mbed library sources: Modified to operate FRDM-KL25Z at 48MHz from internal 32kHz oscillator (nothing else changed).
Fork of mbed-src by
The only file that changed is: mbed-src-FLL48/targets/cmsis/TARGET_Freescale/TARGET_KL25Z/system_MKL25Z4.h
targets/hal/TARGET_Freescale/TARGET_KL25Z/analogin_api.c@19:398f4c622e1b, 2013-08-19 (annotated)
- Committer:
- bogdanm
- Date:
- Mon Aug 19 18:17:02 2013 +0300
- Revision:
- 19:398f4c622e1b
- Parent:
- 17:151ab7482c89
Sync with official mbed library release 66
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
emilmont | 17:151ab7482c89 | 1 | /* mbed Microcontroller Library |
emilmont | 17:151ab7482c89 | 2 | * Copyright (c) 2006-2013 ARM Limited |
emilmont | 17:151ab7482c89 | 3 | * |
emilmont | 17:151ab7482c89 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
emilmont | 17:151ab7482c89 | 5 | * you may not use this file except in compliance with the License. |
emilmont | 17:151ab7482c89 | 6 | * You may obtain a copy of the License at |
emilmont | 17:151ab7482c89 | 7 | * |
emilmont | 17:151ab7482c89 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
emilmont | 17:151ab7482c89 | 9 | * |
emilmont | 17:151ab7482c89 | 10 | * Unless required by applicable law or agreed to in writing, software |
emilmont | 17:151ab7482c89 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
emilmont | 17:151ab7482c89 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
emilmont | 17:151ab7482c89 | 13 | * See the License for the specific language governing permissions and |
emilmont | 17:151ab7482c89 | 14 | * limitations under the License. |
emilmont | 17:151ab7482c89 | 15 | */ |
emilmont | 17:151ab7482c89 | 16 | #include "analogin_api.h" |
emilmont | 17:151ab7482c89 | 17 | |
emilmont | 17:151ab7482c89 | 18 | #include "cmsis.h" |
emilmont | 17:151ab7482c89 | 19 | #include "pinmap.h" |
emilmont | 17:151ab7482c89 | 20 | #include "error.h" |
emilmont | 17:151ab7482c89 | 21 | |
emilmont | 17:151ab7482c89 | 22 | static const PinMap PinMap_ADC[] = { |
emilmont | 17:151ab7482c89 | 23 | {PTE20, ADC0_SE0, 0}, |
emilmont | 17:151ab7482c89 | 24 | {PTE22, ADC0_SE3, 0}, |
emilmont | 17:151ab7482c89 | 25 | {PTE21, ADC0_SE4a, 0}, |
emilmont | 17:151ab7482c89 | 26 | {PTE29, ADC0_SE4b, 0}, |
emilmont | 17:151ab7482c89 | 27 | {PTE30, ADC0_SE23, 0}, |
emilmont | 17:151ab7482c89 | 28 | {PTE23, ADC0_SE7a, 0}, |
emilmont | 17:151ab7482c89 | 29 | {PTB0, ADC0_SE8, 0}, |
emilmont | 17:151ab7482c89 | 30 | {PTB1, ADC0_SE9, 0}, |
emilmont | 17:151ab7482c89 | 31 | {PTB2, ADC0_SE12, 0}, |
emilmont | 17:151ab7482c89 | 32 | {PTB3, ADC0_SE13, 0}, |
emilmont | 17:151ab7482c89 | 33 | {PTC0, ADC0_SE14, 0}, |
emilmont | 17:151ab7482c89 | 34 | {PTC1, ADC0_SE15, 0}, |
emilmont | 17:151ab7482c89 | 35 | {PTC2, ADC0_SE11, 0}, |
emilmont | 17:151ab7482c89 | 36 | {PTD1, ADC0_SE5b, 0}, |
emilmont | 17:151ab7482c89 | 37 | {PTD5, ADC0_SE6b, 0}, |
emilmont | 17:151ab7482c89 | 38 | {PTD6, ADC0_SE7b, 0}, |
emilmont | 17:151ab7482c89 | 39 | {NC, NC, 0} |
emilmont | 17:151ab7482c89 | 40 | }; |
emilmont | 17:151ab7482c89 | 41 | |
emilmont | 17:151ab7482c89 | 42 | void analogin_init(analogin_t *obj, PinName pin) { |
emilmont | 17:151ab7482c89 | 43 | obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); |
