From b207dc53e9db2ff09c291dae843bb39add867a9c Mon Sep 17 00:00:00 2001
From: prokrypt <prokrypt@edited.us>
Date: Sun, 13 Apr 2025 01:28:48 -0700
Subject: [PATCH] picocalc_keyboard.ino: use is_write to NOT turn off backlight
 during read.

fixes blacked out screen when backlight register is read.
---
 Code/picocalc_keyboard/picocalc_keyboard.ino | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Code/picocalc_keyboard/picocalc_keyboard.ino b/Code/picocalc_keyboard/picocalc_keyboard.ino
index cb2cb36..f153d25 100644
--- a/Code/picocalc_keyboard/picocalc_keyboard.ino
+++ b/Code/picocalc_keyboard/picocalc_keyboard.ino
@@ -130,8 +130,10 @@ void receiveEvent(int howMany) {
       write_buffer[1] = (uint8_t)item.key;
     } break;
     case REG_ID_BKL: {
-      reg_set_value(REG_ID_BKL, rcv_data[1]);
-      lcd_backlight_update_reg();
+      if (is_write) {
+        reg_set_value(REG_ID_BKL, rcv_data[1]);
+        lcd_backlight_update_reg();
+      }
       write_buffer[0] = reg;
       write_buffer[1] = reg_get_value(REG_ID_BKL);
     } break;