Paul Paterson / mbed-src-CanNucleoF0

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Dependents:   CanNucleoF0_example

Fork of mbed-src by mbed official

vendor/Freescale/KL25Z/hal/analogin_api.c@12:5fa2273de5db, 2013-07-24 (annotated)

Committer:
emimon01
Date:
Wed Jul 24 11:11:21 2013 +0100
Revision:
12:5fa2273de5db
Parent:
10:3bc89ef62ce7 
Remove sources for toolchains unknown by the online compiler

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 10:3bc89ef62ce7 1 /* mbed Microcontroller Library
emilmont 10:3bc89ef62ce7 2 * Copyright (c) 2006-2013 ARM Limited
emilmont 10:3bc89ef62ce7 3 *
emilmont 10:3bc89ef62ce7 4 * Licensed under the Apache License, Version 2.0 (the "License");
emilmont 10:3bc89ef62ce7 5 * you may not use this file except in compliance with the License.
emilmont 10:3bc89ef62ce7 6 * You may obtain a copy of the License at
emilmont 10:3bc89ef62ce7 7 *
emilmont 10:3bc89ef62ce7 8 * http://www.apache.org/licenses/LICENSE-2.0
emilmont 10:3bc89ef62ce7 9 *
emilmont 10:3bc89ef62ce7 10 * Unless required by applicable law or agreed to in writing, software
emilmont 10:3bc89ef62ce7 11 * distributed under the License is distributed on an "AS IS" BASIS,
emilmont 10:3bc89ef62ce7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont 10:3bc89ef62ce7 13 * See the License for the specific language governing permissions and
emilmont 10:3bc89ef62ce7 14 * limitations under the License.
emilmont 10:3bc89ef62ce7 15 */
emilmont 10:3bc89ef62ce7 16 #include "analogin_api.h"
emilmont 10:3bc89ef62ce7 17
emilmont 10:3bc89ef62ce7 18 #include "cmsis.h"
emilmont 10:3bc89ef62ce7 19 #include "pinmap.h"
emilmont 10:3bc89ef62ce7 20 #include "error.h"
emilmont 10:3bc89ef62ce7 21
emilmont 10:3bc89ef62ce7 22 static const PinMap PinMap_ADC[] = {
emilmont 10:3bc89ef62ce7 23 {PTE20, ADC0_SE0, 0},
emilmont 10:3bc89ef62ce7 24 {PTE22, ADC0_SE3, 0},
emilmont 10:3bc89ef62ce7 25 {PTE29, ADC0_SE4b, 0},
emilmont 10:3bc89ef62ce7 26 {PTE30, ADC0_SE23, 0},
emilmont 10:3bc89ef62ce7 27 {PTB0, ADC0_SE8, 0},
emilmont 10:3bc89ef62ce7 28 {PTB1, ADC0_SE9, 0},
emilmont 10:3bc89ef62ce7 29 {PTB2, ADC0_SE12, 0},
emilmont 10:3bc89ef62ce7 30 {PTB3, ADC0_SE13, 0},
emilmont 10:3bc89ef62ce7 31 {PTC0, ADC0_SE14, 0},
emilmont 10:3bc89ef62ce7 32 {PTC1, ADC0_SE15, 0},
emilmont 10:3bc89ef62ce7 33 {PTC2, ADC0_SE11, 0},
emilmont 10:3bc89ef62ce7 34 {PTD1, ADC0_SE5b, 0},
emilmont 10:3bc89ef62ce7 35 {PTD5, ADC0_SE6b, 0},
emilmont 10:3bc89ef62ce7 36 {PTD6, ADC0_SE7b, 0},
emilmont 10:3bc89ef62ce7 37 {NC, NC, 0}
emilmont 10:3bc89ef62ce7 38 };
emilmont 10:3bc89ef62ce7 39
emilmont 10:3bc89ef62ce7 40 void analogin_init(analogin_t *obj, PinName pin) {
