mbed library sources
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targets/hal/TARGET_NXP/TARGET_LPC82X/analogin_api.c@613:bc40b8d2aec4, 2015-08-20 (annotated)
- Committer:
- mbed_official
- Date:
- Thu Aug 20 10:45:13 2015 +0100
- Revision:
- 613:bc40b8d2aec4
- Parent:
- 337:6ed01c00b962
Synchronized with git revision 92ca8c7b60a283b6bb60eb65b183dac1599f0ade
Full URL: https://github.com/mbedmicro/mbed/commit/92ca8c7b60a283b6bb60eb65b183dac1599f0ade/
Nordic: update application start address in GCC linker script
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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mbed_official | 337:6ed01c00b962 | 1 | /* mbed Microcontroller Library |
mbed_official | 337:6ed01c00b962 | 2 | * Copyright (c) 2006-2013 ARM Limited |
mbed_official | 337:6ed01c00b962 | 3 | * |
mbed_official | 337:6ed01c00b962 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 337:6ed01c00b962 | 5 | * you may not use this file except in compliance with the License. |
mbed_official | 337:6ed01c00b962 | 6 | * You may obtain a copy of the License at |
mbed_official | 337:6ed01c00b962 | 7 | * |
mbed_official | 337:6ed01c00b962 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 337:6ed01c00b962 | 9 | * |
mbed_official | 337:6ed01c00b962 | 10 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 337:6ed01c00b962 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 337:6ed01c00b962 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 337:6ed01c00b962 | 13 | * See the License for the specific language governing permissions and |
mbed_official | 337:6ed01c00b962 | 14 | * limitations under the License. |
mbed_official | 337:6ed01c00b962 | 15 | */ |
mbed_official | 337:6ed01c00b962 | 16 | #include "mbed_assert.h" |
mbed_official | 337:6ed01c00b962 | 17 | #include "analogin_api.h" |
mbed_official | 337:6ed01c00b962 | 18 | #include "cmsis.h" |
mbed_official | 337:6ed01c00b962 | 19 | #include "pinmap.h" |
mbed_official | 337:6ed01c00b962 | 20 | #include "PeripheralNames.h" |
mbed_official | 337:6ed01c00b962 | 21 | |
mbed_official | 337:6ed01c00b962 | 22 | #if DEVICE_ANALOGIN |
mbed_official | 337:6ed01c00b962 | 23 | |
mbed_official | 337:6ed01c00b962 | 24 | #define ANALOGIN_MEDIAN_FILTER 1 |
mbed_official | 337:6ed01c00b962 | 25 | |
mbed_official | 337:6ed01c00b962 | 26 | #define ADC_RANGE 0xFFF |
mbed_official | 337:6ed01c00b962 | 27 | |
mbed_official | 337:6ed01c00b962 | 28 | static const PinMap PinMap_ADC[] = { |
mbed_official | 337:6ed01c00b962 | 29 | {P0_7 , ADC_0, 0}, |
mbed_official | 337:6ed01c00b962 | 30 | {P0_6 , ADC_1, 0}, |
mbed_official | 337:6ed01c00b962 | 31 | {P0_14, ADC_2, 0}, |
mbed_official | 337:6ed01c00b962 | 32 | {P0_23, ADC_3, 0}, |
mbed_official | 337:6ed01c00b962 | 33 | {P0_22, ADC_4, 0}, |
mbed_official | 337:6ed01c00b962 | 34 | {P0_21, ADC_5, 0}, |
mbed_official | 337:6ed01c00b962 | 35 | {P0_20, ADC_6, 0}, |
mbed_official | 337:6ed01c00b962 | 36 | {P0_19, ADC_7, 0}, |
mbed_official | 337:6ed01c00b962 | 37 | {P0_18, ADC_8, 0}, |
