More r4 minima

.github/workflows/real-time-cpp.yml

@@ -176,7 +176,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        suite: [ am335x, bcm2835_raspi_b, lpc11c24, nxp_imxrt1062, rpi_pico_rp2040, rpi_pico2_rp2350, stm32f100, stm32f407, stm32f429, stm32f446, stm32h7a3, stm32l100c, stm32l152, stm32l432 ]
+        suite: [ am335x, bcm2835_raspi_b, lpc11c24, nxp_imxrt1062, r7fa4m1ab, rpi_pico_rp2040, rpi_pico2_rp2350, stm32f100, stm32f407, stm32f429, stm32f446, stm32h7a3, stm32l100c, stm32l152, stm32l432 ]
     steps:
       - uses: actions/checkout@v4
         with:

ref_app/cmake/r7fa4m1ab.cmake

@@ -0,0 +1,73 @@
+##############################################################################
+#  Copyright Christopher Kormanyos 2021 - 2026.
+#  Distributed under the Boost Software License,
+#  Version 1.0. (See accompanying file LICENSE_1_0.txt
+#  or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#
+# MIT License
+#
+# Copyright (c) 2019 Joel Winarske
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+
+set(APP ref_app)
+
+set(CMAKE_EXECUTABLE_SUFFIX .elf)
+
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_STANDARD 14)
+
+set(TARGET_INCLUDES
+    ${PATH_APP}/util/STL
+)
+
+set(_TARGET_CFLAGS
+    -finline-functions
+    -finline-limit=32
+    -mcpu=cortex-m4
+    -mtune=cortex-m4
+    -mthumb
+    -mfloat-abi=hard
+    -mfpu=fpv4-sp-d16
+    -ffast-math
+    -mno-unaligned-access
+    -mno-long-calls
+)
+
+set(TARGET_AFLAGS "")
+
+set(_TARGET_LDFLAGS
+    -nostdlib
+    -nostartfiles
+    -T ${LINKER_DEFINITION_FILE}
+)
+
+string(REPLACE ";" " " TARGET_CFLAGS "${_TARGET_CFLAGS}")
+string(REPLACE ";" " " TARGET_LDFLAGS "${_TARGET_LDFLAGS}")
+
+
+set(FILES_TARGET
+    ${PATH_APP}/mcal/mcal_gcc_cxx_completion
+    ${PATH_TGT}/startup/crt0
+    ${PATH_TGT}/startup/crt0_init_ram
+    ${PATH_TGT}/startup/crt1
+    ${PATH_TGT}/startup/int_vect
+)

ref_app/ref_app.vcxproj

@@ -3486,6 +3486,10 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </None>
+    <None Include="cmake\r7fa4m1ab.cmake">
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
+    </None>
     <None Include="cmake\riscvfe310.cmake">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>

ref_app/ref_app.vcxproj.filters

@@ -3353,6 +3353,9 @@
     <None Include="tools\Util\msys64\usr\local\llvm-17.0.2-riscv32\COPYING">
       <Filter>tools\Util\msys64\usr\local\llvm-17.0.2-riscv32</Filter>
     </None>
+    <None Include="cmake\r7fa4m1ab.cmake">
+      <Filter>src\cmake</Filter>
+    </None>
   </ItemGroup>
   <ItemGroup>
     <Text Include="CMakeLists.txt" />

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) };