Remember to enable the FPU

Author: ckormanyos

ref_app/src/mcal/r7fa4m1ab/mcal_cpu.cpp

@@ -6,9 +6,9 @@
 //
 
 #include <mcal_cpu.h>
-#include <mcal_gpt.h>
 #include <mcal_osc.h>
 #include <mcal_port.h>
+#include <mcal_reg.h>
 #include <mcal_wdg.h>
 
 auto mcal::cpu::post_init() noexcept -> void
@@ -17,6 +17,12 @@ auto mcal::cpu::post_init() noexcept -> void
 
 auto mcal::cpu::init() -> void
 {
+  // Initialize the fpu: Enable cp10 and cp11.
+  mcal::reg::reg_access_static<std::uint32_t,
+                               std::uint32_t,
+                               mcal::reg::scb_cpacr,
+                               static_cast<std::uint32_t>(UINT32_C(0x00F00000))>::reg_or();
+
   mcal::wdg::init(nullptr);
   mcal::port::init(nullptr);
   mcal::osc::init(nullptr);

ref_app/src/mcal/r7fa4m1ab/mcal_reg.h

@@ -14,13 +14,22 @@
   {
     namespace reg
     {
-      // Register bases.
+      // Global base addresses.
+      constexpr std::uint32_t scs_base            { UINT32_C(0xE000E000) };
+
+      // Individual unit base addresses.
+      constexpr std::uint32_t scb_base            { scs_base + UINT32_C(0x00000D00) };
       constexpr std::uint32_t system_base         { UINT32_C(0x4001E000) };
       constexpr std::uint32_t unknown_hococr2     { UINT32_C(0x4001E037) };
       constexpr std::uint32_t pfs_base            { UINT32_C(0x40040800) };
       constexpr std::uint32_t pmisc_base          { UINT32_C(0x40040D00) };
 
-      // System registers.
+      // Core system registers.
+      constexpr std::uint32_t scb_cpacr           { scb_base + UINT32_C(0x00000088) };
+
+     static_assert(scb_cpacr == UINT32_C(0xE000ED88), "Error: wrong scb_cpacr register address)");
+
+      // System (system struct) registers.
       constexpr std::uint32_t system_sckdivcr     { system_base + UINT32_C(0x00000020) };
       constexpr std::uint32_t system_sckscr       { system_base + UINT32_C(0x00000026) };
       constexpr std::uint32_t system_memwait      { system_base + UINT32_C(0x00000031) };