mbed_official | 337:6ed01c00b962 | 38 | {P0_17, ADC_9, 0}, |
mbed_official | 337:6ed01c00b962 | 39 | {P0_13, ADC_10,0}, |
mbed_official | 337:6ed01c00b962 | 40 | {P0_4 , ADC_11,0}, |
mbed_official | 337:6ed01c00b962 | 41 | }; |
mbed_official | 337:6ed01c00b962 | 42 | |
mbed_official | 337:6ed01c00b962 | 43 | void analogin_init(analogin_t *obj, PinName pin) |
mbed_official | 337:6ed01c00b962 | 44 | { |
mbed_official | 337:6ed01c00b962 | 45 | obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); |
mbed_official | 337:6ed01c00b962 | 46 | MBED_ASSERT(obj->adc != (ADCName)NC); |
mbed_official | 337:6ed01c00b962 | 47 | |
mbed_official | 337:6ed01c00b962 | 48 | LPC_SYSCON->SYSAHBCLKCTRL |= (1UL << 6); |
mbed_official | 337:6ed01c00b962 | 49 | // pin enable |
mbed_official | 337:6ed01c00b962 | 50 | LPC_SWM->PINENABLE0 &= ~(1UL << (13 + obj->adc)); |
mbed_official | 337:6ed01c00b962 | 51 | // configure GPIO as input |
mbed_official | 337:6ed01c00b962 | 52 | LPC_GPIO_PORT->DIR0 &= ~(1UL << (pin >> PIN_SHIFT)); |
mbed_official | 337:6ed01c00b962 | 53 | |
mbed_official | 337:6ed01c00b962 | 54 | LPC_SYSCON->PDRUNCFG &= ~(1 << 4); |
mbed_official | 337:6ed01c00b962 | 55 | LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 24); |
mbed_official | 337:6ed01c00b962 | 56 | |
mbed_official | 337:6ed01c00b962 | 57 | __IO LPC_ADC_Type *adc_reg = LPC_ADC; |
mbed_official | 337:6ed01c00b962 | 58 | |
mbed_official | 337:6ed01c00b962 | 59 | // determine the system clock divider for a 500kHz ADC clock during calibration |
mbed_official | 337:6ed01c00b962 | 60 | uint32_t clkdiv = (SystemCoreClock / 500000) - 1; |
mbed_official | 337:6ed01c00b962 | 61 | |
mbed_official | 337:6ed01c00b962 | 62 | // perform a self-calibration |
mbed_official | 337:6ed01c00b962 | 63 | adc_reg->CTRL = (1UL << 30) | (clkdiv & 0xFF); |
mbed_official | 337:6ed01c00b962 | 64 | while ((adc_reg->CTRL & (1UL << 30)) != 0); |
mbed_official | 337:6ed01c00b962 | 65 | } |
mbed_official | 337:6ed01c00b962 | 66 | |
mbed_official | 337:6ed01c00b962 | 67 | static inline uint32_t adc_read(analogin_t *obj) |
mbed_official | 337:6ed01c00b962 | 68 | { |
mbed_official | 337:6ed01c00b962 | 69 | uint32_t channels; |
mbed_official | 337:6ed01c00b962 | 70 | __IO LPC_ADC_Type *adc_reg = LPC_ADC; |
mbed_official | 337:6ed01c00b962 | 71 | |
mbed_official | 337:6ed01c00b962 | 72 | channels = (obj->adc & 0x1F); |
mbed_official | 337:6ed01c00b962 | 73 | |
mbed_official | 337:6ed01c00b962 | 74 | // select channel |
mbed_official | 337:6ed01c00b962 | 75 | adc_reg->SEQA_CTRL &= ~(0xFFF); |
mbed_official | 337:6ed01c00b962 | 76 | adc_reg->SEQA_CTRL |= (1UL << channels); |
mbed_official | 337:6ed01c00b962 | 77 | |
mbed_official | 337:6ed01c00b962 | 78 | // start conversion and sequence enable |
mbed_official | 337:6ed01c00b962 | 79 | adc_reg->SEQA_CTRL |= ((1UL << 26) | (1UL << 31)); |
mbed_official | 337:6ed01c00b962 | 80 | |
mbed_official | 337:6ed01c00b962 | 81 | // Repeatedly get the sample data until DONE bit |
