參數(shù)資料
型號(hào)： AN2821
英文描述： eTPU Host Interface
中文描述： eTPU主機(jī)接口
文件頁(yè)數(shù)： 4/24頁(yè)
文件大?。?/td> 546K
代理商： AN2821
eTPU Host Interface, Rev. .1
Host Interface Software
4
Host Interface Software
Freescale Semiconductor
4
The function partition between the application software and low-level driver is defined during the software
architecture design. To make the software portable, the application software is normally designed to
interface with the low-level driver via abstracted interface APIs. The host interface of the eTPU functions
should be designed such that the implementation of the low-level driver is hidden from the application
software.
Once the application software interface to the low-level driver is defined, the functionality of the low-level
driver can be partitioned between host CPU and eTPU. The eTPU interface software running on the host
CPU is an integral part of the low-level driver. It handles the details of the interaction between host and
eTPU.
The eTPU code and host interface code are compiled by two different compilers. In order to resolve the
eTPU code symbol reference in the host code, it is necessary to export the symbolic information from the
eTPU compiler to the host compiler. Similarly, to build a single executable image, it is necessary to export
eTPU code image to the host compiler. Several types of information are exported from eTPU_C through
host interface files, generated from
#pragma write
statements during compilation. For detailed
information on
#pragma write
, see the eTPU_C documentation.
An example of application software and low-level driver partition is shown in
Code Example 1
.
4.1
Initialization Overview
The eTPU initialization is an important part of the host interface. At the power up, the host has to configure
the eTPU peripheral properly before the eTPU function can be executed. The eTPU initialization process
is accomplished by both host CPU and eTPU. During the initialization, the functional partition between
host CPU and eTPU is as follows:
Host Responsibility:
eTPU module initialization
eTPU channel configuration
Providing initial eTPU function parameters
Initiating the eTPU function execution
eTPU Responsibility:
Responding to the HSR
Transitioning into the initialization state
The eTPU initialization can be broken down into three steps: eTPU module initialization, eTPU channel
initialization and eTPU function initialization. The following sections discuss the interface design and the
data exchange between host CPU and eTPU for each step of initialization.
相關(guān)PDF資料
PDF描述
AN2848 Programming the eTPU
AN2897 Using the eTPU Angle Clock
AN2904FHQ AN2904FHQ - Sound input/output interface IC for digital still camera
AN2933 Understanding the eTPU Channel Hardware
AN30210A Analog IC
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