??????ARM MDK ?????STM32F4xx ????????
?. ???
?й????????Keil ????????STM32F4xx ?????????? ?????????????????????????????Щ?????????????о?о???????????????????????????????????????????????????????????????????????????????
??????????????
1. ------????Keil MDK Version 5 ?汾?? ???????????????STM32F4xx ??FPU??????????????????????
???о????????????????
2. ------????Keil MDK Version 4 ?汾?? ??汾v4?????統?keil ???????????v4.74.0.0 ?汾???????
FPU????????????о?????????????????????汾v4????v4.23.0.0 ?汾?? ??????????????????
???á?
??. ??ν??????
1. ?????Keil ?汾??????FPU???????????Keil ???????????0xE000ED88 ???????????
????0x00F00000?? ???????????FPU????????????
2. ???0xE000ED88????????0x00000000??????????????????
a. ??system_stm32f4xx.c????е?systeminit()???????????????????
/* FPU settings------------------------------------------------------------*/
#if (__FPU_PRESENT == 1) &&(__FPU_USED == 1)
SCB->CPACR |= ((3UL << 10*2)|(3UL<< 11*2)); /* set CP10 and CP11 Full Access */
#endif
b. ????????Project->Optionsfor target "XXXX"???е?C/C++?????Define ?м???????????
??????????
__FPU_PRESENT=1,__FPU_USED =1??
c. ????????????????????FPU ?????CPU ??????????Ч?????FPU ???м??????????
3. ???????????о???????????????
??????????????????????????????????????????????
a. ????arm_math.h??????
b. ?????????C/C++?????define ?м??????????ARM_MATH_CM4??
c. ?????????C/C++?????define ?м??????????__CC_ARM??
?????sin??cos ????????????????arm_sin_f32()???arm_cos_f32()??????????????????
arm_sin_f32.c ??arm_cos_f32.c?У??????????м?????????c ?????
* ?? ST ????????е???????????
\stm32f4_dsp_stdperiph_lib\STM32F4xx_DSP_StdPeriph_Lib_V1.1.0\Libraries\CMSIS\DSP_Lib\Sou
rce\FastMathFunctions
* ??keil ??????????????????
\Keil\ARM\CMSIS\DSP_Lib\Source\FastMathFunctions
???????????????? ?翪????????????????????????????????????????м???ARM ?е?????????arm_cortexM4lf_math.lib????????????????????????
* ?? ST ????????е????????
\STM32F4xx_DSP_StdPeriph_Lib_V1.6.0\STM32F4xx_DSP_StdPeriph_Lib_V1.6.0\Libraries\CMSIS\Lib\ARM
* ??keil ??????????????????
\Keil\ARM\CMSIS\Lib\ARM
??.????
?????Ч?????????????????????????????????ü??Ч??????????????????????????????????Ч??????Ч?????????
STM32/STM8 ??????/ST/STM
????admin ?????????2019-01-03
