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/* mbed Microcontroller Library
* Copyright (c) 2014, 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 "stm32f4xx_hal.h"
#include "PeripheralPins.h"
#define RANGE_12BIT (0xFFF)
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, uint16_t value)
{
HAL_StatusTypeDef status = HAL_ERROR;
if (obj->channel == 1) {
status = HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, value);
} else if (obj->channel == 2) {
status = HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, value);
}
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, (uint16_t)RANGE_12BIT); // Max value
} else {
dac_write(obj, (uint16_t)(value * (float)RANGE_12BIT));
}
}
void analogout_write_u16(dac_t *obj, uint16_t value)
{
if (value > (uint16_t)RANGE_12BIT) {
value = (uint16_t)RANGE_12BIT; // Max value
}
dac_write(obj, value);
}
float analogout_read(dac_t *obj)
{
uint32_t value = dac_read(obj);
return (float)value * (1.0f / (float)RANGE_12BIT);
}
uint16_t analogout_read_u16(dac_t *obj)
{
return (uint16_t)dac_read(obj);
}
#endif // DEVICE_ANALOGOUT
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