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/* mbed Microcontroller Library
* Copyright (c) 2014, STMicroelectronics
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "mbed_assert.h"
#include "analogout_api.h"
#if DEVICE_ANALOGOUT
#include "cmsis.h"
#include "pinmap.h"
#define RANGE_12BIT (0xFFF)
static const PinMap PinMap_DAC[] = {
{PA_4, DAC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // DAC_OUT1
{NC, NC, 0}
};
void analogout_init(dac_t *obj, PinName pin) {
DAC_TypeDef *dac;
DAC_InitTypeDef DAC_InitStructure;
// Get the peripheral name (DAC_1, ...) from the pin and assign it to the object
obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
MBED_ASSERT(obj->dac == (DACName)NC);
dac = (DAC_TypeDef *)(obj->dac);
// Configure GPIO
pinmap_pinout(pin, PinMap_DAC);
// Save the channel for the write and read functions
obj->channel = pin;
// Enable DAC clock
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
// Configure and enable DAC channel
DAC_StructInit(&DAC_InitStructure);
DAC_Init(dac, DAC_Channel_1, &DAC_InitStructure);
DAC_Cmd(dac, DAC_Channel_1, ENABLE);
analogout_write_u16(obj, 0);
}
void analogout_free(dac_t *obj) {
}
static inline void dac_write(dac_t *obj, uint16_t value) {
DAC_TypeDef *dac = (DAC_TypeDef *)(obj->dac);
DAC_SetChannel1Data(dac, DAC_Align_12b_R, value);
}
static inline int dac_read(dac_t *obj) {
DAC_TypeDef *dac = (DAC_TypeDef *)(obj->dac);
return (int)DAC_GetDataOutputValue(dac, DAC_Channel_1);
}
void analogout_write(dac_t *obj, float value) {
if (value < 0.0f) {
dac_write(obj, 0); // Min value
} else if (value > 1.0f) {
dac_write(obj, (uint16_t)RANGE_12BIT); // Max value
} else {
dac_write(obj, (uint16_t)(value * (float)RANGE_12BIT));
}
}
void analogout_write_u16(dac_t *obj, uint16_t value) {
if (value > (uint16_t)RANGE_12BIT) {
dac_write(obj, (uint16_t)RANGE_12BIT); // Max value
} else {
dac_write(obj, value);
}
}
float analogout_read(dac_t *obj) {
uint32_t value = dac_read(obj);
return (float)value * (1.0f / (float)RANGE_12BIT);
}
uint16_t analogout_read_u16(dac_t *obj) {
return (uint16_t)dac_read(obj);
}
#endif // DEVICE_ANALOGOUT
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