參數(shù)資料
型號: AN2821
英文描述: eTPU Host Interface
中文描述: eTPU主機(jī)接口
文件頁數(shù): 8/24頁
文件大小: 546K
代理商: AN2821
eTPU Host Interface, Rev. .1
Software Integration
Freescale Semiconductor
8
function needs to check the validity of the parameters, write them to the eTPU data memory, and then issue
the host service request to inform eTPU that the parameters are newly updated. An example of the update
PWM function parameter is shown in
Code Example 7
(
etpu_pwm_update
(
)
)
.
5
Software Integration
The eTPU code and host CPU code are compiled and linked separately. The eTPU code needs to be built
first to generate and export the eTPU code image and parameter symbol information, as shown in
Code
Example 4
and
Code Example 5
. The host code needs to include these files properly to resolve all the
symbol reference between eTPU and host code. This software build dependency can be added easily to the
makefile to ensure the proper sequence.
6
Conclusion
The benefit of the host interface design is to isolate any hardware dependency from the application
software by means of the host interface API functions. In the eTPU host interface design, all the
interactions between host and eTPU are encapsulated in the interface API functions. With this interface
design, the implementation of the low-level driver can be hidden from the host application. In the PWM
example, the application software interfaces to a generic PWM driver with two control parameters: period
and duty cycle. When the eTPU implementation of the PWM is changed, the host application software
does not need to change. For the host application software, it does not make any difference if the low-level
PWM driver is implemented by using a general purpose discrete output, eMIOS timer channel, or eTPU
channel.
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