shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F4XX/analogin_api.c@250:a49055e7a707, 2014-07-08 (annotated)

Committer:
mbed_official
Date:
Tue Jul 08 11:15:08 2014 +0100
Revision:
250:a49055e7a707
Parent:
227:7bd0639b8911
Child:
251:de9a1e4ffd79
Synchronized with git revision 3197042b65f8d28e856e1a7812d45e2fbe80e3f1



Full URL: https://github.com/mbedmicro/mbed/commit/3197042b65f8d28e856e1a7812d45e2fbe80e3f1/



error.h -> mbed_error.h

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 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
bogdanm 20:4263a77256ae 17 #include "analogin_api.h"
bogdanm 20:4263a77256ae 18
bogdanm 20:4263a77256ae 19 #if DEVICE_ANALOGIN
bogdanm 20:4263a77256ae 20
bogdanm 20:4263a77256ae 21 #include "cmsis.h"
bogdanm 20:4263a77256ae 22 #include "pinmap.h"
mbed_official 250:a49055e7a707 23 #include "mbed_error.h"
bogdanm 20:4263a77256ae 24
bogdanm 20:4263a77256ae 25 #define ADC_10BIT_RANGE 0x3FF
bogdanm 20:4263a77256ae 26 #define ADC_12BIT_RANGE 0xFFF
bogdanm 20:4263a77256ae 27
bogdanm 20:4263a77256ae 28 static const PinMap PinMap_ADC[] = {
bogdanm 20:4263a77256ae 29 {PA_0, ADC0_0, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 30 {PA_1, ADC0_1, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 31 {PA_2, ADC0_2, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 32 {PA_3, ADC0_3, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 33 {PA_4, ADC0_4, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 34 {PA_5, ADC0_5, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 35 {PA_6, ADC0_6, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 36 {PA_7, ADC0_7, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 37 {PB_0, ADC0_8, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 38 {PB_1, ADC0_9, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 39 {PC_0, ADC0_10, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 40 {PC_1, ADC0_11, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 41 {PC_2, ADC0_12, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 42 {PC_3, ADC0_13, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 43 {PC_4, ADC0_14, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 44 {PC_5, ADC0_15, STM_PIN_DATA(3, 0)},
bogdanm 20:4263a77256ae 45 {NC, NC, 0}
bogdanm 20:4263a77256ae 46 };
bogdanm 20:4263a77256ae 47
bogdanm 20:4263a77256ae 48 # define ADC_RANGE ADC_12BIT_RANGE
bogdanm 20:4263a77256ae 49
bogdanm 20:4263a77256ae 50 void analogin_init(analogin_t *obj, PinName pin) {
bogdanm 20:4263a77256ae 51 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 227:7bd0639b8911 52 MBED_ASSERT(obj->adc != (uint32_t)NC);
bogdanm 20:4263a77256ae 53
bogdanm 20:4263a77256ae 54 // ensure power is turned on
bogdanm 20:4263a77256ae 55 RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOBEN |
bogdanm 20:4263a77256ae 56 RCC_AHB1ENR_GPIOCEN;
bogdanm 20:4263a77256ae 57 RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;
bogdanm 20:4263a77256ae 58
bogdanm 20:4263a77256ae 59 // Enable the ADC
bogdanm 20:4263a77256ae 60 ADC1->CR2 |= ADC_CR2_ADON;
bogdanm 20:4263a77256ae 61
bogdanm 20:4263a77256ae 62 pinmap_pinout(pin, PinMap_ADC);
bogdanm 20:4263a77256ae 63 }
bogdanm 20:4263a77256ae 64
bogdanm 20:4263a77256ae 65 static inline uint32_t adc_read(analogin_t *obj) {
bogdanm 20:4263a77256ae 66 // Select the appropriate channel
bogdanm 20:4263a77256ae 67 ADC1->SQR3 = (int) obj->adc;
bogdanm 20:4263a77256ae 68
bogdanm 20:4263a77256ae 69 // Start conversion
bogdanm 20:4263a77256ae 70 ADC1->CR2 |= ADC_CR2_SWSTART;
bogdanm 20:4263a77256ae 71
bogdanm 20:4263a77256ae 72 // Wait for conversion to finish
bogdanm 20:4263a77256ae 73 while (!(ADC1->SR & ADC_SR_EOC));
bogdanm 20:4263a77256ae 74
bogdanm 20:4263a77256ae 75 uint32_t data = ADC1->DR;
bogdanm 20:4263a77256ae 76 return data; // 12 bit
bogdanm 20:4263a77256ae 77 }
bogdanm 20:4263a77256ae 78
bogdanm 20:4263a77256ae 79 static inline uint32_t adc_read_u32(analogin_t *obj) {
bogdanm 20:4263a77256ae 80 uint32_t value;
bogdanm 20:4263a77256ae 81 value = adc_read(obj);
bogdanm 20:4263a77256ae 82 return value;
bogdanm 20:4263a77256ae 83 }
bogdanm 20:4263a77256ae 84
bogdanm 20:4263a77256ae 85 uint16_t analogin_read_u16(analogin_t *obj) {
bogdanm 20:4263a77256ae 86 uint32_t value = adc_read_u32(obj);
bogdanm 20:4263a77256ae 87
bogdanm 20:4263a77256ae 88 return (value << 4) | ((value >> 8) & 0x000F); // 12 bit
bogdanm 20:4263a77256ae 89 }
bogdanm 20:4263a77256ae 90
bogdanm 20:4263a77256ae 91 float analogin_read(analogin_t *obj) {
bogdanm 20:4263a77256ae 92 uint32_t value = adc_read_u32(obj);
bogdanm 20:4263a77256ae 93 return (float)value * (1.0f / (float)ADC_RANGE);
bogdanm 20:4263a77256ae 94 }
bogdanm 20:4263a77256ae 95
bogdanm 20:4263a77256ae 96 #endif