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targets/hal/TARGET_NXP/TARGET_LPC2460/analogin_api.c@554:edd95c0879f8, 2015-06-01 (annotated)

Committer:
mbed_official
Date:
Mon Jun 01 11:00:11 2015 +0100
Revision:
554:edd95c0879f8
Synchronized with git revision 7a1d25e3dfbe5bc1457774d4af3c73383a0ff81d



Full URL: https://github.com/mbedmicro/mbed/commit/7a1d25e3dfbe5bc1457774d4af3c73383a0ff81d/



Silicon Labs - Initial test framework pin definitions for EFM32 platforms

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 554:edd95c0879f8 1 /* mbed Microcontroller Library
mbed_official 554:edd95c0879f8 2 * Copyright (c) 2006-2015 ARM Limited
mbed_official 554:edd95c0879f8 3 *
mbed_official 554:edd95c0879f8 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 554:edd95c0879f8 5 * you may not use this file except in compliance with the License.
mbed_official 554:edd95c0879f8 6 * You may obtain a copy of the License at
mbed_official 554:edd95c0879f8 7 *
mbed_official 554:edd95c0879f8 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 554:edd95c0879f8 9 *
mbed_official 554:edd95c0879f8 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 554:edd95c0879f8 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 554:edd95c0879f8 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 554:edd95c0879f8 13 * See the License for the specific language governing permissions and
mbed_official 554:edd95c0879f8 14 * limitations under the License.
mbed_official 554:edd95c0879f8 15 */
mbed_official 554:edd95c0879f8 16 #include "mbed_assert.h"
mbed_official 554:edd95c0879f8 17 #include "analogin_api.h"
mbed_official 554:edd95c0879f8 18 #include "cmsis.h"
mbed_official 554:edd95c0879f8 19 #include "pinmap.h"
mbed_official 554:edd95c0879f8 20
mbed_official 554:edd95c0879f8 21 #define ANALOGIN_MEDIAN_FILTER 1
mbed_official 554:edd95c0879f8 22
mbed_official 554:edd95c0879f8 23 #define ADC_10BIT_RANGE 0x3FF
mbed_official 554:edd95c0879f8 24 #define ADC_12BIT_RANGE 0xFFF
mbed_official 554:edd95c0879f8 25
mbed_official 554:edd95c0879f8 26 static inline int div_round_up(int x, int y) {
mbed_official 554:edd95c0879f8 27 return (x + (y - 1)) / y;
mbed_official 554:edd95c0879f8 28 }
mbed_official 554:edd95c0879f8 29
mbed_official 554:edd95c0879f8 30 static const PinMap PinMap_ADC[] = {
mbed_official 554:edd95c0879f8 31 {P0_23, ADC0_0, 1},
mbed_official 554:edd95c0879f8 32 {P0_24, ADC0_1, 1},
mbed_official 554:edd95c0879f8 33 {P0_25, ADC0_2, 1},
mbed_official 554:edd95c0879f8 34 {P0_26, ADC0_3, 1},
mbed_official 554:edd95c0879f8 35 {P1_30, ADC0_4, 3},
mbed_official 554:edd95c0879f8 36 {P1_31, ADC0_5, 3},
mbed_official 554:edd95c0879f8 37 {P0_12, ADC0_6, 3},
mbed_official 554:edd95c0879f8 38 {P0_13, ADC0_7, 3},
mbed_official 554:edd95c0879f8 39 {NC, NC, 0}
mbed_official 554:edd95c0879f8 40 };
mbed_official 554:edd95c0879f8 41
mbed_official 554:edd95c0879f8 42 #define ADC_RANGE ADC_10BIT_RANGE
mbed_official 554:edd95c0879f8 43
mbed_official 554:edd95c0879f8 44
mbed_official 554:edd95c0879f8 45 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 554:edd95c0879f8 46 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 554:edd95c0879f8 47 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 554:edd95c0879f8 48
mbed_official 554:edd95c0879f8 49 // ensure power is turned on
mbed_official 554:edd95c0879f8 50 LPC_SC->PCONP |= (1 << PCADC);
mbed_official 554:edd95c0879f8 51
mbed_official 554:edd95c0879f8 52 // set PCLK of ADC to /1
mbed_official 554:edd95c0879f8 53 LPC_SC->PCLKSEL0 &= ~(0x3 << 24);
mbed_official 554:edd95c0879f8 54 LPC_SC->PCLKSEL0 |= (0x1 << 24);
mbed_official 554:edd95c0879f8 55 uint32_t PCLK = SystemCoreClock;
mbed_official 554:edd95c0879f8 56
mbed_official 554:edd95c0879f8 57 // calculate minimum clock divider
mbed_official 554:edd95c0879f8 58 // clkdiv = divider - 1
