USB OTG Phy

[Maaz1]

Hi all

For some reason unknown to me, my PHYSEL bit in GUSBCFG is not setting, and I don't know why

static inline void core_initialisation(void) //from page 3403
{
 // 1. Program OTG_GAHBCFG register:
 // - Enable global interrupt mask bit (GINTMSK)
 // - Enable Rx FIFO non-empty interrupt (RXFLVL)
 // - Set periodic Tx FIFO empty level (PTXFELVL)

 // Enable global interrupt (GINT)
 SET_BIT(USB_OTG_HS->GAHBCFG, USB_OTG_GAHBCFG_GINT);


 // Enable Rx FIFO non-empty interrupt mask
 SET_BIT(USB_OTG_HS->GAHBCFG, USB_OTG_GAHBCFG_PTXFELVL); // periodic Tx FIFO empty level

 // Note: RXFLVL interrupt is unmasked in GINTMSK, not GAHBCFG.

 // 2. Program OTG_GUSBCFG register:
 // - Set full-speed device mode (FDMOD)
 // - Select embedded PHY (PHYSEL)
 // - Set turnaround time (TRDT)
 MODIFY_REG(USB_OTG_HS->GUSBCFG,
 USB_OTG_GUSBCFG_FDMOD | USB_OTG_GUSBCFG_PHYSEL | USB_OTG_GUSBCFG_TRDT,
 USB_OTG_GUSBCFG_FDMOD | USB_OTG_GUSBCFG_PHYSEL | _VAL2FLD(USB_OTG_GUSBCFG_TRDT, 0x09)
 );

 // 3. Unmask interrupts in OTG_GINTMSK register:
 SET_BIT(USB_OTG_HS->GINTMSK,
 USB_OTG_GINTMSK_USBRST | // USB reset interrupt mask
 USB_OTG_GINTMSK_ENUMDNEM | // Enumeration done interrupt mask
 USB_OTG_GINTMSK_SOFM | // Start of frame mask
 USB_OTG_GINTMSK_USBSUSPM | // USB suspend mask
 USB_OTG_GINTMSK_WUIM | // Wakeup interrupt mask
 USB_OTG_GINTMSK_IEPINT | // IN endpoint interrupt mask
 USB_OTG_GINTMSK_OEPINT | // OUT endpoint interrupt mask
 USB_OTG_GINTMSK_RXFLVLM // Rx FIFO non-empty mask
 );

 // Optional: read CMOD bit from GINTSTS to check mode (device or host)
 // uint32_t mode = READ_BIT(USB_OTG_HS->GINTSTS, USB_OTG_GINTSTS_CMOD);
 // if(mode == USB_OTG_GINTSTS_CMOD) { /* Host mode */ } else { /* Device mode */ }
}



static void initialise_device_core() //FROM PAGE 3405
{
	core_initialisation();
	HAL_Delay(50);
	// Enables the clock for USB core.
	SET_BIT(RCC->AHB2ENR1, 1<<14|1<<15);
	SET_BIT(USB_OTG_HS->GCCFG, USB_OTG_GCCFG_PDEN|USB_OTG_GCCFG_PULLDOWNEN|USB_OTG_GCCFG_VBVALEXTOEN|USB_OTG_GCCFG_VBVALOVAL|USB_OTG_GCCFG_SDEN|USB_OTG_GCCFG_DCDEN|1<<16|1<<18);



	// Configures the device to run in full speed mode.
	MODIFY_REG(USB_OTG_HS_DEVICE->DCFG,
		USB_OTG_DCFG_DSPD,
		_VAL2FLD(USB_OTG_DCFG_DSPD, 0x03)
	);

	// Enables VBUS sensing device.
	SET_BIT(USB_OTG_HS->GCCFG, USB_OTG_GCCFG_VBDEN);

	// Unmasks the main USB core interrupts.


	CLEAR_BIT(USB_OTG_HS_DEVICE->DCTL, USB_OTG_DCTL_SDIS );

	// Clears all pending core interrupts.
	WRITE_REG(USB_OTG_HS->GINTSTS, 0xFFFFFFFF);


	// Unmasks transfer completed interrupts for all endpoints.
	SET_BIT(USB_OTG_HS_DEVICE->DOEPMSK, USB_OTG_DOEPMSK_XFRCM);
	SET_BIT(USB_OTG_HS_DEVICE->DIEPMSK, USB_OTG_DIEPMSK_XFRCM);

	if (USB_OTG_HS_GLOBAL->GINTSTS & USB_OTG_GINTSTS_USBRST)
	{
		log_info("Setup bs is done.");
	}



}

 

I have set my phy sel to happen early on, but its still not working.

 

Any thoughts would be appreciated

[AScha.3]

Hi,

Did you use Cube or IDE to setup the USB host or what you doing at all ?

If not, just do it and then look, how it's done in the generated code.

Btw, otg, host and devices is not working by the code generator, so decide making a host or a device.

[Maaz1]

I used the ide to setup as device mode. And then I implemented the code i posted. So all the timing and USB PHY stuff should be sorted but it isnt.

[AScha.3]

Aha, ok, but you can't init device and then otg...  Afaik the USB cannot init both same time, you have to wait for something to connect and check: is it giving 5v power, so init device and start it, but if sense ( pulled up) is going low, a device is connected and so you switch on power to the USB port and init host mode and start it, enumeration etc.

And afaik there is no working example by STM for otg, host and device .

I also did host and device always on separate USB port, if CPU has 2 USB or having device mode for booting, bootloader, but for normal program use only host mode, to connect an USB stick for file exchange ect.

This (my) only working device and host on same USB port.