From 09f67190a934230853e1dddaf65a14c4e9a50999 Mon Sep 17 00:00:00 2001
From: ConfuSomu
Date: Mon, 1 Mar 2021 22:31:20 -0500
Subject: Implement API to set/get render interval

---
 api.cpp        | 10 ++++++++++
 api.hpp        |  8 ++++++++
 pico-watch.cpp |  2 +-
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/api.cpp b/api.cpp
index 1200f16..2d63506 100644
--- a/api.cpp
+++ b/api.cpp
@@ -134,6 +134,16 @@ bool Api::datetime_get(datetime_t *t) {
     return rtc_get_datetime(t);
 }
 
+int Api::performance_render_interval_get() {
+    return m_app_render_interval;
+}
+
+void Api::performance_render_interval_set(int interval) {
+    if (interval < 10)
+        interval = 10;
+    m_app_render_interval = interval;
+}
+
 uint Api::button_last_get() {
     return m_button_last_pressed;
 }
diff --git a/api.hpp b/api.hpp
index f5de57e..20f5c34 100644
--- a/api.hpp
+++ b/api.hpp
@@ -13,6 +13,7 @@ class Api {
         u_char m_init_done = 0;
         uint8_t m_ucBuffer[1024] = {0};
         uint m_button_last_pressed = 0;
+        int m_app_render_interval = 500;
         void init_display();
     public:
         bool m_send_button_press_to_app = true;
@@ -55,7 +56,14 @@ class Api {
         // \param perf See Api::perf_modes enum for possible values
         bool performance_set(int perf);
         bool datetime_get(datetime_t *t);
+        // Get app's current render interval
+        // \return Value in millisec
+        int performance_render_interval_get();
+        // Same spirit as performance_set, the app should use the smallest value possible that does not cause a lack of responsiveness in the app's UI.
+        // \param interval Time to wait in millisec between calls of the app's render function.
+        void performance_render_interval_set(int interval);
         // Get last button pressed, see buttons.hpp for values
+        // \return Last button pressed
         uint button_last_get();
         // Set last button pressed, should only be called by button gpio interrupt.
         void button_last_set(uint gpio);
diff --git a/pico-watch.cpp b/pico-watch.cpp
index 7c59d98..adfe2fd 100644
--- a/pico-watch.cpp
+++ b/pico-watch.cpp
@@ -80,7 +80,7 @@ int main() {
 
     while (1) {
         app_render(current_app);
-        sleep_ms(500);
+        sleep_ms(app_api.performance_render_interval_get());
     }
     return 0;
 }
-- 
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