mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC15XX/analogin_api.c@217:d0ccc61c1fd4, 2014-05-27 (annotated)
- Committer:
- mbed_official
- Date:
- Tue May 27 13:00:07 2014 +0100
- Revision:
- 217:d0ccc61c1fd4
- Parent:
- 214:b6ec89a903fb
- Child:
- 227:7bd0639b8911
Synchronized with git revision bd83615ac55fe00f83e44dafc7ba017a3850f4e5
Full URL: https://github.com/mbedmicro/mbed/commit/bd83615ac55fe00f83e44dafc7ba017a3850f4e5/
[NRF51822] analog read - set channel
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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mbed_official | 103:9b881da47c92 | 1 | /* mbed Microcontroller Library |
mbed_official | 103:9b881da47c92 | 2 | * Copyright (c) 2006-2013 ARM Limited |
mbed_official | 103:9b881da47c92 | 3 | * |
mbed_official | 103:9b881da47c92 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 103:9b881da47c92 | 5 | * you may not use this file except in compliance with the License. |
mbed_official | 103:9b881da47c92 | 6 | * You may obtain a copy of the License at |
mbed_official | 103:9b881da47c92 | 7 | * |
mbed_official | 103:9b881da47c92 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 103:9b881da47c92 | 9 | * |
mbed_official | 103:9b881da47c92 | 10 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 103:9b881da47c92 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 103:9b881da47c92 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 103:9b881da47c92 | 13 | * See the License for the specific language governing permissions and |
mbed_official | 103:9b881da47c92 | 14 | * limitations under the License. |
mbed_official | 103:9b881da47c92 | 15 | */ |
mbed_official | 103:9b881da47c92 | 16 | |
mbed_official | 103:9b881da47c92 | 17 | #include "analogin_api.h" |
mbed_official | 103:9b881da47c92 | 18 | #include "cmsis.h" |
mbed_official | 103:9b881da47c92 | 19 | #include "pinmap.h" |
mbed_official | 103:9b881da47c92 | 20 | #include "error.h" |
mbed_official | 103:9b881da47c92 | 21 | |
mbed_official | 103:9b881da47c92 | 22 | #define ANALOGIN_MEDIAN_FILTER 1 |
mbed_official | 103:9b881da47c92 | 23 | |
mbed_official | 103:9b881da47c92 | 24 | #define ADC_10BIT_RANGE 0x3FF |
mbed_official | 103:9b881da47c92 | 25 | #define ADC_12BIT_RANGE 0xFFF |
mbed_official | 103:9b881da47c92 | 26 | |
mbed_official | 103:9b881da47c92 | 27 | #define ADC_RANGE ADC_12BIT_RANGE |
mbed_official | 103:9b881da47c92 | 28 | |
mbed_official | 103:9b881da47c92 | 29 | static const PinMap PinMap_ADC[] = { |
mbed_official | 103:9b881da47c92 | 30 | {P0_8 , ADC0_0, 0}, |
mbed_official | 103:9b881da47c92 | 31 | {P0_7 , ADC0_1, 0}, |
mbed_official | 103:9b881da47c92 | 32 | {P0_6 , ADC0_2, 0}, |
mbed_official | 103:9b881da47c92 | 33 | {P0_5 , ADC0_3, 0}, |
mbed_official | 103:9b881da47c92 | 34 | {P0_4 , ADC0_4, 0}, |
mbed_official | 103:9b881da47c92 | 35 | {P0_3 , ADC0_5, 0}, |
mbed_official | 103:9b881da47c92 | 36 | {P0_2 , ADC0_6, 0}, |
mbed_official | 103:9b881da47c92 | 37 | {P0_1 , ADC0_7, 0}, |
mbed_official | 103:9b881da47c92 | 38 | {P1_0 , ADC0_8, 0}, |
mbed_official | 103:9b881da47c92 | 39 | {P0_31, ADC0_9, 0}, |
mbed_official | 103:9b881da47c92 | 40 | {P0_0 , ADC0_10,0}, |
mbed_official | 103:9b881da47c92 | 41 | {P0_30, ADC0_11,0}, |
mbed_official | 103:9b881da47c92 | 42 | {P1_1 , ADC1_0, 0}, |
mbed_official | 103:9b881da47c92 | 43 | {P0_9 , ADC1_1, 0}, |
mbed_official | 103:9b881da47c92 | 44 | {P0_10, ADC1_2, 0}, |
mbed_official | 103:9b881da47c92 | 45 | {P0_11, ADC1_3, 0}, |
mbed_official | 103:9b881da47c92 | 46 | {P1_2 , ADC1_4, 0}, |
mbed_official | 103:9b881da47c92 | 47 | {P1_3 , ADC1_5, 0}, |
