Dear support
I am trying to run a fpu instructions on STM32H503CBU6 microcontroller. When I check the values on the FPU registers, it remains 0x00000000 with respect to the particular S<n> registers that I'm trying to use.
Please see the snapshot below.
Here is the assembly code that I use to test the fpu register:
ldr r0,=a0_coeff ldr r1,[r0] vmov s1,r1 vcvt.u32.f32 s1,s1 vmov r2,s1 movw r3,#4096 vmov s15,r3 vcvt.f32.u32 s15,s15 vmov r0,s15 vcvt.u32.f32 s15,s15 vmov r1,s15 bx lr
This is the code also to enable the FPU on the microcontroller:
FPU_Enable ldr r0,=0xE000ED88 ;CPACR ldr r1,[r0] ldr r2,=0xFF0FFFFF ;Masking Bits(Clear Bits 23:20) and r3,r2,r1 ldr r2,=0x00F00000 ;Masking Bits(Sets Bits 23:20) orr r3,r3,r2 str r3,[r0]
dsb isb ; Reset pipeline now the FPU is enabled.
bx lr
Hope someone can help me out because I am planning to program a code to run an IIR Filter equation using assembly language.
Thanks and best regards