Thomas Lyp / DevLibMemoryController

Initial commit

Dependencies:   FastPWM

mbed-dev-master/targets/TARGET_STM/analogout_api.c@0:bb348c97df44, 2020-09-16 (annotated)

Committer:
lypinator
Date:
Wed Sep 16 01:11:49 2020 +0000
Revision:
0:bb348c97df44
Added PWM

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lypinator 0:bb348c97df44 1 /* mbed Microcontroller Library
lypinator 0:bb348c97df44 2 * Copyright (c) 2017, STMicroelectronics
lypinator 0:bb348c97df44 3 * All rights reserved.
lypinator 0:bb348c97df44 4 *
lypinator 0:bb348c97df44 5 * Redistribution and use in source and binary forms, with or without
lypinator 0:bb348c97df44 6 * modification, are permitted provided that the following conditions are met:
lypinator 0:bb348c97df44 7 *
lypinator 0:bb348c97df44 8 * 1. Redistributions of source code must retain the above copyright notice,
lypinator 0:bb348c97df44 9 * this list of conditions and the following disclaimer.
lypinator 0:bb348c97df44 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
lypinator 0:bb348c97df44 11 * this list of conditions and the following disclaimer in the documentation
lypinator 0:bb348c97df44 12 * and/or other materials provided with the distribution.
lypinator 0:bb348c97df44 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
lypinator 0:bb348c97df44 14 * may be used to endorse or promote products derived from this software
lypinator 0:bb348c97df44 15 * without specific prior written permission.
lypinator 0:bb348c97df44 16 *
lypinator 0:bb348c97df44 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
lypinator 0:bb348c97df44 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
lypinator 0:bb348c97df44 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
lypinator 0:bb348c97df44 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
lypinator 0:bb348c97df44 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
lypinator 0:bb348c97df44 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
lypinator 0:bb348c97df44 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
lypinator 0:bb348c97df44 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
lypinator 0:bb348c97df44 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
lypinator 0:bb348c97df44 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
lypinator 0:bb348c97df44 27 */
lypinator 0:bb348c97df44 28 #include "mbed_assert.h"
lypinator 0:bb348c97df44 29 #include "analogout_api.h"
lypinator 0:bb348c97df44 30
lypinator 0:bb348c97df44 31 #if DEVICE_ANALOGOUT
lypinator 0:bb348c97df44 32
lypinator 0:bb348c97df44 33 #include "cmsis.h"
lypinator 0:bb348c97df44 34 #include "pinmap.h"
lypinator 0:bb348c97df44 35 #include "mbed_error.h"
lypinator 0:bb348c97df44 36 #include "PeripheralPins.h"
lypinator 0:bb348c97df44 37
lypinator 0:bb348c97df44 38 #define DAC_RANGE (0xFFF) // 12 bits
lypinator 0:bb348c97df44 39 #define DAC_NB_BITS (12)
lypinator 0:bb348c97df44 40
lypinator 0:bb348c97df44 41 static inline void dac_write(dac_t *obj, int value)
lypinator 0:bb348c97df44 42 {
lypinator 0:bb348c97df44 43 HAL_DAC_SetValue(&obj->handle, obj->channel, DAC_ALIGN_12B_R, (value & DAC_RANGE));
lypinator 0:bb348c97df44 44 HAL_DAC_Start(&obj->handle, obj->channel);
lypinator 0:bb348c97df44 45 }
lypinator 0:bb348c97df44 46
lypinator 0:bb348c97df44 47 static inline int dac_read(dac_t *obj)
lypinator 0:bb348c97df44 48 {
lypinator 0:bb348c97df44 49 return (int)HAL_DAC_GetValue(&obj->handle, obj->channel);
lypinator 0:bb348c97df44 50 }
lypinator 0:bb348c97df44 51
lypinator 0:bb348c97df44 52 void analogout_write(dac_t *obj, float value)
lypinator 0:bb348c97df44 53 {
lypinator 0:bb348c97df44 54 if (value < 0.0f) {
lypinator 0:bb348c97df44 55 dac_write(obj, 0); // Min value
lypinator 0:bb348c97df44 56 } else if (value > 1.0f) {
lypinator 0:bb348c97df44 57 dac_write(obj, (int)DAC_RANGE); // Max value
lypinator 0:bb348c97df44 58 } else {
lypinator 0:bb348c97df44 59 dac_write(obj, (int)(value * (float)DAC_RANGE));
lypinator 0:bb348c97df44 60 }
lypinator 0:bb348c97df44 61 }
lypinator 0:bb348c97df44 62
lypinator 0:bb348c97df44 63 void analogout_write_u16(dac_t *obj, uint16_t value)
lypinator 0:bb348c97df44 64 {
lypinator 0:bb348c97df44 65 dac_write(obj, value >> (16 - DAC_NB_BITS));
lypinator 0:bb348c97df44 66 }
lypinator 0:bb348c97df44 67
lypinator 0:bb348c97df44 68 float analogout_read(dac_t *obj)
lypinator 0:bb348c97df44 69 {
lypinator 0:bb348c97df44 70 uint32_t value = dac_read(obj);
lypinator 0:bb348c97df44 71 return (float)value * (1.0f / (float)DAC_RANGE);
lypinator 0:bb348c97df44 72 }
lypinator 0:bb348c97df44 73
lypinator 0:bb348c97df44 74 uint16_t analogout_read_u16(dac_t *obj)
lypinator 0:bb348c97df44 75 {
lypinator 0:bb348c97df44 76 uint32_t value = dac_read(obj);
lypinator 0:bb348c97df44 77 return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
lypinator 0:bb348c97df44 78 }
lypinator 0:bb348c97df44 79
lypinator 0:bb348c97df44 80 #endif // DEVICE_ANALOGOUT