diff -r ebc84c812384 -r 46218c8b8afa Symbian3/PDK/Source/GUID-A849B353-76E5-5AD6-851A-AF18C66AED48.dita --- a/Symbian3/PDK/Source/GUID-A849B353-76E5-5AD6-851A-AF18C66AED48.dita Thu Mar 11 15:24:26 2010 +0000 +++ b/Symbian3/PDK/Source/GUID-A849B353-76E5-5AD6-851A-AF18C66AED48.dita Thu Mar 11 18:02:22 2010 +0000 @@ -1,71 +1,71 @@ - - - - - -Generic -Driver Support OverviewGeneric driver related concepts in Symbian platform. -
Architecture

The -role of a generic device driver is to give a user-side application access -to peripheral resources without exposing the operation of the underlying hardware. -A device driver is effectively an add-on to the kernel, and implements a polymorphic -interface defined by the kernel. It resides on the kernel side and therefore -has the same access rights, uses the kernel heap and links to the kernel, -so that it can call kernel functions. Typically, hardware indicates completion -of an operation by generating an interrupt. This is handled by an Interrupt -Service Routine (ISR) provided by the driver. An ISR is restricted in what -it can do, and must complete quickly. So it is normal for it to schedule a -Delayed Function Call (DFC) which at some later time runs in the context of -a kernel-side thread. Device driver services are generally asynchronous. A -device driver includes:

    -

  • A user-side API

    • -

  • Two kernel-side DLLs, -each of which exports a single factory function at ordinal 1 to create the -necessary kernel-side objects, namely

      -

    • Logical device driver -DLL with a file name extension .ldd

      • -

    • Physical device driver -DLL with a file name extension .pdd

      • -
    • -
-
Components

The -following components make up the generic driver support collection:

    -

  • Generic Board Support -Packages

    • -

  • Media Drivers

    • -

  • SD Card 3C Driver

    • -

  • SD Card 4C Driver

    • -

  • System On Chip ASSP

    • -
-
Using Generic -Driver Support
    -

  • Generic Board Support -Packages - Generic Board Support Packages provides generic code for DMA framework, -power management and digitizer.

    • -

  • Media Drivers - The -Media Drivers collection provides the physical device drivers, called media -drivers, and associated libraries that manage storage media hardware. Some -media drivers have platform specific layers that a base port can implement -for particular types of storage hardware.

    • -

  • SD Card 3C Driver - -SD Card 3C Driver provides media drivers and generic (PIL) parts of the stack -for accessing Secure Digital flash memory cards.

    • -

  • SD Card 4C Driver - -SD Card 4C Driver provides media drivers and generic (PIL) parts of the stack -for accessing 4C type Secure Digital flash memory cards.

    • -

  • System On Chip ASSP -- System On Chip ASSP contains source for common hardware peripherals that -may be used by multiple BSPs.

    • -
4C and 3C type SD card drivers are split, as they are available -under different licenses.
- - -Logical Device Drivers and Generic Driver Support - + + + + + +Generic +Driver Support OverviewGeneric driver related concepts in Symbian platform. +
Architecture

The +role of a generic device driver is to give a user-side application access +to peripheral resources without exposing the operation of the underlying hardware. +A device driver is effectively an add-on to the kernel, and implements a polymorphic +interface defined by the kernel. It resides on the kernel side and therefore +has the same access rights, uses the kernel heap and links to the kernel, +so that it can call kernel functions. Typically, hardware indicates completion +of an operation by generating an interrupt. This is handled by an Interrupt +Service Routine (ISR) provided by the driver. An ISR is restricted in what +it can do, and must complete quickly. So it is normal for it to schedule a +Delayed Function Call (DFC) which at some later time runs in the context of +a kernel-side thread. Device driver services are generally asynchronous. A +device driver includes:

    +

  • A user-side API

    • +

  • Two kernel-side DLLs, +each of which exports a single factory function at ordinal 1 to create the +necessary kernel-side objects, namely

      +

    • Logical device driver +DLL with a file name extension .ldd

      • +

    • Physical device driver +DLL with a file name extension .pdd

      • +
    • +
+
Components

The +following components make up the generic driver support collection:

    +

  • Generic Board Support +Packages

    • +

  • Media Drivers

    • +

  • SD Card 3C Driver

    • +

  • SD Card 4C Driver

    • +

  • System On Chip ASSP

    • +
+
Using Generic +Driver Support
    +

  • Generic Board Support +Packages - Generic Board Support Packages provides generic code for DMA framework, +power management and digitizer.

    • +

  • Media Drivers - The +Media Drivers collection provides the physical device drivers, called media +drivers, and associated libraries that manage storage media hardware. Some +media drivers have platform specific layers that a base port can implement +for particular types of storage hardware.

    • +

  • SD Card 3C Driver - +SD Card 3C Driver provides media drivers and generic (PIL) parts of the stack +for accessing Secure Digital flash memory cards.

    • +

  • SD Card 4C Driver - +SD Card 4C Driver provides media drivers and generic (PIL) parts of the stack +for accessing 4C type Secure Digital flash memory cards.

    • +

  • System On Chip ASSP +- System On Chip ASSP contains source for common hardware peripherals that +may be used by multiple BSPs.

    • +
4C and 3C type SD card drivers are split, as they are available +under different licenses.
+ + +Logical Device Drivers and Generic Driver Support + \ No newline at end of file