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