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targets/TARGET_NORDIC/TARGET_MCU_NRF51822/analogin_api.c@178:d650f5d4c87a, 2017-11-08 (annotated)
- Committer:
- AnnaBridge
- Date:
- Wed Nov 08 13:50:44 2017 +0000
- Revision:
- 178:d650f5d4c87a
- Parent:
- 151:5eaa88a5bcc7
- Child:
- 164:41567bf02252
This updates the lib to the mbed lib v 155
Who changed what in which revision?
User | Revision | Line number | New 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 | #include "cmsis.h" |
<> | 144:ef7eb2e8f9f7 | 19 | #include "pinmap.h" |
<> | 144:ef7eb2e8f9f7 | 20 | |
<> | 144:ef7eb2e8f9f7 | 21 | #define ANALOGIN_MEDIAN_FILTER 1 |
<> | 144:ef7eb2e8f9f7 | 22 | #define ADC_10BIT_RANGE 0x3FF |
<> | 144:ef7eb2e8f9f7 | 23 | #define ADC_RANGE ADC_10BIT_RANGE |
<> | 144:ef7eb2e8f9f7 | 24 | |
<> | 144:ef7eb2e8f9f7 | 25 | static const PinMap PinMap_ADC[] = { |
<> | 151:5eaa88a5bcc7 | 26 | {P0_1, ADC0_0, 4}, |
<> | 151:5eaa88a5bcc7 | 27 | {P0_2, ADC0_0, 8}, |
<> | 151:5eaa88a5bcc7 | 28 | {P0_3, ADC0_0, 16}, |
<> | 151:5eaa88a5bcc7 | 29 | {P0_4, ADC0_0, 32}, |
<> | 151:5eaa88a5bcc7 | 30 | {P0_5, ADC0_0, 64}, |
<> | 151:5eaa88a5bcc7 | 31 | {P0_6, ADC0_0, 128}, |
<> | 144:ef7eb2e8f9f7 | 32 | #ifndef TARGET_NRF51_DONGLE |
<> | 151:5eaa88a5bcc7 | 33 | {P0_26, ADC0_0, 1}, |
<> | 151:5eaa88a5bcc7 | 34 | {P0_27, ADC0_0, 2}, |
<> | 144:ef7eb2e8f9f7 | 35 | #endif |
<> | 144:ef7eb2e8f9f7 | 36 | {NC, NC, 0} |
<> | 144:ef7eb2e8f9f7 | 37 | }; |
<> | 144:ef7eb2e8f9f7 | 38 | |
<> | 144:ef7eb2e8f9f7 | 39 | void analogin_init(analogin_t *obj, PinName pin) |
<> | 144:ef7eb2e8f9f7 | 40 | { |
<> | 144:ef7eb2e8f9f7 | 41 | int analogInputPin = 0; |
<> | 144:ef7eb2e8f9f7 | 42 | const PinMap *map = PinMap_ADC; |
<> | 144:ef7eb2e8f9f7 | 43 | |
<> | 144:ef7eb2e8f9f7 | 44 | obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); //(NRF_ADC_Type *) |
<> | 144:ef7eb2e8f9f7 | 45 | MBED_ASSERT(obj->adc != (ADCName)NC); |
<> | 144:ef7eb2e8f9f7 | 46 | |
<> | 144:ef7eb2e8f9f7 | 47 | while (map->pin != NC) { |
<> | 144:ef7eb2e8f9f7 | 48 | if (map->pin == pin) { |
<> | 144:ef7eb2e8f9f7 | 49 | analogInputPin = map->function; |
<> | 144:ef7eb2e8f9f7 | 50 | break; |
<> | 144:ef7eb2e8f9f7 | 51 | } |
<> | 144:ef7eb2e8f9f7 | 52 | map++; |
<> | 144:ef7eb2e8f9f7 | 53 | } |
<> | 144:ef7eb2e8f9f7 | 54 | obj->adc_pin = (uint8_t)analogInputPin; |
<> | 144:ef7eb2e8f9f7 | 55 | |
<> | 144:ef7eb2e8f9f7 | 56 | NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled; |
<> | 144:ef7eb2e8f9f7 | 57 | NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) | |
<> | 144:ef7eb2e8f9f7 | 58 | (ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) | |
<> | 144:ef7eb2e8f9f7 | 59 | (ADC_CONFIG_REFSEL_SupplyOneThirdPrescaling << ADC_CONFIG_REFSEL_Pos) | |
<> | 144:ef7eb2e8f9f7 | 60 | (analogInputPin << ADC_CONFIG_PSEL_Pos) | |
<> | 144:ef7eb2e8f9f7 | 61 | (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos); |
<> | 144:ef7eb2e8f9f7 | 62 | } |
<> | 144:ef7eb2e8f9f7 | 63 | |
<> | 144:ef7eb2e8f9f7 | 64 | uint16_t analogin_read_u16(analogin_t *obj) |
<> | 144:ef7eb2e8f9f7 | 65 | { |
<> | 144:ef7eb2e8f9f7 | 66 | NRF_ADC->CONFIG &= ~ADC_CONFIG_PSEL_Msk; |
<> | 144:ef7eb2e8f9f7 | 67 | NRF_ADC->CONFIG |= obj->adc_pin << ADC_CONFIG_PSEL_Pos; |
<> | 144:ef7eb2e8f9f7 | 68 | NRF_ADC->EVENTS_END = 0; |
<> | 144:ef7eb2e8f9f7 | 69 | NRF_ADC->TASKS_START = 1; |
<> | 144:ef7eb2e8f9f7 | 70 | |
<> | 144:ef7eb2e8f9f7 | 71 | while (!NRF_ADC->EVENTS_END) { |
<> | 144:ef7eb2e8f9f7 | 72 | } |
<> | 144:ef7eb2e8f9f7 | 73 | |
<> | 144:ef7eb2e8f9f7 | 74 | return (uint16_t)NRF_ADC->RESULT; // 10 bit |
<> | 144:ef7eb2e8f9f7 | 75 | } |
<> | 144:ef7eb2e8f9f7 | 76 | |
<> | 144:ef7eb2e8f9f7 | 77 | float analogin_read(analogin_t *obj) |
<> | 144:ef7eb2e8f9f7 | 78 | { |
<> | 144:ef7eb2e8f9f7 | 79 | uint16_t value = analogin_read_u16(obj); |
<> | 144:ef7eb2e8f9f7 | 80 | return (float)value * (1.0f / (float)ADC_RANGE); |
<> | 144:ef7eb2e8f9f7 | 81 | } |