stm32f072 joystick

[Afonso Marques]

Posted on March 16, 2018 at 13:11

Hi,

Please forgive as I am new to STM32 devices and tools.

I was suggested to use a STM32 F0 Discovery dev kit (STM32F072RBT6) in order to develop a very simple application: a custom made 3 axles joystick (x,y and throttle).

I have installed STM32CubeMX, SystemWorkbench for STM32 (SW4STM32) and followed all the steps without any problem until the point of creating a Custom HID Class.

1. How do I compile just to check that everything is OK so far? (it should be after all everything was automated)

2. I found a joystick descriptor (please see below) which, I think, fits the purpose. How do I use, configure, insert, edit, etc the current one either on CubeMX or SW4?

3. Is there a demo somewhere that I can look at?

Thanks in advance.

-x-x-x-x-x-

Joystick descriptor:

USAGE_PAGE (Generic Desktop)    05 01

LOGICAL_MINIMUM (0)    15 00 USAGE (Joystick)    09 04COLLECTION (Application)    A1 01   USAGE_PAGE (Simulation Controls)    05 02  USAGE (Throttle)    09 BB  LOGICAL_MINIMUM (-127)    15 81   LOGICAL_MAXIMUM (127)    25 7F   REPORT_SIZE (8)    75 08   REPORT_COUNT (1)    95 01   INPUT (Data,Var,Abs)    81 02   USAGE_PAGE (Generic Desktop)    05 01  USAGE (Pointer)    09 01  COLLECTION (Physical)    A1 00     USAGE (X)    09 30    USAGE (Y)    09 31    REPORT_COUNT (2)    95 02     INPUT (Data,Var,Abs)    81 02   END_COLLECTION    C0  USAGE (Hat switch)    09 39  LOGICAL_MINIMUM (0)    15 00   LOGICAL_MAXIMUM (3)    25 03   PHYSICAL_MINIMUM (0)    35 00   PHYSICAL_MAXIMUM (270)    46 0E 01   UNIT (Eng Rot:Angular Pos)    65 14   REPORT_SIZE (4)    75 04   REPORT_COUNT (1)    95 01   INPUT (Data,Var,Abs)    81 02   USAGE_PAGE (Button)    05 09  USAGE_MINIMUM (Button 1)    19 01  USAGE_MAXIMUM (Button 4)    29 04  LOGICAL_MINIMUM (0)    15 00   LOGICAL_MAXIMUM (1)    25 01   REPORT_SIZE (1)    75 01   REPORT_COUNT (4)    95 04   UNIT_EXPONENT (0)    55 00   UNIT (None)    65 00   INPUT (Data,Var,Abs)    81 02 END_COLLECTION    C0

https://community.st.com/tags♯/?tags=joystick

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https://community.st.com/tags♯/?tags=stm32f072%20discovery

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https://community.st.com/tags♯/?tags=!stm32f072%20!usb%20!custom_hid

‌#stm32f072-discovery #!stm32f072-!usb-!custom_hid #joystick

[Andrew Neil]

Posted on March 16, 2018 at 14:10

I am new to STM32 devices and tools.

Do you have experience with any other microcontroller(s)? With programming in general?

creating a Custom USB Class is not a beginner project!

Getting Started with

STM32 devices and tools:

https://community.st.com/0D50X00009XkWltSAF

[Afonso Marques]

Posted on March 16, 2018 at 14:19

I've programming for the last 15 years at least but this is my first time with USB.

:(

I've been working monstly with ATMega, PIC and SiLabs EFM8, and back in the old days Z8, Z8000 and MC68000.

[Ben K]

Posted on March 18, 2018 at 16:14

creating a Custom USB Class is not a beginner project!

Creating an interface for the ST-provided Custom HID class is entirely different from creating a custom USB device class.

In some of the Cube repository's projects exists the CustomHID_Standalone project (example path: STM32Cube_FW_F7_V1.9.0\Projects\STM32756G_EVAL\Applications\USB_Device\CustomHID_Standalone), which can help getting started. I suggest looking at the class code first to see what definitions are needed in usbd_conf.h, then you can implement the interface loosely based on usbd_customhid_if.c.

I'm not an advocate of the STM32 libraries as they are full of poor design choices, but for this purpose it might serve well. In case you need to create a composite device later on, or just need a better USB device stack, I can recommend

https://github.com/IntergatedCircuits/USBDevice

.