Add gpio interrupt sample code
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82cc507e07
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5 changed files with 227 additions and 0 deletions
69
gpio_interrupt/.cproject
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69
gpio_interrupt/.cproject
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<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
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<additionalInput kind="additionalinput" paths="$(LIBS)"/>
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</inputType>
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<tool id="cdt.managedbuild.tool.gnu.cross.cpp.linker.1934610616" name="Cross G++ Linker" superClass="cdt.managedbuild.tool.gnu.cross.cpp.linker"/>
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<project id="gpio_interrupt.cdt.managedbuild.target.gnu.cross.exe.388746707" name="Executable" projectType="cdt.managedbuild.target.gnu.cross.exe"/>
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<storageModule moduleId="refreshScope" versionNumber="2">
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<configuration configurationName="Debug">
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<resource resourceType="PROJECT" workspacePath="/gpio_interrupt"/>
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</cproject>
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1
gpio_interrupt/.gitignore
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1
gpio_interrupt/.gitignore
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/Debug/
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26
gpio_interrupt/.project
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26
gpio_interrupt/.project
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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>gpio_interrupt</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
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<triggers>clean,full,incremental,</triggers>
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<arguments>
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<buildCommand>
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<name>org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder</name>
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<triggers>full,incremental,</triggers>
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<natures>
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<nature>org.eclipse.cdt.core.cnature</nature>
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<nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
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<nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature>
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</natures>
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</projectDescription>
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14
gpio_interrupt/.settings/language.settings.xml
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14
gpio_interrupt/.settings/language.settings.xml
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<project>
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<configuration id="cdt.managedbuild.config.gnu.cross.exe.debug.768150796" name="Debug">
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<extension point="org.eclipse.cdt.core.LanguageSettingsProvider">
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<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
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<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
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<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
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<provider class="org.eclipse.cdt.internal.build.crossgcc.CrossGCCBuiltinSpecsDetector" console="false" env-hash="643270697067650404" id="org.eclipse.cdt.build.crossgcc.CrossGCCBuiltinSpecsDetector" keep-relative-paths="false" name="CDT Cross GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD "${INPUTS}"" prefer-non-shared="true">
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<language-scope id="org.eclipse.cdt.core.gcc"/>
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<language-scope id="org.eclipse.cdt.core.g++"/>
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</provider>
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</extension>
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</configuration>
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</project>
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117
gpio_interrupt/gpio_interrupt.c
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117
gpio_interrupt/gpio_interrupt.c
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@ -0,0 +1,117 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include "libsoc_gpio.h"
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/*
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* libsoc GPIO documentation: http://jackmitch.github.io/libsoc/c/gpio/#gpio
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*/
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volatile bool interrupt_occurred = false;
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volatile bool led_status = false;
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int gpio_interrupt_callback(void* arg)
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{
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interrupt_occurred = true;
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return 0;
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}
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int main(void)
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{
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uint32_t gpio_input;
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uint32_t led_output;
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uint32_t ret = 0;
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gpio *gpio_interrupt = NULL;
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gpio *gpio_led = NULL;
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printf("Enter the GPIO number to use as interrupt:\t");
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scanf("%d", &gpio_input);
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printf("Enter the GPIO number used for LED output:\t");
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scanf("%d", &led_output);
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/*
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* It is expected that the gpio being requested is pin multiplexed correctly
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* in the kernel device tree or board file as applicable else gpio request
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* is bound to fail.
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*/
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gpio_interrupt = libsoc_gpio_request(gpio_input, LS_SHARED);
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if (gpio_interrupt == NULL) {
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perror("gpio request failed");
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goto exit;
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}
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gpio_led = libsoc_gpio_request(led_output, LS_SHARED);
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if (gpio_led == NULL) {
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perror("led gpio request failed");
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goto exit;
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}
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ret = libsoc_gpio_set_direction(gpio_led, OUTPUT);
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if (ret == EXIT_FAILURE) {
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perror("Failed to set gpio led direction");
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goto exit;
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}
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ret = libsoc_gpio_set_direction(gpio_interrupt, INPUT);
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if (ret == EXIT_FAILURE) {
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perror("Failed to set gpio direction");
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goto exit;
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}
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ret = libsoc_gpio_set_edge(gpio_interrupt, RISING);
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if (ret == EXIT_FAILURE) {
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perror("Failed to set gpio edge");
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goto exit;
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}
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ret = libsoc_gpio_callback_interrupt(gpio_interrupt, &gpio_interrupt_callback, NULL);
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if (ret == EXIT_FAILURE) {
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perror("Failed to set gpio callback");
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goto exit;
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}
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printf("Waiting for interrupt\n");
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while (true) {
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if (interrupt_occurred) {
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interrupt_occurred = false;
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if (!led_status) {
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led_status = true;
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libsoc_gpio_set_level(gpio_led, HIGH);
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} else {
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led_status = false;
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libsoc_gpio_set_level(gpio_led, LOW);
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}
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printf("Interrupt occurred\n");
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/* Uncomment this to exit on first interrupt */
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//goto exit;
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}
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usleep(200);
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}
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exit:
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if (gpio_interrupt) {
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ret = libsoc_gpio_free(gpio_interrupt);
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if (ret == EXIT_FAILURE)
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perror("Could not free gpio");
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}
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if (gpio_led) {
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ret = libsoc_gpio_free(gpio_led);
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if (ret == EXIT_FAILURE)
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perror("Could not free led gpio");
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}
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return ret;
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}
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