Ken Todotani / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC11U6X/analogin_api.c@250:a49055e7a707, 2014-07-08 (annotated)

Committer:
mbed_official
Date:
Tue Jul 08 11:15:08 2014 +0100
Revision:
250:a49055e7a707
Parent:
227:7bd0639b8911
Child:
251:de9a1e4ffd79
Synchronized with git revision 3197042b65f8d28e856e1a7812d45e2fbe80e3f1



Full URL: https://github.com/mbedmicro/mbed/commit/3197042b65f8d28e856e1a7812d45e2fbe80e3f1/



error.h -> mbed_error.h

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 186:2e805bf06ee4 1 /* mbed Microcontroller Library
mbed_official 186:2e805bf06ee4 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 186:2e805bf06ee4 3 *
mbed_official 186:2e805bf06ee4 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 186:2e805bf06ee4 5 * you may not use this file except in compliance with the License.
mbed_official 186:2e805bf06ee4 6 * You may obtain a copy of the License at
mbed_official 186:2e805bf06ee4 7 *
mbed_official 186:2e805bf06ee4 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 186:2e805bf06ee4 9 *
mbed_official 186:2e805bf06ee4 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 186:2e805bf06ee4 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 186:2e805bf06ee4 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 186:2e805bf06ee4 13 * See the License for the specific language governing permissions and
mbed_official 186:2e805bf06ee4 14 * limitations under the License.
mbed_official 186:2e805bf06ee4 15 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
mbed_official 186:2e805bf06ee4 17 #include "analogin_api.h"
mbed_official 186:2e805bf06ee4 18 #include "cmsis.h"
mbed_official 186:2e805bf06ee4 19 #include "pinmap.h"
mbed_official 250:a49055e7a707 20 #include "mbed_error.h"
mbed_official 186:2e805bf06ee4 21
mbed_official 193:cff126de7aaf 22 #if DEVICE_ANALOGIN
mbed_official 186:2e805bf06ee4 23
mbed_official 186:2e805bf06ee4 24 #define ANALOGIN_MEDIAN_FILTER 1
mbed_official 186:2e805bf06ee4 25
mbed_official 186:2e805bf06ee4 26 #define ADC_10BIT_RANGE 0x3FF
mbed_official 186:2e805bf06ee4 27 #define ADC_12BIT_RANGE 0xFFF
mbed_official 186:2e805bf06ee4 28 #define PDRUN_VALID_BITS 0x000025FFL
mbed_official 186:2e805bf06ee4 29 #define PDRUN_RESERVED_ONE 0x0000C800L
mbed_official 186:2e805bf06ee4 30
mbed_official 186:2e805bf06ee4 31 #define ADC_RANGE ADC_12BIT_RANGE
mbed_official 186:2e805bf06ee4 32
mbed_official 186:2e805bf06ee4 33 static const PinMap PinMap_ADC[] = {
mbed_official 186:2e805bf06ee4 34 {P1_9 , ADC_0, 3},
mbed_official 186:2e805bf06ee4 35 {P0_23, ADC_1, 1},
mbed_official 186:2e805bf06ee4 36 {P0_16, ADC_2, 1},
mbed_official 186:2e805bf06ee4 37 {P0_15, ADC_3, 3},
mbed_official 186:2e805bf06ee4 38 {P1_22, ADC_4, 3},
mbed_official 186:2e805bf06ee4 39 {P1_3 , ADC_5, 4},
mbed_official 186:2e805bf06ee4 40 {P0_14, ADC_6, 2},
mbed_official 186:2e805bf06ee4 41 {P0_13, ADC_7, 2},
mbed_official 186:2e805bf06ee4 42 {P0_12, ADC_8, 2},
mbed_official 186:2e805bf06ee4 43 {P0_11, ADC_9, 2},
mbed_official 186:2e805bf06ee4 44 {P1_29, ADC_10,4},
mbed_official 186:2e805bf06ee4 45 {P0_22, ADC_11,1},
mbed_official 186:2e805bf06ee4 46 {NC , NC ,0}
mbed_official 186:2e805bf06ee4 47 };
mbed_official 186:2e805bf06ee4 48
mbed_official 186:2e805bf06ee4 49
mbed_official 186:2e805bf06ee4 50 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 186:2e805bf06ee4 51 volatile uint32_t tmp;
mbed_official 186:2e805bf06ee4 52 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 227:7bd0639b8911 53 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 227:7bd0639b8911 54
mbed_official 186:2e805bf06ee4 55 pinmap_pinout(pin, PinMap_ADC);
mbed_official 186:2e805bf06ee4 56
mbed_official 193:cff126de7aaf 57 __IO uint32_t *reg = (__IO uint32_t*)(LPC_IOCON_BASE + (pin & 0x1FF));
mbed_official 193:cff126de7aaf 58 // set pin to ADC mode
mbed_official 193:cff126de7aaf 59 *reg &= ~(1 << 7); // set ADMODE = 0 (analog mode)
mbed_official 193:cff126de7aaf 60
mbed_official 186:2e805bf06ee4 61 // ADC Powered
mbed_official 186:2e805bf06ee4 62 tmp = (LPC_SYSCON->PDRUNCFG & PDRUN_VALID_BITS);
