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targets/hal/TARGET_NXP/TARGET_LPC11U6X/analogin_api.c@186:2e805bf06ee4, 2014-05-12 (annotated)

Committer:
mbed_official
Date:
Mon May 12 10:15:06 2014 +0100
Revision:
186:2e805bf06ee4
Child:
193:cff126de7aaf
Synchronized with git revision f41d1e8383b601b353319ce36d53b9b84fb476a3



Full URL: https://github.com/mbedmicro/mbed/commit/f41d1e8383b601b353319ce36d53b9b84fb476a3/

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 186:2e805bf06ee4 16
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 186:2e805bf06ee4 20 #include "error.h"
mbed_official 186:2e805bf06ee4 21
mbed_official 186:2e805bf06ee4 22 #ifdef 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 186:2e805bf06ee4 53 if (obj->adc == (uint32_t)NC) {
mbed_official 186:2e805bf06ee4 54 error("ADC pin mapping failed");
mbed_official 186:2e805bf06ee4 55 }
mbed_official 186:2e805bf06ee4 56 pinmap_pinout(pin, PinMap_ADC);
mbed_official 186:2e805bf06ee4 57
mbed_official 186:2e805bf06ee4 58 // ADC Powered
mbed_official 186:2e805bf06ee4 59 tmp = (LPC_SYSCON->PDRUNCFG & PDRUN_VALID_BITS);
mbed_official 186:2e805bf06ee4 60 tmp &= ~((1 << 4) & PDRUN_VALID_BITS);
mbed_official 186:2e805bf06ee4 61 LPC_SYSCON->PDRUNCFG = (tmp | PDRUN_RESERVED_ONE);
mbed_official 186:2e805bf06ee4 62
mbed_official 186:2e805bf06ee4 63 // Enable clock for ADC
mbed_official 186:2e805bf06ee4 64 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 13);
mbed_official 186:2e805bf06ee4 65
mbed_official 186:2e805bf06ee4 66 // Start ADC self-calibration
mbed_official 186:2e805bf06ee4 67 LPC_ADC->CTRL = (1UL << 30) || (100);
mbed_official 186:2e805bf06ee4 68 do {
mbed_official 186:2e805bf06ee4 69 tmp = LPC_ADC->CTRL;
mbed_official 186:2e805bf06ee4 70 } while ((tmp & (1UL << 30)) != 0);
mbed_official 186:2e805bf06ee4 71
mbed_official 186:2e805bf06ee4 72 LPC_ADC->CTRL = 100;
mbed_official 186:2e805bf06ee4 73 }
mbed_official 186:2e805bf06ee4 74
mbed_official 186:2e805bf06ee4 75 static inline uint32_t adc_read(analogin_t *obj) {
mbed_official 186:2e805bf06ee4 76
mbed_official 186:2e805bf06ee4 77 // select channel
mbed_official 186:2e805bf06ee4 78 LPC_ADC->SEQA_CTRL &= ~(0xFFF);
mbed_official 186:2e805bf06ee4 79 LPC_ADC->SEQA_CTRL |= (1UL << obj->adc);
mbed_official 186:2e805bf06ee4 80
mbed_official 186:2e805bf06ee4 81 // start conversion, sequence enable with async mode
mbed_official 186:2e805bf06ee4 82 LPC_ADC->SEQA_CTRL |= ((1UL << 26) | (1UL << 31) | (1UL << 29) /*| (1UL << 19)*/);
mbed_official 186:2e805bf06ee4 83
mbed_official 186:2e805bf06ee4 84 // Repeatedly get the sample data until DONE bit
mbed_official 186:2e805bf06ee4 85 volatile uint32_t data;
mbed_official 186:2e805bf06ee4 86 do {
mbed_official 186:2e805bf06ee4 87 data = LPC_ADC->SEQA_GDAT;
mbed_official 186:2e805bf06ee4 88 } while ((data & (1UL << 31)) == 0);
mbed_official 186:2e805bf06ee4 89 data = LPC_ADC->DAT[obj->adc];
mbed_official 186:2e805bf06ee4 90
mbed_official 186:2e805bf06ee4 91 // Stop conversion
mbed_official 186:2e805bf06ee4 92 LPC_ADC->SEQA_CTRL &= ~(1UL << 31);
mbed_official 186:2e805bf06ee4 93
mbed_official 186:2e805bf06ee4 94 return ((data >> 4) & ADC_RANGE);
mbed_official 186:2e805bf06ee4 95 }
mbed_official 186:2e805bf06ee4 96
mbed_official 186:2e805bf06ee4 97 static inline void order(uint32_t *a, uint32_t *b) {
mbed_official 186:2e805bf06ee4 98 if (*a > *b) {
mbed_official 186:2e805bf06ee4 99 uint32_t t = *a;
mbed_official 186:2e805bf06ee4 100 *a = *b;
mbed_official 186:2e805bf06ee4 101 *b = t;
mbed_official 186:2e805bf06ee4 102 }
mbed_official 186:2e805bf06ee4 103 }
mbed_official 186:2e805bf06ee4 104
mbed_official 186:2e805bf06ee4 105 static inline uint32_t adc_read_u32(analogin_t *obj) {
mbed_official 186:2e805bf06ee4 106 uint32_t value;
mbed_official 186:2e805bf06ee4 107 #if ANALOGIN_MEDIAN_FILTER
mbed_official 186:2e805bf06ee4 108 uint32_t v1 = adc_read(obj);
mbed_official 186:2e805bf06ee4 109 uint32_t v2 = adc_read(obj);
mbed_official 186:2e805bf06ee4 110 uint32_t v3 = adc_read(obj);
mbed_official 186:2e805bf06ee4 111 order(&v1, &v2);
mbed_official 186:2e805bf06ee4 112 order(&v2, &v3);
mbed_official 186:2e805bf06ee4 113 order(&v1, &v2);
mbed_official 186:2e805bf06ee4 114 value = v2;
mbed_official 186:2e805bf06ee4 115 #else
mbed_official 186:2e805bf06ee4 116 value = adc_read(obj);
mbed_official 186:2e805bf06ee4 117 #endif
mbed_official 186:2e805bf06ee4 118 return value;
mbed_official 186:2e805bf06ee4 119 }
mbed_official 186:2e805bf06ee4 120
mbed_official 186:2e805bf06ee4 121 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 186:2e805bf06ee4 122 uint32_t value = adc_read_u32(obj);
mbed_official 186:2e805bf06ee4 123 return (value << 4) | ((value >> 8) & 0x000F); // 12 bit
mbed_official 186:2e805bf06ee4 124 }
mbed_official 186:2e805bf06ee4 125
mbed_official 186:2e805bf06ee4 126 float analogin_read(analogin_t *obj) {
mbed_official 186:2e805bf06ee4 127 uint32_t value = adc_read_u32(obj);
mbed_official 186:2e805bf06ee4 128 return (float)value * (1.0f / (float)ADC_RANGE);
mbed_official 186:2e805bf06ee4 129 }
mbed_official 186:2e805bf06ee4 130
mbed_official 186:2e805bf06ee4 131 #endif