Paul Paterson / mbed-src-CanNucleoF0

mbed library sources, include can_api for nucleo-f091rc

Dependents:   CanNucleoF0_example

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/analogin_api.c@645:13c87cbecd54, 2016-01-07 (annotated)

Committer:
ptpaterson
Date:
Thu Jan 07 05:49:05 2016 +0000
Revision:
645:13c87cbecd54
Parent:
630:825f75ca301e 
corrected freeze on CAN_RECEIVE_IT

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 30:91c1d09ada54 1 /* mbed Microcontroller Library
mbed_official 30:91c1d09ada54 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 30:91c1d09ada54 3 *
mbed_official 30:91c1d09ada54 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 30:91c1d09ada54 5 * you may not use this file except in compliance with the License.
mbed_official 30:91c1d09ada54 6 * You may obtain a copy of the License at
mbed_official 30:91c1d09ada54 7 *
mbed_official 30:91c1d09ada54 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 30:91c1d09ada54 9 *
mbed_official 30:91c1d09ada54 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 30:91c1d09ada54 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 30:91c1d09ada54 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 30:91c1d09ada54 13 * See the License for the specific language governing permissions and
mbed_official 30:91c1d09ada54 14 * limitations under the License.
mbed_official 30:91c1d09ada54 15 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
mbed_official 30:91c1d09ada54 17 #include "analogin_api.h"
mbed_official 30:91c1d09ada54 18 #include "cmsis.h"
mbed_official 30:91c1d09ada54 19 #include "pinmap.h"
mbed_official 285:31249416b6f9 20 #include "mbed_error.h"
mbed_official 30:91c1d09ada54 21
mbed_official 32:4742f6c694e8 22 static const PinMap PinMap_ADC[] = {
mbed_official 32:4742f6c694e8 23 {P0_11, ADC0_0, 2},
mbed_official 32:4742f6c694e8 24 {P1_0 , ADC0_1, 2},
mbed_official 32:4742f6c694e8 25 {P1_1 , ADC0_2, 2},
mbed_official 32:4742f6c694e8 26 {P1_2 , ADC0_3, 2},
mbed_official 32:4742f6c694e8 27 // {P1_3 , ADC0_4, 2}, -- should be mapped to SWDIO only
mbed_official 32:4742f6c694e8 28 {P1_4 , ADC0_5, 1},
mbed_official 32:4742f6c694e8 29 {P1_10, ADC0_6, 1},
mbed_official 32:4742f6c694e8 30 {P1_11, ADC0_7, 1},
mbed_official 32:4742f6c694e8 31 {NC , NC , 0}
mbed_official 32:4742f6c694e8 32 };
mbed_official 30:91c1d09ada54 33
mbed_official 30:91c1d09ada54 34 #define ANALOGIN_MEDIAN_FILTER 1
mbed_official 30:91c1d09ada54 35
mbed_official 30:91c1d09ada54 36 #define ADC_10BIT_RANGE 0x3FF
mbed_official 30:91c1d09ada54 37 #define ADC_12BIT_RANGE 0xFFF
mbed_official 30:91c1d09ada54 38
mbed_official 30:91c1d09ada54 39 static inline int div_round_up(int x, int y) {
mbed_official 30:91c1d09ada54 40 return (x + (y - 1)) / y;
mbed_official 30:91c1d09ada54 41 }
mbed_official 30:91c1d09ada54 42
mbed_official 30:91c1d09ada54 43 #define ADC_RANGE ADC_10BIT_RANGE
mbed_official 30:91c1d09ada54 44
mbed_official 30:91c1d09ada54 45 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 30:91c1d09ada54 46 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 630:825f75ca301e 47 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 30:91c1d09ada54 48
mbed_official 30:91c1d09ada54 49 // Power up ADC
mbed_official 30:91c1d09ada54 50 LPC_SYSCON->PDRUNCFG &= ~ (1 << 4);
mbed_official 30:91c1d09ada54 51 LPC_SYSCON->SYSAHBCLKCTRL |= ((uint32_t)1 << 13);
mbed_official 30:91c1d09ada54 52
mbed_official 30:91c1d09ada54 53 uint32_t offset = (uint32_t)pin & 0xff;
mbed_official 30:91c1d09ada54 54 __IO uint32_t *reg = (__IO uint32_t*)(LPC_IOCON_BASE + offset);
mbed_official 30:91c1d09ada54 55
mbed_official 30:91c1d09ada54 56 // set pin to ADC mode
