa";
//const char* passwd = "passwd";
const char* ip = "ip";

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

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 startServer(void)
{
    //Delay_us(5000);
    USART_Send("AT+CWMODE=3\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);
    //Delay_us(200000);
    USART_Send("AT+CIPMUX=1\r\n");          //Enable multiple connections (required)
    //Delay_us(200000);
    USART_Send("AT+CIPSERVER=1,80\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 USART3_IRQHandler(void)
{
    USART_Send("AT+CWJAP=\"Redmi\",\"asdfghjk\"\r\n");
    char buff;

    if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
    {
        buff= USART3->DR;
        switch(buff)
        {

        case 49:
        {
            //USART_Send("AT+CIPSEND=1,2\r\n");
            //USART_Send("AT+CIPSEND="1\n");
            break;
        }
        case 50:
        {
            //USART_Send("AT+CIPSEND=2,2\r\n");
            //USART_Send("AT+CIPSEND="2\n");
                    break;
        }
        default:  break;
        }

    }

}

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);
        }
}
//void USART_Send(char *c)
//{
//  while(*c)
//  {
//      if (*c != 0)
//      {
//          USART_SendData(USART3, *c);
//          *c++;
//      }
//  }
//}


void connectToWiFi(void)
{

    char buffer[64];
    int n = sprintf(buffer,"AT+CIPSTART=\"TCP\",\"%s\",1001\r\n",ip);
    USART_Send(buffer);
    //Delay_us(1000000);

}

int main()
{
    USART3Init();
    //startServer();
    //USART_Send("AT+RST\r\n");
    //Delay_us(10000);
    USART_Send("AT+CWMODE=1\r\n");
    //Delay_us(1000);
    //connectToAP("Redmi","asdfghjk");
    //Delay_us(1000);
    //USART_Send("AT+CWJAP=\"Redmi\",\"asdfghjk\"\r\n");
    //USART_Send("AT+CIPSERVER=1,80\r\n");
    //Delay_us(20000);
}