Initial PWM gem.

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

mrbgems/machine-pwm/mrbgem.rake

@@ -0,0 +1,5 @@
+MRuby::Gem::Specification.new('machine-pwm') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'imi415'
+  spec.summary = 'PWM (Pulse Width Modulation) resource access'
+end

mrbgems/machine-pwm/src/pwm.c

@@ -0,0 +1,51 @@
+#include <mruby.h>
+#include <mruby/class.h>
+#include <mruby/data.h>
+#include <mruby/hash.h>
+#include <stdbool.h>
+
+/* Private */
+#include "pwm.h"
+
+typedef struct {
+    uint32_t channel;
+} mrb_pwm_t;
+
+static void mrb_pwm_free(mrb_state *mrb, void *ptr);
+
+const struct mrb_data_type mrb_pwm_type = {
+    .struct_name = "PWM",
+    .dfree       = mrb_pwm_free,
+};
+
+static void mrb_pwm_free(mrb_state *mrb, void *ptr) {
+    mrb_free(mrb, ptr);
+}
+
+static mrb_value mrb_pwm_initialize(mrb_state *mrb, mrb_value self) {
+    /* TODO: Implement this */
+    return self;
+}
+
+void mrb_machine_pwm_gem_init(mrb_state *mrb) {
+    /**
+     * Example:
+     *     pwm_pin led = Machine::PWM.new(0, {frequency: 1000, duty: 32768, enable: false})
+     *     led.enable
+     *     led.freq(5000)
+     *     led.duty(10)
+     */
+
+    struct RClass *module_machine = mrb_define_module(mrb, "Machine");
+    struct RClass *class_pwm      = mrb_define_class_under(mrb, module_machine, "PWM", mrb->object_class);
+
+    MRB_SET_INSTANCE_TT(class_pwm, MRB_TT_CDATA);
+
+    mrb_define_method(mrb, class_pwm, "initialize", mrb_pwm_initialize, MRB_ARGS_ARG(1, 1));
+
+    /* TODO: Implement methods */
+}
+
+void mrb_machine_gpio_gem_final(mrb_state *mrb) {
+    /* Unused */
+}

mrbgems/machine-pwm/src/pwm.h

@@ -0,0 +1,12 @@
+#ifndef MRBGEMS_MACHINE_PWM_PWM_H
+#define MRBGEMS_MACHINE_PWM_PWM_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+int mrb_machine_pwm_impl_config(uint32_t pin);
+int mrb_machine_pwm_impl_output_set(uint32_t pin, bool enable);
+int mrb_machine_pwm_impl_freq_set(uint32_t pin, uint32_t freq);
+int mrb_machine_pwm_impl_duty_set(uint32_t pin, uint16_t duty);
+
+#endif  // MRBGEMS_MACHINE_PWM_PWM_H

mrbgems/machine.gembox

@@ -2,4 +2,5 @@ MRuby::GemBox.new do |conf|
     conf.gem :core => "../../mrbgems/machine-adc"
     conf.gem :core => "../../mrbgems/machine-devmem"
     conf.gem :core => "../../mrbgems/machine-gpio"
+    conf.gem :core => "../../mrbgems/machine-pwm"
 end