mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/hal/TARGET_NXP/TARGET_LPC43XX/analogin_api.c@144:ef7eb2e8f9f7, 2016-09-02 (annotated)

Committer:
<>
Date:
Fri Sep 02 15:07:44 2016 +0100
Revision:
144:ef7eb2e8f9f7
Parent:
0:9b334a45a8ff
Child:
148:21d94c44109e
This updates the lib to the mbed lib v125

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 *
<> 144:ef7eb2e8f9f7 16 * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
<> 144:ef7eb2e8f9f7 17 */
<> 144:ef7eb2e8f9f7 18 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 19 #include "analogin_api.h"
<> 144:ef7eb2e8f9f7 20 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 21 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 22 #include "mbed_error.h"
<> 144:ef7eb2e8f9f7 23 #include "gpio_api.h"
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 #define ANALOGIN_MEDIAN_FILTER 1
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 static inline int div_round_up(int x, int y) {
<> 144:ef7eb2e8f9f7 28 return (x + (y - 1)) / y;
<> 144:ef7eb2e8f9f7 29 }
<> 144:ef7eb2e8f9f7 30
<> 144:ef7eb2e8f9f7 31 static const PinMap PinMap_ADC[] = {
<> 144:ef7eb2e8f9f7 32 {P4_3, ADC0_0, 0},
<> 144:ef7eb2e8f9f7 33 {P4_1, ADC0_1, 0},
<> 144:ef7eb2e8f9f7 34 {PF_8, ADC0_2, 0},
<> 144:ef7eb2e8f9f7 35 {P7_5, ADC0_3, 0},
<> 144:ef7eb2e8f9f7 36 {P7_4, ADC0_4, 0},
<> 144:ef7eb2e8f9f7 37 {PF_10, ADC0_5, 0},
<> 144:ef7eb2e8f9f7 38 {PB_6, ADC0_6, 0},
<> 144:ef7eb2e8f9f7 39 {PC_3, ADC1_0, 0},
<> 144:ef7eb2e8f9f7 40 {PC_0, ADC1_1, 0},
<> 144:ef7eb2e8f9f7 41 {PF_9, ADC1_2, 0},
<> 144:ef7eb2e8f9f7 42 {PF_6, ADC1_3, 0},
<> 144:ef7eb2e8f9f7 43 {PF_5, ADC1_4, 0},
<> 144:ef7eb2e8f9f7 44 {PF_11, ADC1_5, 0},
<> 144:ef7eb2e8f9f7 45 {P7_7, ADC1_6, 0},
<> 144:ef7eb2e8f9f7 46 {PF_7, ADC1_7, 0},
<> 144:ef7eb2e8f9f7 47 {NC, NC, 0 }
<> 144:ef7eb2e8f9f7 48 };
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 void analogin_init(analogin_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 51 ADCName name;
<> 144:ef7eb2e8f9f7 52
<> 144:ef7eb2e8f9f7 53 name = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
<> 144:ef7eb2e8f9f7 54 MBED_ASSERT(obj->adc != (LPC_ADC_T *)NC);
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 // Set ADC register, number and channel
<> 144:ef7eb2e8f9f7 57 obj->num = (name >> ADC0_7) ? 1 : 0;
<> 144:ef7eb2e8f9f7 58 obj->ch = name % (ADC0_7 + 1);
<> 144:ef7eb2e8f9f7 59 obj->adc = (LPC_ADC_T *) (obj->num > 0) ? LPC_ADC1 : LPC_ADC0;
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 // Reset pin function to GPIO
<> 144:ef7eb2e8f9f7 62 gpio_set(pin);
<> 144:ef7eb2e8f9f7 63 // Select ADC on analog function select register in SCU
<> 144:ef7eb2e8f9f7 64 LPC_SCU->ENAIO[obj->num] |= (1 << obj->ch);
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 // Calculate minimum clock divider
<> 144:ef7eb2e8f9f7 67 // clkdiv = divider - 1
<> 144:ef7eb2e8f9f7 68 uint32_t PCLK = SystemCoreClock;
<> 144:ef7eb2e8f9f7 69 uint32_t adcRate = 400000;
<> 144:ef7eb2e8f9f7 70 uint32_t clkdiv = div_round_up(PCLK, adcRate) - 1;
<> 144:ef7eb2e8f9f7 71
