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- /* mbed Microcontroller Library
- * Copyright (c) 2017, 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"
- #include "mbed_error.h"
- #include "PeripheralPins.h"
- #define DAC_RANGE (0xFFF) // 12 bits
- #define DAC_NB_BITS (12)
- static inline void dac_write(dac_t *obj, int value)
- {
- HAL_DAC_SetValue(&obj->handle, obj->channel, DAC_ALIGN_12B_R, (value & DAC_RANGE));
- HAL_DAC_Start(&obj->handle, obj->channel);
- }
- static inline int dac_read(dac_t *obj)
- {
- return (int)HAL_DAC_GetValue(&obj->handle, obj->channel);
- }
- 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, (int)DAC_RANGE); // Max value
- } else {
- dac_write(obj, (int)(value * (float)DAC_RANGE));
- }
- }
- void analogout_write_u16(dac_t *obj, uint16_t value)
- {
- dac_write(obj, value >> (16 - DAC_NB_BITS));
- }
- float analogout_read(dac_t *obj)
- {
- uint32_t value = dac_read(obj);
- return (float)value * (1.0f / (float)DAC_RANGE);
- }
- uint16_t analogout_read_u16(dac_t *obj)
- {
- uint32_t value = dac_read(obj);
- return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
- }
- #endif // DEVICE_ANALOGOUT
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