mbed-os/targets/TARGET_STM/TARGET_STM32L1/analogout_device.c

123 lines
3.1 KiB
C

/* mbed Microcontroller Library
* SPDX-License-Identifier: BSD-3-Clause
******************************************************************************
*
* Copyright (c) 2016-2020 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 channel1_used = 0;
#if defined(DAC_CHANNEL_2)
static int channel2_used = 0;
#endif
void analogout_init(dac_t *obj, PinName pin)
{
DAC_ChannelConfTypeDef sConfig = {0};
// Get the peripheral name (DAC_1, ...) 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);
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
pinmap_pinout(pin, PinMap_DAC);
// Save the channel for future use
obj->pin = pin;
obj->handle.Instance = DAC;
obj->handle.State = HAL_DAC_STATE_RESET;
if (HAL_DAC_Init(&obj->handle) != HAL_OK) {
error("HAL_DAC_Init failed");
}
// Enable DAC clock
__DAC_CLK_ENABLE();
// Configure DAC
sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
if (obj->channel == DAC_CHANNEL_1) {
channel1_used = 1;
}
#if defined(DAC_CHANNEL_2)
if (obj->channel == DAC_CHANNEL_2) {
channel2_used = 1;
}
#endif
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_free(dac_t *obj)
{
// Reset DAC and disable clock
if (obj->channel == DAC_CHANNEL_1) {
channel1_used = 0;
}
#if defined(DAC_CHANNEL_2)
if (obj->channel == DAC_CHANNEL_2) {
channel2_used = 0;
}
#endif
if ((channel1_used == 0)
#if defined(DAC_CHANNEL_2)
&& (channel2_used == 0)
#endif
) {
__DAC_FORCE_RESET();
__DAC_RELEASE_RESET();
__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