From d0c550cadceff3fdf30060f4ac0ebf919e5934a1 Mon Sep 17 00:00:00 2001
From: hathach <thach@tinyusb.org>
Date: Tue, 21 Apr 2026 19:44:10 +0700
Subject: enable double buffer for tm4c

---
 hw/bsp/tm4c/family.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'hw')

diff --git a/hw/bsp/tm4c/family.c b/hw/bsp/tm4c/family.c
index 6988a264e..c5e4bd64e 100644
--- a/hw/bsp/tm4c/family.c
+++ b/hw/bsp/tm4c/family.c
@@ -58,6 +58,14 @@ static void board_button_init(GPIOA_Type* port, uint8_t PinMsk) {
 
   /* Set direction */
   port->DIR &= ~PinMsk;
+
+  /* Enable internal pull so the idle state is deterministic. LaunchPad buttons
+   * connect the pin to GND when pressed (active-low) and require a pull-up. */
+#if BUTTON_STATE_ACTIVE == 0
+  port->PUR |= PinMsk;
+#else
+  port->PDR |= PinMsk;
+#endif
 }
 
 static void board_led_init(GPIOA_Type* port, uint8_t PinMsk, uint8_t dirmsk) {
-- 
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