From 5b6fdce2732d4502425e6380029edfddb31a24e5 Mon Sep 17 00:00:00 2001
From: Sanchayan Maity <maitysanchayan@gmail.com>
Date: Thu, 13 Apr 2017 16:48:06 +0530
Subject: [PATCH] Add PWM demo code

Add PWM demo code. We use libsoc for handling PWM.
---
 pwm/.cproject                       | 65 +++++++++++++++++++++++++++++
 pwm/.gitignore                      |  1 +
 pwm/.project                        | 26 ++++++++++++
 pwm/.settings/language.settings.xml | 14 +++++++
 pwm/pwm.c                           | 61 +++++++++++++++++++++++++++
 5 files changed, 167 insertions(+)
 create mode 100644 pwm/.cproject
 create mode 100644 pwm/.gitignore
 create mode 100644 pwm/.project
 create mode 100644 pwm/.settings/language.settings.xml
 create mode 100644 pwm/pwm.c

diff --git a/pwm/.cproject b/pwm/.cproject
new file mode 100644
index 0000000..f3bae2b
--- /dev/null
+++ b/pwm/.cproject
@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<?fileVersion 4.0.0?><cproject storage_type_id="org.eclipse.cdt.core.XmlProjectDescriptionStorage">
+	<storageModule moduleId="org.eclipse.cdt.core.settings">
+		<cconfiguration id="cdt.managedbuild.config.gnu.cross.exe.debug.2021969369">
+			<storageModule buildSystemId="org.eclipse.cdt.managedbuilder.core.configurationDataProvider" id="cdt.managedbuild.config.gnu.cross.exe.debug.2021969369" moduleId="org.eclipse.cdt.core.settings" name="Debug">
+				<externalSettings/>
+				<extensions>
+					<extension id="org.eclipse.cdt.core.ELF" point="org.eclipse.cdt.core.BinaryParser"/>
+					<extension id="org.eclipse.cdt.core.GASErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+					<extension id="org.eclipse.cdt.core.GmakeErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+					<extension id="org.eclipse.cdt.core.GLDErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+					<extension id="org.eclipse.cdt.core.CWDLocator" point="org.eclipse.cdt.core.ErrorParser"/>
+					<extension id="org.eclipse.cdt.core.GCCErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+				</extensions>
+			</storageModule>
+			<storageModule moduleId="cdtBuildSystem" version="4.0.0">
+				<configuration artifactName="${ProjName}" buildArtefactType="org.eclipse.cdt.build.core.buildArtefactType.exe" buildProperties="org.eclipse.cdt.build.core.buildArtefactType=org.eclipse.cdt.build.core.buildArtefactType.exe,org.eclipse.cdt.build.core.buildType=org.eclipse.cdt.build.core.buildType.debug" cleanCommand="rm -rf" description="" id="cdt.managedbuild.config.gnu.cross.exe.debug.2021969369" name="Debug" parent="cdt.managedbuild.config.gnu.cross.exe.debug">
+					<folderInfo id="cdt.managedbuild.config.gnu.cross.exe.debug.2021969369." name="/" resourcePath="">
+						<toolChain id="cdt.managedbuild.toolchain.gnu.cross.exe.debug.820647595" name="Cross GCC" superClass="cdt.managedbuild.toolchain.gnu.cross.exe.debug">
+							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="cdt.managedbuild.targetPlatform.gnu.cross.548900668" isAbstract="false" osList="all" superClass="cdt.managedbuild.targetPlatform.gnu.cross"/>
+							<builder buildPath="${workspace_loc:/pwm}/Debug" id="cdt.managedbuild.builder.gnu.cross.1375415820" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" superClass="cdt.managedbuild.builder.gnu.cross"/>
+							<tool command="${CC}" id="cdt.managedbuild.tool.gnu.cross.c.compiler.1368914442" name="Cross GCC Compiler" superClass="cdt.managedbuild.tool.gnu.cross.c.compiler">
