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Changed the parameters and behaviour of the USB_GetDeviceConfigDescriptor() function so that it now performs size checks and data validations internally, to simplify user code.

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This commit is contained in:
Dean Camera 2009-08-31 07:48:32 +00:00
parent 813e6f0318
commit 7fbb759287
19 changed files with 232 additions and 254 deletions
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36
Demos/Host/LowLevel/KeyboardHost/ConfigDescriptor.c
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@ -47,29 +47,25 @@
*/
uint8_t ProcessConfigurationDescriptor(void)
{
uint8_t* ConfigDescriptorData;
uint16_t ConfigDescriptorSize;
/* 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);
uint8_t ConfigDescriptorData[512];
uint8_t* CurrConfigLocation = ConfigDescriptorData;
uint16_t CurrConfigBytesRem;
/* 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 keyboard interface from the configuration descriptor */
if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
DComp_NextKeyboardInterface) != DESCRIPTOR_SEARCH_COMP_Found)
{
/* Descriptor not found, error out */
@ -77,7 +73,7 @@ uint8_t ProcessConfigurationDescriptor(void)
}
/* Get the keyboard interface's data endpoint descriptor */
if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
DComp_NextInterfaceKeyboardDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
{
/* Descriptor not found, error out */