EL4121 Embedded System / mbed-os

mbed-os

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

targets/TARGET_STM/analogout_api.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /* mbed Microcontroller Library
be_bryan 0:b74591d5ab33 2 * Copyright (c) 2017, STMicroelectronics
be_bryan 0:b74591d5ab33 3 * All rights reserved.
be_bryan 0:b74591d5ab33 4 *
be_bryan 0:b74591d5ab33 5 * Redistribution and use in source and binary forms, with or without
be_bryan 0:b74591d5ab33 6 * modification, are permitted provided that the following conditions are met:
be_bryan 0:b74591d5ab33 7 *
be_bryan 0:b74591d5ab33 8 * 1. Redistributions of source code must retain the above copyright notice,
be_bryan 0:b74591d5ab33 9 * this list of conditions and the following disclaimer.
be_bryan 0:b74591d5ab33 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
be_bryan 0:b74591d5ab33 11 * this list of conditions and the following disclaimer in the documentation
be_bryan 0:b74591d5ab33 12 * and/or other materials provided with the distribution.
be_bryan 0:b74591d5ab33 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
be_bryan 0:b74591d5ab33 14 * may be used to endorse or promote products derived from this software
be_bryan 0:b74591d5ab33 15 * without specific prior written permission.
be_bryan 0:b74591d5ab33 16 *
be_bryan 0:b74591d5ab33 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
be_bryan 0:b74591d5ab33 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
be_bryan 0:b74591d5ab33 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
be_bryan 0:b74591d5ab33 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
be_bryan 0:b74591d5ab33 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
be_bryan 0:b74591d5ab33 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
be_bryan 0:b74591d5ab33 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
be_bryan 0:b74591d5ab33 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
be_bryan 0:b74591d5ab33 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
be_bryan 0:b74591d5ab33 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
be_bryan 0:b74591d5ab33 27 */
be_bryan 0:b74591d5ab33 28 #include "mbed_assert.h"
be_bryan 0:b74591d5ab33 29 #include "analogout_api.h"
be_bryan 0:b74591d5ab33 30
be_bryan 0:b74591d5ab33 31 #if DEVICE_ANALOGOUT
be_bryan 0:b74591d5ab33 32
be_bryan 0:b74591d5ab33 33 #include "cmsis.h"
be_bryan 0:b74591d5ab33 34 #include "pinmap.h"
be_bryan 0:b74591d5ab33 35 #include "mbed_error.h"
be_bryan 0:b74591d5ab33 36 #include "PeripheralPins.h"
be_bryan 0:b74591d5ab33 37
be_bryan 0:b74591d5ab33 38 #define DAC_RANGE (0xFFF) // 12 bits
be_bryan 0:b74591d5ab33 39 #define DAC_NB_BITS (12)
be_bryan 0:b74591d5ab33 40
be_bryan 0:b74591d5ab33 41 static inline void dac_write(dac_t *obj, int value)
be_bryan 0:b74591d5ab33 42 {
be_bryan 0:b74591d5ab33 43 HAL_DAC_SetValue(&obj->handle, obj->channel, DAC_ALIGN_12B_R, (value & DAC_RANGE));
be_bryan 0:b74591d5ab33 44 HAL_DAC_Start(&obj->handle, obj->channel);
be_bryan 0:b74591d5ab33 45 }
be_bryan 0:b74591d5ab33 46
be_bryan 0:b74591d5ab33 47 static inline int dac_read(dac_t *obj)
be_bryan 0:b74591d5ab33 48 {
be_bryan 0:b74591d5ab33 49 return (int)HAL_DAC_GetValue(&obj->handle, obj->channel);
be_bryan 0:b74591d5ab33 50 }
be_bryan 0:b74591d5ab33 51
be_bryan 0:b74591d5ab33 52 void analogout_write(dac_t *obj, float value)
be_bryan 0:b74591d5ab33 53 {
be_bryan 0:b74591d5ab33 54 if (value < 0.0f) {
be_bryan 0:b74591d5ab33 55 dac_write(obj, 0); // Min value
be_bryan 0:b74591d5ab33 56 } else if (value > 1.0f) {
be_bryan 0:b74591d5ab33 57 dac_write(obj, (int)DAC_RANGE); // Max value
be_bryan 0:b74591d5ab33 58 } else {
be_bryan 0:b74591d5ab33 59 dac_write(obj, (int)(value * (float)DAC_RANGE));
be_bryan 0:b74591d5ab33 60 }
be_bryan 0:b74591d5ab33 61 }
be_bryan 0:b74591d5ab33 62
be_bryan 0:b74591d5ab33 63 void analogout_write_u16(dac_t *obj, uint16_t value)
be_bryan 0:b74591d5ab33 64 {
be_bryan 0:b74591d5ab33 65 dac_write(obj, value >> (16 - DAC_NB_BITS));
be_bryan 0:b74591d5ab33 66 }
be_bryan 0:b74591d5ab33 67
be_bryan 0:b74591d5ab33 68 float analogout_read(dac_t *obj)
be_bryan 0:b74591d5ab33 69 {
be_bryan 0:b74591d5ab33 70 uint32_t value = dac_read(obj);
be_bryan 0:b74591d5ab33 71 return (float)value * (1.0f / (float)DAC_RANGE);
be_bryan 0:b74591d5ab33 72 }
be_bryan 0:b74591d5ab33 73
be_bryan 0:b74591d5ab33 74 uint16_t analogout_read_u16(dac_t *obj)
be_bryan 0:b74591d5ab33 75 {
be_bryan 0:b74591d5ab33 76 uint32_t value = dac_read(obj);
be_bryan 0:b74591d5ab33 77 return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
be_bryan 0:b74591d5ab33 78 }
be_bryan 0:b74591d5ab33 79
be_bryan 0:b74591d5ab33 80 #endif // DEVICE_ANALOGOUT