Adjust atmega measurement structure to the others

This adjusts the folder structure in the measurement examples
to include an atmega subfolder, just as we have an nRF and
ESP subfolder.
It also splits the GPIO implementations in the respective
microcontroller parts.
Furthermore, this implements the noop for the atmega HW crypto.

Author: sirkrypt0

examples/CMakeLists.txt

@@ -13,4 +13,4 @@ target_link_libraries(nfc_simulator ${PRODUCT_NAME})
 #######################################
 # Test applications
 
-add_subdirectory(measurements)
+add_subdirectory(measurements/atmega)

examples/measurements/CMakeLists.txt …mples/measurements/atmega/CMakeLists.txtexamples/measurements/CMakeLists.txt renamed to examples/measurements/atmega/CMakeLists.txt examples/measurements/CMakeLists.txt renamed to examples/measurements/atmega/CMakeLists.txt

@@ -1,8 +1,8 @@
-include(../../cmake/linker-map.cmake)
+include(../../../cmake/linker-map.cmake)
 
 function(add_measurement name)
-  add_executable(${name} "common/${name}.c" common/gpio.c)
-  target_include_directories(${name} PRIVATE common/)
+  add_executable(${name} "common/${name}.c" gpio.c hw_crypto.c)
+  target_include_directories(${name} PRIVATE common/ .)
   add_linker_map_for_target(${name})
   target_link_libraries(${name} ${PRODUCT_NAME})
 endfunction()

examples/measurements/atmega/common

@@ -0,0 +1 @@
+../common

examples/measurements/atmega/gpio.c

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2022 Felix Gohla, Konrad Hanff, Tobias Kantusch,
+ *                    Quentin Kuth, Felix Roth. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+#include <avr/io.h>
+#include <util/delay.h>
+
+#define PIN PB5
+
+void setup_pin() {
+    DDRB |= _BV(PIN);
+}
+
+void pin_on() {
+    PORTB |= _BV(PIN);
+}
+
+void pin_off() {
+    PORTB &= ~_BV(PIN);
+}
+
+void delay(double ms) {
+    for (double i = 0; i < ms; i++) {
+        _delay_ms(1);
+    }
+}

examples/measurements/atmega/hw_crypto.c

@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2022 Felix Gohla, Konrad Hanff, Tobias Kantusch,
+ *                    Quentin Kuth, Felix Roth. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+int init_hw_crypto() {
+    return 0;
+}

examples/measurements/atmega/hw_crypto.h

@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2022 Felix Gohla, Konrad Hanff, Tobias Kantusch,
+ *                    Quentin Kuth, Felix Roth. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+/**
+ * @brief Initialize cryptography module (if hardware cryptography is enabled).
+ * 
+ * @return int 0 on success.
+ */
+int init_hw_crypto();

examples/measurements/common/aes_gcm_measure.c

@@ -33,9 +33,7 @@ int main(void) {
 
     uint8_t plain[576] = {0};
 
-#ifdef CONFIG_USE_HW_CRYPTO
     init_hw_crypto();
-#endif
 
     setup_pin();
     pin_off();

examples/measurements/common/ed25519_measure.c

@@ -8,6 +8,7 @@
 
 #include "fido.h"
 #include "gpio.h"
+#include "hw_crypto.h"
 
 #include <stdio.h>
 #include <string.h>
@@ -31,9 +32,7 @@ int main(void) {
     // Wait until the microcontroller booted up to remove increased power consumption in the measurements at the beginning.
     delay(3000);
 
-#ifdef CONFIG_USE_HW_CRYPTO
     init_hw_crypto();
-#endif
 
     setup_pin();
     pin_off();

examples/measurements/common/gpio.h

@@ -6,6 +6,8 @@
  * license that can be found in the LICENSE file.
  */
 
+#pragma once
+
 /**
  * @brief Setup the logical PPK2 output pin.
  */

examples/measurements/common/sha256_measure.c

@@ -30,9 +30,7 @@ int main(void) {
 
     uint8_t hash[32] = {0};
 
-#ifdef CONFIG_USE_HW_CRYPTO
     init_hw_crypto();
-#endif
 
     setup_pin();
     pin_off();