mbed_official | 103:9b881da47c92 | 48 | {P0_13, ADC1_6, 0}, |
mbed_official | 103:9b881da47c92 | 49 | {P0_14, ADC1_7, 0}, |
mbed_official | 103:9b881da47c92 | 50 | {P0_15, ADC1_8, 0}, |
mbed_official | 103:9b881da47c92 | 51 | {P0_16, ADC1_9, 0}, |
mbed_official | 103:9b881da47c92 | 52 | {P1_4 , ADC1_10,0}, |
mbed_official | 103:9b881da47c92 | 53 | {P1_5 , ADC1_11,0}, |
mbed_official | 103:9b881da47c92 | 54 | }; |
mbed_official | 103:9b881da47c92 | 55 | |
mbed_official | 103:9b881da47c92 | 56 | void analogin_init(analogin_t *obj, PinName pin) { |
mbed_official | 103:9b881da47c92 | 57 | obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); |
mbed_official | 103:9b881da47c92 | 58 | if (obj->adc == (uint32_t)NC) { |
mbed_official | 103:9b881da47c92 | 59 | error("ADC pin mapping failed"); |
mbed_official | 103:9b881da47c92 | 60 | } |
mbed_official | 103:9b881da47c92 | 61 | uint32_t port = (pin >> 5); |
mbed_official | 214:b6ec89a903fb | 62 | // enable clock for GPIOx |
mbed_official | 103:9b881da47c92 | 63 | LPC_SYSCON->SYSAHBCLKCTRL0 |= (1UL << (14 + port)); |
mbed_official | 214:b6ec89a903fb | 64 | // pin enable |
mbed_official | 214:b6ec89a903fb | 65 | LPC_SWM->PINENABLE0 &= ~(1UL << obj->adc); |
mbed_official | 103:9b881da47c92 | 66 | // configure GPIO as input |
mbed_official | 103:9b881da47c92 | 67 | LPC_GPIO_PORT->DIR[port] &= ~(1UL << (pin & 0x1F)); |
mbed_official | 214:b6ec89a903fb | 68 | |
mbed_official | 103:9b881da47c92 | 69 | // power up ADC |
mbed_official | 103:9b881da47c92 | 70 | if (obj->adc < ADC1_0) |
mbed_official | 103:9b881da47c92 | 71 | { |
mbed_official | 103:9b881da47c92 | 72 | // ADC0 |
mbed_official | 103:9b881da47c92 | 73 | LPC_SYSCON->PDRUNCFG &= ~(1 << 10); |
mbed_official | 103:9b881da47c92 | 74 | LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 27); |
mbed_official | 214:b6ec89a903fb | 75 | } |
mbed_official | 214:b6ec89a903fb | 76 | else { |
mbed_official | 214:b6ec89a903fb | 77 | // ADC1 |
mbed_official | 103:9b881da47c92 | 78 | LPC_SYSCON->PDRUNCFG &= ~(1 << 11); |
mbed_official | 103:9b881da47c92 | 79 | LPC_SYSCON->SYSAHBCLKCTRL0 |= (1 << 28); |
mbed_official | 214:b6ec89a903fb | 80 | } |
mbed_official | 103:9b881da47c92 | 81 | |
mbed_official | 103:9b881da47c92 | 82 | // select IRC as async. clock, divided by 1 |
mbed_official | 103:9b881da47c92 | 83 | LPC_SYSCON->ADCASYNCCLKSEL = 0; |
mbed_official | 103:9b881da47c92 | 84 | LPC_SYSCON->ADCASYNCCLKDIV = 1; |
mbed_official | 103:9b881da47c92 | 85 | |
mbed_official | 103:9b881da47c92 | 86 | __IO LPC_ADC0_Type *adc_reg = (obj->adc < ADC1_0) ? (__IO LPC_ADC0_Type*)(LPC_ADC0) : (__IO LPC_ADC0_Type*)(LPC_ADC1); |
mbed_official | 103:9b881da47c92 | 87 | |
mbed_official | 103:9b881da47c92 | 88 | // start calibration |
mbed_official | 103:9b881da47c92 | 89 | adc_reg->CTRL |= (1UL << 30); |
mbed_official | 103:9b881da47c92 | 90 | __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); |
mbed_official | 103:9b881da47c92 | 91 | |
mbed_official | 103:9b881da47c92 | 92 | // asynchronous mode |
mbed_official | 103:9b881da47c92 | 93 | adc_reg->CTRL = (1UL << 8); |
mbed_official | 103:9b881da47c92 | 94 | |
mbed_official | 103:9b881da47c92 | 95 | } |
mbed_official | 103:9b881da47c92 | 96 | |
mbed_official | 103:9b881da47c92 | 97 | static inline uint32_t adc_read(analogin_t *obj) { |
mbed_official | 217:d0ccc61c1fd4 | 98 | uint32_t channels; |
mbed_official | 103:9b881da47c92 | 99 | |
mbed_official | 103:9b881da47c92 | 100 | __IO LPC_ADC0_Type *adc_reg = (obj->adc < ADC1_0) ? (__IO LPC_ADC0_Type*)(LPC_ADC0) : (__IO LPC_ADC0_Type*)(LPC_ADC1); |
mbed_official | 103:9b881da47c92 | 101 | |
