Diff: targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogout_api.c

Revision:

144:ef7eb2e8f9f7

Parent:

50:a417edff4437

--- a/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogout_api.c	Tue Aug 02 14:07:36 2016 +0000
+++ b/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/analogout_api.c	Fri Sep 02 15:07:44 2016 +0100
@@ -1,150 +1,143 @@
-/***************************************************************************//**
- * @file analogout_aoi.c
- *******************************************************************************
- * @section License
- * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
- *******************************************************************************
- *
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- *
- * 1. The origin of this software must not be misrepresented; you must not
- *    claim that you wrote the original software.
- * 2. Altered source versions must be plainly marked as such, and must not be
- *    misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- *
- * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
- * obligation to support this Software. Silicon Labs is providing the
- * Software "AS IS", with no express or implied warranties of any kind,
- * including, but not limited to, any implied warranties of merchantability
- * or fitness for any particular purpose or warranties against infringement
- * of any proprietary rights of a third party.
- *
- * Silicon Labs will not be liable for any consequential, incidental, or
- * special damages, or any other relief, or for any claim by any third party,
- * arising from your use of this Software.
- *
- ******************************************************************************/
-
-#include "device.h"
-#if DEVICE_ANALOGOUT
-
-#include "mbed_assert.h"
-#include "error.h"
-#include "analogout_api.h"
-#include "pinmap.h"
-#include "pinmap_function.h"
-#include "PeripheralPins.h"
-#include "clocking.h"
-
-#include "em_dac.h"
-#include "em_cmu.h"
-
-static uint8_t dac_initialized = 0;
-
-void analogout_init(dac_t *obj, PinName pin)
-{
-    /* init in-memory structure */
-    obj->dac = (DAC_TypeDef *) pinmap_peripheral(pin, PinMap_DAC);
-    MBED_ASSERT((int) obj->dac != NC);
-
-    obj->channel = pin_location(pin, PinMap_DAC);
-    MBED_ASSERT((int) obj->channel != NC);
-    
-    pin_mode(pin, Disabled);
-
-    if (!dac_initialized) {
-        /* Initialize the DAC. Will disable both DAC channels, so should only be done once */
-        /* Use default settings */
-        CMU_ClockEnable(cmuClock_DAC0, true);
-
-        DAC_Init_TypeDef init = DAC_INIT_DEFAULT;
-
-        /* Calculate the DAC clock prescaler value that will result in a DAC clock
-         * close to 500kHz. Second parameter is zero. This uses the current HFPERCLK
-         * frequency instead of setting a new one. */
-        init.prescale = DAC_PrescaleCalc(500000, REFERENCE_FREQUENCY);
-
-        /* Set reference voltage to VDD */
-        init.reference = dacRefVDD;
-
-        DAC_Init(obj->dac, &init);
-        dac_initialized = 1;
-    }
-    /* Use default channel settings */
-    DAC_InitChannel_TypeDef initChannel = DAC_INITCHANNEL_DEFAULT;
-    initChannel.enable = true;
-    DAC_InitChannel(obj->dac, &initChannel, obj->channel);
-}
-
-void analogout_free(dac_t *obj)
-{
-    //Reset channel by re-initializing
-    DAC_InitChannel_TypeDef initChannel = DAC_INITCHANNEL_DEFAULT;
-    initChannel.enable = false;
-    DAC_InitChannel(obj->dac, &initChannel, obj->channel);
-    
-    //Check all channels to see if we can disable the DAC completely
-    if((DAC0->CH0CTRL & DAC_CH0CTRL_EN) == 0 && (DAC0->CH1CTRL & DAC_CH1CTRL_EN) == 0) {
-        CMU_ClockEnable(cmuClock_DAC0, false);
-        dac_initialized = 0;
-    }
-}
-
-static inline void dac_write(dac_t *obj, int value)
-{
-    switch (obj->channel) {
-        case 0:
-            obj->dac->CH0DATA = value;
-            break;
-        case 1:
-            obj->dac->CH1DATA = value;
-            break;
-    }
-}
-
-static inline int dac_read(dac_t *obj)
-{
-    switch (obj->channel) {
-        case 0:
-            return obj->dac->CH0DATA;
-            break;
-        case 1:
-            return obj->dac->CH1DATA;
-            break;
-        default:
-            error("AnalogOut pin error. Invalid channel");
-            return -1;
-            break;
-    }
-}
-
-void analogout_write(dac_t *obj, float value)
