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/* 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
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