mbed_official | 214:b6ec89a903fb | 102 | if (obj->adc >= ADC1_0) |
mbed_official | 214:b6ec89a903fb | 103 | channels = ((obj->adc - ADC1_0) & 0x1F); |
mbed_official | 214:b6ec89a903fb | 104 | else |
mbed_official | 214:b6ec89a903fb | 105 | channels = (obj->adc & 0x1F); |
mbed_official | 214:b6ec89a903fb | 106 | |
mbed_official | 103:9b881da47c92 | 107 | // select channel |
mbed_official | 103:9b881da47c92 | 108 | adc_reg->SEQA_CTRL &= ~(0xFFF); |
mbed_official | 214:b6ec89a903fb | 109 | adc_reg->SEQA_CTRL |= (1UL << channels); |
mbed_official | 103:9b881da47c92 | 110 | |
mbed_official | 103:9b881da47c92 | 111 | // start conversion and sequence enable |
mbed_official | 103:9b881da47c92 | 112 | adc_reg->SEQA_CTRL |= ((1UL << 26) | (1UL << 31)); |
mbed_official | 103:9b881da47c92 | 113 | |
mbed_official | 103:9b881da47c92 | 114 | // Repeatedly get the sample data until DONE bit |
mbed_official | 103:9b881da47c92 | 115 | volatile uint32_t data; |
mbed_official | 103:9b881da47c92 | 116 | do { |
mbed_official | 103:9b881da47c92 | 117 | data = adc_reg->SEQA_GDAT; |
mbed_official | 103:9b881da47c92 | 118 | } while ((data & (1UL << 31)) == 0); |
mbed_official | 103:9b881da47c92 | 119 | |
mbed_official | 103:9b881da47c92 | 120 | // Stop conversion |
mbed_official | 103:9b881da47c92 | 121 | adc_reg->SEQA_CTRL &= ~(1UL << 31); |
mbed_official | 103:9b881da47c92 | 122 | |
mbed_official | 103:9b881da47c92 | 123 | return ((data >> 4) & ADC_RANGE); |
mbed_official | 103:9b881da47c92 | 124 | } |
mbed_official | 103:9b881da47c92 | 125 | |
mbed_official | 103:9b881da47c92 | 126 | static inline void order(uint32_t *a, uint32_t *b) { |
mbed_official | 103:9b881da47c92 | 127 | if (*a > *b) { |
mbed_official | 103:9b881da47c92 | 128 | uint32_t t = *a; |
mbed_official | 103:9b881da47c92 | 129 | *a = *b; |
mbed_official | 103:9b881da47c92 | 130 | *b = t; |
mbed_official | 103:9b881da47c92 | 131 | } |
mbed_official | 103:9b881da47c92 | 132 | } |
mbed_official | 103:9b881da47c92 | 133 | |
mbed_official | 103:9b881da47c92 | 134 | static inline uint32_t adc_read_u32(analogin_t *obj) { |
mbed_official | 103:9b881da47c92 | 135 | uint32_t value; |
mbed_official | 103:9b881da47c92 | 136 | #if ANALOGIN_MEDIAN_FILTER |
mbed_official | 103:9b881da47c92 | 137 | uint32_t v1 = adc_read(obj); |
mbed_official | 103:9b881da47c92 | 138 | uint32_t v2 = adc_read(obj); |
mbed_official | 103:9b881da47c92 | 139 | uint32_t v3 = adc_read(obj); |
mbed_official | 103:9b881da47c92 | 140 | order(&v1, &v2); |
mbed_official | 103:9b881da47c92 | 141 | order(&v2, &v3); |
mbed_official | 103:9b881da47c92 | 142 | order(&v1, &v2); |
mbed_official | 103:9b881da47c92 | 143 | value = v2; |
mbed_official | 103:9b881da47c92 | 144 | #else |
mbed_official | 103:9b881da47c92 | 145 | value = adc_read(obj); |
mbed_official | 103:9b881da47c92 | 146 | #endif |
mbed_official | 103:9b881da47c92 | 147 | return value; |
mbed_official | 103:9b881da47c92 | 148 | } |
mbed_official | 103:9b881da47c92 | 149 | |
mbed_official | 103:9b881da47c92 | 150 | uint16_t analogin_read_u16(analogin_t *obj) { |
mbed_official | 103:9b881da47c92 | 151 | uint32_t value = adc_read_u32(obj); |
mbed_official | 103:9b881da47c92 | 152 | return (value << 4) | ((value >> 8) & 0x000F); // 12 bit |
mbed_official | 103:9b881da47c92 | 153 | } |
mbed_official | 103:9b881da47c92 | 154 | |
mbed_official | 103:9b881da47c92 | 155 | float analogin_read(analogin_t *obj) { |
mbed_official | 103:9b881da47c92 | 156 | uint32_t value = adc_read_u32(obj); |
mbed_official | 103:9b881da47c92 | 157 | return (float)value * (1.0f / (float)ADC_RANGE); |
mbed_official | 103:9b881da47c92 | 158 | } |