📄 embedded systems device driver development - page 3 of 9.htm
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<DIV class=ts3p0><SPAN class=ft0p3></SPAN></DIV>
<DIV class=ts3p1><SPAN class=ft0p3></SPAN></DIV>
<DIV class=ts3p2><SPAN class=ft0p3>IAR Aug 2000 </SPAN></DIV>
<DIV class=ts3p4><SPAN class=ft1p3>footnotes, and it can require
substantial efforts to make sure one is aware of, and can </SPAN></DIV>
<DIV class=ts3p5><SPAN class=ft1p3>handle, any changes to the new device.
</SPAN></DIV>
<DIV class=ts3p7><SPAN class=ft1p3></SPAN></DIV>
<DIV class=ts3p8><SPAN class=ft1p3>Design and implementation requires not
only programming experience but also </SPAN></DIV>
<DIV class=ts3p9><SPAN class=ft1p3>expertise in hardware design and
development tools. Coding is error-prone, as it can be </SPAN></DIV>
<DIV class=ts3p13><SPAN class=ft1p3>very difficult to initialize and
manipulate all configuration and status bits properly in the </SPAN></DIV>
<DIV class=ts3p16><SPAN class=ft1p3>correct sequence. </SPAN></DIV>
<DIV class=ts3p18><SPAN class=ft1p3></SPAN></DIV>
<DIV class=ts3p19><SPAN class=ft1p3>Debugging can prove to be particularly
tricky as the drivers may not work without </SPAN></DIV>
<DIV class=ts3p21><SPAN class=ft1p3>external hardware, and may need to
conform to timing constraints or other resource </SPAN></DIV>
<DIV class=ts3p22><SPAN class=ft1p3>limitations. They may need to run at
full speed and can sometimes not be single-stepped </SPAN></DIV>
<DIV class=ts3p25><SPAN class=ft1p3>in a debugger. </SPAN></DIV>
<DIV class=ts3p27><SPAN class=ft1p3></SPAN></DIV>
<DIV class=ts3p28><SPAN class=ft1p3>In practice, a fairly complete
hardware environment with a debug monitor or an emulator </SPAN></DIV>
<DIV class=ts3p30><SPAN class=ft1p3>is needed, as are additional
laboratory instruments such as an oscilloscope or a logic </SPAN></DIV>
<DIV class=ts3p31><SPAN class=ft1p3>analyser. A debug simulator can seldom
be used. </SPAN></DIV>
<DIV class=ts3p33><SPAN class=ft1p3></SPAN></DIV>
<DIV class=ts3p34><SPAN class=ft1p3>To summarize, hand-crafted device
driver development requires the following tasks: </SPAN></DIV>
<DIV class=ts3p38><SPAN class=ft1p3></SPAN></DIV>
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