bogdanm | 19:398f4c622e1b | 44 | if (obj->adc == (ADCName)NC) { |
emilmont | 17:151ab7482c89 | 45 | error("ADC pin mapping failed"); |
emilmont | 17:151ab7482c89 | 46 | } |
emilmont | 17:151ab7482c89 | 47 | |
emilmont | 17:151ab7482c89 | 48 | SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK; |
emilmont | 17:151ab7482c89 | 49 | |
emilmont | 17:151ab7482c89 | 50 | uint32_t port = (uint32_t)pin >> PORT_SHIFT; |
emilmont | 17:151ab7482c89 | 51 | SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port); |
emilmont | 17:151ab7482c89 | 52 | |
emilmont | 17:151ab7482c89 | 53 | uint32_t cfg2_muxsel = ADC_CFG2_MUXSEL_MASK; |
emilmont | 17:151ab7482c89 | 54 | if (obj->adc & (1 << CHANNELS_A_SHIFT)) { |
emilmont | 17:151ab7482c89 | 55 | cfg2_muxsel = 0; |
emilmont | 17:151ab7482c89 | 56 | } |
emilmont | 17:151ab7482c89 | 57 | |
emilmont | 17:151ab7482c89 | 58 | ADC0->SC1[1] = ADC_SC1_ADCH(obj->adc & ~(1 << CHANNELS_A_SHIFT)); |
emilmont | 17:151ab7482c89 | 59 | |
emilmont | 17:151ab7482c89 | 60 | ADC0->CFG1 = ADC_CFG1_ADLPC_MASK // Low-Power Configuration |
emilmont | 17:151ab7482c89 | 61 | | ADC_CFG1_ADIV(3) // Clock Divide Select: (Input Clock)/8 |
emilmont | 17:151ab7482c89 | 62 | | ADC_CFG1_ADLSMP_MASK // Long Sample Time |
emilmont | 17:151ab7482c89 | 63 | | ADC_CFG1_MODE(3) // (16)bits Resolution |
emilmont | 17:151ab7482c89 | 64 | | ADC_CFG1_ADICLK(1); // Input Clock: (Bus Clock)/2 |
emilmont | 17:151ab7482c89 | 65 | |
emilmont | 17:151ab7482c89 | 66 | ADC0->CFG2 = cfg2_muxsel // ADxxb or ADxxa channels |
emilmont | 17:151ab7482c89 | 67 | | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable |
emilmont | 17:151ab7482c89 | 68 | | ADC_CFG2_ADHSC_MASK // High-Speed Configuration |
emilmont | 17:151ab7482c89 | 69 | | ADC_CFG2_ADLSTS(0); // Long Sample Time Select |
emilmont | 17:151ab7482c89 | 70 | |
emilmont | 17:151ab7482c89 | 71 | ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference |
emilmont | 17:151ab7482c89 | 72 | |
emilmont | 17:151ab7482c89 | 73 | ADC0->SC3 = ADC_SC3_AVGE_MASK // Hardware Average Enable |
emilmont | 17:151ab7482c89 | 74 | | ADC_SC3_AVGS(0); // 4 Samples Averaged |
emilmont | 17:151ab7482c89 | 75 | |
emilmont | 17:151ab7482c89 | 76 | pinmap_pinout(pin, PinMap_ADC); |
emilmont | 17:151ab7482c89 | 77 | } |
emilmont | 17:151ab7482c89 | 78 | |
emilmont | 17:151ab7482c89 | 79 | uint16_t analogin_read_u16(analogin_t *obj) { |
emilmont | 17:151ab7482c89 | 80 | // start conversion |
emilmont | 17:151ab7482c89 | 81 | ADC0->SC1[0] = ADC_SC1_ADCH(obj->adc & ~(1 << CHANNELS_A_SHIFT)); |
emilmont | 17:151ab7482c89 | 82 | |
emilmont | 17:151ab7482c89 | 83 | // Wait Conversion Complete |
emilmont | 17:151ab7482c89 | 84 | while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK); |
emilmont | 17:151ab7482c89 | 85 | |
emilmont | 17:151ab7482c89 | 86 | // Return value |
emilmont | 17:151ab7482c89 | 87 | return (uint16_t)ADC0->R[0]; |
emilmont | 17:151ab7482c89 | 88 | } |
emilmont | 17:151ab7482c89 | 89 | |
emilmont | 17:151ab7482c89 | 90 | float analogin_read(analogin_t *obj) { |
emilmont | 17:151ab7482c89 | 91 | uint16_t value = analogin_read_u16(obj); |
emilmont | 17:151ab7482c89 | 92 | return (float)value * (1.0f / (float)0xFFFF); |
emilmont | 17:151ab7482c89 | 93 | } |
emilmont | 17:151ab7482c89 | 94 |