mbed_official 30:91c1d09ada54 57 *reg &= ~(1 << 7); // set ADMODE = 0 (analog mode)
mbed_official 30:91c1d09ada54 58
mbed_official 30:91c1d09ada54 59 uint32_t PCLK = SystemCoreClock;
mbed_official 30:91c1d09ada54 60 uint32_t MAX_ADC_CLK = 4500000;
mbed_official 30:91c1d09ada54 61 uint32_t clkdiv = div_round_up(PCLK, MAX_ADC_CLK) - 1;
mbed_official 30:91c1d09ada54 62
mbed_official 30:91c1d09ada54 63 LPC_ADC->CR = (0 << 0) // no channels selected
mbed_official 30:91c1d09ada54 64 | (clkdiv << 8) // max of 4.5MHz
mbed_official 30:91c1d09ada54 65 | (0 << 16) // BURST = 0, software controlled
mbed_official 30:91c1d09ada54 66 | ( 0 << 17 ); // CLKS = 0, not applicable
mbed_official 30:91c1d09ada54 67
mbed_official 30:91c1d09ada54 68 pinmap_pinout(pin, PinMap_ADC);
mbed_official 30:91c1d09ada54 69 }
mbed_official 30:91c1d09ada54 70
mbed_official 30:91c1d09ada54 71 static inline uint32_t adc_read(analogin_t *obj) {
mbed_official 30:91c1d09ada54 72 // Select the appropriate channel and start conversion
mbed_official 30:91c1d09ada54 73 LPC_ADC->CR &= ~0xFF;
mbed_official 30:91c1d09ada54 74 LPC_ADC->CR |= 1 << (int)obj->adc;
mbed_official 30:91c1d09ada54 75 LPC_ADC->CR |= 1 << 24;
mbed_official 30:91c1d09ada54 76
mbed_official 30:91c1d09ada54 77 // Repeatedly get the sample data until DONE bit
mbed_official 30:91c1d09ada54 78 unsigned int data;
mbed_official 30:91c1d09ada54 79 do {
mbed_official 30:91c1d09ada54 80 data = LPC_ADC->GDR;
mbed_official 30:91c1d09ada54 81 } while ((data & ((unsigned int)1 << 31)) == 0);
mbed_official 30:91c1d09ada54 82
mbed_official 30:91c1d09ada54 83 // Stop conversion
mbed_official 30:91c1d09ada54 84 LPC_ADC->CR &= ~(1 << 24);
mbed_official 30:91c1d09ada54 85
mbed_official 30:91c1d09ada54 86 return (data >> 6) & ADC_RANGE; // 10 bit
mbed_official 30:91c1d09ada54 87 }
mbed_official 30:91c1d09ada54 88
mbed_official 30:91c1d09ada54 89 static inline void order(uint32_t *a, uint32_t *b) {
mbed_official 30:91c1d09ada54 90 if (*a > *b) {
mbed_official 30:91c1d09ada54 91 uint32_t t = *a;
mbed_official 30:91c1d09ada54 92 *a = *b;
mbed_official 30:91c1d09ada54 93 *b = t;
mbed_official 30:91c1d09ada54 94 }
mbed_official 30:91c1d09ada54 95 }
mbed_official 30:91c1d09ada54 96
mbed_official 30:91c1d09ada54 97 static inline uint32_t adc_read_u32(analogin_t *obj) {
mbed_official 30:91c1d09ada54 98 uint32_t value;
mbed_official 30:91c1d09ada54 99 #if ANALOGIN_MEDIAN_FILTER
mbed_official 30:91c1d09ada54 100 uint32_t v1 = adc_read(obj);
mbed_official 30:91c1d09ada54 101 uint32_t v2 = adc_read(obj);
mbed_official 30:91c1d09ada54 102 uint32_t v3 = adc_read(obj);
mbed_official 30:91c1d09ada54 103 order(&v1, &v2);
mbed_official 30:91c1d09ada54 104 order(&v2, &v3);
mbed_official 30:91c1d09ada54 105 order(&v1, &v2);
mbed_official 30:91c1d09ada54 106 value = v2;
mbed_official 30:91c1d09ada54 107 #else
mbed_official 30:91c1d09ada54 108 value = adc_read(obj);
mbed_official 30:91c1d09ada54 109 #endif
mbed_official 30:91c1d09ada54 110 return value;
mbed_official 30:91c1d09ada54 111 }
mbed_official 30:91c1d09ada54 112
mbed_official 30:91c1d09ada54 113 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 30:91c1d09ada54 114 uint32_t value = adc_read_u32(obj);
mbed_official 30:91c1d09ada54 115
mbed_official 30:91c1d09ada54 116 return (value << 6) | ((value >> 4) & 0x003F); // 10 bit
mbed_official 30:91c1d09ada54 117 }
mbed_official 30:91c1d09ada54 118
mbed_official 30:91c1d09ada54 119 float analogin_read(analogin_t *obj) {
mbed_official 30:91c1d09ada54 120 uint32_t value = adc_read_u32(obj);
mbed_official 30:91c1d09ada54 121 return (float)value * (1.0f / (float)ADC_RANGE);
mbed_official 30:91c1d09ada54 122 }