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Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_Maxim/TARGET_MAX32625/analogin_api.c@0:098463de4c5d, 2017-01-25 (annotated)

Committer:
group-onsemi
Date:
Wed Jan 25 20:34:15 2017 +0000
Revision:
0:098463de4c5d
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /*******************************************************************************
group-onsemi 0:098463de4c5d 2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Permission is hereby granted, free of charge, to any person obtaining a
group-onsemi 0:098463de4c5d 5 * copy of this software and associated documentation files (the "Software"),
group-onsemi 0:098463de4c5d 6 * to deal in the Software without restriction, including without limitation
group-onsemi 0:098463de4c5d 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
group-onsemi 0:098463de4c5d 8 * and/or sell copies of the Software, and to permit persons to whom the
group-onsemi 0:098463de4c5d 9 * Software is furnished to do so, subject to the following conditions:
group-onsemi 0:098463de4c5d 10 *
group-onsemi 0:098463de4c5d 11 * The above copyright notice and this permission notice shall be included
group-onsemi 0:098463de4c5d 12 * in all copies or substantial portions of the Software.
group-onsemi 0:098463de4c5d 13 *
group-onsemi 0:098463de4c5d 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
group-onsemi 0:098463de4c5d 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
group-onsemi 0:098463de4c5d 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
group-onsemi 0:098463de4c5d 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
group-onsemi 0:098463de4c5d 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
group-onsemi 0:098463de4c5d 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
group-onsemi 0:098463de4c5d 20 * OTHER DEALINGS IN THE SOFTWARE.
group-onsemi 0:098463de4c5d 21 *
group-onsemi 0:098463de4c5d 22 * Except as contained in this notice, the name of Maxim Integrated
group-onsemi 0:098463de4c5d 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
group-onsemi 0:098463de4c5d 24 * Products, Inc. Branding Policy.
group-onsemi 0:098463de4c5d 25 *
group-onsemi 0:098463de4c5d 26 * The mere transfer of this software does not imply any licenses
group-onsemi 0:098463de4c5d 27 * of trade secrets, proprietary technology, copyrights, patents,
group-onsemi 0:098463de4c5d 28 * trademarks, maskwork rights, or any other form of intellectual
group-onsemi 0:098463de4c5d 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
group-onsemi 0:098463de4c5d 30 * ownership rights.
group-onsemi 0:098463de4c5d 31 *******************************************************************************
group-onsemi 0:098463de4c5d 32 */
group-onsemi 0:098463de4c5d 33 #include "mbed_assert.h"
group-onsemi 0:098463de4c5d 34 #include "analogin_api.h"
group-onsemi 0:098463de4c5d 35 #include "adc.h"
group-onsemi 0:098463de4c5d 36 #include "pinmap.h"
group-onsemi 0:098463de4c5d 37 #include "PeripheralPins.h"
group-onsemi 0:098463de4c5d 38
group-onsemi 0:098463de4c5d 39 #define ADC_FULL_SCALE 0x3FFU
group-onsemi 0:098463de4c5d 40 #define INT_FULL_SCALE 0xFFFFU
group-onsemi 0:098463de4c5d 41 #define FLOAT_FULL_SCALE 1.0f
group-onsemi 0:098463de4c5d 42
group-onsemi 0:098463de4c5d 43 static int initialized = 0;
group-onsemi 0:098463de4c5d 44
group-onsemi 0:098463de4c5d 45 //******************************************************************************
group-onsemi 0:098463de4c5d 46 void analogin_init(analogin_t *obj, PinName pin)
group-onsemi 0:098463de4c5d 47 {
group-onsemi 0:098463de4c5d 48 // Make sure pin is an analog pin we can use for ADC
group-onsemi 0:098463de4c5d 49 MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC);
group-onsemi 0:098463de4c5d 50
group-onsemi 0:098463de4c5d 51 // Set the object pointer and channel encoding
group-onsemi 0:098463de4c5d 52 obj->adc = MXC_ADC;
group-onsemi 0:098463de4c5d 53 obj->channel = pinmap_find_function(pin, PinMap_ADC);
group-onsemi 0:098463de4c5d 54
group-onsemi 0:098463de4c5d 55 if (!initialized) {
group-onsemi 0:098463de4c5d 56 MBED_ASSERT(ADC_Init() == E_NO_ERROR);
group-onsemi 0:098463de4c5d 57 initialized = 1;
group-onsemi 0:098463de4c5d 58 }
group-onsemi 0:098463de4c5d 59 }
group-onsemi 0:098463de4c5d 60
group-onsemi 0:098463de4c5d 61 //******************************************************************************
group-onsemi 0:098463de4c5d 62 float analogin_read(analogin_t *obj)
group-onsemi 0:098463de4c5d 63 {
group-onsemi 0:098463de4c5d 64 uint16_t tmp;
group-onsemi 0:098463de4c5d 65 float result;
group-onsemi 0:098463de4c5d 66
group-onsemi 0:098463de4c5d 67 // Start conversion with no input scaling and no input buffer bypass
group-onsemi 0:098463de4c5d 68 ADC_StartConvert(obj->channel, 0, 0);
group-onsemi 0:098463de4c5d 69
group-onsemi 0:098463de4c5d 70 if (ADC_GetData(&tmp) == E_OVERFLOW) {
group-onsemi 0:098463de4c5d 71 result = FLOAT_FULL_SCALE;
group-onsemi 0:098463de4c5d 72 } else {
group-onsemi 0:098463de4c5d 73 result = (float)tmp * (FLOAT_FULL_SCALE / (float)ADC_FULL_SCALE);
group-onsemi 0:098463de4c5d 74 }
group-onsemi 0:098463de4c5d 75
group-onsemi 0:098463de4c5d 76 return result;
group-onsemi 0:098463de4c5d 77 }
group-onsemi 0:098463de4c5d 78
group-onsemi 0:098463de4c5d 79 //******************************************************************************
group-onsemi 0:098463de4c5d 80 uint16_t analogin_read_u16(analogin_t *obj)
group-onsemi 0:098463de4c5d 81 {
group-onsemi 0:098463de4c5d 82 uint16_t tmp;
group-onsemi 0:098463de4c5d 83 uint16_t result;
group-onsemi 0:098463de4c5d 84
group-onsemi 0:098463de4c5d 85 // Start conversion with no input scaling and no input buffer bypass
group-onsemi 0:098463de4c5d 86 ADC_StartConvert(obj->channel, 0, 0);
group-onsemi 0:098463de4c5d 87
group-onsemi 0:098463de4c5d 88 if (ADC_GetData(&tmp) == E_OVERFLOW) {
group-onsemi 0:098463de4c5d 89 result = INT_FULL_SCALE;
group-onsemi 0:098463de4c5d 90 } else {
group-onsemi 0:098463de4c5d 91 result = ((tmp << 6) & 0xFFC0) | ((tmp >> 4) & 0x003F);
group-onsemi 0:098463de4c5d 92 }
group-onsemi 0:098463de4c5d 93
group-onsemi 0:098463de4c5d 94 return result;
group-onsemi 0:098463de4c5d 95 }
group-onsemi 0:098463de4c5d 96