From c8942ef4699362747efd6580975a7f61757a4cd6 Mon Sep 17 00:00:00 2001 From: Dean Camera Date: Fri, 1 Oct 2010 12:01:54 +0000 Subject: Fixed LowLevel JoystickHostWithParser demo not saving the chosen HID interface's report descriptor size. Simplified low level Host demo configuration descriptor parser routines. --- .../LowLevel/GenericHIDHost/ConfigDescriptor.c | 27 ++++++++++------------ 1 file changed, 12 insertions(+), 15 deletions(-) (limited to 'Demos/Host/LowLevel/GenericHIDHost') diff --git a/Demos/Host/LowLevel/GenericHIDHost/ConfigDescriptor.c b/Demos/Host/LowLevel/GenericHIDHost/ConfigDescriptor.c index 2de7b722b..093c7db65 100644 --- a/Demos/Host/LowLevel/GenericHIDHost/ConfigDescriptor.c +++ b/Demos/Host/LowLevel/GenericHIDHost/ConfigDescriptor.c @@ -51,8 +51,9 @@ uint8_t ProcessConfigurationDescriptor(void) void* CurrConfigLocation = ConfigDescriptorData; uint16_t CurrConfigBytesRem; - USB_Descriptor_Endpoint_t* DataINEndpoint = NULL; - USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL; + USB_Descriptor_Interface_t* HIDInterface = NULL; + USB_Descriptor_Endpoint_t* DataINEndpoint = NULL; + USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL; /* Retrieve the entire configuration descriptor into the allocated buffer */ switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData))) @@ -66,19 +67,12 @@ uint8_t ProcessConfigurationDescriptor(void) default: return ControlError; } - - /* Get the first HID interface from the configuration descriptor */ - if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, - DComp_NextHIDInterface) != DESCRIPTOR_SEARCH_COMP_Found) - { - /* Descriptor not found, error out */ - return NoCompatibleInterfaceFound; - } while (!(DataINEndpoint) || !(DataOUTEndpoint)) { - /* Get the next HID interface's data endpoint descriptor */ - if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + /* See if we've found a likely compatible interface, and if there is an endpoint within that interface */ + if (!(HIDInterface) || + USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, DComp_NextHIDInterfaceDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found) { /* Not all HID devices have an OUT endpoint - if we've reached the end of the HID descriptor @@ -86,9 +80,6 @@ uint8_t ProcessConfigurationDescriptor(void) if (DataINEndpoint) break; - /* Clear any found endpoints */ - DataOUTEndpoint = NULL; - /* Get the next HID interface from the configuration descriptor */ if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, DComp_NextHIDInterface) != DESCRIPTOR_SEARCH_COMP_Found) @@ -97,6 +88,12 @@ uint8_t ProcessConfigurationDescriptor(void) return NoCompatibleInterfaceFound; } + /* Save the interface in case we need to refer back to it later */ + HIDInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t); + + /* Clear any found endpoints */ + DataOUTEndpoint = NULL; + /* Skip the remainder of the loop as we have not found an endpoint yet */ continue; } -- cgit v1.2.3