探索使用以太网（ETH），搭建一个简单的本地HTTP服务器

#include "lwip/debug.h"

#include "httpd.h"

#include "lwip/tcp.h"

#include "fs.h"

#include "main.h"

#include "Board.h"



#include <string.h>

#include <stdlib.h>



tSSIHandler ADC_Page_SSI_Handler;

uint32_t ADC_not_configured=1;



/* we will use character "t" as tag for CGI */

char const* TAGCHAR="t";

char const** TAGS=&TAGCHAR;



/* CGI handler for LED control */ 

const char * LEDS_CGI_Handler(int iIndex, int iNumParams, char *pcParam[], char *pcValue[]);



/* Html request for "/leds.cgi" will start LEDS_CGI_Handler */

const tCGI LEDS_CGI={"/leds.cgi", LEDS_CGI_Handler};



/* Cgi call table, only one CGI used */

tCGI CGI_TAB[1];





/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  Configures the ADC.

  * @param  None

  * @retval None

  */

static void ADC_Configuration(void)

{

        ADC_Config_T adcConfig;

        ADC_CommonConfig_T adcCommonConfig;

        GPIO_Config_T gpioConfig;

        

        RCM_EnableAPB2PeriphClock(RCM_APB2_PERIPH_ADC3);

        RCM_EnableAHB1PeriphClock(RCM_AHB1_PERIPH_GPIOF);

        

        gpioConfig.pin = GPIO_PIN_9;

        gpioConfig.mode = GPIO_MODE_AN;

        gpioConfig.pupd = GPIO_PUPD_NOPULL;

        GPIO_Config(GPIOF,&gpioConfig);

        

        ADC_CommonConfigStructInit(&adcCommonConfig);

        adcCommonConfig.mode = ADC_MODE_INDEPENDENT;

        adcCommonConfig.prescaler = ADC_PRESCALER_DIV6;

        adcCommonConfig.accessMode = ADC_ACCESS_MODE_DISABLED;

        adcCommonConfig.twoSampling = ADC_TWO_SAMPLING_5CYCLES;

        ADC_CommonConfig(&adcCommonConfig);

        

        ADC_ConfigStructInit(&adcConfig);

        adcConfig.resolution = ADC_RESOLUTION_12BIT;

        adcConfig.scanConvMode = DISABLE;

        adcConfig.continuousConvMode = ENABLE;

        adcConfig.extTrigEdge = ADC_EXT_TRIG_EDGE_NONE;

        adcConfig.dataAlign = ADC_DATA_ALIGN_RIGHT;

        adcConfig.nbrOfChannel = 1;

        ADC_Config(ADC3,&adcConfig);

        

        ADC_ConfigRegularChannel(ADC3,ADC_CHANNEL_7,1,ADC_SAMPLETIME_56CYCLES);

        ADC_Enable(ADC3);



    /* ADC3 regular Software Start Conv */ 

    ADC_SoftwareStartConv(ADC3);

}



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  ADC_Handler : SSI handler for ADC page 

  */

u16_t ADC_Handler(int iIndex, char *pcInsert, int iInsertLen)

{

  /* We have only one SSI handler iIndex = 0 */

  if (iIndex ==0)

  {  

    char Digit1=0, Digit2=0, Digit3=0, Digit4=0; 

    uint32_t ADCVal = 0;        



     /* configure ADC if not yet configured */

     if (ADC_not_configured ==1)       

     {

        ADC_Configuration();

        ADC_not_configured=0;

     }

     

     /* get ADC conversion value */

     ADCVal = ADC_ReadConversionValue(ADC3);

     

     /* convert to Voltage,  step = 0.8 mV */

     ADCVal = (uint32_t)(ADCVal * 0.8);  

         printf("ADC Value: %d\r\n",ADCVal);

     

     /* get digits to display */

     

     Digit1= ADCVal/1000;

     Digit2= (ADCVal-(Digit1*1000))/100 ;

     Digit3= (ADCVal-((Digit1*1000)+(Digit2*100)))/10;

     Digit4= ADCVal -((Digit1*1000)+(Digit2*100)+ (Digit3*10));

        

     /* prepare data to be inserted in html */

     *pcInsert       = (char)(Digit1+0x30);

     *(pcInsert + 1) = (char)(Digit2+0x30);

     *(pcInsert + 2) = (char)(Digit3+0x30);

