Question
reading form USB flash drive
Posted on July 20, 2013 at 11:30
Hello all,
I
am a bit new to
ARM processors.
I want to read images from USB Flash drive
attached to STM32F4 Discovery.I used the USB
host library +FA
TFS.While debugging
I figured out that the device is not getting enumerated.i.e
,in the usbh_core.c from
HOST_DEV attached it goes to HOST_CTRL_XFER.
this is my main.c program:
int main(void) { init_GPIO(); USBH_Init(&USB_OTG_Core, USB_OTG_FS_CORE_ID, &USB_Host, &USBH_MSC_cb, &USR_Callbacks);for(;;)
{
USBH_Process(&USB_OTG_Core, &USB_Host); }}The USBH state remains is shown b
elow:
{gState = HOST_CTRL_XFER, gStateBkp = HOST_ENUMERATION, EnumState = ENUM_IDLE, RequestState = CMD_WAIT, Control = {hc_num_in = 1 '\001', hc_num_out = 0 '\000', ep0size = 64 '@', buff = 0x20000634 '''', length = 8, errorcount = 0 '\000', timer = 0, status = CTRL_START, setup = { d8 = ''\200\006\000\001\000\000\b'', b = {bmRequestType = 128 '\200', bRequest = 6 '\006', wValue = {w = 256, bw = {msb = 0 '\000', lsb = 1 '\001'}}, wIndex = {w = 0, bw = {msb = 0 '\000', lsb = 0 '\000'}}, wLength = {w = 8, bw = {msb = 8 '\b', lsb = 0 '\000'}}}}, state = CTRL_SETUP_WAIT}, device_prop = {address = 0 '\000', speed = 1 '\001', Dev_Desc = {bLength = 0 '\000', bDescriptorType = 0 '\000', bcdUSB = 0, bDeviceClass = 0 '\000', bDeviceSubClass = 0 '\000', bDeviceProtocol = 0 '\000', bMaxPacketSize = 0 '\000', idVendor = 0, idProduct = 0, bcdDevice = 0, iManufacturer = 0 '\000', iProduct = 0 '\000', iSerialNumber = 0 '\000', bNumConfigurations = 0 '\000'}, Cfg_Desc = {bLength = 0 '\000', bDescriptorType = 0 '\000', wTotalLength = 0, bNumInterfaces = 0 '\000', bConfigurationValue = 0 '\000', iConfiguration = 0 '\000', bmAttributes = 0 '\000', bMaxPower = 0 '\000'}, Itf_Desc = {{bLength = 0 '\000', bDescriptorType = 0 '\000', bInterfaceNumber = 0 '\000', bAlternateSetting = 0 '\000', bNumEndpoints = 0 '\000', bInterfaceClass = 0 '\000', bInterfaceSubClass = 0 '\000', bInterfaceProtocol = 0 '\000', iInterface = 0 '\000'}, {bLength = 0 '\000', bDescriptorType = 0 '\000', bInterfaceNumber = 0 '\000', bAlternateSetting = 0 '\000', bNumEndpoints = 0 '\000', bInterfaceClass = 0 '\000', bInterfaceSubClass = 0 '\000', bInterfaceProtocol = 0 '\000', iInterface = 0 '\000'}}, Ep_Desc = {{{bLength = 0 '\000', bDescriptorType = 0 '\000', bEndpointAddress = 0 '\000', bmAttributes = 0 '\000', wMaxPacketSize = 0, bInterval = 0 '\000'}, {bLength = 0 '\000', bDescriptorType = 0 '\000', bEndpointAddress = 0 '\000', bmAttributes = 0 '\000', wMaxPacketSize = 0, bInterval = 0 '\000'}}, {{bLength = 0 '\000', bDescriptorType = 0 '\000', bEndpointAddress = 0 '\000', bmAttributes = 0 '\000', wMaxPacketSize = 0, bInterval = 0 '\000'}, { bLength = 0 '\000', bDescriptorType = 0 '\000', bEndpointAddress = 0 '\000', bmAttributes = 0 '\000', wMaxPacketSize = 0, bInterval = 0 '\000'}}}, HID_Desc = {bLength = 0 '\000', bDescriptorType = 0 '\000', bcdHID = 0, bCountryCode = 0 '\000', bNumDescriptors = 0 '\000', bReportDescriptorType = 0 '\000', wItemLength = 0}}, class_cb = 0x20000084, usr_cb = 0x2000003c} Theusb
h always re
mains at this.
Any leads on how to proceed form here shall be helpful.
#usb