+								<option defaultValue="gnu.c.optimization.level.none" id="gnu.c.compiler.option.optimization.level.698258441" name="Optimization Level" superClass="gnu.c.compiler.option.optimization.level" useByScannerDiscovery="false" valueType="enumerated"/>
+								<option id="gnu.c.compiler.option.debugging.level.1327264068" name="Debug Level" superClass="gnu.c.compiler.option.debugging.level" useByScannerDiscovery="false" value="gnu.c.debugging.level.max" valueType="enumerated"/>
+								<option id="gnu.c.compiler.option.misc.other.1221019590" name="Other flags" superClass="gnu.c.compiler.option.misc.other" useByScannerDiscovery="false" value="${CFLAGS} -c --sysroot=/usr/local/oecore-x86_64/sysroots/armv7at2hf-neon-angstrom-linux-gnueabi/" valueType="string"/>
+								<inputType id="cdt.managedbuild.tool.gnu.c.compiler.input.1557145701" superClass="cdt.managedbuild.tool.gnu.c.compiler.input"/>
+							</tool>
+							<tool id="cdt.managedbuild.tool.gnu.cross.cpp.compiler.1069541434" name="Cross G++ Compiler" superClass="cdt.managedbuild.tool.gnu.cross.cpp.compiler">
+								<option id="gnu.cpp.compiler.option.optimization.level.1671402547" name="Optimization Level" superClass="gnu.cpp.compiler.option.optimization.level" useByScannerDiscovery="false" value="gnu.cpp.compiler.optimization.level.none" valueType="enumerated"/>
+								<option id="gnu.cpp.compiler.option.debugging.level.1127804250" name="Debug Level" superClass="gnu.cpp.compiler.option.debugging.level" useByScannerDiscovery="false" value="gnu.cpp.compiler.debugging.level.max" valueType="enumerated"/>
+							</tool>
+							<tool command="${CC}" id="cdt.managedbuild.tool.gnu.cross.c.linker.760587897" name="Cross GCC Linker" superClass="cdt.managedbuild.tool.gnu.cross.c.linker">
+								<option id="gnu.c.link.option.libs.866397045" superClass="gnu.c.link.option.libs" useByScannerDiscovery="false" valueType="libs">
+									<listOptionValue builtIn="false" value="soc"/>
+								</option>
+								<inputType id="cdt.managedbuild.tool.gnu.c.linker.input.706772069" superClass="cdt.managedbuild.tool.gnu.c.linker.input">
+									<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
+									<additionalInput kind="additionalinput" paths="$(LIBS)"/>
+								</inputType>
+							</tool>
+							<tool id="cdt.managedbuild.tool.gnu.cross.cpp.linker.1290357125" name="Cross G++ Linker" superClass="cdt.managedbuild.tool.gnu.cross.cpp.linker"/>
+							<tool id="cdt.managedbuild.tool.gnu.cross.archiver.219000133" name="Cross GCC Archiver" superClass="cdt.managedbuild.tool.gnu.cross.archiver"/>
+							<tool command="${AS}" id="cdt.managedbuild.tool.gnu.cross.assembler.755294849" name="Cross GCC Assembler" superClass="cdt.managedbuild.tool.gnu.cross.assembler">
+								<inputType id="cdt.managedbuild.tool.gnu.assembler.input.19622702" superClass="cdt.managedbuild.tool.gnu.assembler.input"/>
+							</tool>
+						</toolChain>
+					</folderInfo>
+				</configuration>
+			</storageModule>
+			<storageModule moduleId="org.eclipse.cdt.core.externalSettings"/>
+		</cconfiguration>
+	</storageModule>
+	<storageModule moduleId="cdtBuildSystem" version="4.0.0">
+		<project id="pwm.cdt.managedbuild.target.gnu.cross.exe.1936458768" name="Executable" projectType="cdt.managedbuild.target.gnu.cross.exe"/>
+	</storageModule>
+	<storageModule moduleId="scannerConfiguration">
+		<autodiscovery enabled="true" problemReportingEnabled="true" selectedProfileId=""/>
+		<scannerConfigBuildInfo instanceId="cdt.managedbuild.config.gnu.cross.exe.debug.2021969369;cdt.managedbuild.config.gnu.cross.exe.debug.2021969369.;cdt.managedbuild.tool.gnu.cross.c.compiler.1368914442;cdt.managedbuild.tool.gnu.c.compiler.input.1557145701">
