motor driver implementations

Chapter05/src/lib.rs

@@ -1,4 +1,7 @@
 extern crate libc;
+#[macro_use] extern crate serde_derive;
+extern crate serde;
+extern crate serde_json;
 
 pub mod motor_controllers;
 pub mod elevator_drivers;

Chapter05/src/motor1.c

@@ -1,5 +1,5 @@
 
-int motor1_adjust_motor(int target_force){
+int motor1_adjust_motor(double target_force){
   //real driver would do something here
   //interface with physical components
   return 0;

Chapter05/src/motor2.c

@@ -1,5 +1,5 @@
 
-int motor2_adjust_motor(int target_force){
+int motor2_adjust_motor(double target_force){
   //real driver would do something here
   //interface with physical components
   return 0;

Chapter05/src/motor3.c

@@ -1,5 +1,5 @@
 
-int motor3_adjust_motor(int target_force){
+int motor3_adjust_motor(double target_force){
   //real driver would do something here
   //interface with physical components
   return 0;

Chapter05/src/motor_controllers.rs

@@ -1,16 +1,68 @@
-use libc::c_int;
+use libc::c_double;
 
 #[link(name = "motor1")]
 extern {
-   pub fn motor1_adjust_motor(target_force: c_int) -> c_int;
+   pub fn motor1_adjust_motor(target_force: c_double) -> c_double;
 }
 
 #[link(name = "motor2")]
 extern {
-   pub fn motor2_adjust_motor(target_force: c_int) -> c_int;
+   pub fn motor2_adjust_motor(target_force: c_double) -> c_double;
 }
 
 #[link(name = "motor3")]
 extern {
-   pub fn motor3_adjust_motor(target_force: c_int) -> c_int;
+   pub fn motor3_adjust_motor(target_force: c_double) -> c_double;
+}
+
+#[derive(Clone,Serialize,Deserialize,Debug)]
+pub enum MotorInput
+{
+   Motor1 { target_force: f64 },
+   Motor2 { target_force: f64 },
+   Motor3 { target_force: f64 },
+}
+
+pub trait MotorDriver
+{
+   fn adjust_motor(input: MotorInput);
+}
+
+struct Motor1;
+impl MotorDriver for Motor1
+{
+   fn adjust_motor(input: MotorInput)
+   {
+      if let MotorInput::Motor1 { target_force: target_force } = input {
+         unsafe {
+            motor1_adjust_motor(target_force);
+         }
+      }
+   }
+}
+
+struct Motor2;
+impl MotorDriver for Motor2
+{
+   fn adjust_motor(input: MotorInput)
+   {
+      if let MotorInput::Motor1 { target_force: target_force } = input {
+         unsafe {
+            motor2_adjust_motor(target_force);
+         }
+      }
+   }
+}
+
+struct Motor3;
+impl MotorDriver for Motor3
+{
+   fn adjust_motor(input: MotorInput)
+   {
+      if let MotorInput::Motor1 { target_force: target_force } = input {
+         unsafe {
+            motor3_adjust_motor(target_force);
+         }
+      }
+   }
 }

Chapter05/src/simulate_trip.rs

@@ -4,12 +4,12 @@ use elevator::motor_controllers::{motor1_adjust_motor,motor2_adjust_motor,motor3
 fn main(){
    unsafe {
       println!("motor1 adjust");
-      motor1_adjust_motor(0);
+      motor1_adjust_motor(0.0);
 
       println!("motor2 adjust");
-      motor2_adjust_motor(0);
+      motor2_adjust_motor(0.0);
 
       println!("motor3 adjust");
-      motor3_adjust_motor(0);
+      motor3_adjust_motor(0.0);
    }
 }