1 // Copyright 2014 Olivier Gillet.
2 //
3 // Author: Olivier Gillet (ol.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 3 LEDs.
28
29 #include "elements/drivers/leds.h"
30
31 #include <algorithm>
32
33 namespace elements {
34
35 using namespace std;
36
37 const uint32_t kPwmFrequency = 140624;
38 const uint16_t kPwmResolution = 8;
39
Init()40 void Leds::Init() {
41 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
42 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
43 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
44
45 GPIO_InitTypeDef gpio_init;
46 TIM_TimeBaseInitTypeDef timer_init;
47 TIM_OCInitTypeDef output_compare_init;
48
49 gpio_init.GPIO_Pin = GPIO_Pin_7;
50 gpio_init.GPIO_Mode = GPIO_Mode_OUT;
51 gpio_init.GPIO_OType = GPIO_OType_PP;
52 gpio_init.GPIO_Speed = GPIO_Speed_2MHz;
53 gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
54 GPIO_Init(GPIOC, &gpio_init);
55
56 gpio_init.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_11;
57 gpio_init.GPIO_Mode = GPIO_Mode_AF;
58 gpio_init.GPIO_OType = GPIO_OType_PP;
59 gpio_init.GPIO_Speed = GPIO_Speed_2MHz;
60 gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
61 GPIO_Init(GPIOA, &gpio_init);
62
63 GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1);
64 GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_TIM1);
65
66 TIM_TimeBaseStructInit(&timer_init);
67 timer_init.TIM_Period = (1 << kPwmResolution) - 1;
68 timer_init.TIM_Prescaler = 0; // Switch fast, die young.
69 timer_init.TIM_ClockDivision = TIM_CKD_DIV1;
70 timer_init.TIM_CounterMode = TIM_CounterMode_Up;
71 timer_init.TIM_RepetitionCounter = 0;
72 TIM_TimeBaseInit(TIM1, &timer_init);
73
74 TIM_OCStructInit(&output_compare_init);
75 output_compare_init.TIM_OCMode = TIM_OCMode_PWM1;
76 output_compare_init.TIM_OutputState = TIM_OutputState_Enable;
77 output_compare_init.TIM_OutputNState = TIM_OutputNState_Disable;
78 output_compare_init.TIM_Pulse = 0x00;
79 output_compare_init.TIM_OCPolarity = TIM_OCPolarity_High;
80 output_compare_init.TIM_OCNPolarity = TIM_OCNPolarity_High;
81 TIM_OC1Init(TIM1, &output_compare_init);
82 TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
83
84 TIM_OCStructInit(&output_compare_init);
85 output_compare_init.TIM_OCMode = TIM_OCMode_PWM1;
86 output_compare_init.TIM_OutputState = TIM_OutputState_Enable;
87 output_compare_init.TIM_Pulse = 0x00;
88 output_compare_init.TIM_OCPolarity = TIM_OCPolarity_High;
89 TIM_OC4Init(TIM1, &output_compare_init);
90 TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);
91
92 TIM_ARRPreloadConfig(TIM1, ENABLE);
93 TIM_CtrlPWMOutputs(TIM1, ENABLE);
94 TIM_Cmd(TIM1, ENABLE);
95 }
96
Write()97 void Leds::Write() {
98 GPIO_WriteBit(GPIOC, GPIO_Pin_7, static_cast<BitAction>(gate_));
99 TIM1->CCR1 = exciter_;
100 TIM1->CCR4 = resonator_;
101 }
102
103 } // namespace elements
104