Blinking LEDs over HTTP on STM32

GPIO control over HTTP on STM32F4-Discovery

You can control LEDs over HTTP server running on Embox. In this example LEDs states and current network settings can be stored/restored from the internal flash filesystem.

1. Configure and build: make confload-project/gpio_http_admin/stm32f4_discovery && make.
2. Flash Embox (more details on how to flash here).
3. Run your board.

You will see how Embox mounts settings and starts httpd:

Started shell [tish] on device [diag]
loading start script:
> ifconfig lo 127.0.0.1 netmask 255.0.0.0 up 
> route add 127.0.0.0 netmask 255.0.0.0 lo 
> ifconfig eth0 192.168.1.128 netmask 255.255.255.0 hw ether AA:BB:CC:DD:EE:02 up 
> route add 192.168.1.0 netmask 255.255.255.0 eth0 
> ls /dev 
 /dev/stm32flash0
 /dev/ttyS1
 /dev/ttyS0
> mount -t DumbFS /dev/stm32flash0 /conf 
> led_driver init 
> flash_settings restore 
Restoring flash settings
flash_settings: flashset_nic_restore: failed
flash_settings: flashset_led_restore: Error opening led
  net       [fail]
  led       [fail]
> ifconfig 
lo      Link encap:Local Loopback
        inet addr:127.0.0.1  Mask:255.0.0.0
        inet6 addr: ::/??  Scope:Host
        UP LOOPBACK RUNNING  MTU:16436  Metric:0
        RX packets:0 errors:0 dropped:0 overruns:0 frame:0
        TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0
        RX bytes:0 (0 MiB)  TX bytes:0 (0 MiB)

eth0    Link encap:Ethernet  HWaddr aa:bb:cc:dd:ee:02
        inet addr:192.168.1.128  Bcast:192.168.1.255  Mask:255.255.255.0
        inet6 addr: ::/??  Scope:Host
        UP BROADCAST MULTICAST  MTU:1514  Metric:0
        RX packets:0 errors:0 dropped:0 overruns:0 frame:0
        TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0
        RX bytes:0 (0 MiB)  TX bytes:0 (0 MiB)
        Interrupt:61 Base address:0x40028000

> service httpd http_admin 
Starting service: httpd
embox>

4. Open your browser and go to the address http://192.168.1.128/

Now you can control LEDs and save their states to internal flash memory, so their states will be restored after reboot.

After you press 'SAVE' current LEDs states will be saved to flash, you can see in Embox shell:

embox>Storing flash settings
flash_settings: main: Storing setting "led"

You can also go to another page and see. modify and store network settings:

If you will modify and save network settings, they will be applied after reboot:

Storing flash settings
flash_settings: main: Storing setting "net"
Net configuration is saved succesffully
        Rebooting now to apply new net config...

LEDs will blink: