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targets/TARGET_STM/TARGET_STM32F2/analogout_api.c
- Committer:
- amithy
- Date:
- 2017-11-09
- Revision:
- 178:c26431f84b0d
- Parent:
- 149:156823d33999
File content as of revision 178:c26431f84b0d:
/* mbed Microcontroller Library * Copyright (c) 2016, 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 "analogout_api.h" #if DEVICE_ANALOGOUT #include "cmsis.h" #include "pinmap.h" #include "mbed_error.h" #include "stm32f2xx_hal.h" #include "PeripheralPins.h" #define DAC_RANGE (0xFFF) // 12 bits #define DAC_NB_BITS (12) DAC_HandleTypeDef DacHandle; static DAC_ChannelConfTypeDef sConfig; void analogout_init(dac_t *obj, PinName pin) { uint32_t channel ; HAL_StatusTypeDef status; // Get the peripheral name (DAC_1, ...) from the pin and assign it to the object obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC); // Get the functions (dac channel) from the pin and assign it to the object uint32_t function = pinmap_function(pin, PinMap_DAC); MBED_ASSERT(function != (uint32_t)NC); // Save the channel for the write and read functions obj->channel = STM_PIN_CHANNEL(function); if (obj->dac == (DACName)NC) { error("DAC pin mapping failed"); } // Configure GPIO pinmap_pinout(pin, PinMap_DAC); __GPIOA_CLK_ENABLE(); __DAC_CLK_ENABLE(); DacHandle.Instance = DAC; status = HAL_DAC_Init(&DacHandle); if (status != HAL_OK) { error("HAL_DAC_Init failed"); } sConfig.DAC_Trigger = DAC_TRIGGER_NONE; sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE; if (obj->channel == 1) { channel = DAC_CHANNEL_1; } else { channel = DAC_CHANNEL_2; } if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, channel) != HAL_OK) { error("HAL_DAC_ConfigChannel failed"); } if (HAL_DAC_Start(&DacHandle, channel) != HAL_OK) { error("HAL_DAC_Start failed"); } if (HAL_DAC_SetValue(&DacHandle, channel, DAC_ALIGN_12B_R, 0x000) != HAL_OK) { error("HAL_DAC_SetValue failed"); } } void analogout_free(dac_t *obj) { } static inline void dac_write(dac_t *obj, int value) { HAL_StatusTypeDef status = HAL_ERROR; if (obj->channel == 1) { status = HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE)); } else if (obj->channel == 2) { status = HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE)); } if (status != HAL_OK) { error("DAC pin mapping failed"); } } static inline int dac_read(dac_t *obj) { if (obj->channel == 1) { return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1); } else if (obj->channel == 2) { return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2); } return 0; /* Just silented warning */ } void analogout_write(dac_t *obj, float value) { if (value < 0.0f) { dac_write(obj, 0); // Min value } else if (value > 1.0f) { dac_write(obj, (int)DAC_RANGE); // Max value } else { dac_write(obj, (int)(value * (float)DAC_RANGE)); } } void analogout_write_u16(dac_t *obj, uint16_t value) { dac_write(obj, value >> (16 - DAC_NB_BITS)); } float analogout_read(dac_t *obj) { uint32_t value = dac_read(obj); return (float)value * (1.0f / (float)DAC_RANGE); } uint16_t analogout_read_u16(dac_t *obj) { uint32_t value = dac_read(obj); return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits } #endif // DEVICE_ANALOGOUT