mirror of https://github.com/ARMmbed/mbed-os.git
148 lines
4.7 KiB
C
148 lines
4.7 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2015, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "analogout_api.h"
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#if DEVICE_ANALOGOUT
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#include "cmsis.h"
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#include "pinmap.h"
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#include "mbed_error.h"
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#include "stm32f4xx_hal.h"
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#include "PeripheralPins.h"
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#define DAC_RANGE (0xFFF) // 12 bits
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#define DAC_NB_BITS (12)
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DAC_HandleTypeDef DacHandle;
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static DAC_ChannelConfTypeDef sConfig;
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void analogout_init(dac_t *obj, PinName pin) {
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uint32_t channel ;
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HAL_StatusTypeDef status;
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// Get the peripheral name (DAC_1, ...) from the pin and assign it to the object
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obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
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// Get the functions (dac channel) from the pin and assign it to the object
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uint32_t function = pinmap_function(pin, PinMap_DAC);
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MBED_ASSERT(function != (uint32_t)NC);
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// Save the channel for the write and read functions
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obj->channel = STM_PIN_CHANNEL(function);
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if (obj->dac == (DACName)NC) {
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error("DAC pin mapping failed");
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}
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// Configure GPIO
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pinmap_pinout(pin, PinMap_DAC);
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__HAL_RCC_GPIOA_CLK_ENABLE();
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__HAL_RCC_DAC_CLK_ENABLE();
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DacHandle.Instance = DAC;
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status = HAL_DAC_Init(&DacHandle);
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if ( status != HAL_OK ) {
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error("HAL_DAC_Init failed");
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}
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sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
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sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
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if (obj->channel == 1) {
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channel = DAC_CHANNEL_1;
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} else {
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channel = DAC_CHANNEL_2;
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}
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if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, channel) != HAL_OK) {
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error("HAL_DAC_ConfigChannel failed");
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}
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if (HAL_DAC_Start(&DacHandle, channel) != HAL_OK) {
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error("HAL_DAC_Start failed");
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}
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if (HAL_DAC_SetValue(&DacHandle, channel, DAC_ALIGN_12B_R, 0x000) != HAL_OK) {
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error("HAL_DAC_SetValue failed");
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}
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}
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void analogout_free(dac_t *obj) {
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}
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static inline void dac_write(dac_t *obj, int value) {
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HAL_StatusTypeDef status = HAL_ERROR;
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if (obj->channel == 1) {
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status = HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE));
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} else if (obj->channel == 2) {
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status = HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE));
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}
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if ( status != HAL_OK ) {
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error("DAC pin mapping failed");
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}
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}
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static inline int dac_read(dac_t *obj) {
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if (obj->channel == 1) {
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return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
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} else if (obj->channel == 2) {
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return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2);
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}
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return 0; /* Just silented warning */
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}
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void analogout_write(dac_t *obj, float value) {
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if (value < 0.0f) {
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dac_write(obj, 0); // Min value
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} else if (value > 1.0f) {
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dac_write(obj, (int)DAC_RANGE); // Max value
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} else {
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dac_write(obj, (int)(value * (float)DAC_RANGE));
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}
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}
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void analogout_write_u16(dac_t *obj, uint16_t value) {
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dac_write(obj, value >> (16 - DAC_NB_BITS));
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}
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float analogout_read(dac_t *obj) {
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uint32_t value = dac_read(obj);
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return (float)value * (1.0f / (float)DAC_RANGE);
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}
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uint16_t analogout_read_u16(dac_t *obj) {
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uint32_t value = dac_read(obj);
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return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
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}
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#endif // DEVICE_ANALOGOUT
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