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- /* mbed Microcontroller Library
- * Copyright (c) 2015, 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"
- #include "mbed_error.h"
- #include "PeripheralPins.h"
- // These variables are used for the "free" function
- static int channel1_used = 0;
- static int channel2_used = 0;
- void analogout_init(dac_t *obj, PinName pin)
- {
- DAC_ChannelConfTypeDef sConfig = {0};
- // Get the peripheral name from the pin and assign it to the object
- obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
- MBED_ASSERT(obj->dac != (DACName)NC);
- // Get the pin function and assign the used channel to the object
- uint32_t function = pinmap_function(pin, PinMap_DAC);
- MBED_ASSERT(function != (uint32_t)NC);
- switch (STM_PIN_CHANNEL(function)) {
- case 1:
- obj->channel = DAC_CHANNEL_1;
- break;
- #if defined(DAC_CHANNEL_2)
- case 2:
- obj->channel = DAC_CHANNEL_2;
- break;
- #endif
- default:
- error("Unknown DAC channel");
- break;
- }
- // Configure GPIO
- pinmap_pinout(pin, PinMap_DAC);
- // Save the pin for future use
- obj->pin = pin;
- // Enable DAC clock
- __HAL_RCC_DAC1_CLK_ENABLE();
- // Configure DAC
- obj->handle.Instance = DAC;
- obj->handle.State = HAL_DAC_STATE_RESET;
- if (HAL_DAC_Init(&obj->handle) != HAL_OK) {
- error("HAL_DAC_Init failed");
- }
- sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
- sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
- sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
- sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_DISABLE;
- sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
- if (obj->channel == DAC_CHANNEL_1) {
- channel1_used = 1;
- } else { // channel 1 per default
- channel2_used = 1;
- }
- if (HAL_DAC_ConfigChannel(&obj->handle, &sConfig, obj->channel) != HAL_OK) {
- error("Cannot configure DAC channel\n");
- }
- analogout_write_u16(obj, 0);
- }
- void analogout_free(dac_t *obj)
- {
- // Reset DAC and disable clock
- if (obj->channel == DAC_CHANNEL_1) {
- channel1_used = 0;
- }
- #if defined(DAC_CHANNEL_2)
- if (obj->channel == DAC_CHANNEL_2) {
- channel2_used = 0;
- }
- #endif
- if ((channel1_used == 0) && (channel2_used == 0)) {
- __HAL_RCC_DAC1_FORCE_RESET();
- __HAL_RCC_DAC1_RELEASE_RESET();
- __HAL_RCC_DAC1_CLK_DISABLE();
- }
- // Configure GPIO
- pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
- }
- #endif // DEVICE_ANALOGOUT
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