/* mbed Microcontroller Library * SPDX-License-Identifier: BSD-3-Clause ****************************************************************************** * * Copyright (c) 2016-2020 STMicroelectronics. * All rights reserved. * * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */ #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 pa4_used = 0; static int pa5_used = 0; void analogout_init(dac_t *obj, PinName pin) { DAC_ChannelConfTypeDef sConfig = {0}; // 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); // Get the pin function and assign the used channel to the object uint32_t function = pinmap_function(pin, PinMap_DAC); 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 channel for future use obj->pin = pin; obj->handle.Instance = DAC; obj->handle.State = HAL_DAC_STATE_RESET; if (HAL_DAC_Init(&obj->handle) != HAL_OK) { error("HAL_DAC_Init failed"); } // Enable DAC clock __DAC_CLK_ENABLE(); // Configure DAC sConfig.DAC_Trigger = DAC_TRIGGER_NONE; sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE; if (pin == PA_4) { pa4_used = 1; } else { // PA_5 pa5_used = 1; } if (HAL_DAC_ConfigChannel(&obj->handle, &sConfig, obj->channel) != HAL_OK) { error("Cannot configure DAC channel\n"); } analogout_write_u16(obj, 0); HAL_DAC_Start(&obj->handle, obj->channel); } void analogout_free(dac_t *obj) { // Reset DAC and disable clock if (obj->pin == PA_4) { pa4_used = 0; } if (obj->pin == PA_5) { pa5_used = 0; } if ((pa4_used == 0) && (pa5_used == 0)) { __DAC_FORCE_RESET(); __DAC_RELEASE_RESET(); __DAC_CLK_DISABLE(); } // Configure GPIO pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0)); } const PinMap *analogout_pinmap() { return PinMap_DAC; } #endif // DEVICE_ANALOGOUT