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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

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_KLXX/analogin_api.c@111:ae4891ca7084, 2014-03-06 (annotated)

Committer:
mbed_official
Date:
Thu Mar 06 10:00:06 2014 +0000
Revision:
111:ae4891ca7084
Parent:
82:0b31dbcd4769
Child:
227:7bd0639b8911
Synchronized with git revision 955bd9a5c9e042f1cf30bbae2a99afaab8eb4cbf



Full URL: https://github.com/mbedmicro/mbed/commit/955bd9a5c9e042f1cf30bbae2a99afaab8eb4cbf/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 82:0b31dbcd4769 1 /* mbed Microcontroller Library
mbed_official 82:0b31dbcd4769 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 82:0b31dbcd4769 3 *
mbed_official 82:0b31dbcd4769 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 82:0b31dbcd4769 5 * you may not use this file except in compliance with the License.
mbed_official 82:0b31dbcd4769 6 * You may obtain a copy of the License at
mbed_official 82:0b31dbcd4769 7 *
mbed_official 82:0b31dbcd4769 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 82:0b31dbcd4769 9 *
mbed_official 82:0b31dbcd4769 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 82:0b31dbcd4769 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 82:0b31dbcd4769 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 82:0b31dbcd4769 13 * See the License for the specific language governing permissions and
mbed_official 82:0b31dbcd4769 14 * limitations under the License.
mbed_official 82:0b31dbcd4769 15 */
mbed_official 82:0b31dbcd4769 16 #include "analogin_api.h"
mbed_official 82:0b31dbcd4769 17
mbed_official 82:0b31dbcd4769 18 #include "cmsis.h"
mbed_official 82:0b31dbcd4769 19 #include "pinmap.h"
mbed_official 82:0b31dbcd4769 20 #include "error.h"
mbed_official 82:0b31dbcd4769 21 #include "clk_freqs.h"
mbed_official 82:0b31dbcd4769 22 #include "PeripheralPins.h"
mbed_official 82:0b31dbcd4769 23
mbed_official 82:0b31dbcd4769 24 #define MAX_FADC 6000000
mbed_official 82:0b31dbcd4769 25 #define CHANNELS_A_SHIFT 5
mbed_official 82:0b31dbcd4769 26
mbed_official 82:0b31dbcd4769 27
mbed_official 82:0b31dbcd4769 28 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 82:0b31dbcd4769 29 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 82:0b31dbcd4769 30 if (obj->adc == (ADCName)NC) {
mbed_official 82:0b31dbcd4769 31 error("ADC pin mapping failed");
mbed_official 82:0b31dbcd4769 32 }
mbed_official 82:0b31dbcd4769 33
mbed_official 82:0b31dbcd4769 34 SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
mbed_official 82:0b31dbcd4769 35
mbed_official 82:0b31dbcd4769 36 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
mbed_official 82:0b31dbcd4769 37 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
mbed_official 82:0b31dbcd4769 38
mbed_official 82:0b31dbcd4769 39 uint32_t cfg2_muxsel = ADC_CFG2_MUXSEL_MASK;
mbed_official 82:0b31dbcd4769 40 if (obj->adc & (1 << CHANNELS_A_SHIFT)) {
mbed_official 82:0b31dbcd4769 41 cfg2_muxsel = 0;
mbed_official 82:0b31dbcd4769 42 }
mbed_official 82:0b31dbcd4769 43
mbed_official 82:0b31dbcd4769 44 // bus clk
mbed_official 82:0b31dbcd4769 45 uint32_t PCLK = bus_frequency();
mbed_official 82:0b31dbcd4769 46 uint32_t clkdiv;
mbed_official 82:0b31dbcd4769 47 for (clkdiv = 0; clkdiv < 4; clkdiv++) {
mbed_official 82:0b31dbcd4769 48 if ((PCLK >> clkdiv) <= MAX_FADC)
mbed_official 82:0b31dbcd4769 49 break;
mbed_official 82:0b31dbcd4769 50 }
mbed_official 82:0b31dbcd4769 51 if (clkdiv == 4) //Set max div
mbed_official 82:0b31dbcd4769 52 clkdiv = 0x7;
mbed_official 82:0b31dbcd4769 53
mbed_official 82:0b31dbcd4769 54 ADC0->SC1[1] = ADC_SC1_ADCH(obj->adc & ~(1 << CHANNELS_A_SHIFT));
mbed_official 82:0b31dbcd4769 55
mbed_official 82:0b31dbcd4769 56 ADC0->CFG1 = ADC_CFG1_ADLPC_MASK // Low-Power Configuration
mbed_official 82:0b31dbcd4769 57 | ADC_CFG1_ADIV(clkdiv & 0x3) // Clock Divide Select: (Input Clock)/8
mbed_official 82:0b31dbcd4769 58 | ADC_CFG1_ADLSMP_MASK // Long Sample Time
mbed_official 82:0b31dbcd4769 59 | ADC_CFG1_MODE(3) // (16)bits Resolution
mbed_official 82:0b31dbcd4769 60 | ADC_CFG1_ADICLK(clkdiv >> 2); // Input Clock: (Bus Clock)/2
mbed_official 82:0b31dbcd4769 61
mbed_official 82:0b31dbcd4769 62 ADC0->CFG2 = cfg2_muxsel // ADxxb or ADxxa channels
mbed_official 82:0b31dbcd4769 63 | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable
mbed_official 82:0b31dbcd4769 64 | ADC_CFG2_ADHSC_MASK // High-Speed Configuration
mbed_official 82:0b31dbcd4769 65 | ADC_CFG2_ADLSTS(0); // Long Sample Time Select
mbed_official 82:0b31dbcd4769 66
mbed_official 82:0b31dbcd4769 67 ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference
mbed_official 82:0b31dbcd4769 68
mbed_official 82:0b31dbcd4769 69 ADC0->SC3 = ADC_SC3_AVGE_MASK // Hardware Average Enable
mbed_official 82:0b31dbcd4769 70 | ADC_SC3_AVGS(0); // 4 Samples Averaged
mbed_official 82:0b31dbcd4769 71
mbed_official 82:0b31dbcd4769 72 pinmap_pinout(pin, PinMap_ADC);
mbed_official 82:0b31dbcd4769 73 }
mbed_official 82:0b31dbcd4769 74
mbed_official 82:0b31dbcd4769 75 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 82:0b31dbcd4769 76 // start conversion
mbed_official 82:0b31dbcd4769 77 ADC0->SC1[0] = ADC_SC1_ADCH(obj->adc & ~(1 << CHANNELS_A_SHIFT));
mbed_official 82:0b31dbcd4769 78
mbed_official 82:0b31dbcd4769 79 // Wait Conversion Complete
mbed_official 82:0b31dbcd4769 80 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
mbed_official 82:0b31dbcd4769 81
mbed_official 82:0b31dbcd4769 82 // Return value
mbed_official 82:0b31dbcd4769 83 return (uint16_t)ADC0->R[0];
mbed_official 82:0b31dbcd4769 84 }
mbed_official 82:0b31dbcd4769 85
mbed_official 82:0b31dbcd4769 86 float analogin_read(analogin_t *obj) {
mbed_official 82:0b31dbcd4769 87 uint16_t value = analogin_read_u16(obj);
mbed_official 82:0b31dbcd4769 88 return (float)value * (1.0f / (float)0xFFFF);
mbed_official 82:0b31dbcd4769 89 }
mbed_official 82:0b31dbcd4769 90