/* mbed Microcontroller Library * SPDX-License-Identifier: BSD-3-Clause ****************************************************************************** * * Copyright (c) 2021 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" #if STATIC_PINMAP_READY #define ANALOGOUT_INIT_DIRECT analogout_init_direct void analogout_init_direct(dac_t *obj, const PinMap *pinmap) #else #define ANALOGOUT_INIT_DIRECT _analogout_init_direct static void _analogout_init_direct(dac_t *obj, const PinMap *pinmap) #endif { DAC_ChannelConfTypeDef sConfig = {0}; // Get the peripheral name from the pin and assign it to the object obj->dac = (DACName)pinmap->peripheral; MBED_ASSERT(obj->dac != (DACName)NC); // Get the pin function and assign the used channel to the object uint32_t function = (uint32_t)pinmap->function; MBED_ASSERT(function != (uint32_t)NC); switch (STM_PIN_CHANNEL(function)) { case 1: obj->channel = DAC_CHANNEL_1; break; default: error("Unknown DAC channel"); break; } // Configure GPIO pin_function(pinmap->pin, pinmap->function); pin_mode(pinmap->pin, PullNone); // Save the pin for future use obj->pin = pinmap->pin; // Enable DAC clock __HAL_RCC_DAC_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_Trigger = DAC_TRIGGER_NONE; sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE; sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_DISABLE; sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY; sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE; 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_init(dac_t *obj, PinName pin) { int peripheral = (int)pinmap_peripheral(pin, PinMap_DAC); int function = (int)pinmap_find_function(pin, PinMap_DAC); const PinMap static_pinmap = {pin, peripheral, function}; ANALOGOUT_INIT_DIRECT(obj, &static_pinmap); } void analogout_free(dac_t *obj) { __HAL_RCC_DAC_FORCE_RESET(); __HAL_RCC_DAC_RELEASE_RESET(); __HAL_RCC_DAC_CLK_DISABLE(); // Configure GPIO back to reset value pin_function(obj->pin, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)); } const PinMap *analogout_pinmap() { return PinMap_DAC; } #endif // DEVICE_ANALOGOUT