Posted on August 17, 2014 at 23:13I'm working on usb device project and I need after receiving a command from the host to return the device to predetermined state. To do this, all prepared OUT transfers must be canceled. I set endpoint disable bit(EPDIS) in the endpoint control register. USB core must generate endpoint disable interrupt, but this never happens. The interrupt is not masked. I checked with a debugger inside the interrupt service routine, that bit EPDIS remain set.
What I'm doing wrong?
This is the code of endpoint disable function:
void USB_OTG_DisableEP (USB_OTG_CORE_HANDLE *pdev , USB_OTG_EP *ep)
{
USB_OTG_DEPCTL_TypeDef depctl;
__IO uint32_t *depctl_addr;
/* Process for IN endpoint */
if (ep->is_in == 1)
{
depctl_addr = &(pdev->regs.INEP_REGS[ep->num]->DIEPCTL);
depctl.d32 = USB_OTG_READ_REG32(depctl_addr);
}
else /* Process for OUT endpoint */
{
depctl_addr = &(pdev->regs.OUTEP_REGS[ep->num]->DOEPCTL);
depctl.d32 = USB_OTG_READ_REG32(depctl_addr);
}
if(depctl.b.epena)
{
depctl.b.epena = 0;
depctl.b.epdis = 1;
depctl.b.snak = 1;
}
USB_OTG_WRITE_REG32(depctl_addr, depctl.d32);
}
