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@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

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 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 17 #include "analogin_api.h"
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 20 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 #include "adc_iodefine.h"
<> 144:ef7eb2e8f9f7 23 #include "cpg_iodefine.h"
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 #define ANALOGIN_MEDIAN_FILTER 0
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 static const PinMap PinMap_ADC[] = {
<> 144:ef7eb2e8f9f7 28 {P1_8, AN0, 1},
<> 144:ef7eb2e8f9f7 29 {P1_9, AN1, 1},
<> 144:ef7eb2e8f9f7 30 {P1_10, AN2, 1},
<> 144:ef7eb2e8f9f7 31 {P1_11, AN3, 1},
<> 144:ef7eb2e8f9f7 32 {P1_12, AN4, 1},
<> 144:ef7eb2e8f9f7 33 {P1_13, AN5, 1},
<> 144:ef7eb2e8f9f7 34 {P1_14, AN6, 1},
<> 144:ef7eb2e8f9f7 35 {P1_15, AN7, 1},
<> 144:ef7eb2e8f9f7 36 {NC, NC, 0}
<> 144:ef7eb2e8f9f7 37 };
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 static volatile uint16_t *ADCDR[] = {
<> 144:ef7eb2e8f9f7 40 &ADCADDRA,
<> 144:ef7eb2e8f9f7 41 &ADCADDRB,
<> 144:ef7eb2e8f9f7 42 &ADCADDRC,
<> 144:ef7eb2e8f9f7 43 &ADCADDRD,
<> 144:ef7eb2e8f9f7 44 &ADCADDRE,
<> 144:ef7eb2e8f9f7 45 &ADCADDRF,
<> 144:ef7eb2e8f9f7 46 &ADCADDRG,
<> 144:ef7eb2e8f9f7 47 &ADCADDRH,
<> 144:ef7eb2e8f9f7 48 };
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 void analogin_init(analogin_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 51 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
<> 144:ef7eb2e8f9f7 52 MBED_ASSERT(obj->adc != (ADCName)NC);
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 CPGSTBCR3 &= ~(1 << 1);
<> 144:ef7eb2e8f9f7 55 CPGSTBCR6 &= ~(1 << 7);
<> 144:ef7eb2e8f9f7 56
<> 144:ef7eb2e8f9f7 57 // 15: ADF 14: ADIE 13: ADST, [12:9] TRGS..0
<> 144:ef7eb2e8f9f7 58 // [8:6] CKS 010 :: 340tclk
<> 144:ef7eb2e8f9f7 59 // [5:3] MDS 000 :: single mode
<> 144:ef7eb2e8f9f7 60 // [2:0] CH 000 :: AN0
<> 144:ef7eb2e8f9f7 61 ADCADCSR = 0x0080;
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 pinmap_pinout(pin, PinMap_ADC);
<> 144:ef7eb2e8f9f7 64 }
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 static inline uint32_t adc_read(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 67 volatile uint16_t data;
<> 144:ef7eb2e8f9f7 68
<> 144:ef7eb2e8f9f7 69 // Select the appropriate channel and start conversion
<> 144:ef7eb2e8f9f7 70 ADCADCSR &= 0xfff8;
<> 144:ef7eb2e8f9f7 71 ADCADCSR |= (1 << 13 | (obj->adc & 0x7));
<> 144:ef7eb2e8f9f7 72
<> 144:ef7eb2e8f9f7 73 // Wait end of conversion
<> 144:ef7eb2e8f9f7 74 do {
<> 144:ef7eb2e8f9f7 75 data = ADCADCSR;
<> 144:ef7eb2e8f9f7 76 } while (((data & (1 << 15)) == 0) || ((data & (1 << 13)) != 0));
<> 144:ef7eb2e8f9f7 77
<> 144:ef7eb2e8f9f7 78 // clear flag
<> 144:ef7eb2e8f9f7 79 ADCADCSR &= ~(1 << 15);
<> 144:ef7eb2e8f9f7 80
<> 144:ef7eb2e8f9f7 81 return ((*(ADCDR[obj->adc])) >> 4) & 0x0FFF; // 12 bits range
<> 144:ef7eb2e8f9f7 82 }
<> 144:ef7eb2e8f9f7 83
<> 144:ef7eb2e8f9f7 84 #if ANALOGIN_MEDIAN_FILTER
<> 144:ef7eb2e8f9f7 85 static inline void order(uint32_t *a, uint32_t *b) {
<> 144:ef7eb2e8f9f7 86 if (*a > *b) {
<> 144:ef7eb2e8f9f7 87 uint32_t t = *a;
<> 144:ef7eb2e8f9f7 88 *a = *b;
<> 144:ef7eb2e8f9f7 89 *b = t;
<> 144:ef7eb2e8f9f7 90 }
<> 144:ef7eb2e8f9f7 91 }
<> 144:ef7eb2e8f9f7 92 #endif
<> 144:ef7eb2e8f9f7 93
<> 144:ef7eb2e8f9f7 94 static inline uint32_t adc_read_u32(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 95 uint32_t value;
<> 144:ef7eb2e8f9f7 96 #if ANALOGIN_MEDIAN_FILTER
<> 144:ef7eb2e8f9f7 97 uint32_t v1 = adc_read(obj);
<> 144:ef7eb2e8f9f7 98 uint32_t v2 = adc_read(obj);
<> 144:ef7eb2e8f9f7 99 uint32_t v3 = adc_read(obj);
<> 144:ef7eb2e8f9f7 100 order(&v1, &v2);
<> 144:ef7eb2e8f9f7 101 order(&v2, &v3);
<> 144:ef7eb2e8f9f7 102 order(&v1, &v2);
<> 144:ef7eb2e8f9f7 103 value = v2;
<> 144:ef7eb2e8f9f7 104 #else
<> 144:ef7eb2e8f9f7 105 value = adc_read(obj);
<> 144:ef7eb2e8f9f7 106 #endif
<> 144:ef7eb2e8f9f7 107 return value;
<> 144:ef7eb2e8f9f7 108 }
<> 144:ef7eb2e8f9f7 109
<> 144:ef7eb2e8f9f7 110 uint16_t analogin_read_u16(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 111 uint32_t value = adc_read_u32(obj);
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 return (value << 4) | ((value >> 8) & 0x000F); // 12-bit to 16-bit conversion
<> 144:ef7eb2e8f9f7 114 }
<> 144:ef7eb2e8f9f7 115
<> 144:ef7eb2e8f9f7 116 float analogin_read(analogin_t *obj) {
<> 144:ef7eb2e8f9f7 117 uint32_t value = adc_read_u32(obj);
<> 144:ef7eb2e8f9f7 118
<> 144:ef7eb2e8f9f7 119 return (float)value * (1.0f / (float)0x0FFF); // 12 bits range
<> 144:ef7eb2e8f9f7 120 }