Iftikhar Aziz / mbed-dev

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Dependents:   LSS_Rev_1

Fork of mbed-dev by Umar Naeem

targets/TARGET_RENESAS/TARGET_RZ_A1H/analogin_api.c@166:33361e55dd8c, 2017-08-23 (annotated)

Committer:
iftaziz
Date:
Wed Aug 23 10:32:38 2017 +0000
Revision:
166:33361e55dd8c
Parent:
149:156823d33999 
r1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 17 #include "analogin_api.h"
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 20 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 #include "adc_iodefine.h"
<> 144:ef7eb2e8f9f7 23 #include "cpg_iodefine.h"
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 #define ANALOGIN_MEDIAN_FILTER 0
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 static const PinMap PinMap_ADC[] = {
<> 144:ef7eb2e8f9f7 28 {P1_8, AN0, 1},
<> 144:ef7eb2e8f9f7 29 {P1_9, AN1, 1},
<> 144:ef7eb2e8f9f7 30 {P1_10, AN2, 1},
<> 144:ef7eb2e8f9f7 31 {P1_11, AN3, 1},
<> 144:ef7eb2e8f9f7 32 {P1_12, AN4, 1},
<> 144:ef7eb2e8f9f7 33 {P1_13, AN5, 1},
<> 144:ef7eb2e8f9f7 34 {P1_14, AN6, 1},
<> 144:ef7eb2e8f9f7 35 {P1_15, AN7, 1},
<> 144:ef7eb2e8f9f7 36 {NC, NC, 0}
<> 144:ef7eb2e8f9f7 37 };
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 static volatile uint16_t *ADCDR[] = {
<> 144:ef7eb2e8f9f7 40 &ADCADDRA,
<> 144:ef7eb2e8f9f7 41 &ADCADDRB,
<> 144:ef7eb2e8f9f7 42 &ADCADDRC,
<> 144:ef7eb2e8f9f7 43 &ADCADDRD,
<> 144:ef7eb2e8f9f7 44 &ADCADDRE,
<> 144:ef7eb2e8f9f7 45 &ADCADDRF,
<> 144:ef7eb2e8f9f7 46 &ADCADDRG,
<> 144:ef7eb2e8f9f7 47 &ADCADDRH,
<> 144:ef7eb2e8f9f7 48 };
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 void analogin_init(analogin_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 51 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
<> 144:ef7eb2e8f9f7 52 MBED_ASSERT(obj->adc != (ADCName)NC);
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 CPGSTBCR3 &= ~(1 << 1);
<> 144:ef7eb2e8f9f7 55 CPGSTBCR6 &= ~(1 << 7);
<> 144:ef7eb2e8f9f7 56
<> 144:ef7eb2e8f9f7 57 // 15: ADF 14: ADIE 13: ADST, [12:9] TRGS..0
<> 144:ef7eb2e8f9f7 58 // [8:6] CKS 010 :: 340tclk
<> 144:ef7eb2e8f9f7 59 // [5:3] MDS 000 :: single mode
<> 144:ef7eb2e8f9f7 60 // [2:0] CH 000 :: AN0
<> 144:ef7eb2e8f9f7 61 ADCADCSR = 0x0080;
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 pinmap_pinout(pin, PinMap_ADC);
<> 144:ef7eb2e8f9f7 64 }
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 static inline uint32_t adc_read(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 67 volatile uint16_t data;
<> 144:ef7eb2e8f9f7 68
<> 144:ef7eb2e8f9f7 69 // Select the appropriate channel and start conversion
<> 144:ef7eb2e8f9f7 70 ADCADCSR &= 0xfff8;
<> 144:ef7eb2e8f9f7 71 ADCADCSR |= (1 << 13 | (obj->adc & 0x7));
<> 144:ef7eb2e8f9f7 72
<> 144:ef7eb2e8f9f7 73 // Wait end of conversion
<> 144:ef7eb2e8f9f7 74 do {
<> 144:ef7eb2e8f9f7 75 data = ADCADCSR;
<> 144:ef7eb2e8f9f7 76 } while (((data & (1 << 15)) == 0) || ((data & (1 << 13)) != 0));
<> 144:ef7eb2e8f9f7 77
<> 144:ef7eb2e8f9f7 78 // clear flag
<> 144:ef7eb2e8f9f7 79 ADCADCSR &= ~(1 << 15);
<> 144:ef7eb2e8f9f7 80
<> 144:ef7eb2e8f9f7 81 return ((*(ADCDR[obj->adc])) >> 4) & 0x0FFF; // 12 bits range
<> 144:ef7eb2e8f9f7 82 }
<> 144:ef7eb2e8f9f7 83
<> 144:ef7eb2e8f9f7 84 #if ANALOGIN_MEDIAN_FILTER
<> 144:ef7eb2e8f9f7 85 static inline void order(uint32_t *a, uint32_t *b) {
<> 144:ef7eb2e8f9f7 86 if (*a > *b) {
<> 144:ef7eb2e8f9f7 87 uint32_t t = *a;
<> 144:ef7eb2e8f9f7 88 *a = *b;
<> 144:ef7eb2e8f9f7 89 *b = t;
<> 144:ef7eb2e8f9f7 90 }
<> 144:ef7eb2e8f9f7 91 }
<> 144:ef7eb2e8f9f7 92 #endif
<> 144:ef7eb2e8f9f7 93
<> 144:ef7eb2e8f9f7 94 static inline uint32_t adc_read_u32(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 95 uint32_t value;
<> 144:ef7eb2e8f9f7 96 #if ANALOGIN_MEDIAN_FILTER
<> 144:ef7eb2e8f9f7 97 uint32_t v1 = adc_read(obj);
<> 144:ef7eb2e8f9f7 98 uint32_t v2 = adc_read(obj);
<> 144:ef7eb2e8f9f7 99 uint32_t v3 = adc_read(obj);
<> 144:ef7eb2e8f9f7 100 order(&v1, &v2);
<> 144:ef7eb2e8f9f7 101 order(&v2, &v3);
<> 144:ef7eb2e8f9f7 102 order(&v1, &v2);
<> 144:ef7eb2e8f9f7 103 value = v2;
<> 144:ef7eb2e8f9f7 104 #else
<> 144:ef7eb2e8f9f7 105 value = adc_read(obj);
<> 144:ef7eb2e8f9f7 106 #endif
<> 144:ef7eb2e8f9f7 107 return value;
<> 144:ef7eb2e8f9f7 108 }
<> 144:ef7eb2e8f9f7 109
<> 144:ef7eb2e8f9f7 110 uint16_t analogin_read_u16(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 111 uint32_t value = adc_read_u32(obj);
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 return (value << 4) | ((value >> 8) & 0x000F); // 12-bit to 16-bit conversion
<> 144:ef7eb2e8f9f7 114 }
<> 144:ef7eb2e8f9f7 115
<> 144:ef7eb2e8f9f7 116 float analogin_read(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 117 uint32_t value = adc_read_u32(obj);
<> 144:ef7eb2e8f9f7 118
<> 144:ef7eb2e8f9f7 119 return (float)value * (1.0f / (float)0x0FFF); // 12 bits range
<> 144:ef7eb2e8f9f7 120 }