mbed-src - mbed library sources

Users » mbed_official » Code » mbed-src

mbed library sources

Dependents: Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more

Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

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

targets/hal/TARGET_Atmel/TARGET_SAM21/analogin_api.c

Committer:: mbed_official
Date:: 2015-07-17
Revision:: 592:a274ee790e56

File content as of revision 592:a274ee790e56:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "mbed_assert.h"
#include "analogin_api.h"

#include "cmsis.h"
#include "pinmap.h"
#include "PeripheralPins.h"
#include "adc.h"
#include "status_codes.h"

struct adc_module adc_instance;

void adc_configure_ain_pin(uint32_t pin)
{
#define PIN_INVALID_ADC_AIN    0xFFFFUL

    /* Pinmapping table for AINxx -> GPIO pin number */
    const uint32_t pinmapping[] = {
#if (SAMD20E | SAMD21E)
        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
        PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19,
#elif (SAMD20G | SAMD21G)
        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
        PIN_PB08B_ADC_AIN2,  PIN_PB09B_ADC_AIN3,
        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
        PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19,
#elif (SAMD20J | SAMD21J)
        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
        PIN_PB08B_ADC_AIN2,  PIN_PB09B_ADC_AIN3,
        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
        PIN_PB00B_ADC_AIN8,  PIN_PB01B_ADC_AIN9,
        PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11,
        PIN_PB04B_ADC_AIN12, PIN_PB05B_ADC_AIN13,
        PIN_PB06B_ADC_AIN14, PIN_PB07B_ADC_AIN15,
        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
        PIN_PA10B_ADC_AIN18, PIN_PA11B_ADC_AIN19,
#elif SAMR21E
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
#elif SAMR21G
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_PA04B_ADC_AIN4,  PIN_PA05B_ADC_AIN5,
        PIN_PA06B_ADC_AIN6,  PIN_PA07B_ADC_AIN7,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_PB02B_ADC_AIN10, PIN_PB03B_ADC_AIN11,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_PA08B_ADC_AIN16, PIN_PA09B_ADC_AIN17,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
#elif (SAMD10C | SAMD11C)
        PIN_PA02B_ADC_AIN0,  PIN_INVALID_ADC_AIN,
        PIN_PA04B_ADC_AIN2,  PIN_PA05B_ADC_AIN3,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_PA14B_ADC_AIN6,  PIN_PA15B_ADC_AIN7,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
#elif (SAMD10DS | SAMD11DS)
        PIN_PA02B_ADC_AIN0,  PIN_INVALID_ADC_AIN,
        PIN_PA04B_ADC_AIN2,  PIN_PA05B_ADC_AIN3,
        PIN_PA06B_ADC_AIN4,  PIN_PA07B_ADC_AIN5,
        PIN_PA14B_ADC_AIN6,  PIN_PA15B_ADC_AIN7,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
#elif (SAMD10DM | SAMD11DM)
        PIN_PA02B_ADC_AIN0,  PIN_PA03B_ADC_AIN1,
        PIN_PA04B_ADC_AIN2,  PIN_PA05B_ADC_AIN3,
        PIN_PA06B_ADC_AIN4,  PIN_PA07B_ADC_AIN5,
        PIN_PA14B_ADC_AIN6,  PIN_PA15B_ADC_AIN7,
        PIN_PA10B_ADC_AIN8,  PIN_PA11B_ADC_AIN9,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
        PIN_INVALID_ADC_AIN, PIN_INVALID_ADC_AIN,
#else
#  error ADC pin mappings are not defined for this device.
#endif
    };

    uint32_t pin_map_result = PIN_INVALID_ADC_AIN;

    if (pin <= ADC_EXTCHANNEL_MSB) {
        pin_map_result = pinmapping[pin >> ADC_INPUTCTRL_MUXPOS_Pos];

        Assert(pin_map_result != PIN_INVALID_ADC_AIN);

        struct system_pinmux_config config;
        system_pinmux_get_config_defaults(&config);

        /* Analog functions are all on MUX setting B */
        config.input_pull   = SYSTEM_PINMUX_PIN_PULL_NONE;
        config.mux_position = 1;

        system_pinmux_pin_set_config(pin_map_result, &config);
    }
}

void analogin_init(analogin_t *obj, PinName pin)
{
    uint32_t pos_input;
    static uint8_t init_flag = 0;

    pos_input = pinmap_find_peripheral(pin, PinMap_ADC);
    MBED_ASSERT(pos_input != NC);

    adc_get_config_defaults(&(obj->config_adc));
    obj->config_adc.positive_input = pos_input;
    if (init_flag == 0) {  // ADC init and enable to be done only once.
        adc_init(&adc_instance, ADC, &(obj->config_adc));
        adc_enable(&adc_instance);
        init_flag = 1;
    } else { // pin muxing
        adc_configure_ain_pin(obj->config_adc.positive_input);
        adc_configure_ain_pin(obj->config_adc.negative_input);
    }
}

uint16_t analogin_read_u16(analogin_t *obj)
{
    uint16_t result;
    adc_set_positive_input(&adc_instance, obj->config_adc.positive_input);
    adc_set_negative_input(&adc_instance, obj->config_adc.negative_input);
    adc_start_conversion(&adc_instance);
    do {
    } while(adc_read(&(adc_instance), &result) == STATUS_BUSY);   // 12 bit value

    return (uint16_t)((result * 65535) / 4095);  // for normalizing to 16 bit value
}

float analogin_read(analogin_t *obj)
{
    uint16_t value = analogin_read_u16(obj);
    return (float)value * (1.0f / (float)0xFFFF);
}