Yihui Xiong / BLE_NODE_TEST

Test code for Grove Node BLE

Dependencies:   BLE_API nRF51822

Fork of BLE_LoopbackUART by Bluetooth Low Energy

mbed-src/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/analogin_api.c@10:22480ac31879, 2014-11-27 (annotated)

Committer:
yihui
Date:
Thu Nov 27 09:30:36 2014 +0000
Revision:
10:22480ac31879
Parent:
9:05f0b5a3a70a 
change to new revision hardware

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yihui 9:05f0b5a3a70a 1 /* mbed Microcontroller Library
yihui 9:05f0b5a3a70a 2 * Copyright (c) 2006-2013 ARM Limited
yihui 9:05f0b5a3a70a 3 *
yihui 9:05f0b5a3a70a 4 * Licensed under the Apache License, Version 2.0 (the "License");
yihui 9:05f0b5a3a70a 5 * you may not use this file except in compliance with the License.
yihui 9:05f0b5a3a70a 6 * You may obtain a copy of the License at
yihui 9:05f0b5a3a70a 7 *
yihui 9:05f0b5a3a70a 8 * http://www.apache.org/licenses/LICENSE-2.0
yihui 9:05f0b5a3a70a 9 *
yihui 9:05f0b5a3a70a 10 * Unless required by applicable law or agreed to in writing, software
yihui 9:05f0b5a3a70a 11 * distributed under the License is distributed on an "AS IS" BASIS,
yihui 9:05f0b5a3a70a 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
yihui 9:05f0b5a3a70a 13 * See the License for the specific language governing permissions and
yihui 9:05f0b5a3a70a 14 * limitations under the License.
yihui 9:05f0b5a3a70a 15 */
yihui 9:05f0b5a3a70a 16 #include "mbed_assert.h"
yihui 9:05f0b5a3a70a 17 #include "analogin_api.h"
yihui 9:05f0b5a3a70a 18 #include "cmsis.h"
yihui 9:05f0b5a3a70a 19 #include "pinmap.h"
yihui 9:05f0b5a3a70a 20
yihui 9:05f0b5a3a70a 21 #define ANALOGIN_MEDIAN_FILTER 1
yihui 9:05f0b5a3a70a 22 #define ADC_10BIT_RANGE 0x3FF
yihui 9:05f0b5a3a70a 23 #define ADC_RANGE ADC_10BIT_RANGE
yihui 9:05f0b5a3a70a 24
yihui 9:05f0b5a3a70a 25 static const PinMap PinMap_ADC[] = {
yihui 9:05f0b5a3a70a 26 {p1, ADC0_0, 4},
yihui 9:05f0b5a3a70a 27 {p2, ADC0_0, 8},
yihui 9:05f0b5a3a70a 28 {p3, ADC0_0, 16},
yihui 9:05f0b5a3a70a 29 {p4, ADC0_0, 32},
yihui 9:05f0b5a3a70a 30 {p5, ADC0_0, 64},
yihui 9:05f0b5a3a70a 31 {p6, ADC0_0, 128},
yihui 9:05f0b5a3a70a 32 {NC, NC, 0}
yihui 9:05f0b5a3a70a 33 };
yihui 9:05f0b5a3a70a 34
yihui 9:05f0b5a3a70a 35 void analogin_init(analogin_t *obj, PinName pin)
yihui 9:05f0b5a3a70a 36 {
yihui 9:05f0b5a3a70a 37 int analogInputPin = 0;
yihui 9:05f0b5a3a70a 38 const PinMap *map = PinMap_ADC;
yihui 9:05f0b5a3a70a 39
yihui 9:05f0b5a3a70a 40 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); //(NRF_ADC_Type *)
yihui 9:05f0b5a3a70a 41 MBED_ASSERT(obj->adc != (ADCName)NC);
yihui 9:05f0b5a3a70a 42
yihui 9:05f0b5a3a70a 43 while (map->pin != NC) {
yihui 9:05f0b5a3a70a 44 if (map->pin == pin) {
yihui 9:05f0b5a3a70a 45 analogInputPin = map->function;
yihui 9:05f0b5a3a70a 46 break;
yihui 9:05f0b5a3a70a 47 }
yihui 9:05f0b5a3a70a 48 map++;
yihui 9:05f0b5a3a70a 49 }
yihui 9:05f0b5a3a70a 50 obj->adc_pin = (uint8_t)analogInputPin;
yihui 9:05f0b5a3a70a 51
yihui 9:05f0b5a3a70a 52 NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
yihui 9:05f0b5a3a70a 53 NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
yihui 10:22480ac31879 54 (ADC_CONFIG_INPSEL_AnalogInputNoPrescaling << ADC_CONFIG_INPSEL_Pos) |
yihui 10:22480ac31879 55 (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
yihui 9:05f0b5a3a70a 56 (obj->adc_pin << ADC_CONFIG_PSEL_Pos) |
yihui 9:05f0b5a3a70a 57 (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
yihui 9:05f0b5a3a70a 58 }
yihui 9:05f0b5a3a70a 59
yihui 9:05f0b5a3a70a 60 void analogin_free(analogin_t *obj)
yihui 9:05f0b5a3a70a 61 {
yihui 9:05f0b5a3a70a 62 NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
yihui 9:05f0b5a3a70a 63 (ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
yihui 9:05f0b5a3a70a 64 (ADC_CONFIG_REFSEL_SupplyOneThirdPrescaling << ADC_CONFIG_REFSEL_Pos) |
yihui 9:05f0b5a3a70a 65 (0 << ADC_CONFIG_PSEL_Pos) |
yihui 9:05f0b5a3a70a 66 (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
yihui 9:05f0b5a3a70a 67 }
yihui 9:05f0b5a3a70a 68
yihui 9:05f0b5a3a70a 69 uint16_t analogin_read_u16(analogin_t *obj)
yihui 9:05f0b5a3a70a 70 {
yihui 9:05f0b5a3a70a 71 NRF_ADC->CONFIG &= ~ADC_CONFIG_PSEL_Msk;
yihui 9:05f0b5a3a70a 72 NRF_ADC->CONFIG |= obj->adc_pin << ADC_CONFIG_PSEL_Pos;
yihui 9:05f0b5a3a70a 73 NRF_ADC->TASKS_START = 1;
yihui 9:05f0b5a3a70a 74 while (((NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) >> ADC_BUSY_BUSY_Pos) == ADC_BUSY_BUSY_Busy) {
yihui 9:05f0b5a3a70a 75 }
yihui 9:05f0b5a3a70a 76
yihui 9:05f0b5a3a70a 77 return (uint16_t)NRF_ADC->RESULT; // 10 bit
yihui 9:05f0b5a3a70a 78 }
yihui 9:05f0b5a3a70a 79
yihui 9:05f0b5a3a70a 80 float analogin_read(analogin_t *obj)
yihui 9:05f0b5a3a70a 81 {
yihui 9:05f0b5a3a70a 82 uint16_t value = analogin_read_u16(obj);
yihui 9:05f0b5a3a70a 83 return (float)value * (1.0f / (float)ADC_RANGE);
yihui 9:05f0b5a3a70a 84 }