+			<autodiscovery enabled="true" problemReportingEnabled="true" selectedProfileId=""/>
+		</scannerConfigBuildInfo>
+	</storageModule>
+	<storageModule moduleId="org.eclipse.cdt.core.LanguageSettingsProviders"/>
+	<storageModule moduleId="org.eclipse.cdt.make.core.buildtargets"/>
+	<storageModule moduleId="refreshScope"/>
+</cproject>
diff --git a/pwm/.gitignore b/pwm/.gitignore
new file mode 100644
index 0000000..3df573f
--- /dev/null
+++ b/pwm/.gitignore
@@ -0,0 +1 @@
+/Debug/
diff --git a/pwm/.project b/pwm/.project
new file mode 100644
index 0000000..18e32a9
--- /dev/null
+++ b/pwm/.project
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>pwm</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
+			<triggers>clean,full,incremental,</triggers>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder</name>
+			<triggers>full,incremental,</triggers>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.cdt.core.cnature</nature>
+		<nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
+		<nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature>
+	</natures>
+</projectDescription>
diff --git a/pwm/.settings/language.settings.xml b/pwm/.settings/language.settings.xml
new file mode 100644
index 0000000..00e750b
--- /dev/null
+++ b/pwm/.settings/language.settings.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<project>
+	<configuration id="cdt.managedbuild.config.gnu.cross.exe.debug.2021969369" name="Debug">
+		<extension point="org.eclipse.cdt.core.LanguageSettingsProvider">
+			<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
+			<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
+			<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
+			<provider class="org.eclipse.cdt.internal.build.crossgcc.CrossGCCBuiltinSpecsDetector" console="false" env-hash="666590290315624892" id="org.eclipse.cdt.build.crossgcc.CrossGCCBuiltinSpecsDetector" keep-relative-paths="false" name="CDT Cross GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
+				<language-scope id="org.eclipse.cdt.core.gcc"/>
+				<language-scope id="org.eclipse.cdt.core.g++"/>
+			</provider>
+		</extension>
+	</configuration>
+</project>
diff --git a/pwm/pwm.c b/pwm/pwm.c
new file mode 100644
index 0000000..2743935
--- /dev/null
+++ b/pwm/pwm.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <libsoc_pwm.h>
+
+/*
+ * libsoc PWM API Documentation: https://jackmitch.github.io/libsoc/c/pwm/
+ */
+
+int main(void)
+{
+	pwm* vf_pwm = NULL;
+	uint32_t ret = EXIT_SUCCESS;
+	uint32_t pwm_period = 0;
+	uint32_t pwm_duty_cycle = 0;
+
+	vf_pwm = libsoc_pwm_request(0, 0, LS_WEAK);
+	if (vf_pwm == NULL) {
+		perror("PWM request failed");
+		return EXIT_FAILURE;
+	}
+
+	printf("Enter PWM Period:\t");
+	scanf("%d", &pwm_period);
+	ret = libsoc_pwm_set_period(vf_pwm, pwm_period);
+	if (ret == EXIT_FAILURE) {
+		perror("PWM set period failed");
+		goto exit_failure;
+	}
+
+	printf("Enter PWM Duty Cycle:\t");
+	scanf("%d", &pwm_duty_cycle);
+	ret = libsoc_pwm_set_duty_cycle(vf_pwm, pwm_duty_cycle);
+	if (ret == EXIT_FAILURE) {
+		perror("PWM set duty cycle failed");
+		goto exit_failure;
+	}
+
+	ret = libsoc_pwm_set_enabled(vf_pwm, ENABLED);
+	if (ret == EXIT_FAILURE) {
+		perror("PWM enable failed");
+		goto exit_failure;
+	}
+
+	printf("PWM will be running for 10 seconds\n");
+	sleep(10);
+
+	printf("Disabling PWM\n");
+	ret = libsoc_pwm_set_enabled(vf_pwm, DISABLED);
+	if (ret == EXIT_FAILURE)
+		perror("PWM disable failed");
+
+exit_failure:
+	libsoc_pwm_free(vf_pwm);
+
+	return ret;
+}