mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_STM32F4XX/analogin_api.c
- Committer:
- mbed_official
- Date:
- 2014-08-15
- Revision:
- 285:31249416b6f9
- Parent:
- 251:de9a1e4ffd79
File content as of revision 285:31249416b6f9:
/* 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 "mbed_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