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Holger Hans Peter Freyther holger at freyther.deOn 10/04/2011 11:44 AM, Holger Hans Peter Freyther wrote: > SRCMP: 1 == Software reset in progress > RSTTYP: 2 == Watchdog reset > > so it is stuck somewhere. time to get a USBJtag adapter.. :) > Hi, I am lacking USB and AT7SAM knowledge here. I made the debug output synchronous and managed to get here: udp_irq(imr=0x1200, isr=0x0300, state=5): RXSUSP RXRSM END udp_irq(imr=0x1200, isr=0x1000, state=5): ENDBUSRES END udp_irq(imr=0x1203, isr=0x0801, state=5): EP0INT(Control) CSR=0x88804 len=8 bmRequestType=0x80 DATA_IN=1 dfu_state = 0 GET_DESCRIPTOR(wValue=0x0100, wIndex=0x0000) OUT So this means that we at least get a USB request to get our descriptor, and asking for USB_DT_DEVICE. The call is made to: udp_ep0_send_data((const char *) &dev_descriptor, MIN(sizeof(dev_descriptor), wLength)); and it is getting stuck in: udp_ep0_send_zlp(void) { AT91PS_UDP pUdp = AT91C_BASE_UDP; pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY; while (!(pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP)) ; ^^^^ sending never completes Anyone has a guess? I am going to start to read the Atmel docs now.