mbed_official 186:2e805bf06ee4 63 tmp &= ~((1 << 4) & PDRUN_VALID_BITS);
mbed_official 186:2e805bf06ee4 64 LPC_SYSCON->PDRUNCFG = (tmp | PDRUN_RESERVED_ONE);
mbed_official 186:2e805bf06ee4 65
mbed_official 186:2e805bf06ee4 66 // Enable clock for ADC
mbed_official 186:2e805bf06ee4 67 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 13);
mbed_official 193:cff126de7aaf 68
mbed_official 186:2e805bf06ee4 69 // Start ADC self-calibration
mbed_official 193:cff126de7aaf 70 LPC_ADC->CTRL = (1UL << 30);
mbed_official 186:2e805bf06ee4 71 do {
mbed_official 186:2e805bf06ee4 72 tmp = LPC_ADC->CTRL;
mbed_official 186:2e805bf06ee4 73 } while ((tmp & (1UL << 30)) != 0);
mbed_official 186:2e805bf06ee4 74
mbed_official 222:96162ccfbf43 75 LPC_ADC->CTRL = 1; // Sampling clock: SystemClock divided by 1
mbed_official 186:2e805bf06ee4 76 }
mbed_official 186:2e805bf06ee4 77
mbed_official 186:2e805bf06ee4 78 static inline uint32_t adc_read(analogin_t *obj) {
mbed_official 186:2e805bf06ee4 79
mbed_official 186:2e805bf06ee4 80 // select channel
mbed_official 186:2e805bf06ee4 81 LPC_ADC->SEQA_CTRL &= ~(0xFFF);
mbed_official 186:2e805bf06ee4 82 LPC_ADC->SEQA_CTRL |= (1UL << obj->adc);
mbed_official 186:2e805bf06ee4 83
mbed_official 186:2e805bf06ee4 84 // start conversion, sequence enable with async mode
mbed_official 193:cff126de7aaf 85 LPC_ADC->SEQA_CTRL |= ((1UL << 26) | (1UL << 31) | (1UL << 19));
mbed_official 186:2e805bf06ee4 86
mbed_official 186:2e805bf06ee4 87 // Repeatedly get the sample data until DONE bit
mbed_official 186:2e805bf06ee4 88 volatile uint32_t data;
mbed_official 186:2e805bf06ee4 89 do {
mbed_official 186:2e805bf06ee4 90 data = LPC_ADC->SEQA_GDAT;
mbed_official 186:2e805bf06ee4 91 } while ((data & (1UL << 31)) == 0);
mbed_official 186:2e805bf06ee4 92 data = LPC_ADC->DAT[obj->adc];
mbed_official 186:2e805bf06ee4 93
mbed_official 186:2e805bf06ee4 94 // Stop conversion
mbed_official 186:2e805bf06ee4 95 LPC_ADC->SEQA_CTRL &= ~(1UL << 31);
mbed_official 186:2e805bf06ee4 96
mbed_official 186:2e805bf06ee4 97 return ((data >> 4) & ADC_RANGE);
mbed_official 186:2e805bf06ee4 98 }
mbed_official 186:2e805bf06ee4 99
mbed_official 186:2e805bf06ee4 100 static inline void order(uint32_t *a, uint32_t *b) {
mbed_official 186:2e805bf06ee4 101 if (*a > *b) {
mbed_official 186:2e805bf06ee4 102 uint32_t t = *a;
mbed_official 186:2e805bf06ee4 103 *a = *b;
mbed_official 186:2e805bf06ee4 104 *b = t;
mbed_official 186:2e805bf06ee4 105 }
mbed_official 186:2e805bf06ee4 106 }
mbed_official 186:2e805bf06ee4 107
mbed_official 186:2e805bf06ee4 108 static inline uint32_t adc_read_u32(analogin_t *obj) {
mbed_official 186:2e805bf06ee4 109 uint32_t value;
mbed_official 186:2e805bf06ee4 110 #if ANALOGIN_MEDIAN_FILTER
mbed_official 186:2e805bf06ee4 111 uint32_t v1 = adc_read(obj);
mbed_official 186:2e805bf06ee4 112 uint32_t v2 = adc_read(obj);
mbed_official 186:2e805bf06ee4 113 uint32_t v3 = adc_read(obj);
mbed_official 186:2e805bf06ee4 114 order(&v1, &v2);
mbed_official 186:2e805bf06ee4 115 order(&v2, &v3);
mbed_official 186:2e805bf06ee4 116 order(&v1, &v2);
mbed_official 186:2e805bf06ee4 117 value = v2;
mbed_official 186:2e805bf06ee4 118 #else
mbed_official 186:2e805bf06ee4 119 value = adc_read(obj);
mbed_official 186:2e805bf06ee4 120 #endif
mbed_official 186:2e805bf06ee4 121 return value;
mbed_official 186:2e805bf06ee4 122 }
mbed_official 186:2e805bf06ee4 123
mbed_official 186:2e805bf06ee4 124 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 186:2e805bf06ee4 125 uint32_t value = adc_read_u32(obj);
mbed_official 186:2e805bf06ee4 126 return (value << 4) | ((value >> 8) & 0x000F); // 12 bit
mbed_official 186:2e805bf06ee4 127 }
mbed_official 186:2e805bf06ee4 128
mbed_official 186:2e805bf06ee4 129 float analogin_read(analogin_t *obj) {
mbed_official 186:2e805bf06ee4 130 uint32_t value = adc_read_u32(obj);
mbed_official 186:2e805bf06ee4 131 return (float)value * (1.0f / (float)ADC_RANGE);
mbed_official 186:2e805bf06ee4 132 }
mbed_official 186:2e805bf06ee4 133
mbed_official 186:2e805bf06ee4 134 #endif