mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_STM/analogout_api.c@181:57724642e740, 2018-02-16 (annotated)

Committer:
AnnaBridge
Date:
Fri Feb 16 16:09:33 2018 +0000
Revision:
181:57724642e740
Parent:
168:9672193075cf 
mbed-dev library. Release version 159.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 168:9672193075cf 1 /* mbed Microcontroller Library
AnnaBridge 168:9672193075cf 2 * Copyright (c) 2017, STMicroelectronics
AnnaBridge 168:9672193075cf 3 * All rights reserved.
AnnaBridge 168:9672193075cf 4 *
AnnaBridge 168:9672193075cf 5 * Redistribution and use in source and binary forms, with or without
AnnaBridge 168:9672193075cf 6 * modification, are permitted provided that the following conditions are met:
AnnaBridge 168:9672193075cf 7 *
AnnaBridge 168:9672193075cf 8 * 1. Redistributions of source code must retain the above copyright notice,
AnnaBridge 168:9672193075cf 9 * this list of conditions and the following disclaimer.
AnnaBridge 168:9672193075cf 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
AnnaBridge 168:9672193075cf 11 * this list of conditions and the following disclaimer in the documentation
AnnaBridge 168:9672193075cf 12 * and/or other materials provided with the distribution.
AnnaBridge 168:9672193075cf 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
AnnaBridge 168:9672193075cf 14 * may be used to endorse or promote products derived from this software
AnnaBridge 168:9672193075cf 15 * without specific prior written permission.
AnnaBridge 168:9672193075cf 16 *
AnnaBridge 168:9672193075cf 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AnnaBridge 168:9672193075cf 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
AnnaBridge 168:9672193075cf 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
AnnaBridge 168:9672193075cf 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
AnnaBridge 168:9672193075cf 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
AnnaBridge 168:9672193075cf 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
AnnaBridge 168:9672193075cf 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
AnnaBridge 168:9672193075cf 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
AnnaBridge 168:9672193075cf 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
AnnaBridge 168:9672193075cf 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
AnnaBridge 168:9672193075cf 27 */
AnnaBridge 168:9672193075cf 28 #include "mbed_assert.h"
AnnaBridge 168:9672193075cf 29 #include "analogout_api.h"
AnnaBridge 168:9672193075cf 30
AnnaBridge 168:9672193075cf 31 #if DEVICE_ANALOGOUT
AnnaBridge 168:9672193075cf 32
AnnaBridge 168:9672193075cf 33 #include "cmsis.h"
AnnaBridge 168:9672193075cf 34 #include "pinmap.h"
AnnaBridge 168:9672193075cf 35 #include "mbed_error.h"
AnnaBridge 168:9672193075cf 36 #include "PeripheralPins.h"
AnnaBridge 168:9672193075cf 37
AnnaBridge 168:9672193075cf 38 #define DAC_RANGE (0xFFF) // 12 bits
AnnaBridge 168:9672193075cf 39 #define DAC_NB_BITS (12)
AnnaBridge 168:9672193075cf 40
AnnaBridge 168:9672193075cf 41 static inline void dac_write(dac_t *obj, int value)
AnnaBridge 168:9672193075cf 42 {
AnnaBridge 168:9672193075cf 43 HAL_DAC_SetValue(&obj->handle, obj->channel, DAC_ALIGN_12B_R, (value & DAC_RANGE));
AnnaBridge 168:9672193075cf 44 HAL_DAC_Start(&obj->handle, obj->channel);
AnnaBridge 168:9672193075cf 45 }
AnnaBridge 168:9672193075cf 46
AnnaBridge 168:9672193075cf 47 static inline int dac_read(dac_t *obj)
AnnaBridge 168:9672193075cf 48 {
AnnaBridge 168:9672193075cf 49 return (int)HAL_DAC_GetValue(&obj->handle, obj->channel);
AnnaBridge 168:9672193075cf 50 }
AnnaBridge 168:9672193075cf 51
AnnaBridge 168:9672193075cf 52 void analogout_write(dac_t *obj, float value)
AnnaBridge 168:9672193075cf 53 {
AnnaBridge 168:9672193075cf 54 if (value < 0.0f) {
AnnaBridge 168:9672193075cf 55 dac_write(obj, 0); // Min value
AnnaBridge 168:9672193075cf 56 } else if (value > 1.0f) {
AnnaBridge 168:9672193075cf 57 dac_write(obj, (int)DAC_RANGE); // Max value
AnnaBridge 168:9672193075cf 58 } else {
AnnaBridge 168:9672193075cf 59 dac_write(obj, (int)(value * (float)DAC_RANGE));
AnnaBridge 168:9672193075cf 60 }
AnnaBridge 168:9672193075cf 61 }
AnnaBridge 168:9672193075cf 62
AnnaBridge 168:9672193075cf 63 void analogout_write_u16(dac_t *obj, uint16_t value)
AnnaBridge 168:9672193075cf 64 {
AnnaBridge 168:9672193075cf 65 dac_write(obj, value >> (16 - DAC_NB_BITS));
AnnaBridge 168:9672193075cf 66 }
AnnaBridge 168:9672193075cf 67
AnnaBridge 168:9672193075cf 68 float analogout_read(dac_t *obj)
AnnaBridge 168:9672193075cf 69 {
AnnaBridge 168:9672193075cf 70 uint32_t value = dac_read(obj);
AnnaBridge 168:9672193075cf 71 return (float)value * (1.0f / (float)DAC_RANGE);
AnnaBridge 168:9672193075cf 72 }
AnnaBridge 168:9672193075cf 73
AnnaBridge 168:9672193075cf 74 uint16_t analogout_read_u16(dac_t *obj)
AnnaBridge 168:9672193075cf 75 {
AnnaBridge 168:9672193075cf 76 uint32_t value = dac_read(obj);
AnnaBridge 168:9672193075cf 77 return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
AnnaBridge 168:9672193075cf 78 }
AnnaBridge 168:9672193075cf 79
AnnaBridge 168:9672193075cf 80 #endif // DEVICE_ANALOGOUT