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http://forum.raisonance.com/profile.php?id=31933 2012-05-08T06:41:10Z http://forum.raisonance.com/viewtopic.php?id=4558&action=new

such as sin(), expf() and the like are using double by default, which means that if you use them your code be big and slow! So consider using the float versions of these functions (with a "f" suffix) such as sinf() or cosf(). These will make good use of the FPU capabilities. - If you use multiple independent tasks that use floats, such as if you use floating-point in the foreground of your application as well as in interrutps; or if you use an RTOS with several tasks that perform floating-point arithmetic, you will be in trouble: The FPU state has to be preserved between its different uses, as it is not reentrant! This may lead to complex code or inefficiencies. - The GCC toolchain offers 3 ways to handle floating-point on STM32F4xx: Emulated float (-mfloat-abi=soft option) which disables the FPU; Hardware FPU with standard EABI parameter passing (-mfloat-abi=softfp option); and hardware FPU with specific parameter passing (-mfloat-abi=hard option). Choosing the right one between these 3 options depends on your application and its requirements. Remember that floating-point computing on emebedded systems requires some care, so you should only use it if necessary. In particular, be wary of the float comparisons, which are not absolute (an "epsilon" difference may exist), also some operations may generate exceptions, infinities, Not-a-Number...]]>

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http://forum.raisonance.com/profile.php?id=608 2012-04-19T09:23:45Z http://forum.raisonance.com/viewtopic.php?id=4531&action=new

PacketType) { /* Do work */ } else if (DataLinkEventParams.LinkState == packetInfo->PacketType) { /* Do different work */ } /* else, do no work */ } [/code] Here is the assembly generated by the compiler: [code] ; FUNCTION ?doPacketProcessing?MY_MODULE?S (BEGIN) ; Register XW is assigned to parameter packetInfo 0000 88 PUSH A 0001 B600 F LD A,DataLinkEventParams 0003 F1 CP A,(X) 0004 2E03 JRSGE ?ELSE_0036 ; Doing a signed compare! ; SOURCE LINE # 609 ; Do Work 0009 ?ELSE_0036: ; SOURCE LINE # 611 0009 B600 F LD A,DataLinkEventParams 000B F1 CP A,(X) 000C 265E JRNE ?NXT_0039 ;... [/code] Note that I have been able to workaround this problem by casting EventType to a uint8_t before doing the compare, but I would rather not have to do this. Any help would be appreciated.]]>

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