Posted on June 10, 2018 at 15:54Hello,
i want to use an accelerometer as an joystick over USB. My problem is, that all Tutorials on Youtube are not in english. So i can´t understand the important explanations. Alle tutorials not on Youtube are almost not complete, old or use Arduino stuff with ready to use Hard an Software.
As accelerometer i am using the ST LSM6DS33 with STM32F072 Discovery. As software the CubeMX-SW4STM32(Eclipse) toolchain.
With the (Non Custom) HID USB the accelerometer is working fine....but as an mouse. I need it as joystick. I used that tutorial until step 3.
For building the dicriptor i used that (i want to make small steps, thats why it is an mouse discriptor)
http://eleccelerator.com/tutorial-about-usb-hid-report-descriptors/
And add this under usbd_custom_hid_if.c, showed in that video:
https://www.youtube.com/watch?v=xufZyQf4O7Y
Now it looks like that:
__ALIGN_BEGIN static uint8_t CUSTOM_HID_ReportDesc_FS[USBD_CUSTOM_HID_REPORT_DESC_SIZE] __ALIGN_END =
{
/* USER CODE BEGIN 0 */
0x05, 0x01,// USAGE_PAGE (Generic Desktop)
0x09, 0x02,//USAGE (Mouse)
0xa1, 0x01,// COLLECTION (Application)
0x09, 0x01,// USAGE (Pointer)
0xa1, 0x00,// COLLECTION (Physical)
0x05, 0x09,// USAGE_PAGE (Button)
0x19, 0x01,// USAGE_MINIMUM (Button 1)
0x29, 0x03,// USAGE_MAXIMUM (Button 3)
0x15, 0x00,// LOGICAL_MINIMUM (0)
0x25, 0x01,// LOGICAL_MAXIMUM (1)
0x95, 0x03,// REPORT_COUNT (3)
0x75, 0x01,// REPORT_SIZE (1)
0x81, 0x02,// INPUT (Data,Var,Abs)
0x95, 0x01,// REPORT_COUNT (1)
0x75, 0x05,// REPORT_SIZE (5)
0x81, 0x03,// INPUT (Cnst,Var,Abs)
0x05, 0x01,// USAGE_PAGE (Generic Desktop)
0x09, 0x30,// USAGE (X)
0x09, 0x31,// USAGE (Y)
0x15, 0x81,// LOGICAL_MINIMUM (-127)
0x25, 0x7f,// LOGICAL_MAXIMUM (127)
0x75, 0x08,// REPORT_SIZE (8)
0x95, 0x02,// REPORT_COUNT (2)
0x81, 0x06,// INPUT (Data,Var,Rel)
0xc0,// END_COLLECTION
//0xc0 // END_COLLECTION
/* USER CODE END 0 */
0xC0 /* END_COLLECTION */
};
Eclipse says: 'excess elements in array initializer' for each line. With some Google i found out, that the package size isn´t right. I think it is the CubeMX 'middlewares' -> 'paramter settings' -> 'class parameter'
- USBD_Custom_HID_Report_DESC_SIZE
-USBD_Custom_HID_Outreport_BUF_SIZE
But i haven´t found anything, how i get the that. size. Is it bit, bytes, lines, instructions, bananas? In all tutorials i have found, the size is simple typed in with no explanation or there isn´t said anything about it.
Or is there an other way? Can i use the (non custom) HID? I only need a Standard joystick konfiguration.
