Hi Derek,
This issue can be fixed with the following code in bold added in usb_host_devices.c file.
static usb_status_t USB_HostProcessCallback(usb_host_device_instance_t *deviceInstance)
{
usb_host_pipe_t *pipe = (usb_host_pipe_t *)deviceInstance->controlPipe;
usb_status_t status = kStatus_USB_Success;
usb_descriptor_configuration_t *configureDesc;
volatile uint32_t i = 0xffffU;
usb_host_instance_t *hostInstance = (usb_host_instance_t *)deviceInstance->hostHandle;
switch (deviceInstance->state)
{
case kStatus_DEV_GetDes8: /* process get 8 bytes descriptor result */
pipe->maxPacketSize = deviceInstance->deviceDescriptor.bMaxPacketSize0;
hostInstance->controllerTable->controllerIoctl(
hostInstance->controllerHandle, kUSB_HostUpdateControlPacketSize, deviceInstance->controlPipe);
break;
case kStatus_DEV_SetAddress: /* process set address result */
while(i--)
{
;
}
deviceInstance->setAddress = deviceInstance->allocatedAddress;
hostInstance->controllerTable->controllerIoctl(
hostInstance->controllerHandle, kUSB_HostUpdateControlEndpointAddress, deviceInstance->controlPipe);
break;
The enumeration failure is caused by USB host sending set address request too fast to USB device. It needs to wait for some time.
Hao
