Update Mass Storage bootloader so that it can support devices with only 4KB bootloade...

[pub/USBasp.git] / Bootloaders / MassStorage / Descriptors.c

diff --git a/Bootloaders/MassStorage/Descriptors.c b/Bootloaders/MassStorage/Descriptors.c
index 4de1207..cbc320f 100644 (file)
--- a/Bootloaders/MassStorage/Descriptors.c
+++ b/Bootloaders/MassStorage/Descriptors.c
@@ -60,7 +60,7 @@ const USB_Descriptor_Device_t DeviceDescriptor =
 
        .ManufacturerStrIndex   = NO_DESCRIPTOR,
        .ProductStrIndex        = NO_DESCRIPTOR,
-       .SerialNumStrIndex      = USE_INTERNAL_SERIAL,
+       .SerialNumStrIndex      = NO_DESCRIPTOR,
 
        .NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
 };
@@ -124,17 +124,6 @@ const USB_Descriptor_Configuration_t ConfigurationDescriptor =
                }
 };
 
-/** Language descriptor structure. This descriptor, located in FLASH memory, is returned when the host requests
- *  the string descriptor with index 0 (the first index). It is actually an array of 16-bit integers, which indicate
- *  via the language ID table available at USB.org what languages the device supports for its string descriptors.
- */
-const USB_Descriptor_String_t LanguageString =
-{
-       .Header                 = {.Size = USB_STRING_LEN(1), .Type = DTYPE_String},
-
-       .UnicodeString          = {LANGUAGE_ID_ENG}
-};
-
 /** This function is called by the library when in device mode, and must be overridden (see library "USB Descriptors"
  *  documentation) by the application code so that the address and size of a requested descriptor can be given
  *  to the USB library. When the device receives a Get Descriptor request on the control endpoint, this function
@@ -145,30 +134,21 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
                                     const uint8_t wIndex,
                                     const void** const DescriptorAddress)
 {
-       const uint8_t  DescriptorType   = (wValue >> 8);
-       const uint8_t  DescriptorNumber = (wValue & 0xFF);
+       const uint8_t DescriptorType = (wValue >> 8);
 
        const void* Address = NULL;
        uint16_t    Size    = NO_DESCRIPTOR;
 
-       switch (DescriptorType)
+       /* If/Else If chain compiles slightly smaller than a switch case */
+       if (DescriptorType == DTYPE_Device)
+       {
+               Address = &DeviceDescriptor;
+               Size    = sizeof(USB_Descriptor_Device_t);
+       }
+       else if (DescriptorType == DTYPE_Configuration)
        {
-               case DTYPE_Device:
-                       Address = &DeviceDescriptor;
-                       Size    = sizeof(USB_Descriptor_Device_t);
-                       break;
-               case DTYPE_Configuration:
-                       Address = &ConfigurationDescriptor;
-                       Size    = sizeof(USB_Descriptor_Configuration_t);
-                       break;
-               case DTYPE_String:
-                       if (!(DescriptorNumber))
-                       {
-                                       Address = &LanguageString;
-                                       Size    = pgm_read_byte(&LanguageString.Header.Size);
-                       }
-
-                       break;
+               Address = &ConfigurationDescriptor;
+               Size    = sizeof(USB_Descriptor_Configuration_t);
        }
 
        *DescriptorAddress = Address;