From c3cf7cee4eb8eba7f703a7d66f2289033f641f21 Mon Sep 17 00:00:00 2001
From: Colin <colin@uninsane.org>
Date: Sat, 5 Oct 2024 12:15:20 +0000
Subject: [PATCH] use OS sleep instead of polling to reduce CPU usage

without this lvgl never releases the CPU, and just pegs one of the cores
to 100%. see
<https://github.com/lvgl/lvgl/blob/master/docs/porting/timer_handler.rst>
---
 buffyboard/main.c | 3 ++-
 unl0kr/main.c     | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/buffyboard/main.c b/buffyboard/main.c
index 26054f3..ac7b66b 100644
--- a/buffyboard/main.c
+++ b/buffyboard/main.c
@@ -284,7 +284,8 @@ int main(int argc, char *argv[]) {
 
     /* Periodically run timer / task handler */
     while(1) {
-        lv_timer_periodic_handler();
+        uint32_t time_till_next = lv_timer_handler();
+        usleep(time_till_next);
     }
 
     return 0;
diff --git a/unl0kr/main.c b/unl0kr/main.c
index e711e44..53640cd 100644
--- a/unl0kr/main.c
+++ b/unl0kr/main.c
@@ -591,7 +591,8 @@ int main(int argc, char *argv[]) {
     uint32_t timeout = conf_opts.general.timeout * 1000; /* ms */
     while(1) {
         if (!timeout || lv_disp_get_inactive_time(NULL) < timeout) {
-            lv_timer_periodic_handler();
+            uint32_t time_till_next = lv_timer_handler();
+            usleep(time_till_next);
         } else if (timeout) {
             shutdown();
         }