Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_NUVOTON/TARGET_NUC472/analogin_api.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2015-2016 Nuvoton
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16
elessair 0:f269e3021894 17 #include "analogin_api.h"
elessair 0:f269e3021894 18
elessair 0:f269e3021894 19 #if DEVICE_ANALOGIN
elessair 0:f269e3021894 20
elessair 0:f269e3021894 21 #include "cmsis.h"
elessair 0:f269e3021894 22 #include "pinmap.h"
elessair 0:f269e3021894 23 #include "PeripheralPins.h"
elessair 0:f269e3021894 24 #include "nu_modutil.h"
elessair 0:f269e3021894 25
elessair 0:f269e3021894 26 struct nu_adc_var {
elessair 0:f269e3021894 27 uint32_t en_msk;
elessair 0:f269e3021894 28 };
elessair 0:f269e3021894 29
elessair 0:f269e3021894 30 static struct nu_adc_var adc0_var = {
elessair 0:f269e3021894 31 .en_msk = 0
elessair 0:f269e3021894 32 };
elessair 0:f269e3021894 33 static struct nu_adc_var adc1_var = {
elessair 0:f269e3021894 34 .en_msk = 0
elessair 0:f269e3021894 35 };
elessair 0:f269e3021894 36 static struct nu_adc_var adc2_var = {
elessair 0:f269e3021894 37 .en_msk = 0
elessair 0:f269e3021894 38 };
elessair 0:f269e3021894 39 static struct nu_adc_var adc3_var = {
elessair 0:f269e3021894 40 .en_msk = 0
elessair 0:f269e3021894 41 };
elessair 0:f269e3021894 42 static struct nu_adc_var adc4_var = {
elessair 0:f269e3021894 43 .en_msk = 0
elessair 0:f269e3021894 44 };
elessair 0:f269e3021894 45 static struct nu_adc_var adc5_var = {
elessair 0:f269e3021894 46 .en_msk = 0
elessair 0:f269e3021894 47 };
elessair 0:f269e3021894 48 static struct nu_adc_var adc6_var = {
elessair 0:f269e3021894 49 .en_msk = 0
elessair 0:f269e3021894 50 };
elessair 0:f269e3021894 51 static struct nu_adc_var adc7_var = {
elessair 0:f269e3021894 52 .en_msk = 0
elessair 0:f269e3021894 53 };
elessair 0:f269e3021894 54 static struct nu_adc_var adc8_var = {
elessair 0:f269e3021894 55 .en_msk = 0
elessair 0:f269e3021894 56 };
elessair 0:f269e3021894 57 static struct nu_adc_var adc9_var = {
elessair 0:f269e3021894 58 .en_msk = 0
elessair 0:f269e3021894 59 };
elessair 0:f269e3021894 60 static struct nu_adc_var adc10_var = {
elessair 0:f269e3021894 61 .en_msk = 0
elessair 0:f269e3021894 62 };
elessair 0:f269e3021894 63 static struct nu_adc_var adc11_var = {
elessair 0:f269e3021894 64 .en_msk = 0
elessair 0:f269e3021894 65 };
elessair 0:f269e3021894 66
elessair 0:f269e3021894 67 static const struct nu_modinit_s adc_modinit_tab[] = {
elessair 0:f269e3021894 68 {ADC_0_0, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc0_var},
elessair 0:f269e3021894 69 {ADC_0_1, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc1_var},
elessair 0:f269e3021894 70 {ADC_0_2, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc2_var},
elessair 0:f269e3021894 71 {ADC_0_3, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc3_var},
elessair 0:f269e3021894 72 {ADC_0_4, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc4_var},
elessair 0:f269e3021894 73 {ADC_0_5, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc5_var},
elessair 0:f269e3021894 74 {ADC_0_6, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc6_var},
elessair 0:f269e3021894 75 {ADC_0_7, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc7_var},
elessair 0:f269e3021894 76 {ADC_0_8, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc8_var},
elessair 0:f269e3021894 77 {ADC_0_9, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc9_var},
elessair 0:f269e3021894 78 {ADC_0_10, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc10_var},
elessair 0:f269e3021894 79 {ADC_0_11, ADC_MODULE, CLK_CLKSEL1_ADCSEL_HIRC, CLK_CLKDIV0_ADC(1), ADC_RST, ADC_IRQn, &adc11_var}
elessair 0:f269e3021894 80 };
elessair 0:f269e3021894 81
elessair 0:f269e3021894 82 void analogin_init(analogin_t *obj, PinName pin)
elessair 0:f269e3021894 83 {
elessair 0:f269e3021894 84 obj->adc = (ADCName) pinmap_peripheral(pin, PinMap_ADC);
elessair 0:f269e3021894 85 MBED_ASSERT(obj->adc != (ADCName) NC);
elessair 0:f269e3021894 86
elessair 0:f269e3021894 87 const struct nu_modinit_s *modinit = get_modinit(obj->adc, adc_modinit_tab);
elessair 0:f269e3021894 88 MBED_ASSERT(modinit != NULL);
elessair 0:f269e3021894 89 MBED_ASSERT(modinit->modname == obj->adc);
elessair 0:f269e3021894 90
elessair 0:f269e3021894 91 // NOTE: All channels (identified by ADCName) share a ADC module. This reset will also affect other channels of the same ADC module.
