JayKickliter

diff --git a/userland/Configuration.mk b/userland/Configuration.mk
index 47e5d9c8..43e41e5c 100644
--- a/userland/Configuration.mk
+++ b/userland/Configuration.mk
@@ -43,7 +43,7 @@ override ASFLAGS += -mthumb
 override CFLAGS  += -std=gnu11
 override CPPFLAGS += \
 	    -frecord-gcc-switches\
-	    -g\
+	    -gdwarf-2\

JayKickliter

Debugging nRF52DK MBed applications with GDB

Step 1 (one time only): replace MBed bootloader with JLink bootloader

1. Power down nRF52DK
2. Power up nRF52DK while holding down IF BOOT/RESET button
3. Drag JLink bootloader binary to BOOTLOADER volume
4. Power-cycle

At this point, the MBed bootloader has been replaced with JLink's.

JayKickliter

Guides to using C++ and Newlib-nano on bare-metal targets

• Shrink Your MCU code size with GCC ARM Embedded 4.7
• Practical Guide to Bare Metal C++
• C++ On Embedded Systems

JayKickliter

AlignAfterOpenBracket: Align # If true, horizontally aligns arguments after an open bracket.
AlignConsecutiveAssignments: true #  This will align the assignment operators of consecutive lines
AlignConsecutiveDeclarations: true # This will align the declaration names of consecutive lines
AlignTrailingComments: true
AllowAllParametersOfDeclarationOnNextLine: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: Empty
AllowShortIfStatementsOnASingleLine: false
AllowShortLoopsOnASingleLine: false
AlwaysBreakAfterReturnType: TopLevel

JayKickliter

# Make OBJS depend on CPP/C/CXX/LD flags 
$(OBJS): $(BUILDDIR)/flags.txt

# Creates a new flags.txt file when flags change
# make will detect this change and force a rebuild of
# all the sources
.PHONY: flags
$(BUILDDIR)/flags.txt: flags
	$(Q){                                  \
	TMP=`mktemp`;                          \

JayKickliter

arm-none-eabi-nm --size-sort --reverse --demangle --radix=d firmware_image.elf

JayKickliter

Just the version number

$ arm-none-eabi-gcc -dumpversion
5.3.1

Full version information

JayKickliter

#!/usr/bin/env sh

export TARGET=arm-none-eabi
export PREFIX=$HOME/.local
export PATH=$PATH:$PREFIX/bin

export VERSION=7.8.1
export GDB=gdb-$VERSION

rm -rf $GDB

JayKickliter

Q. Why are base interrupts separated from peripheral interrupts?

A. Because the linker keeps 'em separated:

/* Place vector table at the beginning of ROM.
 *
 * The first 16 entries in the ARM vector table are defined by ARM and
 * are common among all ARM chips. The remaining entries are
 * chip-specific, which Tock defines in a separate .irqs section

JayKickliter

Command line usage

pandoc pandoc --quiet -f gfm -s somefile.md

What the options mean:

1. --quiet: supress "[WARNING] This document format requires a nonempty <title> element."
2. -f gfm: input format is Github Flavored Markdown