[examples] Add snippets for Digital Input article (#7949)

wpilibcExamples/src/main/cpp/snippets/AnalogTrigger/cpp/Robot.cpp

@@ -0,0 +1,40 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include <frc/AnalogInput.h>
+#include <frc/AnalogTrigger.h>
+#include <frc/TimedRobot.h>
+
+/**
+ * Analog Trigger snippets for frc-docs.
+ * https://docs.wpilib.org/en/stable/docs/software/hardware-apis/sensors/digital-input-software.html
+ */
+class Robot : public frc::TimedRobot {
+ public:
+  Robot() {
+    // Enables 2-bit oversampling
+    input.SetAverageBits(2);
+    // Sets the trigger to enable at a raw value of 3500, and disable at a value
+    // of 1000
+    trigger0.SetLimitsRaw(1000, 3500);
+    // Sets the trigger to enable at a voltage of 4 volts, and disable at a
+    // value of 1.5 volts
+    trigger0.SetLimitsVoltage(1.5, 4);
+  }
+
+ private:
+  // Initializes an AnalogTrigger on port 0
+  frc::AnalogTrigger trigger0{0};
+  // Initializes an AnalogInput on port 1
+  frc::AnalogInput input{1};
+
+  // Initializes an AnalogTrigger using the above input
+  frc::AnalogTrigger trigger1{input};
+};
+
+#ifndef RUNNING_FRC_TESTS
+int main() {
+  return frc::StartRobot<Robot>();
+}
+#endif

wpilibcExamples/src/main/cpp/snippets/DigitalInput/cpp/Robot.cpp

@@ -0,0 +1,29 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include <frc/DigitalInput.h>
+#include <frc/TimedRobot.h>
+
+/**
+ * Digital Input snippets for frc-docs.
+ * https://docs.wpilib.org/en/stable/docs/software/hardware-apis/sensors/digital-input-software.html
+ */
+class Robot : public frc::TimedRobot {
+ public:
+  void TeleopPeriodic() override {
+    // Gets the value of the digital input.  Returns true if the circuit is
+    // open.
+    m_input.Get();
+  }
+
+ private:
+  // Initializes a DigitalInput on DIO 0
+  frc::DigitalInput m_input{0};
+};
+
+#ifndef RUNNING_FRC_TESTS
+int main() {
+  return frc::StartRobot<Robot>();
+}
+#endif

wpilibcExamples/src/main/cpp/snippets/snippets.json

@@ -62,5 +62,26 @@
     ],
     "foldername": "LimitSwitch",
     "gradlebase": "cpp"
+  },
+  {
+    "name": "DigitalInput",
+    "description": "Snippets of Digital Input for frc-docs.",
+    "tags": [
+      "Hardware",
+      "Digital Input"
+    ],
+    "foldername": "DigitalInput",
+    "gradlebase": "cpp"
+  },
+  {
+    "name": "AnalogTrigger",
+    "description": "Snippets of Analog Trigger for frc-docs.",
+    "tags": [
+      "Hardware",
+      "Analog",
+      "Digital Input"
+    ],
+    "foldername": "AnalogTrigger",
+    "gradlebase": "cpp"
   }
 ]