1 // Copyright 2014 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 ADC2 - used for scanning pots.
28
29 #include "elements/drivers/pots_adc.h"
30
31 #include <stm32f4xx_conf.h>
32
33 namespace elements {
34
35 /* static */
36 uint8_t PotsAdc::addresses_[POT_LAST] = {
37 28, // POT_EXCITER_ENVELOPE_SHAPE,
38 30, // POT_EXCITER_BOW_LEVEL,
39 5, // POT_EXCITER_BOW_TIMBRE,
40 1, // POT_EXCITER_BOW_TIMBRE_ATTENUVERTER,
41 29, // POT_EXCITER_BLOW_LEVEL,
42 31, // POT_EXCITER_BLOW_META,
43 2, // POT_EXCITER_BLOW_META_ATTENUVERTER,
44 7, // POT_EXCITER_BLOW_TIMBRE,
45 11, // POT_EXCITER_BLOW_TIMBRE_ATTENUVERTER,
46 22, // POT_EXCITER_STRIKE_LEVEL,
47 20, // POT_EXCITER_STRIKE_META,
48 8, // POT_EXCITER_STRIKE_META_ATTENUVERTER,
49 6, // POT_EXCITER_STRIKE_TIMBRE,
50 9, // POT_EXCITER_STRIKE_TIMBRE_ATTENUVERTER,
51 23, // POT_RESONATOR_COARSE,
52 26, // POT_RESONATOR_FINE,
53 25, // POT_RESONATOR_FM_ATTENUVERTER,
54 21, // POT_RESONATOR_GEOMETRY,
55 19, // POT_RESONATOR_GEOMETRY_ATTENUVERTER,
56 24, // POT_RESONATOR_BRIGHTNESS,
57 17, // POT_RESONATOR_RIGHTNESS_ATTENUVERTER,
58 4, // POT_RESONATOR_DAMPING,
59 10, // POT_RESONATOR_DAMPING_ATTENUVERTER,
60 0, // POT_RESONATOR_POSITION,
61 16, // POT_RESONATOR_POSITION_ATTENUVERTER,
62 27, // POT_SPACE,
63 18, // POT_SPACE_ATTENUVERTER
64 };
65
Init()66 void PotsAdc::Init() {
67 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC, ENABLE);
68 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE);
69
70 ADC_CommonInitTypeDef adc_common_init;
71 ADC_InitTypeDef adc_init;
72 GPIO_InitTypeDef gpio_init;
73
74 // Configure the ADC pin.
75 gpio_init.GPIO_Pin = GPIO_Pin_0;
76 gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
77 gpio_init.GPIO_Mode = GPIO_Mode_AN;
78 GPIO_Init(GPIOC, &gpio_init);
79
80 // Configure the mux chip selector and inhibit all chips.
81 gpio_init.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8;
82 gpio_init.GPIO_Mode = GPIO_Mode_OUT;
83 gpio_init.GPIO_OType = GPIO_OType_PP;
84 gpio_init.GPIO_Speed = GPIO_Speed_2MHz;
85 gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
86 GPIO_Init(GPIOB, &gpio_init);
87 GPIO_SetBits(GPIOB, GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8);
88
89 // Configure the address lines.
90 gpio_init.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
91 gpio_init.GPIO_Mode = GPIO_Mode_OUT;
92 gpio_init.GPIO_OType = GPIO_OType_PP;
93 gpio_init.GPIO_Speed = GPIO_Speed_2MHz;
94 gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
95 GPIO_Init(GPIOC, &gpio_init);
96 GPIO_ResetBits(GPIOC, GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
97
98 adc_common_init.ADC_Mode = ADC_Mode_Independent;
99 adc_common_init.ADC_Prescaler = ADC_Prescaler_Div8;
100 adc_common_init.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
101 adc_common_init.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
102 ADC_CommonInit(&adc_common_init);
103
104 adc_init.ADC_Resolution = ADC_Resolution_12b;
105 adc_init.ADC_ScanConvMode = DISABLE;
106 adc_init.ADC_ContinuousConvMode = DISABLE;
107 adc_init.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
108 adc_init.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
109 adc_init.ADC_DataAlign = ADC_DataAlign_Left;
110 adc_init.ADC_NbrOfConversion = 1;
111 ADC_Init(ADC2, &adc_init);
112
113 ADC_RegularChannelConfig(ADC2, ADC_Channel_10, 1, ADC_SampleTime_480Cycles);
114
115 ADC_Cmd(ADC2, ENABLE);
116
117 index_ = POT_LAST - 1;
118 last_read_ = 0;
119 state_ = false;
120 Scan();
121 }
122
DeInit()123 void PotsAdc::DeInit() {
124 ADC_DeInit();
125 }
126
Scan()127 void PotsAdc::Scan() {
128 if (state_) {
129 // Read the value from the previous conversion.
130 values_[index_] = ADC2->DR;
131 last_read_ = index_;
132 ++index_;
133 if (index_ >= POT_LAST) {
134 index_ = 0;
135 }
136
137 uint8_t address = addresses_[index_];
138
139 // Inhibit all muxes.
140 GPIO_SetBits(GPIOB, GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8);
141
142 // Write the mux address.
143 GPIO_WriteBit(GPIOC, GPIO_Pin_15, static_cast<BitAction>(address & 1));
144 GPIO_WriteBit(GPIOC, GPIO_Pin_14, static_cast<BitAction>(address & 2));
145 GPIO_WriteBit(GPIOC, GPIO_Pin_13, static_cast<BitAction>(address & 4));
146
147 // Activate the right mux.
148 GPIO_ResetBits(GPIOB, GPIO_Pin_5 << (address >> 3));
149 } else {
150 ADC_SoftwareStartConv(ADC2);
151 }
152 state_ = !state_;
153 }
154
155 } // namespace elements
156