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Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NORDIC/TARGET_NRF51822/analogin_api.c@217:d0ccc61c1fd4, 2014-05-27 (annotated)

Committer:
mbed_official
Date:
Tue May 27 13:00:07 2014 +0100
Revision:
217:d0ccc61c1fd4
Parent:
85:e1a8e879a6a9
Child:
227:7bd0639b8911
Synchronized with git revision bd83615ac55fe00f83e44dafc7ba017a3850f4e5



Full URL: https://github.com/mbedmicro/mbed/commit/bd83615ac55fe00f83e44dafc7ba017a3850f4e5/



[NRF51822] analog read - set channel

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 85:e1a8e879a6a9 16 #include "analogin_api.h"
mbed_official 85:e1a8e879a6a9 17 #include "cmsis.h"
mbed_official 85:e1a8e879a6a9 18 #include "pinmap.h"
mbed_official 85:e1a8e879a6a9 19 #include "error.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 85:e1a8e879a6a9 40 if (obj->adc == (ADCName)NC) {
mbed_official 85:e1a8e879a6a9 41 error("ADC pin mapping failed");
mbed_official 85:e1a8e879a6a9 42 }
mbed_official 85:e1a8e879a6a9 43
mbed_official 85:e1a8e879a6a9 44 while (map->pin != NC) {
mbed_official 85:e1a8e879a6a9 45 if (map->pin == pin){
mbed_official 85:e1a8e879a6a9 46 analogInputPin = map->function;
mbed_official 85:e1a8e879a6a9 47 break;
mbed_official 85:e1a8e879a6a9 48 }
mbed_official 85:e1a8e879a6a9 49 map++;
mbed_official 85:e1a8e879a6a9 50 }
mbed_official 217:d0ccc61c1fd4 51 obj->adc_pin = (uint8_t)analogInputPin;
mbed_official 85:e1a8e879a6a9 52
mbed_official 85:e1a8e879a6a9 53 NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
mbed_official 85:e1a8e879a6a9 54 NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
mbed_official 85:e1a8e879a6a9 55 (ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling<< ADC_CONFIG_INPSEL_Pos) |
mbed_official 85:e1a8e879a6a9 56 (ADC_CONFIG_REFSEL_SupplyOneThirdPrescaling << ADC_CONFIG_REFSEL_Pos) |
mbed_official 85:e1a8e879a6a9 57 (analogInputPin << ADC_CONFIG_PSEL_Pos) |
mbed_official 85:e1a8e879a6a9 58 (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
mbed_official 85:e1a8e879a6a9 59 }
mbed_official 85:e1a8e879a6a9 60
mbed_official 85:e1a8e879a6a9 61 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 217:d0ccc61c1fd4 62 NRF_ADC->CONFIG &= ~ADC_CONFIG_PSEL_Msk;
mbed_official 217:d0ccc61c1fd4 63 NRF_ADC->CONFIG |= obj->adc_pin << ADC_CONFIG_PSEL_Pos;
mbed_official 85:e1a8e879a6a9 64 NRF_ADC->TASKS_START = 1;
mbed_official 85:e1a8e879a6a9 65 while ( ( (NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) >> ADC_BUSY_BUSY_Pos) == ADC_BUSY_BUSY_Busy)
mbed_official 85:e1a8e879a6a9 66 {
mbed_official 85:e1a8e879a6a9 67 }
mbed_official 85:e1a8e879a6a9 68
mbed_official 85:e1a8e879a6a9 69 return (uint16_t)NRF_ADC->RESULT; // 10 bit
mbed_official 85:e1a8e879a6a9 70 }
mbed_official 85:e1a8e879a6a9 71
mbed_official 85:e1a8e879a6a9 72 float analogin_read(analogin_t *obj) {
mbed_official 85:e1a8e879a6a9 73 uint16_t value = analogin_read_u16(obj);
mbed_official 85:e1a8e879a6a9 74 return (float)value * (1.0f / (float)ADC_RANGE);
mbed_official 85:e1a8e879a6a9 75 }