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osEPiRawReadIo
Format#include <ultra64.h> s32 osEPiRawReadIo( OSPiHandle *pihandle, u32 devAddr, u32 *data);What These Functions Do
The osEPiRawStartDma, osEPiRawWriteIo, osEPiRawReadIo, and osEPiGetDeviceType functions gain access to the expanded peripheral interface (EPI) without using the PI manager.However, these functions should be used only when other services including debug, print, logging, and profiling are not using the PI bus. Nintendo strongly recommends that the PI manager be used when using the EPI. Please see osEPiStartDma for more information.
The expanded peripheral interface (EPI) transfers data between RDRAM and a bulk storage device (BSD) such as ROM, Drive ROM, and the N64 Disk Drive. EPI supports many devices sharing the PI domain, and it can switch among these devices dynamically.
The OSPiHandle data structure acts as a handler for the EPI routine when referencing each PI device without using the PI manager. The OSPiHandle structure is allocated and initialized by each device's initialization routine. It is also used for saving each PI device attributes.
The osEPiRawReadIo routine performs a 32-bit IO Read operation from devAddr and stores the value to data. This routine also performs a polling operation to determine whether or not the interface is available before the operation. Note that four-byte alignment is necessary for devAddr.
Warning
osEPiRawStartDma, osEPiRawWriteIo, and osEPiRawReadIo reset the PI bus. If there is a discrepancy between the given PI bus setting specified by pihandle and the actual PI bus setting when the function is called. It is not necessary to call osCartRomInit each time.
See Also
osEPiRawStartDma
osEPiRawWriteIo
osEPiGetDeviceType
osPiRawStartDma
osPiStartDma
osEPiStartDma
osCartRomInit
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Nintendo® Confidential Warning: all information in this document is confidential and covered by a non-disclosure agreement. You are responsible for keeping this information confidential and protected. Nintendo will vigorously enforce this responsibility. Copyright © 1998 Nintendo of America Inc. All rights reserved Nintendo and N64 are registered trademarks of Nintendo Last updated January 1998 |