-{
-    /* We multiply the float value with 0xFFF because the DAC has 12-bit resolution.
-     * Ie. accepts values between 0 and 0xFFF (4096). */
-    dac_write(obj, value*0xFFF);
-}
-
-void analogout_write_u16(dac_t *obj, uint16_t value)
-{
-    /* The DAC has 12 bit resolution, so we remove the 4 least significant bits */
-    dac_write(obj, value >> 4);
-}
-
-float analogout_read(dac_t *obj)
-{
-    /* dac_read returns a number between 0 and 0xFFF. Division gives us a float between 0 and 1 */
-    return dac_read(obj)/(float)0xFFF;
-}
-
-uint16_t analogout_read_u16(dac_t *obj)
-{
-    /* dac_read returns a number with 12 significant digits,
-     * so we shift in 0s from right to make it a 16 bit number */
-    return dac_read(obj) << 4;
-}
-
-#endif
+/***************************************************************************//**
+ * @file analogout_aoi.c
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************************/
+
+#include "device.h"
+#if DEVICE_ANALOGOUT
+
+#include "mbed_assert.h"
+#include "error.h"
+#include "analogout_api.h"
+#include "pinmap.h"
+#include "pinmap_function.h"
+#include "PeripheralPins.h"
+#include "clocking.h"
+
+#include "em_dac.h"
+#include "em_cmu.h"
+
+static uint8_t dac_initialized = 0;
+
+void analogout_init(dac_t *obj, PinName pin)
+{
+    /* init in-memory structure */
+    obj->dac = (DAC_TypeDef *) pinmap_peripheral(pin, PinMap_DAC);
+    MBED_ASSERT((int) obj->dac != NC);
+
+    obj->channel = pin_location(pin, PinMap_DAC);
+    MBED_ASSERT((int) obj->channel != NC);
+    
+    pin_mode(pin, Disabled);
+
+    if (!dac_initialized) {
+        /* Initialize the DAC. Will disable both DAC channels, so should only be done once */
+        /* Use default settings */
+        CMU_ClockEnable(cmuClock_DAC0, true);
+
+        DAC_Init_TypeDef init = DAC_INIT_DEFAULT;
+
+        /* Calculate the DAC clock prescaler value that will result in a DAC clock
+         * close to 500kHz. Second parameter is zero. This uses the current HFPERCLK
+         * frequency instead of setting a new one. */
+        init.prescale = DAC_PrescaleCalc(500000, REFERENCE_FREQUENCY);
+
+        /* Set reference voltage to VDD */
+        init.reference = dacRefVDD;
+
+        DAC_Init(obj->dac, &init);
+        dac_initialized = 1;
+    }
+    /* Use default channel settings */
+    DAC_InitChannel_TypeDef initChannel = DAC_INITCHANNEL_DEFAULT;
+    initChannel.enable = true;
+    DAC_InitChannel(obj->dac, &initChannel, obj->channel);
+}
+
+void analogout_free(dac_t *obj)
+{
+    //Reset channel by re-initializing
+    DAC_InitChannel_TypeDef initChannel = DAC_INITCHANNEL_DEFAULT;
+    initChannel.enable = false;
+    DAC_InitChannel(obj->dac, &initChannel, obj->channel);
+    
+    //Check all channels to see if we can disable the DAC completely
+    if((DAC0->CH0CTRL & DAC_CH0CTRL_EN) == 0 && (DAC0->CH1CTRL & DAC_CH1CTRL_EN) == 0) {
+        CMU_ClockEnable(cmuClock_DAC0, false);
+        dac_initialized = 0;
+    }
+}
+
+static inline void dac_write(dac_t *obj, int value)
+{
+    switch (obj->channel) {
+        case 0:
+            obj->dac->CH0DATA = value;
+            break;
+        case 1:
+            obj->dac->CH1DATA = value;
+            break;
+    }
+}
+
+static inline int dac_read(dac_t *obj)
+{
+    switch (obj->channel) {
+        case 0:
+            return obj->dac->CH0DATA;
+            break;
+        case 1:
+            return obj->dac->CH1DATA;
+            break;
+        default:
+            error("AnalogOut pin error. Invalid channel");
+            return -1;
+            break;
+    }
+}
+
+void analogout_write(dac_t *obj, float value)
+{
+    /* We multiply the float value with 0xFFF because the DAC has 12-bit resolution.
+     * Ie. accepts values between 0 and 0xFFF (4096). */
+    dac_write(obj, value*0xFFF);
+}
+
+void analogout_write_u16(dac_t *obj, uint16_t value)
+{
+    /* The DAC has 12 bit resolution, so we remove the 4 least significant bits */
+    dac_write(obj, value >> 4);
+}
+
+float analogout_read(dac_t *obj)
+{
+    /* dac_read returns a number between 0 and 0xFFF. Division gives us a float between 0 and 1 */
+    return dac_read(obj)/(float)0xFFF;
+}
+
+uint16_t analogout_read_u16(dac_t *obj)
+{
+    /* dac_read returns a number with 12 significant digits,
+     * so we shift in 0s from right to make it a 16 bit number */
+    return dac_read(obj) << 4;
+}
+
+#endif