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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NORDIC/TARGET_NRF51822/analogin_api.c@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
217:d0ccc61c1fd4 
Synchronized with git revision d58d532ebc0e0a96f4fffb8edefc082b71b964af



Full URL: https://github.com/mbedmicro/mbed/commit/d58d532ebc0e0a96f4fffb8edefc082b71b964af/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 85:e1a8e879a6a9 1 /* mbed Microcontroller Library
mbed_official 85:e1a8e879a6a9 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 85:e1a8e879a6a9 3 *
mbed_official 85:e1a8e879a6a9 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 85:e1a8e879a6a9 5 * you may not use this file except in compliance with the License.
mbed_official 85:e1a8e879a6a9 6 * You may obtain a copy of the License at
mbed_official 85:e1a8e879a6a9 7 *
mbed_official 85:e1a8e879a6a9 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 85:e1a8e879a6a9 9 *
mbed_official 85:e1a8e879a6a9 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 85:e1a8e879a6a9 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 85:e1a8e879a6a9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 85:e1a8e879a6a9 13 * See the License for the specific language governing permissions and
mbed_official 85:e1a8e879a6a9 14 * limitations under the License.
mbed_official 85:e1a8e879a6a9 15 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
mbed_official 85:e1a8e879a6a9 17 #include "analogin_api.h"
mbed_official 85:e1a8e879a6a9 18 #include "cmsis.h"
mbed_official 85:e1a8e879a6a9 19 #include "pinmap.h"
mbed_official 85:e1a8e879a6a9 20
mbed_official 85:e1a8e879a6a9 21 #define ANALOGIN_MEDIAN_FILTER 1
mbed_official 85:e1a8e879a6a9 22 #define ADC_10BIT_RANGE 0x3FF
mbed_official 85:e1a8e879a6a9 23 #define ADC_RANGE ADC_10BIT_RANGE
mbed_official 85:e1a8e879a6a9 24
mbed_official 85:e1a8e879a6a9 25 static const PinMap PinMap_ADC[] = {
mbed_official 85:e1a8e879a6a9 26 {p1, ADC0_0, 4},
mbed_official 85:e1a8e879a6a9 27 {p2, ADC0_0, 8},
mbed_official 85:e1a8e879a6a9 28 {p3, ADC0_0, 16},
mbed_official 85:e1a8e879a6a9 29 {p4, ADC0_0, 32},
mbed_official 85:e1a8e879a6a9 30 {p5, ADC0_0, 64},
mbed_official 85:e1a8e879a6a9 31 {p6, ADC0_0, 128},
mbed_official 85:e1a8e879a6a9 32 {NC , NC , 0}
mbed_official 85:e1a8e879a6a9 33 };
mbed_official 85:e1a8e879a6a9 34
mbed_official 85:e1a8e879a6a9 35 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 85:e1a8e879a6a9 36 int analogInputPin=0;
mbed_official 85:e1a8e879a6a9 37 const PinMap *map = PinMap_ADC;
mbed_official 85:e1a8e879a6a9 38
mbed_official 85:e1a8e879a6a9 39 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); //(NRF_ADC_Type *)
mbed_official 227:7bd0639b8911 40 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 85:e1a8e879a6a9 41
mbed_official 85:e1a8e879a6a9 42 while (map->pin != NC) {
mbed_official 85:e1a8e879a6a9 43 if (map->pin == pin){
mbed_official 85:e1a8e879a6a9 44 analogInputPin = map->function;
mbed_official 85:e1a8e879a6a9 45 break;
mbed_official 85:e1a8e879a6a9 46 }
mbed_official 85:e1a8e879a6a9 47 map++;
mbed_official 85:e1a8e879a6a9 48 }
mbed_official 217:d0ccc61c1fd4 49 obj->adc_pin = (uint8_t)analogInputPin;
mbed_official 85:e1a8e879a6a9 50
mbed_official 227:7bd0639b8911 51 NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
mbed_official 85:e1a8e879a6a9 52 NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
mbed_official 85:e1a8e879a6a9 53 (ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling<< ADC_CONFIG_INPSEL_Pos) |
mbed_official 85:e1a8e879a6a9 54 (ADC_CONFIG_REFSEL_SupplyOneThirdPrescaling << ADC_CONFIG_REFSEL_Pos) |
mbed_official 85:e1a8e879a6a9 55 (analogInputPin << ADC_CONFIG_PSEL_Pos) |
mbed_official 227:7bd0639b8911 56 (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
mbed_official 85:e1a8e879a6a9 57 }
mbed_official 85:e1a8e879a6a9 58
mbed_official 85:e1a8e879a6a9 59 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 217:d0ccc61c1fd4 60 NRF_ADC->CONFIG &= ~ADC_CONFIG_PSEL_Msk;
mbed_official 217:d0ccc61c1fd4 61 NRF_ADC->CONFIG |= obj->adc_pin << ADC_CONFIG_PSEL_Pos;
mbed_official 85:e1a8e879a6a9 62 NRF_ADC->TASKS_START = 1;
mbed_official 85:e1a8e879a6a9 63 while ( ( (NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) >> ADC_BUSY_BUSY_Pos) == ADC_BUSY_BUSY_Busy)
mbed_official 85:e1a8e879a6a9 64 {
mbed_official 85:e1a8e879a6a9 65 }
mbed_official 85:e1a8e879a6a9 66
mbed_official 85:e1a8e879a6a9 67 return (uint16_t)NRF_ADC->RESULT; // 10 bit
mbed_official 85:e1a8e879a6a9 68 }
mbed_official 85:e1a8e879a6a9 69
mbed_official 85:e1a8e879a6a9 70 float analogin_read(analogin_t *obj) {
mbed_official 85:e1a8e879a6a9 71 uint16_t value = analogin_read_u16(obj);
mbed_official 85:e1a8e879a6a9 72 return (float)value * (1.0f / (float)ADC_RANGE);
mbed_official 85:e1a8e879a6a9 73 }