Change select / start button to be turbos for B / A respectively

.gitignore

@@ -33,3 +33,4 @@ venv
 
 **/*.pyc
 
+*.sw[mnop]

Core/Src/gw_buttons.c

@@ -2,9 +2,19 @@
 
 #include "stm32h7xx_hal.h"
 #include "main.h"
+#include "odroid_system.h"
 
 #include <stdbool.h>
 
+#if ENABLE_TURBO_BUTTONS == 1
+#define TURBO_FREQUENCY_HZ 30
+
+bool is_turbo_high() {
+  int turbo_period_ms = 1000 / TURBO_FREQUENCY_HZ;
+  return (get_elapsed_time() % turbo_period_ms) < (turbo_period_ms / 2);
+}
+#endif
+
 uint32_t buttons_get() {
     bool left = HAL_GPIO_ReadPin(BTN_Left_GPIO_Port, BTN_Left_Pin) == GPIO_PIN_RESET;
     bool right = HAL_GPIO_ReadPin(BTN_Right_GPIO_Port, BTN_Right_Pin) == GPIO_PIN_RESET;
@@ -17,8 +27,13 @@ uint32_t buttons_get() {
     bool pause = HAL_GPIO_ReadPin(BTN_PAUSE_GPIO_Port, BTN_PAUSE_Pin) == GPIO_PIN_RESET;
     bool power = HAL_GPIO_ReadPin(BTN_PWR_GPIO_Port, BTN_PWR_Pin) == GPIO_PIN_RESET;
 
+#if ENABLE_TURBO_BUTTONS == 1
+    a |= HAL_GPIO_ReadPin(BTN_START_GPIO_Port, BTN_START_Pin) == GPIO_PIN_RESET && is_turbo_high();
+    b |= HAL_GPIO_ReadPin(BTN_SELECT_GPIO_Port, BTN_SELECT_Pin) == GPIO_PIN_RESET && is_turbo_high();
+#else
     game |= HAL_GPIO_ReadPin(BTN_START_GPIO_Port, BTN_START_Pin) == GPIO_PIN_RESET;
     time |= HAL_GPIO_ReadPin(BTN_SELECT_GPIO_Port, BTN_SELECT_Pin) == GPIO_PIN_RESET;
+#endif
 
     return (
         left | (up << 1) | (right << 2) | (down << 3) | (a << 4) | (b << 5) |

Makefile.common

@@ -67,6 +67,8 @@ else
 	ENABLE_SCREENSHOT ?= 1
 endif
 
+ENABLE_TURBO_BUTTONS ?= 0
+
 # Compress supported ROMs by default. Set to 0 to disable.
 COMPRESS ?= lzma
 ifeq ($(COMPRESS),0)
@@ -277,6 +279,7 @@ C_DEFS +=  \
 -DDEBUG_RG_ALLOC \
 -DSTATE_SAVING=$(STATE_SAVING) \
 -DENABLE_SCREENSHOT=$(ENABLE_SCREENSHOT) \
+-DENABLE_TURBO_BUTTONS=$(ENABLE_TURBO_BUTTONS) \
 -DGNW_TARGET_MARIO=$(GNW_TARGET_MARIO) \
 -DGNW_TARGET_ZELDA=$(GNW_TARGET_ZELDA)
 
@@ -645,6 +648,7 @@ help:
 	@echo "  RESET_DBGMCU        - Configures if DBGMCU should be reset after flashing."
 	@echo "                        Set to 0 to disable power saving (default=1)"
 	@echo "  ENABLE_SCREENSHOT   - Set to 1 to enable screenshot support (default disabled if extflash is 1MB)"
+	@echo "  ENABLE_TURBO_BUTTONS- Set to 1 to swap start/select buttons for turbo A and B buttons (Zelda only) (default=0)"
 	@echo "  GNW_TARGET          - Game & Watch target, Valid values {mario,zelda} (default=mario)"
 	@echo ""
 	@echo "Current configuration:"
@@ -658,6 +662,7 @@ help:
 	@echo "  STATE_SAVING=$(STATE_SAVING)"
 	@echo "  RESET_DBGMCU=$(RESET_DBGMCU)"
 	@echo "  ENABLE_SCREENSHOT=$(ENABLE_SCREENSHOT)"
+	@echo "  ENABLE_TURBO_BUTTONS=$(ENABLE_TURBO_BUTTONS)"
 	@echo "  GNW_TARGET=$(GNW_TARGET)"
 	@echo "  GCC_PATH=$(GCC_PATH)"
 	@echo "  PREFIX=$(PREFIX)"