1 // Copyright 2013 Emilie Gillet.
2 //
3 // Author: Emilie Gillet (emilie.o.gillet@gmail.com)
4 //
5 // Permission is hereby granted, free of charge, to any person obtaining a copy
6 // of this software and associated documentation files (the "Software"), to deal
7 // in the Software without restriction, including without limitation the rights
8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 // copies of the Software, and to permit persons to whom the Software is
10 // furnished to do so, subject to the following conditions:
11 //
12 // The above copyright notice and this permission notice shall be included in
13 // all copies or substantial portions of the Software.
14 //
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 // THE SOFTWARE.
22 //
23 // See http://creativecommons.org/licenses/MIT/ for more information.
24 //
25 // -----------------------------------------------------------------------------
26 //
27 // Driver for the end of cycles output pins.
28 
29 #ifndef TIDES_DRIVERS_GATE_INPUT_H_
30 #define TIDES_DRIVERS_GATE_INPUT_H_
31 
32 #include "stmlib/stmlib.h"
33 
34 #include <stm32f10x_conf.h>
35 
36 #include "tides/generator.h"
37 
38 namespace tides {
39 
40 class GateInput {
41  public:
GateInput()42   GateInput() { }
~GateInput()43   ~GateInput() { }
44 
45   void Init();
46 
Read()47   inline uint8_t Read() {
48     uint16_t value = GPIOB->IDR;
49 
50     uint8_t state = 0;
51     if (!(value & GPIO_Pin_1)) {
52       state |= CONTROL_FREEZE;
53     }
54     if (!(value & GPIO_Pin_11)) {
55       state |= CONTROL_GATE;
56     }
57     if (!(value & GPIO_Pin_10)) {
58       state |= CONTROL_CLOCK;
59     }
60     if (!(previous_state_ & CONTROL_CLOCK) && (state & CONTROL_CLOCK)) {
61       state |= CONTROL_CLOCK_RISING;
62     }
63     if (!(previous_state_ & CONTROL_GATE) && (state & CONTROL_GATE)) {
64       state |= CONTROL_GATE_RISING;
65     }
66     if ((previous_state_ & CONTROL_GATE) && !(state & CONTROL_GATE)) {
67       state |= CONTROL_GATE_FALLING;
68     }
69     previous_state_ = state;
70     return state;
71   }
72 
73  private:
74   uint8_t previous_state_;
75 
76   DISALLOW_COPY_AND_ASSIGN(GateInput);
77 };
78 
79 }  // namespace tides
80 
81 #endif  // TIDES_DRIVERS_GATE_INPUT_H_
82