SDK Development / mbed-src

mbed SDK library sources

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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 librarymbed

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

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_Freescale/TARGET_K20D5M/analogin_api.c@68:41613245dfd7, 2013-12-26 (annotated)

Committer:
mbed_official
Date:
Thu Dec 26 13:00:06 2013 +0000
Revision:
68:41613245dfd7
Child:
73:299c67215126
Synchronized with git revision fba199a9c4445231b0f38e1e113c118182635546



Full URL: https://github.com/mbedmicro/mbed/commit/fba199a9c4445231b0f38e1e113c118182635546/



target K20D5M

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 68:41613245dfd7 1 /* mbed Microcontroller Library
mbed_official 68:41613245dfd7 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 68:41613245dfd7 3 *
mbed_official 68:41613245dfd7 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 68:41613245dfd7 5 * you may not use this file except in compliance with the License.
mbed_official 68:41613245dfd7 6 * You may obtain a copy of the License at
mbed_official 68:41613245dfd7 7 *
mbed_official 68:41613245dfd7 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 68:41613245dfd7 9 *
mbed_official 68:41613245dfd7 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 68:41613245dfd7 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 68:41613245dfd7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 68:41613245dfd7 13 * See the License for the specific language governing permissions and
mbed_official 68:41613245dfd7 14 * limitations under the License.
mbed_official 68:41613245dfd7 15 */
mbed_official 68:41613245dfd7 16 #include "analogin_api.h"
mbed_official 68:41613245dfd7 17
mbed_official 68:41613245dfd7 18 #include "cmsis.h"
mbed_official 68:41613245dfd7 19 #include "pinmap.h"
mbed_official 68:41613245dfd7 20 #include "error.h"
mbed_official 68:41613245dfd7 21
mbed_official 68:41613245dfd7 22 static const PinMap PinMap_ADC[] = {
mbed_official 68:41613245dfd7 23 {PTC2, ADC0_SE4b, 0},
mbed_official 68:41613245dfd7 24 {PTD1, ADC0_SE5b, 0},
mbed_official 68:41613245dfd7 25 {PTD5, ADC0_SE6b, 0},
mbed_official 68:41613245dfd7 26 {PTD6, ADC0_SE7b, 0},
mbed_official 68:41613245dfd7 27 {PTB0, ADC0_SE8, 0},
mbed_official 68:41613245dfd7 28 {PTB1, ADC0_SE9, 0},
mbed_official 68:41613245dfd7 29 {PTB2, ADC0_SE12, 0},
mbed_official 68:41613245dfd7 30 {PTB3, ADC0_SE13, 0},
mbed_official 68:41613245dfd7 31 {PTC0, ADC0_SE14, 0},
mbed_official 68:41613245dfd7 32 {PTC1, ADC0_SE15, 0},
mbed_official 68:41613245dfd7 33 {NC, NC, 0}
mbed_official 68:41613245dfd7 34 };
mbed_official 68:41613245dfd7 35
mbed_official 68:41613245dfd7 36 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 68:41613245dfd7 37 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 68:41613245dfd7 38 if (obj->adc == (ADCName)NC)
mbed_official 68:41613245dfd7 39 error("ADC pin mapping failed");
mbed_official 68:41613245dfd7 40
mbed_official 68:41613245dfd7 41 SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
mbed_official 68:41613245dfd7 42
mbed_official 68:41613245dfd7 43 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
mbed_official 68:41613245dfd7 44 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
mbed_official 68:41613245dfd7 45
mbed_official 68:41613245dfd7 46 ADC0->SC1[1] = ADC_SC1_ADCH(obj->adc);
mbed_official 68:41613245dfd7 47
mbed_official 68:41613245dfd7 48 ADC0->CFG1 = ADC_CFG1_ADLPC_MASK // Low-Power Configuration
mbed_official 68:41613245dfd7 49 | ADC_CFG1_ADIV(3) // Clock Divide Select: (Input Clock)/8
mbed_official 68:41613245dfd7 50 | ADC_CFG1_ADLSMP_MASK // Long Sample Time
mbed_official 68:41613245dfd7 51 | ADC_CFG1_MODE(3) // (16)bits Resolution
mbed_official 68:41613245dfd7 52 | ADC_CFG1_ADICLK(1); // Input Clock: (Bus Clock)/2
mbed_official 68:41613245dfd7 53
mbed_official 68:41613245dfd7 54 ADC0->CFG2 = ADC_CFG2_MUXSEL_MASK // ADxxb or ADxxa channels
mbed_official 68:41613245dfd7 55 | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable
mbed_official 68:41613245dfd7 56 | ADC_CFG2_ADHSC_MASK // High-Speed Configuration
mbed_official 68:41613245dfd7 57 | ADC_CFG2_ADLSTS(0); // Long Sample Time Select
mbed_official 68:41613245dfd7 58
mbed_official 68:41613245dfd7 59 ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference
mbed_official 68:41613245dfd7 60
mbed_official 68:41613245dfd7 61 ADC0->SC3 = ADC_SC3_AVGE_MASK // Hardware Average Enable
mbed_official 68:41613245dfd7 62 | ADC_SC3_AVGS(0); // 4 Samples Averaged
mbed_official 68:41613245dfd7 63
mbed_official 68:41613245dfd7 64 pinmap_pinout(pin, PinMap_ADC);
mbed_official 68:41613245dfd7 65 }
mbed_official 68:41613245dfd7 66
mbed_official 68:41613245dfd7 67 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 68:41613245dfd7 68 // start conversion
mbed_official 68:41613245dfd7 69 ADC0->SC1[0] = ADC_SC1_ADCH(obj->adc);
mbed_official 68:41613245dfd7 70
mbed_official 68:41613245dfd7 71 // Wait Conversion Complete
mbed_official 68:41613245dfd7 72 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
mbed_official 68:41613245dfd7 73
mbed_official 68:41613245dfd7 74 return (uint16_t)ADC0->R[0];
mbed_official 68:41613245dfd7 75 }
mbed_official 68:41613245dfd7 76
mbed_official 68:41613245dfd7 77 float analogin_read(analogin_t *obj) {
mbed_official 68:41613245dfd7 78 uint16_t value = analogin_read_u16(obj);
mbed_official 68:41613245dfd7 79 return (float)value * (1.0f / (float)0xFFFF);
mbed_official 68:41613245dfd7 80 }
mbed_official 68:41613245dfd7 81