Marco Zecchini / Mbed OS Example_RTOS

Rtos API example

mbed-os/targets/TARGET_STM/analogout_api.c@0:9fca2b23d0ba, 2019-02-23 (annotated)

Committer:
marcozecchini
Date:
Sat Feb 23 12:13:36 2019 +0000
Revision:
0:9fca2b23d0ba
final commit

Who changed what in which revision?

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marcozecchini 0:9fca2b23d0ba 1 /* mbed Microcontroller Library
marcozecchini 0:9fca2b23d0ba 2 * Copyright (c) 2017, STMicroelectronics
marcozecchini 0:9fca2b23d0ba 3 * All rights reserved.
marcozecchini 0:9fca2b23d0ba 4 *
marcozecchini 0:9fca2b23d0ba 5 * Redistribution and use in source and binary forms, with or without
marcozecchini 0:9fca2b23d0ba 6 * modification, are permitted provided that the following conditions are met:
marcozecchini 0:9fca2b23d0ba 7 *
marcozecchini 0:9fca2b23d0ba 8 * 1. Redistributions of source code must retain the above copyright notice,
marcozecchini 0:9fca2b23d0ba 9 * this list of conditions and the following disclaimer.
marcozecchini 0:9fca2b23d0ba 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
marcozecchini 0:9fca2b23d0ba 11 * this list of conditions and the following disclaimer in the documentation
marcozecchini 0:9fca2b23d0ba 12 * and/or other materials provided with the distribution.
marcozecchini 0:9fca2b23d0ba 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
marcozecchini 0:9fca2b23d0ba 14 * may be used to endorse or promote products derived from this software
marcozecchini 0:9fca2b23d0ba 15 * without specific prior written permission.
marcozecchini 0:9fca2b23d0ba 16 *
marcozecchini 0:9fca2b23d0ba 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
marcozecchini 0:9fca2b23d0ba 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
marcozecchini 0:9fca2b23d0ba 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
marcozecchini 0:9fca2b23d0ba 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
marcozecchini 0:9fca2b23d0ba 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
marcozecchini 0:9fca2b23d0ba 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
marcozecchini 0:9fca2b23d0ba 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
marcozecchini 0:9fca2b23d0ba 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
marcozecchini 0:9fca2b23d0ba 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
marcozecchini 0:9fca2b23d0ba 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
marcozecchini 0:9fca2b23d0ba 27 */
marcozecchini 0:9fca2b23d0ba 28 #include "mbed_assert.h"
marcozecchini 0:9fca2b23d0ba 29 #include "analogout_api.h"
marcozecchini 0:9fca2b23d0ba 30
marcozecchini 0:9fca2b23d0ba 31 #if DEVICE_ANALOGOUT
marcozecchini 0:9fca2b23d0ba 32
marcozecchini 0:9fca2b23d0ba 33 #include "cmsis.h"
marcozecchini 0:9fca2b23d0ba 34 #include "pinmap.h"
marcozecchini 0:9fca2b23d0ba 35 #include "mbed_error.h"
marcozecchini 0:9fca2b23d0ba 36 #include "PeripheralPins.h"
marcozecchini 0:9fca2b23d0ba 37
marcozecchini 0:9fca2b23d0ba 38 #define DAC_RANGE (0xFFF) // 12 bits
marcozecchini 0:9fca2b23d0ba 39 #define DAC_NB_BITS (12)
marcozecchini 0:9fca2b23d0ba 40
marcozecchini 0:9fca2b23d0ba 41 static inline void dac_write(dac_t *obj, int value)
marcozecchini 0:9fca2b23d0ba 42 {
marcozecchini 0:9fca2b23d0ba 43 HAL_DAC_SetValue(&obj->handle, obj->channel, DAC_ALIGN_12B_R, (value & DAC_RANGE));
marcozecchini 0:9fca2b23d0ba 44 HAL_DAC_Start(&obj->handle, obj->channel);
marcozecchini 0:9fca2b23d0ba 45 }
marcozecchini 0:9fca2b23d0ba 46
marcozecchini 0:9fca2b23d0ba 47 static inline int dac_read(dac_t *obj)
marcozecchini 0:9fca2b23d0ba 48 {
marcozecchini 0:9fca2b23d0ba 49 return (int)HAL_DAC_GetValue(&obj->handle, obj->channel);
marcozecchini 0:9fca2b23d0ba 50 }
marcozecchini 0:9fca2b23d0ba 51
marcozecchini 0:9fca2b23d0ba 52 void analogout_write(dac_t *obj, float value)
marcozecchini 0:9fca2b23d0ba 53 {
marcozecchini 0:9fca2b23d0ba 54 if (value < 0.0f) {
marcozecchini 0:9fca2b23d0ba 55 dac_write(obj, 0); // Min value
marcozecchini 0:9fca2b23d0ba 56 } else if (value > 1.0f) {
marcozecchini 0:9fca2b23d0ba 57 dac_write(obj, (int)DAC_RANGE); // Max value
marcozecchini 0:9fca2b23d0ba 58 } else {
marcozecchini 0:9fca2b23d0ba 59 dac_write(obj, (int)(value * (float)DAC_RANGE));
marcozecchini 0:9fca2b23d0ba 60 }
marcozecchini 0:9fca2b23d0ba 61 }
marcozecchini 0:9fca2b23d0ba 62
marcozecchini 0:9fca2b23d0ba 63 void analogout_write_u16(dac_t *obj, uint16_t value)
marcozecchini 0:9fca2b23d0ba 64 {
marcozecchini 0:9fca2b23d0ba 65 dac_write(obj, value >> (16 - DAC_NB_BITS));
marcozecchini 0:9fca2b23d0ba 66 }
marcozecchini 0:9fca2b23d0ba 67
marcozecchini 0:9fca2b23d0ba 68 float analogout_read(dac_t *obj)
marcozecchini 0:9fca2b23d0ba 69 {
marcozecchini 0:9fca2b23d0ba 70 uint32_t value = dac_read(obj);
marcozecchini 0:9fca2b23d0ba 71 return (float)value * (1.0f / (float)DAC_RANGE);
marcozecchini 0:9fca2b23d0ba 72 }
marcozecchini 0:9fca2b23d0ba 73
marcozecchini 0:9fca2b23d0ba 74 uint16_t analogout_read_u16(dac_t *obj)
marcozecchini 0:9fca2b23d0ba 75 {
marcozecchini 0:9fca2b23d0ba 76 uint32_t value = dac_read(obj);
marcozecchini 0:9fca2b23d0ba 77 return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
marcozecchini 0:9fca2b23d0ba 78 }
marcozecchini 0:9fca2b23d0ba 79
marcozecchini 0:9fca2b23d0ba 80 #endif // DEVICE_ANALOGOUT