ISR Table and Interrupt IDs

ISR +Table

Decide on the number of interrupts that exist in +the system. If the port is split into a core ASSP layer, and a device +Variant layer, the core layer should include only those interrupts +that exist on the ASSP.

In the core ASSP implementation, declare +a static ISR table, of type SInterruptHandler with +the same number of entries that you have just worked out.

In the template port, for example, this table is static member of +the TemplateInterrupt class:

const TInt KNumTemplateInts=EAsspIntIdZ+1; + +class TemplateInterrupt : public Interrupt + { + ... + public: + static SInterruptHandler Handlers[KNumTemplateInts]; + }; +

SInterruptHandler is +defined in ...\e32\include\kernel\arm\assp.h, +and TemplateInterrrupt is defined in ...\template_assp\template_assp_priv.h.

Interrupt +IDs

Declare an enum in an exported header file that provides +labels for each of the possible Interrupt IDs in the table.

For example, in the template +port, the interrupt IDs are defined by the TTemplateAsspInterruptId enum, defined in ...\template_assp\template_assp.h, and is part of the ASSP layer:

// Enumerate here all ASSP interrupt sources. It could be a good idea to enumerate them in a way that facilitates +// operating on the corresponding interrupt controller registers (for example, using their value as a shift count) +// +// EXAMPLE ONLY +enum TTemplateAsspInterruptId + { + // ASSP or first-level Interrupt IDs + EAsspIntIdA=0, + EAsspIntIdB=1, + EAsspIntIdC=2, + EAsspIntIdD=3, + EAsspIntIdE=4, + // ... + EAsspIntIdUsb=11, + EAsspIntIdDma=12, + // ... + EAsspIntIdZ=25 + };