Added GPIO gem to machine gembox.

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

CMakeLists.txt

@@ -39,6 +39,7 @@ add_dependencies(${PROJECT_NAME} mruby_libs)
 target_include_directories(${PROJECT_NAME} INTERFACE
     "${CMAKE_CURRENT_BINARY_DIR}/mruby/${MRUBY_MCUX_TARGET}/include"
     "mruby/include"
+    "mrbgems"
 )
 
 target_link_directories(${PROJECT_NAME} INTERFACE

mrbgems/machine-devmem/src/devmem.c

@@ -72,7 +72,7 @@ static mrb_value mrb_write8(mrb_state *mrb, mrb_value self) {
     mrb_get_args(mrb, "ii", &addr, &value);
 
     uint32_t addr_int  = (uint32_t)addr;
-    uint8_t value_int = (uint8_t)value;
+    uint8_t  value_int = (uint8_t)value;
 
     *(volatile uint8_t *)(addr_int) = value_int;
 
@@ -80,15 +80,16 @@ static mrb_value mrb_write8(mrb_state *mrb, mrb_value self) {
 }
 
 void mrb_machine_devmem_gem_init(mrb_state *mrb) {
-    struct RClass *class_peekpoke = mrb_define_module(mrb, "Machine");
+    struct RClass *module_machine = mrb_define_module(mrb, "Machine");
+    struct RClass *class_devmem   = mrb_define_class_under(mrb, module_machine, "DevMem", mrb->object_class);
 
-    mrb_define_class_method(mrb, class_peekpoke, "read32", mrb_read32, MRB_ARGS_ARG(1, 0));
-    mrb_define_class_method(mrb, class_peekpoke, "read16", mrb_read16, MRB_ARGS_ARG(1, 0));
-    mrb_define_class_method(mrb, class_peekpoke, "read8", mrb_read8, MRB_ARGS_ARG(1, 0));
+    mrb_define_class_method(mrb, class_devmem, "read32", mrb_read32, MRB_ARGS_ARG(1, 0));
+    mrb_define_class_method(mrb, class_devmem, "read16", mrb_read16, MRB_ARGS_ARG(1, 0));
+    mrb_define_class_method(mrb, class_devmem, "read8", mrb_read8, MRB_ARGS_ARG(1, 0));
 
-    mrb_define_class_method(mrb, class_peekpoke, "write32", mrb_write32, MRB_ARGS_ARG(2, 0));
-    mrb_define_class_method(mrb, class_peekpoke, "write16", mrb_write16, MRB_ARGS_ARG(2, 0));
-    mrb_define_class_method(mrb, class_peekpoke, "write8", mrb_write8, MRB_ARGS_ARG(2, 0));
+    mrb_define_class_method(mrb, class_devmem, "write32", mrb_write32, MRB_ARGS_ARG(2, 0));
+    mrb_define_class_method(mrb, class_devmem, "write16", mrb_write16, MRB_ARGS_ARG(2, 0));
+    mrb_define_class_method(mrb, class_devmem, "write8", mrb_write8, MRB_ARGS_ARG(2, 0));
 }
 
 void mrb_machine_devmem_gem_final(mrb_state *mrb) {

mrbgems/machine-gpio/mrbgem.rake

@@ -0,0 +1,5 @@
+MRuby::Gem::Specification.new('machine-gpio') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'imi415'
+  spec.summary = 'GPIO pin resource access'
+end

mrbgems/machine-gpio/src/gpio.c

@@ -0,0 +1,45 @@
+#include <mruby.h>
+#include <stdbool.h>
+
+/* Private */
+#include "gpio.h"
+
+typedef struct {
+    uint32_t                    pin;
+    mrbgems_machine_gpio_mode_t mode;
+    bool                        value;
+} mrb_gpio_t;
+
+static mrb_value mrb_gpio_initialize(mrb_state *mrb, mrb_value self) {
+    mrb_gpio_t *pin = mrb_malloc(mrb, sizeof(mrb_gpio_t));
+
+    mrb_value init_cfg = mrb_get_arg1(mrb);
+    mrb_ensure_hash_type(mrb, init_cfg);
+
+    /* TODO: Allocate mrb_gpio_t and store configuration */
+
+    /* TODO: Initialize GPIO */
+    mrb_machine_impl_gpio_init(0, MRBGEMS_MACHINE_GPIO_MODE_INPUT);
+    return self;
+}
+
+void mrb_machine_gpio_gem_init(mrb_state *mrb) {
+    /**
+     * Example:
+     *     pin_led = Machine::GPIO.new({pin: 10, mode: Machine::GPIO::OUTPUT_OD})
+     *     pin_btn = Machine::GPIO.new({pin: 2}) # Default mode is Machine::GPIO::INPUT
+     *     pin_led.on # Set to logical high
+     *     pin_led.off # Set to logical low
+     *     pin_led.toggle # Toggle.
+     */
+
+
+    struct RClass *module_machine = mrb_define_module(mrb, "Machine");
+    struct RClass *class_gpio     = mrb_define_class_under(mrb, module_machine, "GPIO", mrb->object_class);
+
+    mrb_define_method(mrb, class_gpio, "initialize", mrb_gpio_initialize, MRB_ARGS_ARG(1, 0));
+}
+
+void mrb_machine_gpio_gem_final(mrb_state *mrb) {
+    /* Unused */
+}

mrbgems/machine-gpio/src/gpio.h

@@ -0,0 +1,15 @@
+#ifndef MRBGEMS_MACHINE_GPIO_GPIO_H
+#define MRBGEMS_MACHINE_GPIO_GPIO_H
+
+#include <stdint.h>
+
+typedef enum {
+    MRBGEMS_MACHINE_GPIO_MODE_DISABLED,
+    MRBGEMS_MACHINE_GPIO_MODE_INPUT,
+    MRBGEMS_MACHINE_GPIO_MODE_OUTPUT_PUSHPULL,
+    MRBGEMS_MACHINE_GPIO_MODE_OUTPUT_OPENDRAIN,
+} mrbgems_machine_gpio_mode_t;
+
+int mrb_machine_impl_gpio_init(uint32_t pin, mrbgems_machine_gpio_mode_t mode);
+
+#endif  // MRBGEMS_MACHINE_GPIO_GPIO_H

mrbgems/utilities.gembox

@@ -1,3 +1,4 @@
 MRuby::GemBox.new do |conf|
     conf.gem :core => "../../mrbgems/machine-devmem"
+    conf.gem :core => "../../mrbgems/machine-gpio"
 end