Initial GPIO gem experiment.

Signed-off-by: Yilin Sun <imi415@imi.moe>

CMakeLists.txt

@@ -65,6 +65,7 @@ set(TARGET_SOURCES
     "src/app_aux_ctrl.c"
     "src/app_mrb_repl.c"
     "src/app_syscalls.c"
+    "src/mrb_machine_impl/mrb_machine_impl_gpio.c"
     "src/main.c"
 )
 

lib/mruby

@@ -1 +1 @@
-Subproject commit 002dfde385403b81973b588cf0af0ae0517bedaa
+Subproject commit 538ae1d21f7fd78b628d6b9f0b85b2b54eb28795

src/main.c

@@ -19,7 +19,7 @@
 #define APP_LOG_SUCCESSFUL_ALLOC false
 #endif
 
-static bool s_aux_available = false;
+static volatile bool s_aux_available = false;
 
 static void app_mrb_runtime_task(void *parameters);
 
@@ -50,6 +50,8 @@ dead_loop:
     }
 }
 
+/* TODO: Split runtime and REPL so that user can interrupt with Ctrl-C input. */
+
 static void app_mrb_runtime_task(void *parameters) {
     bool exit_repl;
 

src/mrb_machine_impl/mrb_machine_impl_gpio.c

@@ -0,0 +1,7 @@
+#include "board.h"
+#include "fsl_gpio.h"
+#include "machine-gpio/src/gpio.h"
+
+int mrb_machine_impl_gpio_init(uint32_t pin, mrbgems_machine_gpio_mode_t mode) {
+    return 0;
+}