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osPiRawWriteIo
osPiRawReadIo
Format#include <ultra64.h> s32 osPiRawWriteIo(u32 devAddr, u32 data); s32 osPiRawReadIo(u32 devAddr, u32 *data);What These Functions Do
The osPiRawStartDma, osPiRawWriteIo, osPiRawReadIo, and osPiGetStatus provide low-level, unmanaged access to the peripheral interface (PI). The peripheral interface (PI) is responsible for the transport of data between RDRAM and bulk-storage devices (BSD) such as ROM, RAM, CD-ROM, and other technologies. These functions provide low-level, unmanaged access to the PI; that is, they do not use the PI manager.
These functions should be used only when it is ensured that there is no other services using the PI. For this reason, Nintendo strongly recommends that "cooked" or managed, high-level PI access routines be used for most purposes; see osPiStartDma for details on this functionality. The raw routines may be useful, however, immediately after the application boot procedure is entered and before the operating system is initialized.
The osPiRawWriteIo routine performs a 32-bit programmed IO write to the PI device address specified by the devAddr argument. It polls the interface for idleness before performing the operation.
The osPiRawReadIo routine performs a 32-bit programmed IO read from the PI device address specified by devAddr and returns the value in data. It also polls the interface for idleness before performing the operation. Note that the device address devAddr must be two-byte aligned.
See Also
osPiRawStartDma
osPiGetStatus
osPiStartDma
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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 |