Diff: targets/TARGET_STM/analogout_api.c

Revision:

169:9672193075cf

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/analogout_api.c	Thu Jul 06 15:42:05 2017 +0100
@@ -0,0 +1,80 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017, 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 inline void dac_write(dac_t *obj, int value)
+{
+    HAL_DAC_SetValue(&obj->handle, obj->channel, DAC_ALIGN_12B_R, (value & DAC_RANGE));
+    HAL_DAC_Start(&obj->handle, obj->channel);
+}
+
+static inline int dac_read(dac_t *obj)
+{
+    return (int)HAL_DAC_GetValue(&obj->handle, obj->channel);
+}
+
+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