elessair 0:f269e3021894 92 if (! ((struct nu_adc_var *) modinit->var)->en_msk) {
elessair 0:f269e3021894 93 // Reset this module if no channel enabled
elessair 0:f269e3021894 94 SYS_ResetModule(modinit->rsetidx);
elessair 0:f269e3021894 95
elessair 0:f269e3021894 96 // Select clock source of paired channels
elessair 0:f269e3021894 97 CLK_SetModuleClock(modinit->clkidx, modinit->clksrc, modinit->clkdiv);
elessair 0:f269e3021894 98 // Enable clock of paired channels
elessair 0:f269e3021894 99 CLK_EnableModuleClock(modinit->clkidx);
elessair 0:f269e3021894 100
elessair 0:f269e3021894 101 // Power on ADC
elessair 0:f269e3021894 102 ADC_POWER_ON(ADC);
elessair 0:f269e3021894 103 }
elessair 0:f269e3021894 104
elessair 0:f269e3021894 105 ADC_T *adc_base = (ADC_T *) NU_MODBASE(obj->adc);
elessair 0:f269e3021894 106 uint32_t chn = NU_MODSUBINDEX(obj->adc);
elessair 0:f269e3021894 107
elessair 0:f269e3021894 108 // Wire pinout
elessair 0:f269e3021894 109 pinmap_pinout(pin, PinMap_ADC);
elessair 0:f269e3021894 110
elessair 0:f269e3021894 111 // Enable channel 0
elessair 0:f269e3021894 112 ADC_Open(adc_base,
elessair 0:f269e3021894 113 ADC_INPUT_MODE_SINGLE_END,
elessair 0:f269e3021894 114 ADC_OPERATION_MODE_SINGLE,
elessair 0:f269e3021894 115 1 << chn); // ADC_CH_0_MASK~ADC_CH_11_MASK
elessair 0:f269e3021894 116
elessair 0:f269e3021894 117 ((struct nu_adc_var *) modinit->var)->en_msk |= 1 << chn;
elessair 0:f269e3021894 118 }
elessair 0:f269e3021894 119
elessair 0:f269e3021894 120 uint16_t analogin_read_u16(analogin_t *obj)
elessair 0:f269e3021894 121 {
elessair 0:f269e3021894 122 ADC_T *adc_base = (ADC_T *) NU_MODBASE(obj->adc);
elessair 0:f269e3021894 123 uint32_t chn = NU_MODSUBINDEX(obj->adc);
elessair 0:f269e3021894 124
elessair 0:f269e3021894 125 ADC_START_CONV(adc_base);
elessair 0:f269e3021894 126 while (adc_base->CTL & ADC_CTL_SWTRG_Msk);
elessair 0:f269e3021894 127 uint16_t conv_res_12 = ADC_GET_CONVERSION_DATA(adc_base, chn);
elessair 0:f269e3021894 128 // Just 12 bits are effective. Convert to 16 bits.
elessair 0:f269e3021894 129 // conv_res_12: 0000 b11b10b9b8 b7b6b5b4 b3b2b1b0
elessair 0:f269e3021894 130 // conv_res_16: b11b10b9b8 b7b6b5b4 b3b2b1b0 b11b10b9b8
elessair 0:f269e3021894 131 uint16_t conv_res_16 = (conv_res_12 << 4) | (conv_res_12 >> 8);
elessair 0:f269e3021894 132
elessair 0:f269e3021894 133 return conv_res_16;
elessair 0:f269e3021894 134 }
elessair 0:f269e3021894 135
elessair 0:f269e3021894 136 float analogin_read(analogin_t *obj)
elessair 0:f269e3021894 137 {
elessair 0:f269e3021894 138 uint16_t value = analogin_read_u16(obj);
elessair 0:f269e3021894 139 return (float) value * (1.0f / (float) 0xFFFF);
elessair 0:f269e3021894 140 }
elessair 0:f269e3021894 141
elessair 0:f269e3021894 142 #endif