More modernization Examples Chap 9

Author: ckormanyos

examples/chapter04_04a/target/micros/avr/make/avr.ld

@@ -1,5 +1,5 @@
 /*
- Copyright Christopher Kormanyos 2007 - 2023.
+ Copyright Christopher Kormanyos 2007 - 2025.
  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)
@@ -12,6 +12,10 @@ INPUT(libc.a libm.a libgcc.a)
 OUTPUT_FORMAT("elf32-avr","elf32-avr","elf32-avr")
 OUTPUT_ARCH(avr:5)
 
+/* The beginning and end of the program ROM area. */
+_rom_begin = 0x00000000;
+_rom_end   = 0x00007FFC;
+
 /* The beginning and end (i.e., top) of the stack */
 /* Set up a stack with a size of 0x180=(3/8)K */
 _stack_begin = 0x00800780;
@@ -22,9 +26,8 @@ __initial_stack_pointer = 0x00800900 - 2;
 
 MEMORY
 {
-  VEC(rx)  : ORIGIN = 0x00000000, LENGTH = 0x00000080
-  ROM(rx)  : ORIGIN = 0x00000080, LENGTH = 32K - 0x00000080
-  RAM(rwx) : ORIGIN = 0x00800100, LENGTH = 0x00000780 - 0x00000100
+  ROM(rx)   : ORIGIN = 0, LENGTH = 32K - 4
+  RAM(rw!x) : ORIGIN = 0x00800100, LENGTH = 0x00000780 - 0x00000100
 }
 
 SECTIONS
@@ -38,7 +41,7 @@ SECTIONS
     *(.isr_vector)
     . = ALIGN(0x10);
     KEEP(*(.isr_vector))
-  } > VEC = 0x5555
+  } > ROM = 0xAAAA
 
   /* Startup code */
   .startup :
@@ -67,6 +70,11 @@ SECTIONS
     . = ALIGN(2);
   } > ROM
 
+  .text :
+  {
+    . = ALIGN(0x10);
+  } > ROM = 0xAAAA
+
   . = 0x00800100;
   . = ALIGN(2);
 
@@ -80,7 +88,7 @@ SECTIONS
     *(.data*)
     . = ALIGN(2);
     KEEP (*(.data*))
-    *(.rodata)  /* Use special handling of rodata (i.e., as part of data since _const_ variables are stored in RAM for AVR arch). */
+    *(.rodata)  /* Do *NOT* move this! Include .rodata here if gcc is used with -fdata-sections. */
     . = ALIGN(2);
     KEEP (*(.rodata))
     *(.rodata*)

examples/chapter04_04a/target/micros/avr/make/avr_flags.gmk

@@ -12,6 +12,7 @@
 ifneq ($(MAKE),make)
 GCC_VERSION   = 15.1.0
 endif
+
 GCC_TARGET    = avr
 GCC_PREFIX    = avr
 
@@ -33,7 +34,7 @@ endif
 TGT_CFLAGS    = -std=c11                                                          \
                 $(TGT_ALLFLAGS)
 
-TGT_CXXFLAGS  = -std=c++14                                                        \
+TGT_CXXFLAGS  = -std=c++20                                                        \
                 $(TGT_ALLFLAGS)
 
 TGT_INCLUDES  = -I$(PATH_APP)/util/STL

examples/chapter09_08/src/mcal/avr/mcal_led_sys_start_interface.cpp

@@ -1,5 +1,5 @@
 ///////////////////////////////////////////////////////////////////////////////
-//  Copyright Christopher Kormanyos 2017 - 2018.
+//  Copyright Christopher Kormanyos 2017 - 2025.
 //  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)

examples/chapter09_08/src/sys/start/sys_start.cpp

@@ -1,5 +1,5 @@
 ///////////////////////////////////////////////////////////////////////////////
-//  Copyright Christopher Kormanyos 2007 - 2023.
+//  Copyright Christopher Kormanyos 2007 - 2025.
 //  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)