diff --git a/source/adc.cpp b/source/adc.cpp
index 6ddabb6..0c58e21 100644
--- a/source/adc.cpp
+++ b/source/adc.cpp
@@ -1,3 +1,14 @@
+/**
+ * @file adc.cpp
+ * @brief Wrapper for ChibiOS's ADCDriver.
+ *
+ * Copyright (C) 2020 Clyne Sullivan
+ *
+ * Distributed under the GNU GPL v3 or later. You should have received a copy of
+ * the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #include "adc.hpp"
 
 const GPTConfig ADCd::m_gpt_config = {
diff --git a/source/adc.hpp b/source/adc.hpp
index 6b1789d..456e697 100644
--- a/source/adc.hpp
+++ b/source/adc.hpp
@@ -1,3 +1,14 @@
+/**
+ * @file adc.hpp
+ * @brief Wrapper for ChibiOS's ADCDriver.
+ *
+ * Copyright (C) 2020 Clyne Sullivan
+ *
+ * Distributed under the GNU GPL v3 or later. You should have received a copy of
+ * the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #ifndef STMDSP_ADC_HPP_
 #define STMDSP_ADC_HPP_
 
diff --git a/source/dac.cpp b/source/dac.cpp
index c7c250d..8981fc3 100644
--- a/source/dac.cpp
+++ b/source/dac.cpp
@@ -1,3 +1,14 @@
+/**
+ * @file dac.cpp
+ * @brief Wrapper for ChibiOS's DACDriver.
+ *
+ * Copyright (C) 2020 Clyne Sullivan
+ *
+ * Distributed under the GNU GPL v3 or later. You should have received a copy of
+ * the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #include "dac.hpp"
 
 //static const DACConversionGroup dacGroupConfig = {
diff --git a/source/dac.hpp b/source/dac.hpp
index 687e8cf..dc6cc3a 100644
--- a/source/dac.hpp
+++ b/source/dac.hpp
@@ -1,3 +1,14 @@
+/**
+ * @file dac.hpp
+ * @brief Wrapper for ChibiOS's DACDriver.
+ *
+ * Copyright (C) 2020 Clyne Sullivan
+ *
+ * Distributed under the GNU GPL v3 or later. You should have received a copy of
+ * the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #ifndef STMDSP_DAC_HPP_
 #define STMDSP_DAC_HPP_
 
diff --git a/source/main.cpp b/source/main.cpp
index 16ca7a8..b8d2fa1 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -1,3 +1,14 @@
+/**
+ * @file main.cpp
+ * @brief Program entry point.
+ *
+ * Copyright (C) 2020 Clyne Sullivan
+ *
+ * Distributed under the GNU GPL v3 or later. You should have received a copy of
+ * the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #include "ch.h"
 #include "hal.h"
 
@@ -5,12 +16,15 @@
 #include "dac.hpp"
 #include "usbserial.hpp"
 
+#include <array>
+
 #if CACHE_LINE_SIZE > 0
 CC_ALIGN(CACHE_LINE_SIZE)
 #endif
-adcsample_t samples[CACHE_SIZE_ALIGN(adcsample_t, 10)];
+static std::array<adcsample_t, CACHE_SIZE_ALIGN(adcsample_t, 100)> adc_samples;
 
-int main(void) {
+int main()
+{
     halInit();
     chSysInit();
 
@@ -32,21 +46,22 @@ int main(void) {
 
 	while (true) {
         if (usbd.active()) {
-            if (char c; usbd.read(&c) > 0 && c == 's') {
-                adc.getSamples(samples, 10);
-                for (int i = 0; i < 10; i++) {
-                    uint8_t str[5] = {
-                        static_cast<uint8_t>(samples[i] / 1000 % 10 + '0'),
-                        static_cast<uint8_t>(samples[i] / 100 % 10 + '0'),
-                        static_cast<uint8_t>(samples[i] / 10 % 10 + '0'),
-                        static_cast<uint8_t>(samples[i] % 10 + '0'),
-                        ' '
-                    };
-                    usbd.write(str, 5);
+            // Expect to receive a byte command 'packet'.
+            if (char cmd; usbd.read(&cmd) > 0) {
+                switch (cmd) {
+                case 'r': // Read in analog signal
+                    adc.getSamples(&adc_samples[0], adc_samples.size());
+                    usbd.write(adc_samples.data(), adc_samples.size());
+                    break;
+                case 'i': // Identify ourself as an stmdsp device
+                    usbd.write("stmdsp", 6);
+                    break;
+                default:
+                    break;
                 }
-                usbd.write("\r\n", 2);
             }
         }
+
 		chThdSleepMilliseconds(250);
 	}
 }
diff --git a/source/usbserial.cpp b/source/usbserial.cpp
index cead28a..105e9bf 100644
--- a/source/usbserial.cpp
+++ b/source/usbserial.cpp
@@ -1,3 +1,14 @@
+/**
+ * @file usbserial.cpp
+ * @brief Wrapper for ChibiOS's SerialUSBDriver.
+ *
+ * Copyright (C) 2020 Clyne Sullivan
+ *
+ * Distributed under the GNU GPL v3 or later. You should have received a copy of
+ * the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #include "usbserial.hpp"
 
 #include "hal.h"
diff --git a/source/usbserial.hpp b/source/usbserial.hpp
index a65190b..377f73c 100644
--- a/source/usbserial.hpp
+++ b/source/usbserial.hpp
@@ -1,3 +1,14 @@
+/**
+ * @file usbserial.hpp
+ * @brief Wrapper for ChibiOS's SerialUSBDriver.
+ *
+ * Copyright (C) 2020 Clyne Sullivan
+ *
+ * Distributed under the GNU GPL v3 or later. You should have received a copy of
+ * the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #ifndef STMDSP_USBSERIAL_HPP_
 #define STMDSP_USBSERIAL_HPP_