Thierry Pébayle / mbed-STM32F030K6

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F4XX/analogin_api.c@20:4263a77256ae, 2013-09-10 (annotated)

Committer:
bogdanm
Date:
Tue Sep 10 15:14:19 2013 +0300
Revision:
20:4263a77256ae
Child:
227:7bd0639b8911
Sync with git revision 171dda705c947bf910926a0b73d6a4797802554d

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 20:4263a77256ae 1 /* mbed Microcontroller Library
bogdanm 20:4263a77256ae 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 20:4263a77256ae 3 *
bogdanm 20:4263a77256ae 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 20:4263a77256ae 5 * you may not use this file except in compliance with the License.
bogdanm 20:4263a77256ae 6 * You may obtain a copy of the License at
bogdanm 20:4263a77256ae 7 *
bogdanm 20:4263a77256ae 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 20:4263a77256ae 9 *
bogdanm 20:4263a77256ae 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 20:4263a77256ae 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 20:4263a77256ae 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 20:4263a77256ae 13 * See the License for the specific language governing permissions and
bogdanm 20:4263a77256ae 14 * limitations under the License.
bogdanm 20:4263a77256ae 15 */
bogdanm 20:4263a77256ae 16 #include "analogin_api.h"
bogdanm 20:4263a77256ae 17
bogdanm 20:4263a77256ae 18 #if DEVICE_ANALOGIN
bogdanm 20:4263a77256ae 19
bogdanm 20:4263a77256ae 20 #include "cmsis.h"
bogdanm 20:4263a77256ae 21 #include "pinmap.h"
bogdanm 20:4263a77256ae 22 #include "error.h"
bogdanm 20:4263a77256ae 23
bogdanm 20:4263a77256ae 24 #define ADC_10BIT_RANGE 0x3FF
bogdanm 20:4263a77256ae 25 #define ADC_12BIT_RANGE 0xFFF
bogdanm 20:4263a77256ae 26
bogdanm 20:4263a77256ae 27 static const PinMap PinMap_ADC[] = {
bogdanm 20:4263a77256ae 28 {PA_0, ADC0_0, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 29 {PA_1, ADC0_1, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 30 {PA_2, ADC0_2, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 31 {PA_3, ADC0_3, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 32 {PA_4, ADC0_4, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 33 {PA_5, ADC0_5, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 34 {PA_6, ADC0_6, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 35 {PA_7, ADC0_7, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 36 {PB_0, ADC0_8, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 37 {PB_1, ADC0_9, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 38 {PC_0, ADC0_10, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 39 {PC_1, ADC0_11, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 40 {PC_2, ADC0_12, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 41 {PC_3, ADC0_13, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 42 {PC_4, ADC0_14, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 43 {PC_5, ADC0_15, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 44 {NC, NC, 0}
bogdanm 20:4263a77256ae 45 };
bogdanm 20:4263a77256ae 46
bogdanm 20:4263a77256ae 47 # define ADC_RANGE ADC_12BIT_RANGE
bogdanm 20:4263a77256ae 48
bogdanm 20:4263a77256ae 49 void analogin_init(analogin_t *obj, PinName pin) {
bogdanm 20:4263a77256ae 50 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
bogdanm 20:4263a77256ae 51 if (obj->adc == (uint32_t)NC) {
bogdanm 20:4263a77256ae 52 error("ADC pin mapping failed");
bogdanm 20:4263a77256ae 53 }
bogdanm 20:4263a77256ae 54
bogdanm 20:4263a77256ae 55 // ensure power is turned on
bogdanm 20:4263a77256ae 56 RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOBEN |
bogdanm 20:4263a77256ae 57 RCC_AHB1ENR_GPIOCEN;
bogdanm 20:4263a77256ae 58 RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;
bogdanm 20:4263a77256ae 59
bogdanm 20:4263a77256ae 60 // Enable the ADC
bogdanm 20:4263a77256ae 61 ADC1->CR2 |= ADC_CR2_ADON;
bogdanm 20:4263a77256ae 62
bogdanm 20:4263a77256ae 63 pinmap_pinout(pin, PinMap_ADC);
bogdanm 20:4263a77256ae 64 }
bogdanm 20:4263a77256ae 65
bogdanm 20:4263a77256ae 66 static inline uint32_t adc_read(analogin_t *obj) {
bogdanm 20:4263a77256ae 67 // Select the appropriate channel
bogdanm 20:4263a77256ae 68 ADC1->SQR3 = (int) obj->adc;
bogdanm 20:4263a77256ae 69
bogdanm 20:4263a77256ae 70 // Start conversion
bogdanm 20:4263a77256ae 71 ADC1->CR2 |= ADC_CR2_SWSTART;
bogdanm 20:4263a77256ae 72
bogdanm 20:4263a77256ae 73 // Wait for conversion to finish
bogdanm 20:4263a77256ae 74 while (!(ADC1->SR & ADC_SR_EOC));
bogdanm 20:4263a77256ae 75
bogdanm 20:4263a77256ae 76 uint32_t data = ADC1->DR;
bogdanm 20:4263a77256ae 77 return data; // 12 bit
bogdanm 20:4263a77256ae 78 }
bogdanm 20:4263a77256ae 79
bogdanm 20:4263a77256ae 80 static inline uint32_t adc_read_u32(analogin_t *obj) {
bogdanm 20:4263a77256ae 81 uint32_t value;
bogdanm 20:4263a77256ae 82 value = adc_read(obj);
bogdanm 20:4263a77256ae 83 return value;
bogdanm 20:4263a77256ae 84 }
bogdanm 20:4263a77256ae 85
bogdanm 20:4263a77256ae 86 uint16_t analogin_read_u16(analogin_t *obj) {
bogdanm 20:4263a77256ae 87 uint32_t value = adc_read_u32(obj);
bogdanm 20:4263a77256ae 88
bogdanm 20:4263a77256ae 89 return (value << 4) | ((value >> 8) & 0x000F); // 12 bit
bogdanm 20:4263a77256ae 90 }
bogdanm 20:4263a77256ae 91
bogdanm 20:4263a77256ae 92 float analogin_read(analogin_t *obj) {
bogdanm 20:4263a77256ae 93 uint32_t value = adc_read_u32(obj);
bogdanm 20:4263a77256ae 94 return (float)value * (1.0f / (float)ADC_RANGE);
bogdanm 20:4263a77256ae 95 }
bogdanm 20:4263a77256ae 96
bogdanm 20:4263a77256ae 97 #endif