mbed library sources
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Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.
Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.
If you are looking for a stable and tested release, please import one of the official mbed library releases:
Import librarymbed
The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
targets/hal/TARGET_STM/TARGET_STM32F4XX/analogin_api.c
- Committer:
- mbed_official
- Date:
- 2014-07-29
- Revision:
- 268:402bcc0c870b
- Parent:
- 251:de9a1e4ffd79
- Child:
- 285:31249416b6f9
File content as of revision 268:402bcc0c870b:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "mbed_assert.h" #include "analogin_api.h" #if DEVICE_ANALOGIN #include "cmsis.h" #include "pinmap.h" #include "error.h" #define ADC_10BIT_RANGE 0x3FF #define ADC_12BIT_RANGE 0xFFF static const PinMap PinMap_ADC[] = { {PA_0, ADC0_0, STM_PIN_DATA(3, 0)}, {PA_1, ADC0_1, STM_PIN_DATA(3, 0)}, {PA_2, ADC0_2, STM_PIN_DATA(3, 0)}, {PA_3, ADC0_3, STM_PIN_DATA(3, 0)}, {PA_4, ADC0_4, STM_PIN_DATA(3, 0)}, {PA_5, ADC0_5, STM_PIN_DATA(3, 0)}, {PA_6, ADC0_6, STM_PIN_DATA(3, 0)}, {PA_7, ADC0_7, STM_PIN_DATA(3, 0)}, {PB_0, ADC0_8, STM_PIN_DATA(3, 0)}, {PB_1, ADC0_9, STM_PIN_DATA(3, 0)}, {PC_0, ADC0_10, STM_PIN_DATA(3, 0)}, {PC_1, ADC0_11, STM_PIN_DATA(3, 0)}, {PC_2, ADC0_12, STM_PIN_DATA(3, 0)}, {PC_3, ADC0_13, STM_PIN_DATA(3, 0)}, {PC_4, ADC0_14, STM_PIN_DATA(3, 0)}, {PC_5, ADC0_15, STM_PIN_DATA(3, 0)}, {NC, NC, 0} }; # define ADC_RANGE ADC_12BIT_RANGE void analogin_init(analogin_t *obj, PinName pin) { obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); MBED_ASSERT(obj->adc != (uint32_t)NC); // ensure power is turned on RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOBEN | RCC_AHB1ENR_GPIOCEN; RCC->APB2ENR |= RCC_APB2ENR_ADC1EN; // Enable the ADC ADC1->CR2 |= ADC_CR2_ADON; pinmap_pinout(pin, PinMap_ADC); } static inline uint32_t adc_read(analogin_t *obj) { // Select the appropriate channel ADC1->SQR3 = (int) obj->adc; // Start conversion ADC1->CR2 |= ADC_CR2_SWSTART; // Wait for conversion to finish while (!(ADC1->SR & ADC_SR_EOC)); uint32_t data = ADC1->DR; return data; // 12 bit } static inline uint32_t adc_read_u32(analogin_t *obj) { uint32_t value; value = adc_read(obj); return value; } uint16_t analogin_read_u16(analogin_t *obj) { uint32_t value = adc_read_u32(obj); return (value << 4) | ((value >> 8) & 0x000F); // 12 bit } float analogin_read(analogin_t *obj) { uint32_t value = adc_read_u32(obj); return (float)value * (1.0f / (float)ADC_RANGE); } #endif