?? embedded systems device driver development - page 8 of 9.htm
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<DIV class=ts8p0><SPAN class=ft0p8></SPAN></DIV>
<DIV class=ts8p1><SPAN class=ft0p8></SPAN></DIV>
<DIV class=ts8p2><SPAN class=ft0p8>IAR Aug 2000 </SPAN></DIV>
<DIV class=ts8p4><SPAN class=ft0p8></SPAN></DIV>
<DIV class=ts8p5><SPAN class=ft1p8>Figure 5: Selection of driver functions
during code generation<SPAN class=ft2p8> </SPAN></SPAN></DIV>
<DIV class=ts8p7><SPAN class=ft3p8></SPAN></DIV>
<DIV class=ts8p8><SPAN class=ft3p8>The automatically generated device
driver functions can be used like any other source </SPAN></DIV>
<DIV class=ts8p10><SPAN class=ft3p8>code library; i.e. the functions can
be called in a suitable order from the application </SPAN></DIV>
<DIV class=ts8p11><SPAN class=ft3p8>program. </SPAN></DIV>
<DIV class=ts8p13><SPAN class=ft4p8>Device driver portability
</SPAN></DIV>
<DIV class=ts8p15><SPAN class=ft3p8>While the implementation of the device
driver functions are highly target-dependent and </SPAN></DIV>
<DIV class=ts8p18><SPAN class=ft3p8>non-portable, the name and parameter
list (the function prototypes) of the device driver </SPAN></DIV>
<DIV class=ts8p22><SPAN class=ft3p8>functions provided to the application
program can be fairly standardized, thus increasing </SPAN></DIV>
<DIV class=ts8p23><SPAN class=ft3p8>portability. </SPAN></DIV>
<DIV class=ts8p25><SPAN class=ft3p8></SPAN></DIV>
<DIV class=ts8p26><SPAN class=ft3p8>It is therefore possible to make
device drivers that appear to be portable to the </SPAN></DIV>
<DIV class=ts8p28><SPAN class=ft3p8>application program although the
implementation is highly non-portable. </SPAN></DIV>
<DIV class=ts8p32><SPAN class=ft3p8></SPAN></DIV>
<DIV class=ts8p33><SPAN class=ft3p8>By using tools like IAR MakeApp<SPAN
class=ft5p8>?? 快捷鍵說明
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