Amit Gandhi / mbed-dev

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-dev by mbed official

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?

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 #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 }