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Build System

Mira comes with a build system based on GNU Makefiles to build, link and flash the example applications. It assumes the needed programs are in the program search path (PATH).

Example

A minimal Makefile using Mira's build system is: 

PROJECT_NAME = our_app

TARGET ?= nrf52832ble-os
LIBDIR ?= $(CURDIR)/../../..

SOURCE_FILES = \
        main.c

include $(LIBDIR)/Makefile.include

Variables

The following variables can be set in makefiles (or on the command line to make):

  • CFLAGS - arguments passed to the compiler.
  • LDSCRIPT - the name of the linker script used (default depends on TARGET).
  • LDSCRIPT_DIR - where $(LDSCRIPT) is (default depends on TARGET).
  • LIBDIR - dir where the mira archive is.
  • LIBNAME - default libmira.a, usualy never changed.
  • PROJECT_NAME - the name of the project. It becomes part of the generated output files.
  • SOURCE_FILES - the source files, subdirectories also works.
  • TARGET - a pair of MCU and library type, available targets can be seen in the $(LIBDIR)/platforms dir.
  • V - set to 1 to turn on verbose output from make.

Extra variables for nRF52 targets

  • APPROTECT_DISABLED - set to yes to disable setting app protect.
  • ISR_VECTOR_FILE - for nrf52-targets, set when a custom isr_vector.c file is used.
  • LFCLK_SOURCE - valid values are CRYSTAL, EXTERNAL_BYPASS_ENABLED and EXTERNAL_BYPASS_DISABLED. Used to control LFCLK source.

Extra variables for mkw41z targets

  • STARTUP_FILE - points out the startup_MKW41Z4.S file, if not provided uses a default one.

make targets

all (the default target) and target

Builds a hex and elf file for the application. The names will be $(PROJECT_NAME)-$(TARGET).elf/hex.

To build for a different target, either update the TARGET line in the Makefile or write TARGET=mkw41z-os, TARGET=nrf52840ble-os etc after make.

flashall

builds (if needed) and tries to flash all connected boards.

flash.serial

Use this target to flash a single board. Available serial numbers can be shown with:

$ nrfjprog --ids
987654321
123456789
000112233

To flash the board with ID 123456789 run: make flash.123456789.

flashbut.serial

This target flashes all connected boards, except the one with the provided serial number.

clean

The clean target removes the files that are created for the current $(TARGET).

C definitions/macros

  • MIRA_STACK_CONFIG_OS - for *-os targets

Extra definitions For mkw41z

  • MIRA_PLATFORM_MKW41Z

Extra definitions for nrf52832

  • MIRA_PLATFORM_NRF52832BLE
  • NRF52832_XXAA

Extra definitions for nrf52840

  • MIRA_PLATFORM_NRF52840BLE
  • NRF52840_XXAA
  • MIRA_MULTICHAN_AVAILABLE
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