Diff: targets/TARGET_STM/TARGET_STM32F2/analogout_api.c

Revision:

149:156823d33999

Parent:

144:ef7eb2e8f9f7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32F2/analogout_api.c	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,155 @@
+/* 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