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68 lines
2.9 KiB
Markdown
68 lines
2.9 KiB
Markdown
# Baremetal webserver on NUCLEO-F746ZG
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This firmware uses MIP, an experimental TCP/IP stack of the Mongoose Network Library,
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which implements the following:
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- A complete [HTTP device dashboard](../../device-dashboard) with:
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- User authentication
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- Real-time device data graph
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- Coninfiguration display and update
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- MQTT communication with a remote MQTT server
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- Implements SNTP time synchronisation
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- No dependencies: no HAL, no CMSIS, no RTOS
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- Hand-written [mcu.h](mcu.h) header based on the [datasheet](https://www.st.com/resource/en/reference_manual/rm0385-stm32f75xxx-and-stm32f74xxx-advanced-armbased-32bit-mcus-stmicroelectronics.pdf)
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- Interrupt-driven [Ethernet driver](../../../mip/driver_stm32.c)
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- Blue LED blinky, based on SysTick interrupt
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- User button handler, turns off/on green LED, based on EXTI, interrupt-driven
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- HardFault handler that blinks red LED
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- Debug log on UART3 (st-link)
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## Requirements
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- [GNU make](http://mongoose.ws/tutorials/tools/#gnu-make)
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- [ARM GCC](http://mongoose.ws/tutorials/tools/#arm-gcc)
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- [stlink](http://mongoose.ws/tutorials/tools/#stlink) for flashing
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The links above will send you to tutorials on how to install each of those tools in your workstation for Linux, Mac, and Windows.
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## Usage
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Plugin your Nucleo board into USB, and attach an Ethernet cable.
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To build and flash:
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```sh
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$ make clean flash
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```
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To see debug log, use any serial monitor program like `picocom` at 115200 bps and configure it to insert carriage returns after line feeds:
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```sh
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$ picocom /dev/ttyACM0 -i -b 115200 --imap=lfcrlf
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```
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There is also a [detailed tutorial on this example](https://mongoose.ws/tutorials/stm32/nucleo-f746zg-baremetal/)
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## Benchmark
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A quick comparison is made with several other implementations.
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Note: `IP` in the table below is the IP address printed on the console after
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boot. The benchmark command is the same: `siege -c 5 -t 5s http://IP`
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| | Zephyr | LWIP sockets | LWIP raw | MIP |
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| ------------------- | -------- | ------------ | -------- | ---- |
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| Requests per second | 3 | 16 | 286 | 1080 |
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| Firmware size | 117k (*) | 160k | 114k | 28k |
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- Zephyr: uses Zehypr's RTOS and TCP stack, with Mongoose library on top,
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[source code](https://github.com/cesanta/mongoose/tree/master/examples/zephyr/http-server).
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(*) By default, Zephyr example is TLS-enabled. To compare sizes, a TLS-disabled
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build was done by disabling TLS in `prj.conf` and `CMakeLists.txt`
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- LWIP sockets: uses FreeRTOS and LWIP with sockets support, with Mongoose
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library on top, [source code](https://github.com/mongoose-examples/stm32-nucleo-f746z).
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built with `#define MG` in `Core/main.c`
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- LWIP raw: uses FreeRTOS and LWIP without sockets, LWIP's httpd server,
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[source code](https://github.com/mongoose-examples/stm32-nucleo-f746z).
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built with `#define MG` line commented out in `Core/main.c`
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- MIP: this repository
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