WFI in rendering loop when sleeping

2 files changed, 4 insertions, 2 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bcb8b4c..a921604 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,7 +60,7 @@ target_link_libraries(pico-watch pico_stdlib)
 target_link_libraries(pico-watch
         Oled
         hardware_rtc
-#        hardware_clocks
+        hardware_sync # For use of __wfi()
         )
 
 pico_add_extra_outputs(pico-watch)
diff --git a/pico-watch.cpp b/pico-watch.cpp
index e36c211..e04be23 100644
--- a/pico-watch.cpp
+++ b/pico-watch.cpp
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include "pico/stdlib.h"
 #include "hardware/i2c.h"
+#include "hardware/sync.h"
 #include "hardware/rtc.h"
 #include "pico/util/datetime.h"
 
@@ -125,7 +126,8 @@ int main() {
             app_api.display_write_backbuffer();
             app_rendering = false;
         }
-        sleep_ms(app_api.performance_render_interval_get());
+        if (is_sleeping) __wfi();
+        else sleep_ms(app_api.performance_render_interval_get());
     }
     return 0;
 }