emilmont 10:3bc89ef62ce7 41 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
emilmont 10:3bc89ef62ce7 42 if (obj->adc == (uint32_t)NC) {
emilmont 10:3bc89ef62ce7 43 error("ADC pin mapping failed");
emilmont 10:3bc89ef62ce7 44 }
emilmont 10:3bc89ef62ce7 45
emilmont 10:3bc89ef62ce7 46 SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
emilmont 10:3bc89ef62ce7 47
emilmont 10:3bc89ef62ce7 48 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
emilmont 10:3bc89ef62ce7 49 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
emilmont 10:3bc89ef62ce7 50
emilmont 10:3bc89ef62ce7 51 ADC0->SC1[1] = ADC_SC1_ADCH(obj->adc);
emilmont 10:3bc89ef62ce7 52
emilmont 10:3bc89ef62ce7 53 ADC0->CFG1 = ADC_CFG1_ADLPC_MASK // Low-Power Configuration
emilmont 10:3bc89ef62ce7 54 | ADC_CFG1_ADIV(3) // Clock Divide Select: (Input Clock)/8
emilmont 10:3bc89ef62ce7 55 | ADC_CFG1_ADLSMP_MASK // Long Sample Time
emilmont 10:3bc89ef62ce7 56 | ADC_CFG1_MODE(3) // (16)bits Resolution
emilmont 10:3bc89ef62ce7 57 | ADC_CFG1_ADICLK(1); // Input Clock: (Bus Clock)/2
emilmont 10:3bc89ef62ce7 58
emilmont 10:3bc89ef62ce7 59 ADC0->CFG2 = ADC_CFG2_MUXSEL_MASK // ADxxb channels are selected
emilmont 10:3bc89ef62ce7 60 | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable
emilmont 10:3bc89ef62ce7 61 | ADC_CFG2_ADHSC_MASK // High-Speed Configuration
emilmont 10:3bc89ef62ce7 62 | ADC_CFG2_ADLSTS(0); // Long Sample Time Select
emilmont 10:3bc89ef62ce7 63
emilmont 10:3bc89ef62ce7 64 ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference
emilmont 10:3bc89ef62ce7 65
emilmont 10:3bc89ef62ce7 66 ADC0->SC3 = ADC_SC3_AVGE_MASK // Hardware Average Enable
emilmont 10:3bc89ef62ce7 67 | ADC_SC3_AVGS(0); // 4 Samples Averaged
emilmont 10:3bc89ef62ce7 68
emilmont 10:3bc89ef62ce7 69 pinmap_pinout(pin, PinMap_ADC);
emilmont 10:3bc89ef62ce7 70 }
emilmont 10:3bc89ef62ce7 71
emilmont 10:3bc89ef62ce7 72 uint16_t analogin_read_u16(analogin_t *obj) {
emilmont 10:3bc89ef62ce7 73 // start conversion
emilmont 10:3bc89ef62ce7 74 ADC0->SC1[0] = ADC_SC1_ADCH(obj->adc);
emilmont 10:3bc89ef62ce7 75
emilmont 10:3bc89ef62ce7 76 // Wait Conversion Complete
emilmont 10:3bc89ef62ce7 77 while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
emilmont 10:3bc89ef62ce7 78
emilmont 10:3bc89ef62ce7 79 // Return value
emilmont 10:3bc89ef62ce7 80 return (uint16_t)ADC0->R[0];
emilmont 10:3bc89ef62ce7 81 }
emilmont 10:3bc89ef62ce7 82
emilmont 10:3bc89ef62ce7 83 float analogin_read(analogin_t *obj) {
emilmont 10:3bc89ef62ce7 84 uint16_t value = analogin_read_u16(obj);
emilmont 10:3bc89ef62ce7 85 return (float)value * (1.0f / (float)0xFFFF);
emilmont 10:3bc89ef62ce7 86 }
emilmont 10:3bc89ef62ce7 87