From d7b833da615840ad5f2ae8c6a81eab974409dc15 Mon Sep 17 00:00:00 2001
From: Jorj Bauer <jorj@jorj.org>
Date: Tue, 18 Jan 2022 17:18:12 -0500
Subject: [PATCH] backlight working

---
 teensy/RA8875_t4.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/teensy/RA8875_t4.cpp b/teensy/RA8875_t4.cpp
index 648b377..b9a91da 100644
--- a/teensy/RA8875_t4.cpp
+++ b/teensy/RA8875_t4.cpp
@@ -163,8 +163,10 @@ void RA8875_t4::_initializeTFT()
   delay(1);
   fillWindow(); // defaults to black
 
-  _writeRegister(RA8875_GPIOX, true); // turn on backlight
-
+  // turn on backlight
+  _writeRegister(RA8875_P1CR, (RA8875_PxCR_ENABLE | (RA8875_PWM_CLK_DIV1024 & 0xF)));
+  _writeRegister(RA8875_P1DCR, 255); // brightness
+  
   // set graphics mode & default memory write order/behavior
   _writeRegister(RA8875_MWCR0, 0x00);