diff options
Diffstat (limited to 'Demos/Host/LowLevel/PrinterHost/ConfigDescriptor.c')
| -rw-r--r-- | Demos/Host/LowLevel/PrinterHost/ConfigDescriptor.c | 39 |
1 files changed, 16 insertions, 23 deletions
diff --git a/Demos/Host/LowLevel/PrinterHost/ConfigDescriptor.c b/Demos/Host/LowLevel/PrinterHost/ConfigDescriptor.c index d4eaff94a..22d84c5aa 100644 --- a/Demos/Host/LowLevel/PrinterHost/ConfigDescriptor.c +++ b/Demos/Host/LowLevel/PrinterHost/ConfigDescriptor.c @@ -36,32 +36,26 @@ uint8_t PrinterAltSetting; uint8_t ProcessConfigurationDescriptor(void)
{
- uint8_t* ConfigDescriptorData;
- uint16_t ConfigDescriptorSize;
- uint8_t ErrorCode;
+ uint8_t ConfigDescriptorData[512];
+ uint8_t* CurrConfigLocation = ConfigDescriptorData;
+ uint16_t CurrConfigBytesRem;
uint8_t FoundEndpoints = 0;
-
- /* Get Configuration Descriptor size from the device */
- if (USB_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, NULL) != HOST_SENDCONTROL_Successful)
- return ControlError;
-
- /* Ensure that the Configuration Descriptor isn't too large */
- if (ConfigDescriptorSize > MAX_CONFIG_DESCRIPTOR_SIZE)
- return DescriptorTooLarge;
-
- /* Allocate enough memory for the entire config descriptor */
- ConfigDescriptorData = alloca(ConfigDescriptorSize);
/* Retrieve the entire configuration descriptor into the allocated buffer */
- USB_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData);
-
- /* Validate returned data - ensure first entry is a configuration header descriptor */
- if (DESCRIPTOR_TYPE(ConfigDescriptorData) != DTYPE_Configuration)
- return InvalidConfigDataReturned;
+ switch (USB_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))
+ {
+ case HOST_GETCONFIG_Successful:
+ break;
+ case HOST_GETCONFIG_InvalidData:
+ return InvalidConfigDataReturned;
+ case HOST_GETCONFIG_BuffOverflow:
+ return DescriptorTooLarge;
+ default:
+ return ControlError;
+ }
/* Get the printer interface from the configuration descriptor */
- if ((ErrorCode = USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
- DComp_NextBidirectionalPrinterInterface)))
+ if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, DComp_NextBidirectionalPrinterInterface))
{
/* Descriptor not found, error out */
return NoInterfaceFound;
@@ -74,8 +68,7 @@ uint8_t ProcessConfigurationDescriptor(void) while (FoundEndpoints != ((1 << PRINTER_DATA_OUT_PIPE) | (1 << PRINTER_DATA_IN_PIPE)))
{
/* Fetch the next bulk endpoint from the current printer interface */
- if ((ErrorCode = USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
- DComp_NextInterfaceBulkDataEndpoint)))
+ if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, DComp_NextInterfaceBulkDataEndpoint))
{
/* Descriptor not found, error out */
return NoEndpointFound;
|