mirror of https://github.com/ARMmbed/mbed-os.git
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/* mbed Microcontroller Library
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* SPDX-License-Identifier: BSD-3-Clause
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******************************************************************************
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*
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* Copyright (c) 2015-2020 STMicroelectronics.
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* All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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*/
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#include "mbed_assert.h"
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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 "PeripheralPins.h"
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static int channel1_used = 0;
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#if defined(DAC_CHANNEL_2)
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static int channel2_used = 0;
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#endif
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void analogout_init(dac_t *obj, PinName pin)
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{
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DAC_ChannelConfTypeDef sConfig = {0};
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// Get the peripheral name 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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MBED_ASSERT(obj->dac != (DACName)NC);
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// Get the pin function and assign the used channel 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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switch (STM_PIN_CHANNEL(function)) {
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case 1:
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obj->channel = DAC_CHANNEL_1;
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break;
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#if defined(DAC_CHANNEL_2)
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case 2:
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obj->channel = DAC_CHANNEL_2;
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break;
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#endif
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default:
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error("Unknown DAC channel");
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break;
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}
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// Configure GPIO
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pinmap_pinout(pin, PinMap_DAC);
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// Save the pin for future use
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obj->pin = pin;
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// Enable DAC clock
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__HAL_RCC_DAC1_CLK_ENABLE();
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// Configure DAC
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obj->handle.Instance = (DAC_TypeDef *)(obj->dac);
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obj->handle.State = HAL_DAC_STATE_RESET;
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if (HAL_DAC_Init(&obj->handle) != 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 (HAL_DAC_ConfigChannel(&obj->handle, &sConfig, obj->channel) != HAL_OK) {
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error("HAL_DAC_ConfigChannel failed");
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}
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if (obj->channel == DAC_CHANNEL_1) {
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channel1_used = 1;
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}
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#if defined(DAC_CHANNEL_2)
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if (obj->channel == DAC_CHANNEL_2) {
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channel2_used = 1;
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}
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#endif
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analogout_write_u16(obj, 0);
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HAL_DAC_Start(&obj->handle, obj->channel);
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}
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void analogout_free(dac_t *obj)
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{
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if (obj->channel == DAC_CHANNEL_1) {
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channel1_used = 0;
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}
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#if defined(DAC_CHANNEL_2)
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if (obj->channel == DAC_CHANNEL_2) {
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channel2_used = 0;
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}
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#endif
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if ((channel1_used == 0)
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#if defined(DAC_CHANNEL_2)
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&& (channel2_used == 0)
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#endif
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) {
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// Reset DAC and disable clock
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__HAL_RCC_DAC1_FORCE_RESET();
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__HAL_RCC_DAC1_RELEASE_RESET();
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__HAL_RCC_DAC1_CLK_DISABLE();
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}
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// Configure GPIO back to reset value
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pin_function(obj->pin, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0));
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}
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const PinMap *analogout_pinmap()
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{
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return PinMap_DAC;
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}
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#endif // DEVICE_ANALOGOUT
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