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Merge pull request #4148 from LudwigKnuepfer/pr/nrf51-adc

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cpu/nrf51 + boards: add ADC implementation
This commit is contained in:
Peter Kietzmann 2015-10-27 14:49:32 +01:00
commit 59e2fd8a22
7 changed files with 184 additions and 0 deletions
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1
boards/airfy-beacon/Makefile.features
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@ -1,4 +1,5 @@
# Put defined MCU peripherals here (in alphabetical order)
FEATURES_PROVIDED += periph_adc
FEATURES_PROVIDED += periph_cpuid
FEATURES_PROVIDED += periph_gpio
FEATURES_PROVIDED += periph_random

16
boards/airfy-beacon/include/periph_conf.h
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@ -123,6 +123,22 @@
#define SPI_0_PIN_SCK 15
/** @} */
/**
* @name ADC configuration
* @{
*/
#define ADC_NUMOF (1U)
#define ADC_0_EN 1
#define ADC_MAX_CHANNELS 4
/* ADC 0 device configuration */
#define ADC_0_CHANNELS 4
#define ADC_0_CH0 ADC_CONFIG_PSEL_AnalogInput3
#define ADC_0_CH1 ADC_CONFIG_PSEL_AnalogInput4
#define ADC_0_CH2 ADC_CONFIG_PSEL_AnalogInput5
#define ADC_0_CH3 ADC_CONFIG_PSEL_AnalogInput6
/** @} */
/**
* @name Radio device configuration
*

1
boards/pca10005/Makefile.features
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@ -1,4 +1,5 @@
# Put defined MCU peripherals here (in alphabetical order)
FEATURES_PROVIDED += periph_adc
FEATURES_PROVIDED += periph_cpuid
FEATURES_PROVIDED += periph_gpio
FEATURES_PROVIDED += periph_random

16
boards/pca10005/include/periph_conf.h
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@ -130,6 +130,22 @@ extern "C" {
#define SPI_1_PIN_SCK 22
/** @} */
/**
* @name ADC configuration
* @{
*/
#define ADC_NUMOF (1U)
#define ADC_0_EN 1
#define ADC_MAX_CHANNELS 4
/* ADC 0 device configuration */
#define ADC_0_CHANNELS 4
#define ADC_0_CH0 ADC_CONFIG_PSEL_AnalogInput0
#define ADC_0_CH1 ADC_CONFIG_PSEL_AnalogInput1
#define ADC_0_CH2 ADC_CONFIG_PSEL_AnalogInput2
#define ADC_0_CH3 ADC_CONFIG_PSEL_AnalogInput3
/** @} */
/**
* @name Radio device configuration
*

1
boards/yunjia-nrf51822/Makefile.features
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@ -1,4 +1,5 @@
# Put defined MCU peripherals here (in alphabetical order)
FEATURES_PROVIDED += periph_adc
FEATURES_PROVIDED += periph_cpuid
FEATURES_PROVIDED += periph_gpio
FEATURES_PROVIDED += periph_random

16
boards/yunjia-nrf51822/include/periph_conf.h
View File

@ -128,6 +128,22 @@ extern "C" {
#define SPI_1_PIN_SCK 22
/** @} */
/**
* @name ADC configuration
* @{
*/
#define ADC_NUMOF (1U)
#define ADC_0_EN 1
#define ADC_MAX_CHANNELS 4
/* ADC 0 device configuration */
#define ADC_0_CHANNELS 4
#define ADC_0_CH0 ADC_CONFIG_PSEL_AnalogInput4
#define ADC_0_CH1 ADC_CONFIG_PSEL_AnalogInput5
#define ADC_0_CH2 ADC_CONFIG_PSEL_AnalogInput6
#define ADC_0_CH3 ADC_CONFIG_PSEL_AnalogInput7
/** @} */
/**
* @name Radio device configuration
*

133
cpu/nrf51/periph/adc.c Normal file
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@ -0,0 +1,133 @@
/*
* Copyright (C) 2014 Freie Universität Berlin
* Copyright (C) 2015 Ludwig Knüpfer
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @ingroup cpu_nrf51822
* @{
*
* @file
* @brief Low-level UART driver implementation
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @author Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
*
* @}
*/
#include "cpu.h"
#include "periph/adc.h"
#include "periph_conf.h"
/* guard file in case no ADC device is defined */
#if ADC_NUMOF
/* save the maximum value configured for the ADC */
int adc_max_value;
int adc_init(adc_t dev, adc_precision_t precision)
{
/* the NRF51822 only supports one ADC... */
if (dev != ADC_0) {
return -2;
}
/* power on ADC */
NRF_ADC->POWER = 1;
/* disable ADC interrupts */
NRF_ADC->INTENSET = (ADC_INTENSET_END_Disabled << ADC_INTENSET_END_Pos);
/* configure ADC, set precision, internal reference to VBG */
switch (precision) {
case ADC_RES_8BIT:
adc_max_value = 255;
NRF_ADC->CONFIG = (ADC_CONFIG_RES_8bit << ADC_CONFIG_RES_Pos);
break;
case ADC_RES_10BIT:
adc_max_value = 1023;
NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos);
break;
default:
NRF_ADC->POWER = 0;
return -1;
}
/* select the reference voltage / prescaler */
NRF_ADC->CONFIG |= (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
NRF_ADC->CONFIG |= (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos);
NRF_ADC->CONFIG |= (ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos);
/* enable the ADC */
NRF_ADC->ENABLE = (ADC_ENABLE_ENABLE_Enabled << ADC_ENABLE_ENABLE_Pos);
return 0;
}
int adc_sample(adc_t dev, int channel)
{
if (dev != ADC_0) {
return -2;
}
/* set channel */
NRF_ADC->CONFIG &= ~(ADC_CONFIG_PSEL_Msk);
NRF_ADC->CONFIG |= (ADC_CONFIG_PSEL_Disabled << ADC_CONFIG_PSEL_Pos);
switch (channel) {
case 0:
NRF_ADC->CONFIG |= (ADC_0_CH0 << ADC_CONFIG_PSEL_Pos);
break;
case 1:
NRF_ADC->CONFIG |= (ADC_0_CH1 << ADC_CONFIG_PSEL_Pos);
break;
case 2:
NRF_ADC->CONFIG |= (ADC_0_CH2 << ADC_CONFIG_PSEL_Pos);
break;
case 3:
NRF_ADC->CONFIG |= (ADC_0_CH3 << ADC_CONFIG_PSEL_Pos);
break;
default:
return -1;
}
/* start conversion */
NRF_ADC->TASKS_START = 1;
/* wait for conversion to be complete */
while (((NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) >> ADC_BUSY_BUSY_Pos) == ADC_BUSY_BUSY_Busy);
NRF_ADC->EVENTS_END = 1;
/* return result */
return (int)NRF_ADC->RESULT;
}
void adc_poweron(adc_t dev)
{
if (dev == ADC_0) {
NRF_ADC->POWER = 1;
}
}
void adc_poweroff(adc_t dev)
{
if (dev == ADC_0) {
NRF_ADC->POWER = 0;
}
}
int adc_map(adc_t dev, int value, int min, int max)
{
return (int)adc_mapf(dev, value, (float)min, (float)max);
}
float adc_mapf(adc_t dev, int value, float min, float max)
{
return ((max - min) / ((float)adc_max_value)) * value;
}
#endif /* ADC_NUMOF */