<> 144:ef7eb2e8f9f7 72 // Set the generic software-controlled ADC settings
<> 144:ef7eb2e8f9f7 73 obj->adc->CR = (0 << 0) // SEL: 0 = no channels selected
<> 144:ef7eb2e8f9f7 74 | (clkdiv << 8) // CLKDIV:
<> 144:ef7eb2e8f9f7 75 | (0 << 16) // BURST: 0 = software control
<> 144:ef7eb2e8f9f7 76 | (1 << 21) // PDN: 1 = operational
<> 144:ef7eb2e8f9f7 77 | (0 << 24) // START: 0 = no start
<> 144:ef7eb2e8f9f7 78 | (0 << 27); // EDGE: not applicable
<> 144:ef7eb2e8f9f7 79 }
<> 144:ef7eb2e8f9f7 80
<> 144:ef7eb2e8f9f7 81 static inline uint32_t adc_read(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 82 uint32_t temp;
<> 144:ef7eb2e8f9f7 83 uint8_t channel = obj->ch;
<> 144:ef7eb2e8f9f7 84 LPC_ADC_T *pADC = obj->adc;
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 // Select the appropriate channel and start conversion
<> 144:ef7eb2e8f9f7 87 pADC->CR |= ADC_CR_CH_SEL(channel);
<> 144:ef7eb2e8f9f7 88 temp = pADC->CR & ~ADC_CR_START_MASK;
<> 144:ef7eb2e8f9f7 89 pADC->CR = temp | (ADC_CR_START_MODE_SEL(ADC_START_NOW));
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 // Wait for DONE bit and read data
<> 144:ef7eb2e8f9f7 92 while (!(pADC->STAT & ADC_CR_CH_SEL(channel)));
<> 144:ef7eb2e8f9f7 93 temp = pADC->DR[channel];
<> 144:ef7eb2e8f9f7 94
<> 144:ef7eb2e8f9f7 95 // Deselect channel and return result
<> 144:ef7eb2e8f9f7 96 pADC->CR &= ~ADC_CR_START_MASK;
<> 144:ef7eb2e8f9f7 97 pADC->CR &= ~ADC_CR_CH_SEL(channel);
<> 144:ef7eb2e8f9f7 98 return ADC_DR_RESULT(temp);
<> 144:ef7eb2e8f9f7 99 }
<> 144:ef7eb2e8f9f7 100
<> 144:ef7eb2e8f9f7 101 static inline void order(uint32_t *a, uint32_t *b) {
<> 144:ef7eb2e8f9f7 102 if (*a > *b) {
<> 144:ef7eb2e8f9f7 103 uint32_t t = *a;
<> 144:ef7eb2e8f9f7 104 *a = *b;
<> 144:ef7eb2e8f9f7 105 *b = t;
<> 144:ef7eb2e8f9f7 106 }
<> 144:ef7eb2e8f9f7 107 }
<> 144:ef7eb2e8f9f7 108
<> 144:ef7eb2e8f9f7 109 static inline uint32_t adc_read_u32(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 110 uint32_t value;
<> 144:ef7eb2e8f9f7 111 #if ANALOGIN_MEDIAN_FILTER
<> 144:ef7eb2e8f9f7 112 uint32_t v1 = adc_read(obj);
<> 144:ef7eb2e8f9f7 113 uint32_t v2 = adc_read(obj);
<> 144:ef7eb2e8f9f7 114 uint32_t v3 = adc_read(obj);
<> 144:ef7eb2e8f9f7 115 order(&v1, &v2);
<> 144:ef7eb2e8f9f7 116 order(&v2, &v3);
<> 144:ef7eb2e8f9f7 117 order(&v1, &v2);
<> 144:ef7eb2e8f9f7 118 value = v2;
<> 144:ef7eb2e8f9f7 119 #else
<> 144:ef7eb2e8f9f7 120 value = adc_read(obj);
<> 144:ef7eb2e8f9f7 121 #endif
<> 144:ef7eb2e8f9f7 122 return value;
<> 144:ef7eb2e8f9f7 123 }
<> 144:ef7eb2e8f9f7 124
<> 144:ef7eb2e8f9f7 125 uint16_t analogin_read_u16(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 126 uint32_t value = adc_read_u32(obj);
<> 144:ef7eb2e8f9f7 127
<> 144:ef7eb2e8f9f7 128 return (value << 6) | ((value >> 4) & 0x003F); // 10 bit
<> 144:ef7eb2e8f9f7 129 }
<> 144:ef7eb2e8f9f7 130
<> 144:ef7eb2e8f9f7 131 float analogin_read(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 132 uint32_t value = adc_read_u32(obj);
<> 144:ef7eb2e8f9f7 133 return (float)value * (1.0f / (float)ADC_RANGE);
<> 144:ef7eb2e8f9f7 134 }