Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_RENESAS/TARGET_RZ_A1H/analogin_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
77:78ca4485fc41
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 17 #include "analogin_api.h"
bogdanm 0:9b334a45a8ff 18
bogdanm 0:9b334a45a8ff 19 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 20 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 21
bogdanm 0:9b334a45a8ff 22 #include "adc_iodefine.h"
bogdanm 0:9b334a45a8ff 23 #include "cpg_iodefine.h"
bogdanm 0:9b334a45a8ff 24
bogdanm 0:9b334a45a8ff 25 #define ANALOGIN_MEDIAN_FILTER 0
bogdanm 0:9b334a45a8ff 26
bogdanm 0:9b334a45a8ff 27 static const PinMap PinMap_ADC[] = {
bogdanm 0:9b334a45a8ff 28 {P1_8, AN0, 1},
bogdanm 0:9b334a45a8ff 29 {P1_9, AN1, 1},
bogdanm 0:9b334a45a8ff 30 {P1_10, AN2, 1},
bogdanm 0:9b334a45a8ff 31 {P1_11, AN3, 1},
bogdanm 0:9b334a45a8ff 32 {P1_12, AN3, 1},
bogdanm 0:9b334a45a8ff 33 {P1_13, AN5, 1},
bogdanm 0:9b334a45a8ff 34 {P1_14, AN5, 1},
bogdanm 0:9b334a45a8ff 35 {P1_15, AN7, 1},
bogdanm 0:9b334a45a8ff 36 {NC, NC, 0}
bogdanm 0:9b334a45a8ff 37 };
bogdanm 0:9b334a45a8ff 38
bogdanm 0:9b334a45a8ff 39 static volatile uint16_t *ADCDR[] = {
bogdanm 0:9b334a45a8ff 40 &ADCADDRA,
bogdanm 0:9b334a45a8ff 41 &ADCADDRB,
bogdanm 0:9b334a45a8ff 42 &ADCADDRC,
bogdanm 0:9b334a45a8ff 43 &ADCADDRD,
bogdanm 0:9b334a45a8ff 44 &ADCADDRE,
bogdanm 0:9b334a45a8ff 45 &ADCADDRF,
bogdanm 0:9b334a45a8ff 46 &ADCADDRG,
bogdanm 0:9b334a45a8ff 47 &ADCADDRH,
bogdanm 0:9b334a45a8ff 48 };
bogdanm 0:9b334a45a8ff 49
bogdanm 0:9b334a45a8ff 50 void analogin_init(analogin_t *obj, PinName pin) {
bogdanm 0:9b334a45a8ff 51 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
bogdanm 0:9b334a45a8ff 52 MBED_ASSERT(obj->adc != (ADCName)NC);
bogdanm 0:9b334a45a8ff 53
bogdanm 0:9b334a45a8ff 54 CPGSTBCR3 &= ~(1 << 1);
bogdanm 0:9b334a45a8ff 55 CPGSTBCR6 &= ~(1 << 7);
bogdanm 0:9b334a45a8ff 56
bogdanm 0:9b334a45a8ff 57 // 15: ADF 14: ADIE 13: ADST, [12:9] TRGS..0
bogdanm 0:9b334a45a8ff 58 // [8:6] CKS 010 :: 340tclk
bogdanm 0:9b334a45a8ff 59 // [5:3] MDS 000 :: single mode
bogdanm 0:9b334a45a8ff 60 // [2:0] CH 000 :: AN0
bogdanm 0:9b334a45a8ff 61 ADCADCSR = 0x0080;
bogdanm 0:9b334a45a8ff 62
bogdanm 0:9b334a45a8ff 63 pinmap_pinout(pin, PinMap_ADC);
bogdanm 0:9b334a45a8ff 64 }
bogdanm 0:9b334a45a8ff 65
bogdanm 0:9b334a45a8ff 66 static inline uint32_t adc_read(analogin_t *obj) {
bogdanm 0:9b334a45a8ff 67 volatile uint16_t data;
