Merge pull request #1 from Sensirion/initial-driver

Initial SCD30 driver

.gitignore

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+*.o
+/release
+/scd30/scd_git_version.c
+/scd30/scd30_example_usage_hw_i2c
+/scd30/scd30_example_usage_sw_i2c

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "embedded-common"]
 	path = embedded-common
-	url = ./embedded-common
+	url = https://github.com/Sensirion/embedded-common.git

AUTHORS

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+Andreas Brauchli <[email protected]>

LICENSE

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+BSD 3-Clause License
+
+Copyright (c) 2018, Sensirion AG
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Makefile

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+drivers=scd30
+clean_drivers=$(foreach d, $(drivers), clean_$(d))
+release_drivers=$(foreach d, $(drivers), release/$(d))
+
+.PHONY: FORCE all $(release_drivers) $(clean_drivers)
+
+all: $(drivers)
+
+$(drivers): scd30/scd_git_version.c FORCE
+	cd $@ && $(MAKE) $(MFLAGS)
+
+scd30/scd_git_version.c: FORCE
+	git describe --always --dirty | \
+		awk 'BEGIN \
+		{print "/* THIS FILE IS AUTOGENERATED */"} \
+		{print "#include \"scd_git_version.h\""} \
+		{print "const char * SCD_DRV_VERSION_STR = \"" $$0"\";"} \
+		END {}' > $@
+
+$(release_drivers): scd30/scd_git_version.c
+	export rel=$@ && \
+	export driver=$${rel#release/} && \
+	export tag="$$(git describe --always --dirty)" && \
+	export pkgname="$${driver}-$${tag}" && \
+	export pkgdir="release/$${pkgname}" && \
+	rm -rf "$${pkgdir}" && mkdir -p "$${pkgdir}" && \
+	cp -r embedded-common/* "$${pkgdir}" && \
+	cp -r $${driver}/* "$${pkgdir}" && \
+	perl -pi -e 's/^sensirion_common_dir :=.*$$/sensirion_common_dir := ./' "$${pkgdir}/Makefile" && \
+	cd "$${pkgdir}" && $(MAKE) $(MFLAGS) && $(MAKE) clean $(MFLAGS) && cd - && \
+	cd release && zip -r "$${pkgname}.zip" "$${pkgname}" && cd - && \
+	ln -sf $${pkgname} $@
+
+release: clean $(release_drivers)
+
+$(clean_drivers):
+	export rel=$@ && \
+	export driver=$${rel#clean_} && \
+	cd $${driver} && $(MAKE) clean $(MFLAGS) && cd -
+
+clean: $(clean_drivers)
+	rm -rf release scd30/scd_git_version.c

README.md

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+# embedded-scd
+This repository contains the embedded driver sources for Sensirion's SCD product
+line.
+
+## Clone this repository
+```
+ git clone --recursive https://github.com/Sensirion/embedded-scd.git
+```
+
+## Repository content
+* embedded-common (submodule repository for the common embedded driver HAL)
+* scd30 (SCD30 driver related)
+
+## Collecting resources
+```
+make release
+```
+This will create the `release` folder with the necessary driver files in it,
+including a Makefile. That way, you have just one folder with all the sources
+ready to build your driver for your platform.
+
+## Files to adjust (from embedded-common)
+You only need to touch the following files:
+
+* `sensirion_arch_config.h` (architecture specifics, you need to specify
+the integer sizes)
+
+and depending on your i2c implementation either of the following:
+
+* `embedded-common/hw_i2c/sensirion_hw_i2c_implementation.c`
+  functions for hardware i2c communication if your platform supports that
+* `embedded-common/sw_i2c/sensirion_sw_i2c_implementation.c`
+  functions for software i2c communication via GPIOs
+
+## Building the driver
+1. Adjust sensirion\_arch\_config.h if you don't have the `<stdint.h>` header
+   file available
+2. Implement necessary functions in one of the `*_implementation.c` files
+   described above
+3. make
+
+---
+
+Please check the [embedded-common](https://github.com/Sensirion/embedded-common)
+repository for further information and sample implementations.
+
+---

scd30/Makefile

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+sensirion_common_dir := ../embedded-common
+scd_common_dir := .
+sw_i2c_dir := ${sensirion_common_dir}/sw_i2c
+hw_i2c_dir := ${sensirion_common_dir}/hw_i2c
+
+CFLAGS := -Os -Wall -Werror -I. -I${sensirion_common_dir}
+
+sensirion_common_objects := sensirion_common.o
+scd_common_objects := scd_git_version.o
+scd30_binaries := scd30_example_usage_sw_i2c scd30_example_usage_hw_i2c
+scd_binaries += ${scd30_binaries}
+
+sw_objects := sensirion_sw_i2c.o sensirion_sw_i2c_implementation.o
+hw_objects := sensirion_hw_i2c_implementation.o
+all_objects := ${sensirion_common_objects} ${scd_common_objects} ${hw_objects} ${sw_objects} scd30.o
+
+.PHONY: all
+
+all: ${scd_binaries}
+
+scd_git_version.o: ${scd_common_dir}/scd_git_version.c
+	$(CC) $(CFLAGS) -c -o $@ $^
+sensirion_common.o: ${sensirion_common_dir}/sensirion_common.c
+	$(CC) $(CFLAGS) -c -o $@ $^
+sensirion_sw_i2c_implementation.o: ${sw_i2c_dir}/sample-implementations/linux_user_space/sensirion_sw_i2c_implementation.c
+	$(CC) -I${sw_i2c_dir} $(CFLAGS) -c -o $@ $^
+sensirion_hw_i2c_implementation.o: ${hw_i2c_dir}/sensirion_hw_i2c_implementation.c
+	$(CC) $(CFLAGS) -c -o $@ $^
+
+sensirion_sw_i2c.o: ${sw_i2c_dir}/sensirion_sw_i2c.c
+	$(CC) -I${sw_i2c_dir} $(CFLAGS) -c -o $@ $^
+
+scd30.o: ${sensirion_common_dir}/sensirion_arch_config.h ${sensirion_common_dir}/sensirion_i2c.h ${scd_common_dir}/scd_git_version.c scd30.h scd30.c
+
+scd30_example_usage_sw_i2c: ${sensirion_common_objects} ${scd_common_objects} ${sw_objects} scd30.o
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LOADLIBES) $(LDLIBS) scd30_example_usage.c
+
+scd30_example_usage_hw_i2c: ${sensirion_common_objects} ${scd_common_objects} ${hw_objects} scd30.o
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LOADLIBES) $(LDLIBS) scd30_example_usage.c
+
+clean:
+	$(RM) ${all_objects} ${scd_binaries}