/**
* This function starts the Zero-Length Packet for the IN status phase
* of a 2 stage control transfer.
*/
static void do_setup_in_status_phase( pcd_struct_t *_pcd)
{
dwc_ep_t *ep0 = &g_dwc_eps[0];
if (_pcd->ep0state == EP0_STALL){
return;
}
_pcd->ep0state = EP0_STATUS;
DBG( "EP0 IN ZLP\n");
ep0->xfer_len = 0;
ep0->xfer_count = 0;
ep0->is_in = 1;
dwc_otg_ep_start_transfer( ep0 );
/* Prepare for more SETUP Packets */
ep0_out_start();
}
/**
* This interrupt occurs when a USB Reset is detected. When the USB
* Reset Interrupt occurs the device state is set to DEFAULT and the
* EP0 state is set to IDLE.
* -# Set the NAK bit for all OUT endpoints (DOEPCTLn.SNAK = 1)
* -# Unmask the following interrupt bits
* - DAINTMSK.INEP0 = 1 (Control 0 IN endpoint)
* - DAINTMSK.OUTEP0 = 1 (Control 0 OUT endpoint)
* - DOEPMSK.SETUP = 1
* - DOEPMSK.XferCompl = 1
* - DIEPMSK.XferCompl = 1
* - DIEPMSK.TimeOut = 1
* -# Program the following fields in the endpoint specific registers
* for Control OUT EP 0, in order to receive a setup packet
* - DOEPTSIZ0.Packet Count = 3 (To receive up to 3 back to back
* setup packets)
* - DOEPTSIZE0.Transfer Size = 24 Bytes (To receive up to 3 back
* to back setup packets)
* - In DMA mode, DOEPDMA0 Register with a memory address to
* store any setup packets received
* At this point, all the required initialization, except for enabling
* the control 0 OUT endpoint is done, for receiving SETUP packets.
*/
int32_t dwc_otg_pcd_handle_usb_reset_intr(void)
{
depctl_data_t doepctl = { 0};
daint_data_t daintmsk = { 0};
doepmsk_data_t doepmsk = { 0};
diepmsk_data_t diepmsk = { 0};
dcfg_data_t dcfg = { 0 };
depctl_data_t diepctl = { 0};
depctl_data_t diepctl_rd = { 0};
grstctl_t resetctl = { 0 };
dctl_data_t dctl = { 0 };
int i = 0;
gintsts_data_t gintsts;
DBG("\nUSB RESET\n");
/* Clear the Remote Wakeup Signalling */
dctl.b.rmtwkupsig = 1;
dwc_modify_reg32( DWC_REG_DCTL,dctl.d32, 0 );
/* Disable all active IN EPs */
diepctl.b.epdis = 1;
diepctl.b.snak = 1;
for (i=0; i < NUM_EP; i++) {
diepctl_rd.d32 = dwc_read_reg32(DWC_REG_IN_EP_REG(i));
if (diepctl_rd.b.epena) {
dwc_write_reg32(DWC_REG_IN_EP_REG(i),diepctl.d32 );
}
}
/* Set NAK for all OUT EPs */
doepctl.b.snak = 1;
for (i=0; i < NUM_EP; i++) {
dwc_write_reg32(DWC_REG_OUT_EP_REG(i), doepctl.d32 );
}
/* Flush the NP Tx FIFO */
dwc_otg_flush_tx_fifo( 0 );
/* Flush the Learning Queue */
resetctl.b.intknqflsh = 1;
dwc_write_reg32( DWC_REG_GRSTCTL, resetctl.d32);
daintmsk.b.inep0 = 1;
daintmsk.b.outep0 = 1;
dwc_write_reg32( DWC_REG_DAINTMSK, daintmsk.d32 );
doepmsk.b.setup = 1;
doepmsk.b.xfercompl = 1;
doepmsk.b.ahberr = 1;
doepmsk.b.epdisabled = 1;
dwc_write_reg32( DWC_REG_DOEPMSK, doepmsk.d32 );
diepmsk.b.xfercompl = 1;
diepmsk.b.timeout = 1;
diepmsk.b.epdisabled = 1;
diepmsk.b.ahberr = 1;
dwc_write_reg32( DWC_REG_DIEPMSK, diepmsk.d32 );
/* Reset Device Address */
dcfg.d32 = dwc_read_reg32( DWC_REG_DCFG);
dcfg.b.devaddr = 0;
dwc_write_reg32( DWC_REG_DCFG, dcfg.d32);
/* setup EP0 to receive SETUP packets */
ep0_out_start();
/* Clear interrupt */
gintsts.d32 = 0;
gintsts.b.usbreset = 1;
dwc_write_reg32 ( DWC_REG_GINTSTS, gintsts.d32);
flush_cpu_cache();
return 1;
}
