Elijah Stanger-Jones / mbed-dev-f303

test

targets/TARGET_Maxim/TARGET_MAX32630/analogin_api.c@2:4364577b5ad8, 2020-11-09 (annotated)

Committer:
elijahsj
Date:
Mon Nov 09 00:33:19 2020 -0500
Revision:
2:4364577b5ad8
Parent:
1:8a094db1347f 
copied mbed library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elijahsj 1:8a094db1347f 1 /*******************************************************************************
elijahsj 1:8a094db1347f 2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
elijahsj 1:8a094db1347f 3 *
elijahsj 1:8a094db1347f 4 * Permission is hereby granted, free of charge, to any person obtaining a
elijahsj 1:8a094db1347f 5 * copy of this software and associated documentation files (the "Software"),
elijahsj 1:8a094db1347f 6 * to deal in the Software without restriction, including without limitation
elijahsj 1:8a094db1347f 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
elijahsj 1:8a094db1347f 8 * and/or sell copies of the Software, and to permit persons to whom the
elijahsj 1:8a094db1347f 9 * Software is furnished to do so, subject to the following conditions:
elijahsj 1:8a094db1347f 10 *
elijahsj 1:8a094db1347f 11 * The above copyright notice and this permission notice shall be included
elijahsj 1:8a094db1347f 12 * in all copies or substantial portions of the Software.
elijahsj 1:8a094db1347f 13 *
elijahsj 1:8a094db1347f 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
elijahsj 1:8a094db1347f 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
elijahsj 1:8a094db1347f 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
elijahsj 1:8a094db1347f 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
elijahsj 1:8a094db1347f 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
elijahsj 1:8a094db1347f 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
elijahsj 1:8a094db1347f 20 * OTHER DEALINGS IN THE SOFTWARE.
elijahsj 1:8a094db1347f 21 *
elijahsj 1:8a094db1347f 22 * Except as contained in this notice, the name of Maxim Integrated
elijahsj 1:8a094db1347f 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
elijahsj 1:8a094db1347f 24 * Products, Inc. Branding Policy.
elijahsj 1:8a094db1347f 25 *
elijahsj 1:8a094db1347f 26 * The mere transfer of this software does not imply any licenses
elijahsj 1:8a094db1347f 27 * of trade secrets, proprietary technology, copyrights, patents,
elijahsj 1:8a094db1347f 28 * trademarks, maskwork rights, or any other form of intellectual
elijahsj 1:8a094db1347f 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
elijahsj 1:8a094db1347f 30 * ownership rights.
elijahsj 1:8a094db1347f 31 *******************************************************************************
elijahsj 1:8a094db1347f 32 */
elijahsj 1:8a094db1347f 33 #include "mbed_assert.h"
elijahsj 1:8a094db1347f 34 #include "analogin_api.h"
elijahsj 1:8a094db1347f 35 #include "adc.h"
elijahsj 1:8a094db1347f 36 #include "pinmap.h"
elijahsj 1:8a094db1347f 37 #include "PeripheralPins.h"
elijahsj 1:8a094db1347f 38
elijahsj 1:8a094db1347f 39 #define ADC_FULL_SCALE 0x3FFU
elijahsj 1:8a094db1347f 40 #define INT_FULL_SCALE 0xFFFFU
elijahsj 1:8a094db1347f 41 #define FLOAT_FULL_SCALE 1.0f
elijahsj 1:8a094db1347f 42
elijahsj 1:8a094db1347f 43 static int initialized = 0;
elijahsj 1:8a094db1347f 44
elijahsj 1:8a094db1347f 45 //******************************************************************************
elijahsj 1:8a094db1347f 46 void analogin_init(analogin_t *obj, PinName pin)
elijahsj 1:8a094db1347f 47 {
elijahsj 1:8a094db1347f 48 // Make sure pin is an analog pin we can use for ADC
elijahsj 1:8a094db1347f 49 MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC);
elijahsj 1:8a094db1347f 50
elijahsj 1:8a094db1347f 51 // Set the object pointer and channel encoding
elijahsj 1:8a094db1347f 52 obj->adc = MXC_ADC;
elijahsj 1:8a094db1347f 53 obj->channel = pinmap_find_function(pin, PinMap_ADC);
elijahsj 1:8a094db1347f 54
elijahsj 1:8a094db1347f 55 if (!initialized) {
elijahsj 1:8a094db1347f 56 MBED_ASSERT(ADC_Init() == E_NO_ERROR);
elijahsj 1:8a094db1347f 57 initialized = 1;
elijahsj 1:8a094db1347f 58 }
elijahsj 1:8a094db1347f 59 }
elijahsj 1:8a094db1347f 60
elijahsj 1:8a094db1347f 61 //******************************************************************************
elijahsj 1:8a094db1347f 62 float analogin_read(analogin_t *obj)
elijahsj 1:8a094db1347f 63 {
elijahsj 1:8a094db1347f 64 uint16_t tmp;
elijahsj 1:8a094db1347f 65 float result;
elijahsj 1:8a094db1347f 66
elijahsj 1:8a094db1347f 67 // Start conversion with no input scaling and no input buffer bypass
elijahsj 1:8a094db1347f 68 ADC_StartConvert(obj->channel, 1, 0);
elijahsj 1:8a094db1347f 69
elijahsj 1:8a094db1347f 70 if (ADC_GetData(&tmp) == E_OVERFLOW) {
elijahsj 1:8a094db1347f 71 result = FLOAT_FULL_SCALE;
elijahsj 1:8a094db1347f 72 } else {
elijahsj 1:8a094db1347f 73 result = (float)tmp * (FLOAT_FULL_SCALE / (float)ADC_FULL_SCALE);
elijahsj 1:8a094db1347f 74 }
elijahsj 1:8a094db1347f 75
elijahsj 1:8a094db1347f 76 return result;
elijahsj 1:8a094db1347f 77 }
elijahsj 1:8a094db1347f 78
elijahsj 1:8a094db1347f 79 //******************************************************************************
elijahsj 1:8a094db1347f 80 uint16_t analogin_read_u16(analogin_t *obj)
elijahsj 1:8a094db1347f 81 {
elijahsj 1:8a094db1347f 82 uint16_t tmp;
elijahsj 1:8a094db1347f 83 uint16_t result;
elijahsj 1:8a094db1347f 84
elijahsj 1:8a094db1347f 85 // Start conversion with no input scaling and no input buffer bypass
elijahsj 1:8a094db1347f 86 ADC_StartConvert(obj->channel, 1, 0);
elijahsj 1:8a094db1347f 87
elijahsj 1:8a094db1347f 88 if (ADC_GetData(&tmp) == E_OVERFLOW) {
elijahsj 1:8a094db1347f 89 result = INT_FULL_SCALE;
elijahsj 1:8a094db1347f 90 } else {
elijahsj 1:8a094db1347f 91 result = ((tmp << 6) & 0xFFC0) | ((tmp >> 4) & 0x003F);
elijahsj 1:8a094db1347f 92 }
elijahsj 1:8a094db1347f 93
elijahsj 1:8a094db1347f 94 return result;
elijahsj 1:8a094db1347f 95 }
elijahsj 1:8a094db1347f 96