stm32cube, usb host, hid mouse/keyboard - usb

Question

I've been trying to set up some basic usb comunication with a usb mouse using my stm32f4 discvery. there are no usb examples for my board so I went in to look at other boards.
stm's Cube library thingy promissed easy development and all, so I generated a project with cube inlcuding USB_OTG_FS in host only mode and four IO pins for LED's.
I had a look in the files and it seemed like reading mouse buttons would be fairly trivial, but I can't make it work.
if I run
devtype = USBH_HID_GetDeviceType(&hUsbHostFS);
it detects the device correctly.
USBH_HID_MouseInit(&hUsbHostFS)
returns USBH_OK,
but no matter what I try
mouse=USBH_HID_GetMouseInfo(&hUsbHostFS);
is always NULL
"USBH_HID_MouseInit" is never mentioned in the documentation(DM00105256.pdf)
also, only the RTOS examples use them. Reading the usb host standalone example, it would seem that to comunicate with a mouse would be as simple as runing GetDeviceType, and poll GetMouseInfo, but I can't get it to work.
this is all the code I added, it's executed in the main while
if(Appli_state == APPLICATION_READY){
switch(state)
{
case 0:
devtype = USBH_HID_GetDeviceType(&hUsbHostFS);
if(devtype == HID_MOUSE){
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,1);
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,0);
state=1;
}
else if(devtype == HID_KEYBOARD){
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,0);
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,1);
state=2;
}
else{
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_14,0);
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_12,0);
}
break;
case 1:
if(USBH_HID_MouseInit(&hUsbHostFS)==0){
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_15,1);
state=3;
}
else {
HAL_GPIO_WritePin(GPIOD,GPIO_PIN_15,0);
state=0;
}
break;
case 3:
mouse=USBH_HID_GetMouseInfo(&hUsbHostFS);
if(mouse != NULL)HAL_GPIO_WritePin(GPIOD,GPIO_PIN_13,1);
else HAL_GPIO_WritePin(GPIOD,GPIO_PIN_13,0);
break;
default:
break;
}
}
if(Appli_state != APPLICATION_READY) state=0;
rest of the code is unchanged. like I said before it detects the connection and if it's a mouse, keyboard or unknown device just fine. I just can't get it to communicate

Answer 1

The Cube is buggy, coded in a strange way, and not well documented.
Depending on the actual board you have, you must make sure the clocks are setup correctly (in system_stm32f4.c)
With the stm32f407-based version (http://www.st.com/en/evaluation-tools/stm32f4discovery.html) you should use these settings:
HSE = 8000000
PLL_M = 8
PLL_Q = 7
PLL_N = 336
PLL_P = 4
The USB OTG FS requires a 48MHz clock. Here are the equations:
USB OTG FS, SDIO and RNG Clock = PLL_VCO / PLLQ
PLL_VCO = (HSE_VALUE / PLL_M) * PLL_N