Merge pull request adafruit#868 from pewpew-game/gamepad-longlive

Make the gamepad singleton long-living and add it to root pointers

Author: tannewt

ports/atmel-samd/mpconfigport.h

@@ -312,6 +312,7 @@ extern const struct _mp_obj_module_t usb_hid_module;
     mp_obj_t playing_audio[AUDIO_DMA_CHANNEL_COUNT]; \
     mp_obj_t rtc_time_source; \
     FLASH_ROOT_POINTERS \
+    mp_obj_t gamepad_singleton; \
 
 void run_background_tasks(void);
 #define MICROPY_VM_HOOK_LOOP run_background_tasks();

ports/nrf/mpconfigport.h

@@ -323,6 +323,7 @@ extern const struct _mp_obj_module_t ble_module;
     struct _music_data_t *music_data; \
     const struct _pwm_events *pwm_active_events; \
     const struct _pwm_events *pwm_pending_events; \
+    mp_obj_t gamepad_singleton; \
 
 #define MP_PLAT_PRINT_STRN(str, len) mp_hal_stdout_tx_strn_cooked(str, len)
 

shared-bindings/gamepad/GamePad.c

@@ -26,14 +26,15 @@
 #include "py/obj.h"
 #include "py/runtime.h"
 #include "py/mphal.h"
+#include "py/gc.h"
+#include "py/mpstate.h"
+#include "shared-module/gamepad/__init__.h"
 #include "shared-module/gamepad/GamePad.h"
 #include "shared-bindings/digitalio/DigitalInOut.h"
 #include "shared-bindings/util.h"
 #include "GamePad.h"
 
 
-gamepad_obj_t* gamepad_singleton = NULL;
-
 //| .. currentmodule:: gamepad
 //|
 //| :class:`GamePad` -- Scan buttons for presses
@@ -105,12 +106,13 @@ STATIC mp_obj_t gamepad_make_new(const mp_obj_type_t *type, size_t n_args,
         raise_error_if_deinited(
             common_hal_digitalio_digitalinout_deinited(pin));
     }
-    if (!gamepad_singleton) {
-        gamepad_singleton = m_new_obj(gamepad_obj_t);
+    if (!MP_STATE_VM(gamepad_singleton)) {
+        gamepad_obj_t* gamepad_singleton = m_new_obj(gamepad_obj_t);
         gamepad_singleton->base.type = &gamepad_type;
+        MP_STATE_VM(gamepad_singleton) = gc_make_long_lived(gamepad_singleton);
     }
     gamepad_init(n_args, args);
-    return MP_OBJ_FROM_PTR(gamepad_singleton);
+    return MP_OBJ_FROM_PTR(MP_STATE_VM(gamepad_singleton));
 }
 
 
@@ -125,6 +127,7 @@ STATIC mp_obj_t gamepad_make_new(const mp_obj_type_t *type, size_t n_args,
 //|         held down) can be recorded for the next call.
 //|
 STATIC mp_obj_t gamepad_get_pressed(mp_obj_t self_in) {
+    gamepad_obj_t* gamepad_singleton = MP_STATE_VM(gamepad_singleton);
     mp_obj_t gamepad = MP_OBJ_NEW_SMALL_INT(gamepad_singleton->pressed);
     gamepad_singleton->pressed = 0;
     return gamepad;
@@ -137,14 +140,12 @@ MP_DEFINE_CONST_FUN_OBJ_1(gamepad_get_pressed_obj, gamepad_get_pressed);
 //|         Disable button scanning.
 //|
 STATIC mp_obj_t gamepad_deinit(mp_obj_t self_in) {
-    gamepad_singleton = NULL;
+    gamepad_reset();
     return mp_const_none;
 }
 MP_DEFINE_CONST_FUN_OBJ_1(gamepad_deinit_obj, gamepad_deinit);
 
 
-STATIC mp_obj_t gamepad_make_new(const mp_obj_type_t *type, size_t n_args,
-        size_t n_kw, const mp_obj_t *args);
 STATIC const mp_rom_map_elem_t gamepad_locals_dict_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR_get_pressed),  MP_ROM_PTR(&gamepad_get_pressed_obj)},
     { MP_OBJ_NEW_QSTR(MP_QSTR_deinit),  MP_ROM_PTR(&gamepad_deinit_obj)},

shared-module/gamepad/GamePad.c

@@ -26,6 +26,7 @@
 
 #include <stdbool.h>
 
+#include "py/mpstate.h"
 #include "__init__.h"
 #include "GamePad.h"
 
@@ -35,6 +36,7 @@
 
 
 void gamepad_init(size_t n_pins, const mp_obj_t* pins) {
+    gamepad_obj_t* gamepad_singleton = MP_STATE_VM(gamepad_singleton);
     for (size_t i = 0; i < 8; ++i) {
         gamepad_singleton->pins[i] = NULL;
     }

shared-module/gamepad/GamePad.h

@@ -39,8 +39,6 @@ typedef struct {
     uint8_t pulls;
 } gamepad_obj_t;
 
-extern gamepad_obj_t* gamepad_singleton;
-
 void gamepad_init(size_t n_pins, const mp_obj_t* pins);
 
 #endif  // MICROPY_INCLUDED_GAMEPAD_GAMEPAD_H

shared-module/gamepad/__init__.c

@@ -26,13 +26,15 @@
 
 #include <stdbool.h>
 
+#include "py/mpstate.h"
 #include "__init__.h"
 #include "GamePad.h"
 
 #include "shared-bindings/digitalio/DigitalInOut.h"
 
 
 void gamepad_tick(void) {
+    gamepad_obj_t* gamepad_singleton = MP_STATE_VM(gamepad_singleton);
     if (!gamepad_singleton) {
         return;
     }
@@ -54,5 +56,5 @@ void gamepad_tick(void) {
 }
 
 void gamepad_reset(void) {
-    gamepad_singleton = NULL;
+    MP_STATE_VM(gamepad_singleton) = NULL;
 }