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

Committer:
AnnaBridge
Date:
Fri Feb 16 16:09:33 2018 +0000
Revision:
181:57724642e740
Parent:
180:96ed750bd169
Child:
189:f392fc9709a3
mbed-dev library. Release version 159.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 180:96ed750bd169 1 /* mbed Microcontroller Library
Anna Bridge 180:96ed750bd169 2 * Copyright (c) 2017, STMicroelectronics
Anna Bridge 180:96ed750bd169 3 * All rights reserved.
Anna Bridge 180:96ed750bd169 4 *
Anna Bridge 180:96ed750bd169 5 * Redistribution and use in source and binary forms, with or without
Anna Bridge 180:96ed750bd169 6 * modification, are permitted provided that the following conditions are met:
Anna Bridge 180:96ed750bd169 7 *
Anna Bridge 180:96ed750bd169 8 * 1. Redistributions of source code must retain the above copyright notice,
Anna Bridge 180:96ed750bd169 9 * this list of conditions and the following disclaimer.
Anna Bridge 180:96ed750bd169 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
Anna Bridge 180:96ed750bd169 11 * this list of conditions and the following disclaimer in the documentation
Anna Bridge 180:96ed750bd169 12 * and/or other materials provided with the distribution.
Anna Bridge 180:96ed750bd169 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
Anna Bridge 180:96ed750bd169 14 * may be used to endorse or promote products derived from this software
Anna Bridge 180:96ed750bd169 15 * without specific prior written permission.
Anna Bridge 180:96ed750bd169 16 *
Anna Bridge 180:96ed750bd169 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Anna Bridge 180:96ed750bd169 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Anna Bridge 180:96ed750bd169 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
Anna Bridge 180:96ed750bd169 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
Anna Bridge 180:96ed750bd169 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
Anna Bridge 180:96ed750bd169 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
Anna Bridge 180:96ed750bd169 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
Anna Bridge 180:96ed750bd169 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
Anna Bridge 180:96ed750bd169 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
Anna Bridge 180:96ed750bd169 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Anna Bridge 180:96ed750bd169 27 */
Anna Bridge 180:96ed750bd169 28 #include "analogin_api.h"
Anna Bridge 180:96ed750bd169 29
Anna Bridge 180:96ed750bd169 30 #if DEVICE_ANALOGIN
Anna Bridge 180:96ed750bd169 31
Anna Bridge 180:96ed750bd169 32 uint16_t adc_read(analogin_t *obj);
Anna Bridge 180:96ed750bd169 33
Anna Bridge 180:96ed750bd169 34 uint16_t analogin_read_u16(analogin_t *obj)
Anna Bridge 180:96ed750bd169 35 {
Anna Bridge 180:96ed750bd169 36 uint16_t value = adc_read(obj);
Anna Bridge 180:96ed750bd169 37 // 12-bit to 16-bit conversion
Anna Bridge 180:96ed750bd169 38 value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
Anna Bridge 180:96ed750bd169 39 return value;
Anna Bridge 180:96ed750bd169 40 }
Anna Bridge 180:96ed750bd169 41
Anna Bridge 180:96ed750bd169 42 float analogin_read(analogin_t *obj)
Anna Bridge 180:96ed750bd169 43 {
Anna Bridge 180:96ed750bd169 44 uint16_t value = adc_read(obj);
Anna Bridge 180:96ed750bd169 45 return (float)value * (1.0f / (float)0xFFF); // 12 bits range
Anna Bridge 180:96ed750bd169 46 }
Anna Bridge 180:96ed750bd169 47
Anna Bridge 180:96ed750bd169 48 #endif