Hello,
I've never done a USB Host interface before, now I am trying to enumerate USB Host using NXP's USBHostLite example using LPC1768 controller.
It stuck at "while (!HOST_RhscIntr);"
I got a short serial output followed by flashing
---------------------------- Initializing Host Stack Host Initialized Connect a Mass Storage device -----------------------------
Can anybody tell me why
"LPC_USB->OTGStCtrl = 0x3;" statement is using. And if I use "LPC_USB->OTGStCtrl = 0x203;" this statement then serial output is followed as
------------------------------------ Initializing Host Stack Host Initialized Connect a Mass Storage device ERROR: In Host_EnumDev at Line 358 - rc = -1 ---------------------------------------------
The line (Line 358 in usbhost_lpc17xx.c) is this block of code:
rc = HOST_GET_DESCRIPTOR(USB_DESCRIPTOR_TYPE_DEVICE, 0, TDBuffer, 8); if (rc != OK) { PRINT_Err(rc); return (rc); }
Could it be an issue with my USB drive or hardware?
Many thanks in advance,
-Prakash 9886545216
I have ensured that PORT_FUNC in OTGStCtrl register is 0x3, PWRD, PPWR, POVRCR, USB-D+ and USB-D- are set correctly for USB host in PINSELx.
Observations are as follow,
1. It stuck at "while (!HOST_RhscIntr) ;" and If I not initialize UART, then get rc = -1 at ------------ --------- --------- --------- rc = HOST_GET_DESCRIPTOR (USB_DESCRIPTOR_ TYPE_DEVICE, 0, TDBuffer, 8); if (rc != OK) { PRINT_Err(rc) ; return (rc); } ------------ --------- --------- ---------
because HOST_TDControlStatus = 5.
2. Before setting of global power bit in OHCI RHStatus, HcRhStatus = OR_RH_STATUS_ LPSC; /* Set Global Power */ voltage at PWRD pin is 4.68v and after setting of global power PWRD = 0.8V is it correct?