Marlon Fulla / Mbed 2 deprecated 2014FEB04_Vibrometro_Xbee

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Dependencies:   mbed

Fork of 2014FEB4_Vibrometro_Xbee by Marlon Fulla

analogin_api.c@9:db5c39c8cf42, 2014-01-28 (annotated)

Committer:
jlpalaci
Date:
Tue Jan 28 00:10:05 2014 +0000
Revision:
9:db5c39c8cf42
Parent:
6:99df19f0f6eb 
Version final en base de funcines de C para la lectura/escritura de meorias SD.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jlpalaci 6:99df19f0f6eb 1 /* mbed Microcontroller Library
jlpalaci 6:99df19f0f6eb 2 * Copyright (c) 2006-2013 ARM Limited
jlpalaci 6:99df19f0f6eb 3 *
jlpalaci 6:99df19f0f6eb 4 * Licensed under the Apache License, Version 2.0 (the "License");
jlpalaci 6:99df19f0f6eb 5 * you may not use this file except in compliance with the License.
jlpalaci 6:99df19f0f6eb 6 * You may obtain a copy of the License at
jlpalaci 6:99df19f0f6eb 7 *
jlpalaci 6:99df19f0f6eb 8 * http://www.apache.org/licenses/LICENSE-2.0
jlpalaci 6:99df19f0f6eb 9 *
jlpalaci 6:99df19f0f6eb 10 * Unless required by applicable law or agreed to in writing, software
jlpalaci 6:99df19f0f6eb 11 * distributed under the License is distributed on an "AS IS" BASIS,
jlpalaci 6:99df19f0f6eb 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
jlpalaci 6:99df19f0f6eb 13 * See the License for the specific language governing permissions and
jlpalaci 6:99df19f0f6eb 14 * limitations under the License.
jlpalaci 6:99df19f0f6eb 15 */
jlpalaci 6:99df19f0f6eb 16 #include "analogin_api.h"
jlpalaci 6:99df19f0f6eb 17
jlpalaci 6:99df19f0f6eb 18 #include "cmsis.h"
jlpalaci 6:99df19f0f6eb 19 #include "pinmap.h"
jlpalaci 6:99df19f0f6eb 20 #include "error.h"
jlpalaci 6:99df19f0f6eb 21
jlpalaci 6:99df19f0f6eb 22 static const PinMap PinMap_ADC[] = {
jlpalaci 6:99df19f0f6eb 23 {PTE20, ADC0_SE0, 0},
jlpalaci 6:99df19f0f6eb 24 {PTE22, ADC0_SE3, 0},
jlpalaci 6:99df19f0f6eb 25 {PTE29, ADC0_SE4b, 0},
jlpalaci 6:99df19f0f6eb 26 {PTE30, ADC0_SE23, 0},
jlpalaci 6:99df19f0f6eb 27 {PTB0, ADC0_SE8, 0},
jlpalaci 6:99df19f0f6eb 28 {PTB1, ADC0_SE9, 0},
jlpalaci 6:99df19f0f6eb 29 {PTB2, ADC0_SE12, 0},
jlpalaci 6:99df19f0f6eb 30 {PTB3, ADC0_SE13, 0},
jlpalaci 6:99df19f0f6eb 31 {PTC0, ADC0_SE14, 0},
jlpalaci 6:99df19f0f6eb 32 {PTC1, ADC0_SE15, 0},
jlpalaci 6:99df19f0f6eb 33 {PTC2, ADC0_SE11, 0},
jlpalaci 6:99df19f0f6eb 34 {PTD1, ADC0_SE5b, 0},
jlpalaci 6:99df19f0f6eb 35 {PTD5, ADC0_SE6b, 0},
jlpalaci 6:99df19f0f6eb 36 {PTD6, ADC0_SE7b, 0},
jlpalaci 6:99df19f0f6eb 37 {NC, NC, 0}
jlpalaci 6:99df19f0f6eb 38 };
jlpalaci 6:99df19f0f6eb 39
jlpalaci 6:99df19f0f6eb 40 void analogin_init(analogin_t *obj, PinName pin) {
jlpalaci 6:99df19f0f6eb 41 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
jlpalaci 6:99df19f0f6eb 42 if (obj->adc == (uint32_t)NC) {
jlpalaci 6:99df19f0f6eb 43 error("ADC pin mapping failed");
jlpalaci 6:99df19f0f6eb 44 }
jlpalaci 6:99df19f0f6eb 45
jlpalaci 6:99df19f0f6eb 46 SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
jlpalaci 6:99df19f0f6eb 47
jlpalaci 6:99df19f0f6eb 48 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
jlpalaci 6:99df19f0f6eb 49 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
jlpalaci 6:99df19f0f6eb 50
jlpalaci 6:99df19f0f6eb 51 ADC0->SC1[1] = ADC_SC1_ADCH(obj->adc);
jlpalaci 6:99df19f0f6eb 52
jlpalaci 6:99df19f0f6eb 53 ADC0->CFG1 = ADC_CFG1_ADIV(0) // Clock Divide Select: (Input Clock)
jlpalaci 6:99df19f0f6eb 54 | ADC_CFG1_ADLSMP_MASK // Long Sample Time
jlpalaci 6:99df19f0f6eb 55 | ADC_CFG1_MODE(3) // (16)bits Resolution
jlpalaci 6:99df19f0f6eb 56 | ADC_CFG1_ADICLK(0); // Input Clock: (Bus Clock)
jlpalaci 6:99df19f0f6eb 57
jlpalaci 6:99df19f0f6eb 58 ADC0->CFG2 = ADC_CFG2_MUXSEL_MASK // ADxxb channels are selected
jlpalaci 6:99df19f0f6eb 59 | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable
jlpalaci 6:99df19f0f6eb 60 | ADC_CFG2_ADHSC_MASK // High-Speed Configuration
jlpalaci 6:99df19f0f6eb 61 | ADC_CFG2_ADLSTS(3); // Short Sample Time Select
jlpalaci 6:99df19f0f6eb 62
jlpalaci 6:99df19f0f6eb 63 ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference
jlpalaci 6:99df19f0f6eb 64
jlpalaci 6:99df19f0f6eb 65 pinmap_pinout(pin, PinMap_ADC);
jlpalaci 6:99df19f0f6eb 66 }
jlpalaci 6:99df19f0f6eb 67
jlpalaci 6:99df19f0f6eb 68 uint16_t analogin_read_u16(analogin_t *obj) {
jlpalaci 6:99df19f0f6eb 69 // start conversion
jlpalaci 6:99df19f0f6eb 70 ADC0->SC1[0] = ADC_SC1_ADCH(obj->adc);
jlpalaci 6:99df19f0f6eb 71
jlpalaci 6:99df19f0f6eb 72 // Wait Conversion Complete
jlpalaci 6:99df19f0f6eb 73 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
jlpalaci 6:99df19f0f6eb 74
jlpalaci 6:99df19f0f6eb 75 // Return value
jlpalaci 6:99df19f0f6eb 76 return (uint16_t)ADC0->R[0];
jlpalaci 6:99df19f0f6eb 77 }
jlpalaci 6:99df19f0f6eb 78
jlpalaci 6:99df19f0f6eb 79 float analogin_read(analogin_t *obj) {
jlpalaci 6:99df19f0f6eb 80 uint16_t value = analogin_read_u16(obj);
jlpalaci 6:99df19f0f6eb 81 return (float)value * (1.0f / (float)0xFFFF);
jlpalaci 6:99df19f0f6eb 82 }
jlpalaci 6:99df19f0f6eb 83