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Dependents:   MX106-finaltest

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targets/hal/TARGET_Freescale/TARGET_K20XX/analogin_api.c@636:2405a6d45c2c, 2016-05-23 (annotated)

Committer:
dconsoli
Date:
Mon May 23 02:17:28 2016 +0000
Revision:
636:2405a6d45c2c
Parent:
499:d0e9408fd176 
I don't know;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 445:3312ed629f01 1 /* mbed Microcontroller Library
mbed_official 445:3312ed629f01 2 * Copyright (c) 2006-2015 ARM Limited
mbed_official 445:3312ed629f01 3 *
mbed_official 445:3312ed629f01 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 445:3312ed629f01 5 * you may not use this file except in compliance with the License.
mbed_official 445:3312ed629f01 6 * You may obtain a copy of the License at
mbed_official 445:3312ed629f01 7 *
mbed_official 445:3312ed629f01 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 445:3312ed629f01 9 *
mbed_official 445:3312ed629f01 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 445:3312ed629f01 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 445:3312ed629f01 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 445:3312ed629f01 13 * See the License for the specific language governing permissions and
mbed_official 445:3312ed629f01 14 * limitations under the License.
mbed_official 445:3312ed629f01 15 */
mbed_official 445:3312ed629f01 16 #include "mbed_assert.h"
mbed_official 445:3312ed629f01 17 #include "analogin_api.h"
mbed_official 445:3312ed629f01 18
mbed_official 445:3312ed629f01 19 #include "cmsis.h"
mbed_official 445:3312ed629f01 20 #include "pinmap.h"
mbed_official 445:3312ed629f01 21 #include "clk_freqs.h"
mbed_official 445:3312ed629f01 22 #include "PeripheralPins.h"
mbed_official 445:3312ed629f01 23
mbed_official 445:3312ed629f01 24 #define MAX_FADC 6000000
mbed_official 445:3312ed629f01 25
mbed_official 445:3312ed629f01 26 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 445:3312ed629f01 27 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 445:3312ed629f01 28 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 445:3312ed629f01 29
mbed_official 445:3312ed629f01 30 SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
mbed_official 445:3312ed629f01 31
mbed_official 445:3312ed629f01 32 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
mbed_official 445:3312ed629f01 33 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
mbed_official 445:3312ed629f01 34
mbed_official 445:3312ed629f01 35 // bus clk
mbed_official 445:3312ed629f01 36 uint32_t PCLK = bus_frequency();
mbed_official 445:3312ed629f01 37 uint32_t clkdiv;
mbed_official 445:3312ed629f01 38 for (clkdiv = 0; clkdiv < 4; clkdiv++) {
mbed_official 445:3312ed629f01 39 if ((PCLK >> clkdiv) <= MAX_FADC)
mbed_official 445:3312ed629f01 40 break;
mbed_official 445:3312ed629f01 41 }
mbed_official 445:3312ed629f01 42 if (clkdiv == 4) //Set max div
mbed_official 445:3312ed629f01 43 clkdiv = 0x7;
mbed_official 445:3312ed629f01 44
mbed_official 445:3312ed629f01 45 ADC0->SC1[1] = ADC_SC1_ADCH(obj->adc);
mbed_official 445:3312ed629f01 46
mbed_official 445:3312ed629f01 47 ADC0->CFG1 = ADC_CFG1_ADLPC_MASK // Low-Power Configuration
mbed_official 445:3312ed629f01 48 | ADC_CFG1_ADIV(clkdiv & 0x3) // Clock Divide Select
mbed_official 445:3312ed629f01 49 | ADC_CFG1_ADLSMP_MASK // Long Sample Time
mbed_official 445:3312ed629f01 50 | ADC_CFG1_MODE(3) // (16)bits Resolution
mbed_official 445:3312ed629f01 51 | ADC_CFG1_ADICLK(clkdiv >> 2); // Input Clock
mbed_official 445:3312ed629f01 52
mbed_official 445:3312ed629f01 53 ADC0->CFG2 = ADC_CFG2_MUXSEL_MASK // ADxxb or ADxxa channels
mbed_official 445:3312ed629f01 54 | ADC_CFG2_ADHSC_MASK // High-Speed Configuration
mbed_official 445:3312ed629f01 55 | ADC_CFG2_ADLSTS(0); // Long Sample Time Select
mbed_official 445:3312ed629f01 56
mbed_official 445:3312ed629f01 57 ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference
mbed_official 445:3312ed629f01 58
mbed_official 445:3312ed629f01 59 ADC0->SC3 = ADC_SC3_AVGE_MASK // Hardware Average Enable
mbed_official 445:3312ed629f01 60 | ADC_SC3_AVGS(0); // 4 Samples Averaged
mbed_official 445:3312ed629f01 61
mbed_official 445:3312ed629f01 62 pinmap_pinout(pin, PinMap_ADC);
mbed_official 445:3312ed629f01 63 }
mbed_official 445:3312ed629f01 64
mbed_official 445:3312ed629f01 65 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 445:3312ed629f01 66 // start conversion
mbed_official 445:3312ed629f01 67 ADC0->SC1[0] = ADC_SC1_ADCH(obj->adc);
mbed_official 445:3312ed629f01 68
mbed_official 445:3312ed629f01 69 // Wait Conversion Complete
mbed_official 445:3312ed629f01 70 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
mbed_official 445:3312ed629f01 71
mbed_official 445:3312ed629f01 72 return (uint16_t)ADC0->R[0];
mbed_official 445:3312ed629f01 73 }
mbed_official 445:3312ed629f01 74
mbed_official 445:3312ed629f01 75 float analogin_read(analogin_t *obj) {
mbed_official 445:3312ed629f01 76 uint16_t value = analogin_read_u16(obj);
mbed_official 445:3312ed629f01 77 return (float)value * (1.0f / (float)0xFFFF);
mbed_official 445:3312ed629f01 78 }