/* mbed Microcontroller Library * SPDX-License-Identifier: BSD-3-Clause ****************************************************************************** * * Copyright (c) 2015-2020 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; #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); // Save the channel for the write and read functions 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 pin_function(pinmap->pin, pinmap->function); pin_mode(pinmap->pin, PullNone); // Save the pin for future use obj->pin = pinmap->pin; // Enable DAC clock if (obj->dac == DAC_1) { __HAL_RCC_DAC1_CLK_ENABLE(); } #if defined(DAC2) if (obj->dac == DAC_2) { __HAL_RCC_DAC2_CLK_ENABLE(); } #endif // Configure DAC obj->handle.Instance = (DAC_TypeDef *)(obj->dac); obj->handle.State = HAL_DAC_STATE_RESET; if (HAL_DAC_Init(&obj->handle) != HAL_OK) { error("HAL_DAC_Init failed"); } /* Enable both Buffer and Switch in the configuration, * letting HAL layer in charge of selecting either one * or the other depending on the actual DAC instance and * channel being configured. */ sConfig.DAC_Trigger = DAC_TRIGGER_NONE; sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE; #if defined(DAC_OUTPUTSWITCH_ENABLE) sConfig.DAC_OutputSwitch = DAC_OUTPUTSWITCH_ENABLE; #endif if (pinmap->pin == PA_4) { pa4_used = 1; } if (pinmap->pin == PA_5) { pa5_used = 1; } if (HAL_DAC_ConfigChannel(&obj->handle, &sConfig, obj->channel) != HAL_OK) { error("HAL_DAC_ConfigChannel failed"); } analogout_write_u16(obj, 0); } 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) { // 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)) { __HAL_RCC_DAC1_FORCE_RESET(); __HAL_RCC_DAC1_RELEASE_RESET(); __HAL_RCC_DAC1_CLK_DISABLE(); } #if defined(DAC2) if (obj->pin == PA_6) { __HAL_RCC_DAC2_FORCE_RESET(); __HAL_RCC_DAC2_RELEASE_RESET(); __HAL_RCC_DAC2_CLK_DISABLE(); } #endif // 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