LPCXpresso IDEのトピックProblem with optimized build https://community.nxp.com/t5/LPCXpresso-IDE/Problem-with-optimized-build/m-p/596899#M32018 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by PhysicsGuy on Thu Apr 04 06:30:12 MST 2013</STRONG><BR /><SPAN>Hi Guys,</SPAN><BR /><BR /><SPAN>I have a little problem with an optimized build on an lpc1769.</SPAN><BR /><SPAN>The situation is the following. In main, I loop in a while loop, that does nothing but check whether a certain variable is set and when it is set, it calls a function. So</SPAN><BR /><BR /><SPAN>while(1==1) {</SPAN><BR /><SPAN>if(somevariable==1) do_something();</SPAN><BR /><SPAN>}</SPAN><BR /><BR /><SPAN>Some variable is set and unset by an external interrupt. Now comes the problem. When I compile with -O1 or higher, the </SPAN><BR /><SPAN>compiler puts somevariable in a register first and then keep checking the register. However, the interrupt routine ofcourse</SPAN><BR /><SPAN>does not alter the register value, but rather the value in memory. How can I prevent this from happening? Can I tell the compiler to not make that specific optimization?</SPAN><BR /><BR /><SPAN>thanks!</SPAN></BODY></HTML> Wed, 15 Jun 2016 22:59:56 GMT lpcware 2016-06-15T22:59:56Z Problem with optimized build https://community.nxp.com/t5/LPCXpresso-IDE/Problem-with-optimized-build/m-p/596899#M32018 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by PhysicsGuy on Thu Apr 04 06:30:12 MST 2013</STRONG><BR /><SPAN>Hi Guys,</SPAN><BR /><BR /><SPAN>I have a little problem with an optimized build on an lpc1769.</SPAN><BR /><SPAN>The situation is the following. In main, I loop in a while loop, that does nothing but check whether a certain variable is set and when it is set, it calls a function. So</SPAN><BR /><BR /><SPAN>while(1==1) {</SPAN><BR /><SPAN>if(somevariable==1) do_something();</SPAN><BR /><SPAN>}</SPAN><BR /><BR /><SPAN>Some variable is set and unset by an external interrupt. Now comes the problem. When I compile with -O1 or higher, the </SPAN><BR /><SPAN>compiler puts somevariable in a register first and then keep checking the register. However, the interrupt routine ofcourse</SPAN><BR /><SPAN>does not alter the register value, but rather the value in memory. How can I prevent this from happening? Can I tell the compiler to not make that specific optimization?</SPAN><BR /><BR /><SPAN>thanks!</SPAN></BODY></HTML> Wed, 15 Jun 2016 22:59:56 GMT https://community.nxp.com/t5/LPCXpresso-IDE/Problem-with-optimized-build/m-p/596899#M32018 lpcware 2016-06-15T22:59:56Z Re: Problem with optimized build https://community.nxp.com/t5/LPCXpresso-IDE/Problem-with-optimized-build/m-p/596900#M32019 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by TheFallGuy on Thu Apr 04 07:05:32 MST 2013</STRONG><BR /><SPAN>Read this FAQ:</SPAN><BR /><A href="http://">http://support.code-red-tech.com/CodeRedWiki/CompilerOptimization</A></BODY></HTML> Wed, 15 Jun 2016 22:59:57 GMT https://community.nxp.com/t5/LPCXpresso-IDE/Problem-with-optimized-build/m-p/596900#M32019 lpcware 2016-06-15T22:59:57Z