Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/TARGET_Maxim/TARGET_MAX32630/analogin_api.c@165:2dd56e6daeec, 2017-05-23 (annotated)

Committer:
ranaumarnaeem
Date:
Tue May 23 12:54:50 2017 +0000
Revision:
165:2dd56e6daeec
Parent:
157:ff67d9f36b67 
jhjg

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 157:ff67d9f36b67 1 /*******************************************************************************
<> 157:ff67d9f36b67 2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
<> 157:ff67d9f36b67 3 *
<> 157:ff67d9f36b67 4 * Permission is hereby granted, free of charge, to any person obtaining a
<> 157:ff67d9f36b67 5 * copy of this software and associated documentation files (the "Software"),
<> 157:ff67d9f36b67 6 * to deal in the Software without restriction, including without limitation
<> 157:ff67d9f36b67 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
<> 157:ff67d9f36b67 8 * and/or sell copies of the Software, and to permit persons to whom the
<> 157:ff67d9f36b67 9 * Software is furnished to do so, subject to the following conditions:
<> 157:ff67d9f36b67 10 *
<> 157:ff67d9f36b67 11 * The above copyright notice and this permission notice shall be included
<> 157:ff67d9f36b67 12 * in all copies or substantial portions of the Software.
<> 157:ff67d9f36b67 13 *
<> 157:ff67d9f36b67 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
<> 157:ff67d9f36b67 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
<> 157:ff67d9f36b67 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
<> 157:ff67d9f36b67 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
<> 157:ff67d9f36b67 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
<> 157:ff67d9f36b67 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
<> 157:ff67d9f36b67 20 * OTHER DEALINGS IN THE SOFTWARE.
<> 157:ff67d9f36b67 21 *
<> 157:ff67d9f36b67 22 * Except as contained in this notice, the name of Maxim Integrated
<> 157:ff67d9f36b67 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
<> 157:ff67d9f36b67 24 * Products, Inc. Branding Policy.
<> 157:ff67d9f36b67 25 *
<> 157:ff67d9f36b67 26 * The mere transfer of this software does not imply any licenses
<> 157:ff67d9f36b67 27 * of trade secrets, proprietary technology, copyrights, patents,
<> 157:ff67d9f36b67 28 * trademarks, maskwork rights, or any other form of intellectual
<> 157:ff67d9f36b67 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
<> 157:ff67d9f36b67 30 * ownership rights.
<> 157:ff67d9f36b67 31 *******************************************************************************
<> 157:ff67d9f36b67 32 */
<> 157:ff67d9f36b67 33 #include "mbed_assert.h"
<> 157:ff67d9f36b67 34 #include "analogin_api.h"
<> 157:ff67d9f36b67 35 #include "adc.h"
<> 157:ff67d9f36b67 36 #include "pinmap.h"
<> 157:ff67d9f36b67 37 #include "PeripheralPins.h"
<> 157:ff67d9f36b67 38
<> 157:ff67d9f36b67 39 #define ADC_FULL_SCALE 0x3FFU
<> 157:ff67d9f36b67 40 #define INT_FULL_SCALE 0xFFFFU
<> 157:ff67d9f36b67 41 #define FLOAT_FULL_SCALE 1.0f
<> 157:ff67d9f36b67 42
<> 157:ff67d9f36b67 43 static int initialized = 0;
<> 157:ff67d9f36b67 44
<> 157:ff67d9f36b67 45 //******************************************************************************
<> 157:ff67d9f36b67 46 void analogin_init(analogin_t *obj, PinName pin)
<> 157:ff67d9f36b67 47 {
<> 157:ff67d9f36b67 48 // Make sure pin is an analog pin we can use for ADC
<> 157:ff67d9f36b67 49 MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC);
<> 157:ff67d9f36b67 50
<> 157:ff67d9f36b67 51 // Set the object pointer and channel encoding
<> 157:ff67d9f36b67 52 obj->adc = MXC_ADC;
<> 157:ff67d9f36b67 53 obj->channel = pinmap_find_function(pin, PinMap_ADC);
<> 157:ff67d9f36b67 54
<> 157:ff67d9f36b67 55 if (!initialized) {
<> 157:ff67d9f36b67 56 MBED_ASSERT(ADC_Init() == E_NO_ERROR);
<> 157:ff67d9f36b67 57 initialized = 1;
<> 157:ff67d9f36b67 58 }
<> 157:ff67d9f36b67 59 }
<> 157:ff67d9f36b67 60
<> 157:ff67d9f36b67 61 //******************************************************************************
<> 157:ff67d9f36b67 62 float analogin_read(analogin_t *obj)
<> 157:ff67d9f36b67 63 {
<> 157:ff67d9f36b67 64 uint16_t tmp;
<> 157:ff67d9f36b67 65 float result;
<> 157:ff67d9f36b67 66
<> 157:ff67d9f36b67 67 // Start conversion with no input scaling and no input buffer bypass
<> 157:ff67d9f36b67 68 ADC_StartConvert(obj->channel, 1, 0);
<> 157:ff67d9f36b67 69
<> 157:ff67d9f36b67 70 if (ADC_GetData(&tmp) == E_OVERFLOW) {
<> 157:ff67d9f36b67 71 result = FLOAT_FULL_SCALE;
<> 157:ff67d9f36b67 72 } else {
<> 157:ff67d9f36b67 73 result = (float)tmp * (FLOAT_FULL_SCALE / (float)ADC_FULL_SCALE);
<> 157:ff67d9f36b67 74 }
<> 157:ff67d9f36b67 75
<> 157:ff67d9f36b67 76 return result;
<> 157:ff67d9f36b67 77 }
<> 157:ff67d9f36b67 78
<> 157:ff67d9f36b67 79 //******************************************************************************
<> 157:ff67d9f36b67 80 uint16_t analogin_read_u16(analogin_t *obj)
<> 157:ff67d9f36b67 81 {
<> 157:ff67d9f36b67 82 uint16_t tmp;
<> 157:ff67d9f36b67 83 uint16_t result;
<> 157:ff67d9f36b67 84
<> 157:ff67d9f36b67 85 // Start conversion with no input scaling and no input buffer bypass
<> 157:ff67d9f36b67 86 ADC_StartConvert(obj->channel, 1, 0);
<> 157:ff67d9f36b67 87
<> 157:ff67d9f36b67 88 if (ADC_GetData(&tmp) == E_OVERFLOW) {
<> 157:ff67d9f36b67 89 result = INT_FULL_SCALE;
<> 157:ff67d9f36b67 90 } else {
<> 157:ff67d9f36b67 91 result = ((tmp << 6) & 0xFFC0) | ((tmp >> 4) & 0x003F);
<> 157:ff67d9f36b67 92 }
<> 157:ff67d9f36b67 93
<> 157:ff67d9f36b67 94 return result;
<> 157:ff67d9f36b67 95 }
<> 157:ff67d9f36b67 96