     *(pcInsert + 3) = (char)(Digit4+0x30);

    

    /* 4 characters need to be inserted in html*/

    return 4;

  }

  return 0;

}



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  CGI handler for LEDs control 

  */

const char * LEDS_CGI_Handler(int iIndex, int iNumParams, char *pcParam[], char *pcValue[])

{

  uint32_t i=0;

  

  /* We have only one SSI handler iIndex = 0 */

  if (iIndex==0)

  {

    /* All leds off */

          

    APM_TINY_LEDOff(LED2);

    APM_TINY_LEDOff(LED3);

    

    /* Check cgi parameter : example GET /leds.cgi?led=2&led=4 */

    for (i=0; i<iNumParams; i++)

    {

      /* check parameter "led" */

      if (strcmp(pcParam[i] , "led")==0)   

      {

        /* switch led2 ON if 2 */

        if(strcmp(pcValue[i], "2") ==0) 

          APM_TINY_LEDOn(LED2);

        

        /* switch led3 ON if 3 */

        else if(strcmp(pcValue[i], "3") ==0) 

          APM_TINY_LEDOn(LED3);

      }

    }

  }

  /* uri to send after cgi call*/

  return "/APM32F407LED.html";  

}



/**

 * Initialize SSI handlers

 */

void httpd_ssi_init(void)

{  

  /* configure SSI handlers (ADC page SSI) */

  http_set_ssi_handler(ADC_Handler, (char const **)TAGS, 1);

}



/**

 * Initialize CGI handlers

 */

void httpd_cgi_init(void)

{ 

  /* configure CGI handlers (LEDs control CGI) */

  CGI_TAB[0] = LEDS_CGI;

  http_set_cgi_handlers(CGI_TAB, 1);

}

int main(void)

{

    char LCDDisplayBuf[100] = {0};



    struct ip_addr DestIPaddr;



    uint8_t flag = 0;



    USART_Config_T usartConfig;



    /* User config the different system Clock */

    UserRCMClockConfig();



    /* Configure SysTick */

    ConfigSysTick();



    /* Configure USART */

    usartConfig.baudRate = 115200;

    usartConfig.wordLength = USART_WORD_LEN_8B;

    usartConfig.stopBits = USART_STOP_BIT_1;

    usartConfig.parity = USART_PARITY_NONE ;

    usartConfig.mode = USART_MODE_TX_RX;

    usartConfig.hardwareFlow = USART_HARDWARE_FLOW_NONE;



    APM_BOARD_COMInit(COM1,&usartConfig);



    /* Configures LED2 and LED3 */

    APM_BOARD_LEDInit(LED2);

    APM_BOARD_LEDInit(LED3);



    /* KEY init*/

    APM_BOARD_PBInit(BUTTON_KEY1, BUTTON_MODE_GPIO);

    APM_BOARD_PBInit(BUTTON_KEY2, BUTTON_MODE_GPIO);



        printf("This is a Demo!\r\n");



    /* Configure ethernet (GPIOs, clocks, MAC, DMA) */

    ConfigEthernet();



    /* Initilaize the LwIP stack */

    LwIP_Init();

        

        httpd_init();



    /* Use Com printf static IP address*/

    sprintf(LCDDisplayBuf,"TINY board Static IP address \r\n");

    printf("%s",LCDDisplayBuf);



    sprintf(LCDDisplayBuf,"IP: %d.%d.%d.%d \r\n",

    IP_ADDR0,

    IP_ADDR1,

    IP_ADDR2,

    IP_ADDR3);

    printf("%s",LCDDisplayBuf);



    sprintf(LCDDisplayBuf,"NETMASK: %d.%d.%d.%d \r\n",

    NETMASK_ADDR0,

    NETMASK_ADDR1,

    NETMASK_ADDR2,

    NETMASK_ADDR3);

    printf("%s",LCDDisplayBuf);



    sprintf(LCDDisplayBuf,"Gateway: %d.%d.%d.%d \r\n",

    GW_ADDR0,

    GW_ADDR1,

    GW_ADDR2,

    GW_ADDR3);

    printf("%s",LCDDisplayBuf);



    while(1)

    {

        /* check if any packet received */

        if (ETH_CheckReceivedFrame())

        {

            /* process received ethernet packet */

            LwIP_Pkt_Handle();

        }

        /* handle periodic timers for LwIP */

        LwIP_Periodic_Handle(ETHTimer);

    }

}