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80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2017, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "mbed_assert.h"
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#include "analogout_api.h"
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#if DEVICE_ANALOGOUT
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#include "cmsis.h"
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#include "pinmap.h"
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#include "mbed_error.h"
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#include "PeripheralPins.h"
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#define DAC_RANGE (0xFFF) // 12 bits
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#define DAC_NB_BITS (12)
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static inline void dac_write(dac_t *obj, int value)
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{
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HAL_DAC_SetValue(&obj->handle, obj->channel, DAC_ALIGN_12B_R, (value & DAC_RANGE));
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}
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static inline int dac_read(dac_t *obj)
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{
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return (int)HAL_DAC_GetValue(&obj->handle, obj->channel);
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}
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void analogout_write(dac_t *obj, float value)
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{
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if (value < 0.0f) {
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dac_write(obj, 0); // Min value
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} else if (value > 1.0f) {
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dac_write(obj, (int)DAC_RANGE); // Max value
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} else {
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dac_write(obj, (int)(value * (float)DAC_RANGE));
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}
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}
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void analogout_write_u16(dac_t *obj, uint16_t value)
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{
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dac_write(obj, value >> (16 - DAC_NB_BITS));
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}
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float analogout_read(dac_t *obj)
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{
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uint32_t value = dac_read(obj);
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return (float)value * (1.0f / (float)DAC_RANGE);
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}
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uint16_t analogout_read_u16(dac_t *obj)
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{
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uint32_t value = dac_read(obj);
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return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
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}
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#endif // DEVICE_ANALOGOUT
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