systemcmds: convert c -> c++

src/systemcmds/tests/CMakeLists.txt

@@ -55,8 +55,8 @@ set(srcs
 	test_parameters.cpp
 	test_perf.c
 	test_ppm.cpp
-	test_ppm_loopback.c
-	test_rc.c
+	test_ppm_loopback.cpp
+	test_rc.cpp
 	test_search_min.cpp
 	test_sleep.c
 	test_uart_baudchange.c

src/systemcmds/tests/test_mount.cpp

@@ -80,7 +80,7 @@ int test_mount(int argc, char *argv[])
 
 	if (d) {
 
-		while ((dir = readdir(d)) != NULL) {
+		while ((dir = readdir(d)) != nullptr) {
 			//printf("%s\n", dir->d_name);
 		}
 

src/systemcmds/tests/test_ppm_loopback.cpp

@@ -32,7 +32,7 @@
  ****************************************************************************/
 
 /**
- * @file test_ppm_loopback.c
+ * @file test_ppm_loopback.cpp
  * Tests the PWM outputs and PPM input
  */
 
@@ -120,7 +120,7 @@ int test_ppm_loopback(int argc, char *argv[])
 
 	warnx("servo count: %d", servo_count);
 
-	struct pwm_output_values pwm_out = {.values = {0}, .channel_count = 0};
+	pwm_output_values pwm_out{};
 
 	for (unsigned i = 0; (i < servo_count) && (i < sizeof(pwm_values) / sizeof(pwm_values[0])); i++) {
 		pwm_out.values[i] = pwm_values[i];

src/systemcmds/tests/test_rc.cpp

@@ -32,7 +32,7 @@
  ****************************************************************************/
 
 /**
- * @file test_rc.c
+ * @file test_rc.cpp
  * Tests RC input.
  */