i am trying to work with the fpu of the stm32f469-Disco and got some questions...
i am on ac6 systemworkbench/win7/
so far i can compile and run my app that uses float math...
when i look at the disassmbly it looks good: (as far as i can understand this, it uses the fpu-commands vadd.f32, vmul.f32 etc)
0800c842: beq.n 0x800c8cc <main()+588>
545 test = 1.0f / (float)(ix%4) + test;
0800c844: ldrh r3, [r7, #50] ; 0x32
0800c846: uxth r3, r3
0800c848: and.w r3, r3, #3
0800c84c: vmov s15, r3
0800c850: vcvt.f32.s32 s15, s15
0800c854: vmov.f32 s13, #112 ; 0x70
0800c858: vdiv.f32 s14, s13, s15
0800c85c: vldr s15, [r7, #44] ; 0x2c
0800c860: vadd.f32 s15, s14, s15
__FPU_USED is 0 because __VFP_FP__ is not defined (core_cm4.h line 149)
and SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2)); /* set CP10 and CP11 Full Access */
doesent get set
#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2)); /* set CP10 and CP11 Full Access */
shouldent this generate a FPU-FAULT?
and where can i define __VFP_FP__ ? putting in
many thanks for some enlightment!