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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
82:0b31dbcd4769
Child:
499:d0e9408fd176
Synchronized with git revision d58d532ebc0e0a96f4fffb8edefc082b71b964af



Full URL: https://github.com/mbedmicro/mbed/commit/d58d532ebc0e0a96f4fffb8edefc082b71b964af/

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 227:7bd0639b8911 16 #include "mbed_assert.h"
mbed_official 82:0b31dbcd4769 17 #include "analogin_api.h"
mbed_official 82:0b31dbcd4769 18
mbed_official 82:0b31dbcd4769 19 #include "cmsis.h"
mbed_official 82:0b31dbcd4769 20 #include "pinmap.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 227:7bd0639b8911 30 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 82:0b31dbcd4769 31
mbed_official 82:0b31dbcd4769 32 SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
mbed_official 82:0b31dbcd4769 33
mbed_official 82:0b31dbcd4769 34 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
mbed_official 82:0b31dbcd4769 35 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
mbed_official 82:0b31dbcd4769 36
mbed_official 82:0b31dbcd4769 37 uint32_t cfg2_muxsel = ADC_CFG2_MUXSEL_MASK;
mbed_official 82:0b31dbcd4769 38 if (obj->adc & (1 << CHANNELS_A_SHIFT)) {
mbed_official 82:0b31dbcd4769 39 cfg2_muxsel = 0;
mbed_official 82:0b31dbcd4769 40 }
mbed_official 82:0b31dbcd4769 41
mbed_official 82:0b31dbcd4769 42 // bus clk
mbed_official 82:0b31dbcd4769 43 uint32_t PCLK = bus_frequency();
mbed_official 82:0b31dbcd4769 44 uint32_t clkdiv;
mbed_official 82:0b31dbcd4769 45 for (clkdiv = 0; clkdiv < 4; clkdiv++) {
mbed_official 82:0b31dbcd4769 46 if ((PCLK >> clkdiv) <= MAX_FADC)
mbed_official 82:0b31dbcd4769 47 break;
mbed_official 82:0b31dbcd4769 48 }
mbed_official 82:0b31dbcd4769 49 if (clkdiv == 4) //Set max div
mbed_official 82:0b31dbcd4769 50 clkdiv = 0x7;
mbed_official 82:0b31dbcd4769 51
mbed_official 82:0b31dbcd4769 52 ADC0->SC1[1] = ADC_SC1_ADCH(obj->adc & ~(1 << CHANNELS_A_SHIFT));
mbed_official 82:0b31dbcd4769 53
mbed_official 82:0b31dbcd4769 54 ADC0->CFG1 = ADC_CFG1_ADLPC_MASK // Low-Power Configuration
mbed_official 82:0b31dbcd4769 55 | ADC_CFG1_ADIV(clkdiv & 0x3) // Clock Divide Select: (Input Clock)/8
mbed_official 82:0b31dbcd4769 56 | ADC_CFG1_ADLSMP_MASK // Long Sample Time
mbed_official 82:0b31dbcd4769 57 | ADC_CFG1_MODE(3) // (16)bits Resolution
mbed_official 82:0b31dbcd4769 58 | ADC_CFG1_ADICLK(clkdiv >> 2); // Input Clock: (Bus Clock)/2
mbed_official 82:0b31dbcd4769 59
mbed_official 82:0b31dbcd4769 60 ADC0->CFG2 = cfg2_muxsel // ADxxb or ADxxa channels
mbed_official 82:0b31dbcd4769 61 | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable
mbed_official 82:0b31dbcd4769 62 | ADC_CFG2_ADHSC_MASK // High-Speed Configuration
mbed_official 82:0b31dbcd4769 63 | ADC_CFG2_ADLSTS(0); // Long Sample Time Select
mbed_official 82:0b31dbcd4769 64
mbed_official 82:0b31dbcd4769 65 ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference
mbed_official 82:0b31dbcd4769 66
mbed_official 82:0b31dbcd4769 67 ADC0->SC3 = ADC_SC3_AVGE_MASK // Hardware Average Enable
mbed_official 82:0b31dbcd4769 68 | ADC_SC3_AVGS(0); // 4 Samples Averaged
mbed_official 82:0b31dbcd4769 69
mbed_official 82:0b31dbcd4769 70 pinmap_pinout(pin, PinMap_ADC);
mbed_official 82:0b31dbcd4769 71 }
mbed_official 82:0b31dbcd4769 72
mbed_official 82:0b31dbcd4769 73 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 82:0b31dbcd4769 74 // start conversion
mbed_official 82:0b31dbcd4769 75 ADC0->SC1[0] = ADC_SC1_ADCH(obj->adc & ~(1 << CHANNELS_A_SHIFT));
mbed_official 82:0b31dbcd4769 76
mbed_official 82:0b31dbcd4769 77 // Wait Conversion Complete
mbed_official 82:0b31dbcd4769 78 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
mbed_official 82:0b31dbcd4769 79
mbed_official 82:0b31dbcd4769 80 // Return value
mbed_official 82:0b31dbcd4769 81 return (uint16_t)ADC0->R[0];
mbed_official 82:0b31dbcd4769 82 }
mbed_official 82:0b31dbcd4769 83
mbed_official 82:0b31dbcd4769 84 float analogin_read(analogin_t *obj) {
mbed_official 82:0b31dbcd4769 85 uint16_t value = analogin_read_u16(obj);
mbed_official 82:0b31dbcd4769 86 return (float)value * (1.0f / (float)0xFFFF);
mbed_official 82:0b31dbcd4769 87 }
mbed_official 82:0b31dbcd4769 88