mbed_official 554:edd95c0879f8 59 uint32_t MAX_ADC_CLK = 4500000;
mbed_official 554:edd95c0879f8 60 uint32_t clkdiv = div_round_up(PCLK, MAX_ADC_CLK) - 1;
mbed_official 554:edd95c0879f8 61
mbed_official 554:edd95c0879f8 62 // Set the generic software-controlled ADC settings
mbed_official 554:edd95c0879f8 63 LPC_ADC->ADCR = (0 << 0) // SEL: 0 = no channels selected
mbed_official 554:edd95c0879f8 64 | (clkdiv << 8) // CLKDIV: PCLK max ~= 25MHz, /25 to give safe 1MHz at fastest
mbed_official 554:edd95c0879f8 65 | (0 << 16) // BURST: 0 = software control
mbed_official 554:edd95c0879f8 66 | (0 << 17) // CLKS: not applicable
mbed_official 554:edd95c0879f8 67 | (1 << 21) // PDN: 1 = operational
mbed_official 554:edd95c0879f8 68 | (0 << 24) // START: 0 = no start
mbed_official 554:edd95c0879f8 69 | (0 << 27); // EDGE: not applicable
mbed_official 554:edd95c0879f8 70
mbed_official 554:edd95c0879f8 71 pinmap_pinout(pin, PinMap_ADC);
mbed_official 554:edd95c0879f8 72 }
mbed_official 554:edd95c0879f8 73
mbed_official 554:edd95c0879f8 74 static inline uint32_t adc_read(analogin_t *obj) {
mbed_official 554:edd95c0879f8 75 // Select the appropriate channel and start conversion
mbed_official 554:edd95c0879f8 76 LPC_ADC->ADCR &= ~0xFF;
mbed_official 554:edd95c0879f8 77 LPC_ADC->ADCR |= 1 << (int)obj->adc;
mbed_official 554:edd95c0879f8 78 LPC_ADC->ADCR |= 1 << 24;
mbed_official 554:edd95c0879f8 79
mbed_official 554:edd95c0879f8 80 // Repeatedly get the sample data until DONE bit
mbed_official 554:edd95c0879f8 81 unsigned int data;
mbed_official 554:edd95c0879f8 82 do {
mbed_official 554:edd95c0879f8 83 data = LPC_ADC->ADGDR;
mbed_official 554:edd95c0879f8 84 } while ((data & ((unsigned int)1 << 31)) == 0);
mbed_official 554:edd95c0879f8 85
mbed_official 554:edd95c0879f8 86 // Stop conversion
mbed_official 554:edd95c0879f8 87 LPC_ADC->ADCR &= ~(1 << 24);
mbed_official 554:edd95c0879f8 88
mbed_official 554:edd95c0879f8 89 return (data >> 6) & ADC_RANGE; // 10 bit
mbed_official 554:edd95c0879f8 90 }
mbed_official 554:edd95c0879f8 91
mbed_official 554:edd95c0879f8 92 static inline void order(uint32_t *a, uint32_t *b) {
mbed_official 554:edd95c0879f8 93 if (*a > *b) {
mbed_official 554:edd95c0879f8 94 uint32_t t = *a;
mbed_official 554:edd95c0879f8 95 *a = *b;
mbed_official 554:edd95c0879f8 96 *b = t;
mbed_official 554:edd95c0879f8 97 }
mbed_official 554:edd95c0879f8 98 }
mbed_official 554:edd95c0879f8 99
mbed_official 554:edd95c0879f8 100 static inline uint32_t adc_read_u32(analogin_t *obj) {
mbed_official 554:edd95c0879f8 101 uint32_t value;
mbed_official 554:edd95c0879f8 102 #if ANALOGIN_MEDIAN_FILTER
mbed_official 554:edd95c0879f8 103 uint32_t v1 = adc_read(obj);
mbed_official 554:edd95c0879f8 104 uint32_t v2 = adc_read(obj);
mbed_official 554:edd95c0879f8 105 uint32_t v3 = adc_read(obj);
mbed_official 554:edd95c0879f8 106 order(&v1, &v2);
mbed_official 554:edd95c0879f8 107 order(&v2, &v3);
mbed_official 554:edd95c0879f8 108 order(&v1, &v2);
mbed_official 554:edd95c0879f8 109 value = v2;
mbed_official 554:edd95c0879f8 110 #else
mbed_official 554:edd95c0879f8 111 value = adc_read(obj);
mbed_official 554:edd95c0879f8 112 #endif
mbed_official 554:edd95c0879f8 113 return value;
mbed_official 554:edd95c0879f8 114 }
mbed_official 554:edd95c0879f8 115
mbed_official 554:edd95c0879f8 116 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 554:edd95c0879f8 117 uint32_t value = adc_read_u32(obj);
mbed_official 554:edd95c0879f8 118
mbed_official 554:edd95c0879f8 119 return (value << 6) | ((value >> 4) & 0x003F); // 10 bit
mbed_official 554:edd95c0879f8 120 }
mbed_official 554:edd95c0879f8 121
mbed_official 554:edd95c0879f8 122 float analogin_read(analogin_t *obj) {
mbed_official 554:edd95c0879f8 123 uint32_t value = adc_read_u32(obj);
mbed_official 554:edd95c0879f8 124 return (float)value * (1.0f / (float)ADC_RANGE);
mbed_official 554:edd95c0879f8 125 }