From e285ba9972fc2e0c74457b01db28dba9cb88c4e2 Mon Sep 17 00:00:00 2001
From: JF <jf@codingfield.com>
Date: Sun, 1 Mar 2020 15:57:58 +0100
Subject: Fix double-buffering for spi display (it's actually using
 double-buffering, now)

---
 src/DisplayApp/DisplayApp.cpp | 3 +++
 src/DisplayApp/LittleVgl.cpp  | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/src/DisplayApp/DisplayApp.cpp b/src/DisplayApp/DisplayApp.cpp
index 2519f40e..316312ed 100644
--- a/src/DisplayApp/DisplayApp.cpp
+++ b/src/DisplayApp/DisplayApp.cpp
@@ -45,6 +45,9 @@ void DisplayApp::Process(void *instance) {
   NRF_LOG_INFO("DisplayApp task started!");
   app->InitHw();
 
+  // Send a dummy notification to unlock the lvgl display driver for the first iteration
+  xTaskNotifyGive(xTaskGetCurrentTaskHandle());
+
   while (1) {
 
     app->Refresh();
diff --git a/src/DisplayApp/LittleVgl.cpp b/src/DisplayApp/LittleVgl.cpp
index 50744acc..95794546 100644
--- a/src/DisplayApp/LittleVgl.cpp
+++ b/src/DisplayApp/LittleVgl.cpp
@@ -62,6 +62,8 @@ void LittleVgl::InitTouchpad() {
 }
 
 void LittleVgl::FlushDisplay(const lv_area_t *area, lv_color_t *color_p) {
+  ulTaskNotifyTake(pdTRUE, 500);
+
   auto x = area->x1;
   auto y = area->y1;
   auto width = (area->x2-area->x1)+1;
-- 
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