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/**
******************************************************************************
* @file LwIP/LwIP_HTTP_Server_Raw/Src/httpd_cg_ssi.c
* @author MCD Application Team
* @brief Webserver SSI and CGI handlers
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "lwip/debug.h"
#include "lwip/tcp.h"
#include "lwip/apps/httpd.h"
#include "http_cgi_ssi.h"
#include <string.h>
#include <stdlib.h>
tSSIHandler ADC_Page_SSI_Handler;
uint32_t ADC_not_configured=1;
ADC_HandleTypeDef hadc;
/* 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];
/**
* @brief Configures the ADC.
* @param None
* @retval None
*/
static void ADC_Configuration(void)
{
ADC_ChannelConfTypeDef sConfig;
/* ADC3 Configuration ------------------------------------------------------*/
hadc.Instance = ADC3;
hadc.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
hadc.Init.Resolution = ADC_RESOLUTION_12B;
hadc.Init.ScanConvMode = DISABLE;
hadc.Init.ContinuousConvMode = ENABLE;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.NbrOfConversion = 1;
HAL_ADC_Init(&hadc);
/* ADC3 Regular Channel Config */
sConfig.Channel = ADC_CHANNEL_8;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_56CYCLES;
sConfig.Offset = 0;
HAL_ADC_ConfigChannel(&hadc, &sConfig);
/* Enable EOC interrupt */
HAL_ADC_Start(&hadc);
}
/**
* @brief 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;
}
HAL_ADC_PollForConversion(&hadc, 10);
/* get ADC conversion value */
ADCVal = HAL_ADC_GetValue(&hadc);
/* convert to Voltage, step = 0.8 mV */
ADCVal = (uint32_t)(ADCVal * 0.8);
/* 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;
}
/**
* @brief 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 */
BSP_LED_Off(LED1);
BSP_LED_Off(LED2);
BSP_LED_Off(LED3);
BSP_LED_Off(LED4);
/* 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 LED1 ON if 1 */
if(strcmp(pcValue[i], "1") ==0)
BSP_LED_On(LED1);
/* Switch LED2 ON if 2 */
else if(strcmp(pcValue[i], "2") ==0)
BSP_LED_On(LED2);
/* Switch LED3 ON if 3 */
else if(strcmp(pcValue[i], "3") ==0)
BSP_LED_On(LED3);
/* Switch LED4 ON if 4 */
else if(strcmp(pcValue[i], "4") ==0)
BSP_LED_On(LED4);
}
}
/* uri to send after cgi call*/
return "/STM32F4xxLED.html";
}
/**
* @brief Http webserver Init
*/
void http_server_init(void)
{
/* Httpd Init */
httpd_init();
/* configure SSI handlers (ADC page SSI) */
http_set_ssi_handler(ADC_Handler, (char const **)TAGS, 1);
/* configure CGI handlers (LEDs control CGI) */
CGI_TAB[0] = LEDS_CGI;
http_set_cgi_handlers(CGI_TAB, 1);
}