bogdanm 0:9b334a45a8ff 68
bogdanm 0:9b334a45a8ff 69 // Select the appropriate channel and start conversion
bogdanm 0:9b334a45a8ff 70 ADCADCSR &= 0xfff8;
bogdanm 0:9b334a45a8ff 71 ADCADCSR |= (1 << 13 | (obj->adc & 0x7));
bogdanm 0:9b334a45a8ff 72
bogdanm 0:9b334a45a8ff 73 // Wait end of conversion
bogdanm 0:9b334a45a8ff 74 do {
bogdanm 0:9b334a45a8ff 75 data = ADCADCSR;
bogdanm 0:9b334a45a8ff 76 } while (((data & (1 << 15)) == 0) || ((data & (1 << 13)) != 0));
bogdanm 0:9b334a45a8ff 77
bogdanm 0:9b334a45a8ff 78 // clear flag
bogdanm 0:9b334a45a8ff 79 ADCADCSR &= ~(1 << 15);
bogdanm 0:9b334a45a8ff 80
bogdanm 0:9b334a45a8ff 81 return ((*(ADCDR[obj->adc])) >> 4) & 0x0FFF; // 12 bits range
bogdanm 0:9b334a45a8ff 82 }
bogdanm 0:9b334a45a8ff 83
bogdanm 0:9b334a45a8ff 84 #if ANALOGIN_MEDIAN_FILTER
bogdanm 0:9b334a45a8ff 85 static inline void order(uint32_t *a, uint32_t *b) {
bogdanm 0:9b334a45a8ff 86 if (*a > *b) {
bogdanm 0:9b334a45a8ff 87 uint32_t t = *a;
bogdanm 0:9b334a45a8ff 88 *a = *b;
bogdanm 0:9b334a45a8ff 89 *b = t;
bogdanm 0:9b334a45a8ff 90 }
bogdanm 0:9b334a45a8ff 91 }
bogdanm 0:9b334a45a8ff 92 #endif
bogdanm 0:9b334a45a8ff 93
bogdanm 0:9b334a45a8ff 94 static inline uint32_t adc_read_u32(analogin_t *obj) {
bogdanm 0:9b334a45a8ff 95 uint32_t value;
bogdanm 0:9b334a45a8ff 96 #if ANALOGIN_MEDIAN_FILTER
bogdanm 0:9b334a45a8ff 97 uint32_t v1 = adc_read(obj);
bogdanm 0:9b334a45a8ff 98 uint32_t v2 = adc_read(obj);
bogdanm 0:9b334a45a8ff 99 uint32_t v3 = adc_read(obj);
bogdanm 0:9b334a45a8ff 100 order(&v1, &v2);
bogdanm 0:9b334a45a8ff 101 order(&v2, &v3);
bogdanm 0:9b334a45a8ff 102 order(&v1, &v2);
bogdanm 0:9b334a45a8ff 103 value = v2;
bogdanm 0:9b334a45a8ff 104 #else
bogdanm 0:9b334a45a8ff 105 value = adc_read(obj);
bogdanm 0:9b334a45a8ff 106 #endif
bogdanm 0:9b334a45a8ff 107 return value;
bogdanm 0:9b334a45a8ff 108 }
bogdanm 0:9b334a45a8ff 109
bogdanm 0:9b334a45a8ff 110 uint16_t analogin_read_u16(analogin_t *obj) {
bogdanm 0:9b334a45a8ff 111 uint32_t value = adc_read_u32(obj);
bogdanm 0:9b334a45a8ff 112
bogdanm 0:9b334a45a8ff 113 return (value << 4) | ((value >> 8) & 0x000F); // 12-bit to 16-bit conversion
bogdanm 0:9b334a45a8ff 114 }
bogdanm 0:9b334a45a8ff 115
bogdanm 0:9b334a45a8ff 116 float analogin_read(analogin_t *obj) {
bogdanm 0:9b334a45a8ff 117 uint32_t value = adc_read_u32(obj);
bogdanm 0:9b334a45a8ff 118
bogdanm 0:9b334a45a8ff 119 return (float)value * (1.0f / (float)0x0FFF); // 12 bits range
bogdanm 0:9b334a45a8ff 120 }