mbed library sources
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Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.
Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.
If you are looking for a stable and tested release, please import one of the official mbed library releases:
Import librarymbed
The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
targets/hal/TARGET_STM/TARGET_STM32F3XX/analogout_api.c
- Committer:
- mbed_official
- Date:
- 2015-09-11
- Revision:
- 621:9c82b0f79f3d
- Parent:
- 227:7bd0639b8911
File content as of revision 621:9c82b0f79f3d:
/* mbed Microcontroller Library * Copyright (c) 2014, STMicroelectronics * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "mbed_assert.h" #include "analogout_api.h" #if DEVICE_ANALOGOUT #include "cmsis.h" #include "pinmap.h" #define RANGE_12BIT (0xFFF) static const PinMap PinMap_DAC[] = { {PA_4, DAC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // DAC_OUT1 {NC, NC, 0} }; void analogout_init(dac_t *obj, PinName pin) { DAC_TypeDef *dac; DAC_InitTypeDef DAC_InitStructure; // Get the peripheral name (DAC_1, ...) from the pin and assign it to the object obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC); MBED_ASSERT(obj->dac == (DACName)NC); dac = (DAC_TypeDef *)(obj->dac); // Configure GPIO pinmap_pinout(pin, PinMap_DAC); // Save the channel for the write and read functions obj->channel = pin; // Enable DAC clock RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE); // Configure and enable DAC channel DAC_StructInit(&DAC_InitStructure); DAC_Init(dac, DAC_Channel_1, &DAC_InitStructure); DAC_Cmd(dac, DAC_Channel_1, ENABLE); analogout_write_u16(obj, 0); } void analogout_free(dac_t *obj) { } static inline void dac_write(dac_t *obj, uint16_t value) { DAC_TypeDef *dac = (DAC_TypeDef *)(obj->dac); DAC_SetChannel1Data(dac, DAC_Align_12b_R, value); } static inline int dac_read(dac_t *obj) { DAC_TypeDef *dac = (DAC_TypeDef *)(obj->dac); return (int)DAC_GetDataOutputValue(dac, DAC_Channel_1); } void analogout_write(dac_t *obj, float value) { if (value < 0.0f) { dac_write(obj, 0); // Min value } else if (value > 1.0f) { dac_write(obj, (uint16_t)RANGE_12BIT); // Max value } else { dac_write(obj, (uint16_t)(value * (float)RANGE_12BIT)); } } void analogout_write_u16(dac_t *obj, uint16_t value) { if (value > (uint16_t)RANGE_12BIT) { dac_write(obj, (uint16_t)RANGE_12BIT); // Max value } else { dac_write(obj, value); } } float analogout_read(dac_t *obj) { uint32_t value = dac_read(obj); return (float)value * (1.0f / (float)RANGE_12BIT); } uint16_t analogout_read_u16(dac_t *obj) { return (uint16_t)dac_read(obj); } #endif // DEVICE_ANALOGOUT