--- /dev/null
+/* 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 "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
+
+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);
+
+ // 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_FORCE_RESET)
+ 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_FORCE_RESET)
+ 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, uint16_t value)
+{
+ if ((obj->pin == PA_4) || (obj->pin == PA_6)) {
+ HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, value);
+ HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1);
+ }
+
+#if defined(DAC_CHANNEL_2)
+ if (obj->pin == PA_5) {
+ HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, value);
+ HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2);
+ }
+#endif
+}
+
+static inline int dac_read(dac_t *obj)
+{
+ if ((obj->pin == PA_4) || (obj->pin == PA_6)) {
+ return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
+#if defined(DAC_CHANNEL_2)
+ } else if (obj->pin == PA_5) {
+ return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2);
+#endif
+ } else {
+ 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, (uint16_t)DAC_RANGE); // Max value
+ } else {
+ dac_write(obj, (uint16_t)(value * (float)DAC_RANGE));
+ }
+}
+
+void analogout_write_u16(dac_t *obj, uint16_t value)
+{
+ if (value > (uint16_t)DAC_RANGE) {
+ dac_write(obj, (uint16_t)DAC_RANGE); // Max value
+ } else {
+ dac_write(obj, value);
+ }
+}
+
+float analogout_read(dac_t *obj)
+{
+ uint32_t value = dac_read(obj);
+ return (float)((float)value * (1.0f / (float)DAC_RANGE));
+}
+
+uint16_t analogout_read_u16(dac_t *obj)
+{
+ return (uint16_t)dac_read(obj);
+}
+
+#endif // DEVICE_ANALOGOUT
projects / qmk_firmware.git / blobdiff