4 files changed, 16 insertions, 0 deletions
diff --git a/api.cpp b/api.cpp
index 7279f19..1200f16 100644
--- a/api.cpp
+++ b/api.cpp
@@ -126,6 +126,10 @@ bool Api::gui_header_text(std::string text, int offset_x, int offset_row, int in
     oledWriteString(&m_oled, 0,offset_x,0+offset_row, &text[0], font, invert, 1);
 }
 
+bool Api::performance_set(int perf) {
+    return false;
+}
+
 bool Api::datetime_get(datetime_t *t) {
     return rtc_get_datetime(t);
 }
diff --git a/api.hpp b/api.hpp
index 7e2a3e9..f5de57e 100644
--- a/api.hpp
+++ b/api.hpp
@@ -16,6 +16,11 @@ class Api {
         void init_display();
     public:
         bool m_send_button_press_to_app = true;
+        enum perf_modes {
+            LOW_POWER,
+            NORMAL_PERF,
+            HIGH_PERF
+        };
         void init();
         int display_write_string(int iScrollX, int x, int y, char *szMsg, int iSize, int bInvert, int bRender);
         void display_fill(unsigned char ucData, int bRender);
@@ -44,6 +49,11 @@ class Api {
         // \param offset_row Render text lines lower. For example, one text line lower with `offset_row = 1`.
         // \param invert Invert text and background color.
         bool gui_header_text(std::string text, int offset_x = 0, int offset_row = 0, int invert = 0);
+        // Set performance mode.
+        // FIXME: function currently does nothing!
+        // An app should choose the lowest performance that can make it function. Set in init(). Only when required, higher performance should be used.
+        // \param perf See Api::perf_modes enum for possible values
+        bool performance_set(int perf);
         bool datetime_get(datetime_t *t);
         // Get last button pressed, see buttons.hpp for values
         uint button_last_get();
diff --git a/apps/home_menu.cpp b/apps/home_menu.cpp
index 658d911..910ebac 100644
--- a/apps/home_menu.cpp
+++ b/apps/home_menu.cpp
@@ -76,6 +76,7 @@ namespace app_home_menu {
 
     // Initlisation of the app.
     int init(Api *app_api) {
+        app_api->performance_set(Api::perf_modes::LOW_POWER);
         pressed_button = new char; *pressed_button = '*';
         selected_app = new int; *selected_app = 0; // Make sure to init the values to something known!
         return 0; // return 1 when function not implemented
diff --git a/apps/main_clock.cpp b/apps/main_clock.cpp
index 21c9e5d..895a7b9 100644
--- a/apps/main_clock.cpp
+++ b/apps/main_clock.cpp
@@ -64,6 +64,7 @@ namespace app_main_clock {
 
     // Initlisation of the app.
     int init(Api *app_api) {
+        app_api->performance_set(Api::perf_modes::LOW_POWER);
         return 1; // return 1 when function not implemented
     }