#include "arduino_adc.h"

void c_adc_new(mrb_vm *vm, mrb_value *v, int argc){
  v[0] = mrbc_instance_new(vm, v[0].cls, sizeof(ADC_HANDLE));
  ADC_HANDLE *handle = (ADC_HANDLE *)v[0].instance->data;
  if(argc>0){
    handle->pin_num = GET_INT_ARG(1);
    pinMode( handle->pin_num, INPUT ); // adc num may differ from pin num
  }
}

void c_adc_read_raw(mrb_vm *vm, mrb_value *v, int argc){
  ADC_HANDLE *handle = (ADC_HANDLE *)v[0].instance->data;
  SET_INT_RETURN( analogRead( handle->pin_num ) );
}

void c_adc_read_voltage(mrb_vm *vm, mrb_value *v, int argc){
  ADC_HANDLE *handle = (ADC_HANDLE *)v[0].instance->data;
  float adc_p = ADC_REF * analogRead( handle->pin_num ) / ADC_RANGE;
  SET_FLOAT_RETURN(adc_p);
}

void mrbc_init_class_adc(void){
  mrb_class *adc = mrbc_define_class(0, "ADC",  mrbc_class_object);
  mrbc_define_method(0, adc, "new", c_adc_new);
  mrbc_define_method(0, adc, "read_raw", c_adc_read_raw);
  mrbc_define_method(0, adc, "read_voltage", c_adc_read_voltage);
  mrbc_define_method(0, adc, "read", c_adc_read_voltage);
}