mirror of https://github.com/ARMmbed/mbed-os.git
132 lines
4.1 KiB
C
132 lines
4.1 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 "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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// These variables are used for the "free" function
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static int channel1_used = 0;
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static int channel2_used = 0;
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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;
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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_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
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sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
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sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
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sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_DISABLE;
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sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
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if (obj->channel == DAC_CHANNEL_1) {
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channel1_used = 1;
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} else { // channel 1 per default
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channel2_used = 1;
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}
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if (HAL_DAC_ConfigChannel(&obj->handle, &sConfig, obj->channel) != HAL_OK) {
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error("Cannot configure DAC channel\n");
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}
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analogout_write_u16(obj, 0);
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}
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void analogout_free(dac_t *obj)
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{
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// Reset DAC and disable clock
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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) && (channel2_used == 0)) {
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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
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pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, 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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