mbed_official | 337:6ed01c00b962 | 82 | volatile uint32_t data; |
mbed_official | 337:6ed01c00b962 | 83 | do { |
mbed_official | 337:6ed01c00b962 | 84 | data = adc_reg->SEQA_GDAT; |
mbed_official | 337:6ed01c00b962 | 85 | } while ((data & (1UL << 31)) == 0); |
mbed_official | 337:6ed01c00b962 | 86 | |
mbed_official | 337:6ed01c00b962 | 87 | // Stop conversion |
mbed_official | 337:6ed01c00b962 | 88 | adc_reg->SEQA_CTRL &= ~(1UL << 31); |
mbed_official | 337:6ed01c00b962 | 89 | |
mbed_official | 337:6ed01c00b962 | 90 | return ((data >> 4) & ADC_RANGE); |
mbed_official | 337:6ed01c00b962 | 91 | } |
mbed_official | 337:6ed01c00b962 | 92 | |
mbed_official | 337:6ed01c00b962 | 93 | static inline void order(uint32_t *a, uint32_t *b) |
mbed_official | 337:6ed01c00b962 | 94 | { |
mbed_official | 337:6ed01c00b962 | 95 | if (*a > *b) { |
mbed_official | 337:6ed01c00b962 | 96 | uint32_t t = *a; |
mbed_official | 337:6ed01c00b962 | 97 | *a = *b; |
mbed_official | 337:6ed01c00b962 | 98 | *b = t; |
mbed_official | 337:6ed01c00b962 | 99 | } |
mbed_official | 337:6ed01c00b962 | 100 | } |
mbed_official | 337:6ed01c00b962 | 101 | |
mbed_official | 337:6ed01c00b962 | 102 | static inline uint32_t adc_read_u32(analogin_t *obj) |
mbed_official | 337:6ed01c00b962 | 103 | { |
mbed_official | 337:6ed01c00b962 | 104 | uint32_t value; |
mbed_official | 337:6ed01c00b962 | 105 | #if ANALOGIN_MEDIAN_FILTER |
mbed_official | 337:6ed01c00b962 | 106 | uint32_t v1 = adc_read(obj); |
mbed_official | 337:6ed01c00b962 | 107 | uint32_t v2 = adc_read(obj); |
mbed_official | 337:6ed01c00b962 | 108 | uint32_t v3 = adc_read(obj); |
mbed_official | 337:6ed01c00b962 | 109 | order(&v1, &v2); |
mbed_official | 337:6ed01c00b962 | 110 | order(&v2, &v3); |
mbed_official | 337:6ed01c00b962 | 111 | order(&v1, &v2); |
mbed_official | 337:6ed01c00b962 | 112 | value = v2; |
mbed_official | 337:6ed01c00b962 | 113 | #else |
mbed_official | 337:6ed01c00b962 | 114 | value = adc_read(obj); |
mbed_official | 337:6ed01c00b962 | 115 | #endif |
mbed_official | 337:6ed01c00b962 | 116 | return value; |
mbed_official | 337:6ed01c00b962 | 117 | } |
mbed_official | 337:6ed01c00b962 | 118 | |
mbed_official | 337:6ed01c00b962 | 119 | uint16_t analogin_read_u16(analogin_t *obj) |
mbed_official | 337:6ed01c00b962 | 120 | { |
mbed_official | 337:6ed01c00b962 | 121 | uint32_t value = adc_read_u32(obj); |
mbed_official | 337:6ed01c00b962 | 122 | return (value << 4) | ((value >> 8) & 0x000F); // 12 bit |
mbed_official | 337:6ed01c00b962 | 123 | } |
mbed_official | 337:6ed01c00b962 | 124 | |
mbed_official | 337:6ed01c00b962 | 125 | float analogin_read(analogin_t *obj) |
mbed_official | 337:6ed01c00b962 | 126 | { |
mbed_official | 337:6ed01c00b962 | 127 | uint32_t value = adc_read_u32(obj); |
mbed_official | 337:6ed01c00b962 | 128 | return (float)value * (1.0f / (float)ADC_RANGE); |
mbed_official | 337:6ed01c00b962 | 129 | } |
mbed_official | 337:6ed01c00b962 | 130 | |
mbed_official | 337:6ed01c00b962 | 131 | #endif |