MBED-DEV only fro Nucleo STM32F303K8T6
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targets/TARGET_STM/TARGET_STM32F3/analogout_api.c
- Committer:
- pravinautosys
- Date:
- 2016-11-19
- Revision:
- 151:acf04f8e7d03
- Parent:
- 149:156823d33999
File content as of revision 151:acf04f8e7d03:
/* 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" #define DAC_RANGE (0xFFF) // 12 bits #define DAC_NB_BITS (12) static DAC_HandleTypeDef DacHandle; // 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; // 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); obj->channel = STM_PIN_CHANNEL(function); // Configure GPIO pinmap_pinout(pin, PinMap_DAC); // Save the pin for future use obj->pin = pin; // Enable DAC clock if (obj->dac == DAC_1) { __DAC1_CLK_ENABLE(); } #if defined(DAC2) if (obj->dac == DAC_2) { __DAC2_CLK_ENABLE(); } #endif // Configure DAC DacHandle.Instance = (DAC_TypeDef *)(obj->dac); sConfig.DAC_Trigger = DAC_TRIGGER_NONE; sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE; if (pin == PA_4) { HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1); pa4_used = 1; } #if defined(DAC_CHANNEL_2) if (pin == PA_5) { HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2); pa5_used = 1; } #endif if (pin == PA_6) { HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1); } analogout_write_u16(obj, 0); } 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)) { __DAC1_FORCE_RESET(); __DAC1_RELEASE_RESET(); __DAC1_CLK_DISABLE(); } #if defined(DAC2) if (obj->pin == PA_6) { __DAC2_FORCE_RESET(); __DAC2_RELEASE_RESET(); __DAC2_CLK_DISABLE(); } #endif // Configure GPIO pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0)); } static inline void dac_write(dac_t *obj, int value) { if (obj->channel == 1) { HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE)); HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1); } #if defined(DAC_CHANNEL_2) if (obj->channel == 2) { HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE)); HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2); } #endif } static inline int dac_read(dac_t *obj) { if (obj->channel == 1) { return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1); } #if defined(DAC_CHANNEL_2) if (obj->channel == 2) { return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2); } #endif return 0; } 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