{"id":1475,"date":"2016-02-12T23:42:34","date_gmt":"2016-02-13T07:42:34","guid":{"rendered":"http:\/\/visualgdb.com\/w\/?p=1475"},"modified":"2016-02-13T00:04:56","modified_gmt":"2016-02-13T08:04:56","slug":"creating-a-basic-http-server-with-stm32f7-discovery","status":"publish","type":"post","link":"https:\/\/visualgdb.com\/tutorials\/arm\/stm32\/lwip\/","title":{"rendered":"Creating a basic HTTP server with STM32F7-Discovery"},"content":{"rendered":"

This tutorial shows how to create a very basic HTTP server project with the STM32F7-Discovery board using the lwIP library and VisualGDB. Before you begin, install Visual Studio and VisualGDB 5.1 or later.<\/p>\n

    \n
  1. Start Visual Studio and open the VisualGDB Embedded Project Wizard:\"01-newprj\"<\/a><\/li>\n
  2. Proceed with the default “new embedded binary” setting:\"02-binary\"<\/a><\/li>\n
  3. On the next page of the wizard select the ARM toolchain and choose the STM32F746NG device used on the STM32F7-Discovery board. If you are using a different board, you would need to copy the hardware setup functions from the examples for that board (more details in the end of this tutorial).\"03-device\"<\/a><\/li>\n
  4. On the Sample Selection page choose the “HTTP Server” example and press “Next”:\"04-http\"<\/a><\/li>\n
  5. Finally select a debug method that works with your board. For most STM32 boards you can simply select OpenOCD and plug the board in to get the settings auto-detected:\"05-debug\"<\/a><\/li>\n
  6. Press “Finish” to generate your project. Build it with Ctrl-Shift-B:\"06-build\"<\/a><\/li>\n
  7. Ensure the on-board ST-Link is connected to your computer and that the Ethernet port is connected to a network with a valid DHCP server:\"board\"<\/a><\/li>\n
  8. Start debugging by pressing F5. Observe how the board reports the IP address it gets via the semihosting window:\"07-got-ip\"<\/a><\/li>\n
  9. Open your browser and go to the address of the board:\"08-browser\"<\/a><\/li>\n
  10. Set a breakpoint after the call to the netconn_recv() and refresh the page in your browser. Hover the mouse over the inbuf<\/strong> variable to find out the address of the payload buffer:\"08a-rqaddr\"<\/a><\/li>\n
  11. Copy the payload buffer address to the Memory window to see the contents of the request received from the browser:\"09-request\"<\/a><\/li>\n
  12. Now we will quickly go through the components used by the server example. The project relies on the STM32 HAL library, FreeRTOS library for multi-threading support and the lwIP library for the network functionality. You can add and remove references to these frameworks via VisualGDB Project Properties: \"10-frameworks\"<\/a>You can configure various settings of those frameworks by editing\u00a0stm32f7xx_hal_conf.h, FreeRTOSConfig.h and\u00a0lwipopts.h.<\/li>\n
  13. The central point of the application is the MainThread() function. It calls the netconn API functions such as netconn_accept() that are similar to the normal socket functions. You can use the Code Map provided by the Clang IntelliSense to quickly visualize the relations between the functions:\"codemap\"<\/a><\/li>\n
  14. If you want to target a different board, you need to replace the SystemClock_Config() function in the main file and the entire ethernetif.c file with the ones from an Ethernet example for your board. Note that ethernetif.c files from non-RTOS examples are not compatible with the RTOS-based examples.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    This tutorial shows how to create a very basic HTTP server project with the STM32F7-Discovery board using the lwIP library<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[116,117,61],"_links":{"self":[{"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/posts\/1475"}],"collection":[{"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/comments?post=1475"}],"version-history":[{"count":6,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/posts\/1475\/revisions"}],"predecessor-version":[{"id":1494,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/posts\/1475\/revisions\/1494"}],"wp:attachment":[{"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/media?parent=1475"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/categories?post=1475"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/tags?post=1475"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}