#include "wifi.h"

#include "stm32f10x.h"

void wifi_init() {
    float temp;
    unsigned short mantissa;
    unsigned short fraction;
    temp = (float)(WIFI_PCLK2 * 1000000) / (WIFI_BOUND * 16);
    mantissa = temp;
    fraction = (temp - mantissa) * 16;
    mantissa <<= 4;
    mantissa += fraction;

    RCC->APB2ENR |= RCC_APB2ENR_IOPBEN;		//GPIOB Enable
    RCC->APB1ENR |= RCC_APB1ENR_USART3EN;	//USART3 Enable

    GPIOB->CRH &= 0xFFFF00FF;
    GPIOB->CRH |= 0x00008B00;

    RCC->APB1RSTR |= RCC_APB1RSTR_USART3RST;
    RCC->APB1RSTR &= ~RCC_APB1RSTR_USART3RST;

    USART3->BRR = mantissa;
    USART3->CR1 |= 0x200C;

    USART3->CR1 |= 1<<8;
    USART3->CR1 |= 1<<5;

    USART3->SR;     //Read Reg SR to Clean TXE and TE,(Reset value: 0x00C0)
}

void wifi_sendSingleByte(unsigned char cmd) {
    USART3->DR = cmd;
    while((USART3->SR & 0x40) == 0);
}

void wifi_sendData(char *cmd) {
	while(*cmd)
		wifi_sendSingleByte(*cmd++);
}

void wifi_sendCmd(char *cmd) {
    wifi_sendData(cmd);
    wifi_sendSingleByte(0x0D);
    wifi_sendSingleByte(0x0A);
}

void wifi_Config() {
    wifi_init();
    wifi_sendCmd("AT+CWMODE=2");
    delay(50);
    wifi_sendCmd("AT+CIPMUX=1");
    delay(50);
    wifi_sendCmd("AT+CIPSERVER=1,80");
    delay(50);
}