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EPICS Device Support Library

EPICS Device Support Library. Motivating factors Quick tour of the API Some examples. Motivating Factors. Detect conflicting use of memory mapped IO and interrupt resources Print address maps and interrupt vector maps Abstract interface improves portability of device drivers.

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EPICS Device Support Library

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  1. EPICS Device Support Library • Motivating factors • Quick tour of the API • Some examples

  2. Motivating Factors • Detect conflicting use of memory mapped IO and interrupt resources • Print address maps and interrupt vector maps • Abstract interface improves portability of device drivers

  3. Type Codes for Address Spaces We Use typedef enum { atVMEA16, atVMEA24, atVMEA32, atISA, /* memory mapped ISA access (until now only on PC) */ atLast /* atLast must be the last enum in this list */ } epicsAddressType;

  4. Register / Map Address Range of Memory Mapped IO long devRegisterAddress( const char *pOwnerName, epicsAddressType addrType, void *baseAddress, unsigned long size, /* bytes */ void **pLocalAddress);

  5. Unregister Address Range of Memory Mapped IO long devUnregisterAddress( epicsAddressType addrType, void *baseAddress, const char *pOwnerName);

  6. Type Codes For Interrupt Vector Spaces typedef enum {intCPU, intVME, intVXI} epicsInterruptType;

  7. Connect to an Interrupt long devConnectInterrupt( epicsInterruptType intType, unsigned vectorNumber, void (*pFunction)(), void *parameter)

  8. Disconnect from an Interrupt /* * * The parameter pFunction should be set to the C function pointer that * was connected. It is used as a key to prevent a driver from inadvertently * removing an interrupt handler that it didn't install */ long devDisconnectInterrupt( epicsInterruptType intType, unsigned vectorNumber, void (*pFunction)());

  9. Enable and Disable Interrupt Levels long devEnableInterruptLevel( epicsInterruptType intType, unsigned level); long devDisableInterruptLevel( epicsInterruptType intType, unsigned level);

  10. Print Address Map long devAddressMap(void)

  11. Print Interrupt Vector Map veclist()

  12. Examples (Unfortunately Only a Few in EPICS Base) <epics>\base\src\drv\ansi\drvAb.c(895): status = devRegisterAddress("drvAb",atVMEA24,(void *)p6008, <epics>\base\src\drv\ansi\drvEpvxi.c(513): status = devRegisterAddress( <epics>\base\src\drv\ansi\drvEpvxi.c(525): status = devRegisterAddress( <epics>\base\src\drv\old\drvBitBus.c(317): if (devRegisterAddress("Xycom Bitbus", atVMEA16, (void*)BaseAddr, sizeof(XycomBBRegsStruct), NULL) != 0) <epics>\base\src\drv\old\drvBitBus.c(327): if (devRegisterAddress("PEP Bitbus", atVMEA16, (void*)BaseAddr, sizeof(PepBBRegsStruct), NULL) != 0)

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