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osal_io-h.md

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Openharmony v1.0 / docs / api / api-SmartVision-Devices

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# osal\_io.h
## **Overview**
**Related Modules:**
[OSAL](OSAL.md)
**Description:**
Declares I/O interfaces.
This file provides operations, such as reading data from and writing data into an I/O address space, remapping an I/O address space to its virtual address space, and unmapping an I/O virtual address associated with the physical address.
**Since:**
1.0
**Version:**
1.0
## **Summary**
## Macros

Macro Name and Value	Description
OSAL_WRITEB(value, address) writeb(value, address)	Writes one byte of data into an I/O address space.
OSAL_WRITEW(value, address) writew(value, address)	Writes a short integer into an I/O address space.
OSAL_WRITEL(value, address) writel(value, address)	Writes an integer into an I/O address space.
OSAL_READB(address) readb(address)	Reads one byte of data from an I/O address space.
OSAL_READW(address) readw(address)	Reads a short integer from an I/O address space.
OSAL_READL(address) readl(address)	Reads an integer from an I/O address space.

## Functions

Function Name	Description
OsalIoRemap (unsigned long phys_addr, unsigned long size)	static void * Remaps an I/O physical address to its virtual address.
OsalIoUnmap (void *addr)	static void Unmaps an I/O virtual address associated with the physical address.

Function Name

Description

OsalIoRemap (unsigned long phys_addr, unsigned long size)

static void *

Remaps an I/O physical address to its virtual address.

OsalIoUnmap (void *addr)

static void

Unmaps an I/O virtual address associated with the physical address.