Diff: targets/TARGET_Maxim/TARGET_MAX32620C/analogin_api.c

Revision:

186:707f6e361f3e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32620C/analogin_api.c	Fri Jun 22 16:45:37 2018 +0100
@@ -0,0 +1,95 @@
+/*******************************************************************************
+ * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+ * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *******************************************************************************
+ */
+#include "mbed_assert.h"
+#include "analogin_api.h"
+#include "adc.h"
+#include "pinmap.h"
+#include "PeripheralPins.h"
+
+#define ADC_FULL_SCALE            0x3FFU
+#define INT_FULL_SCALE            0xFFFFU
+#define FLOAT_FULL_SCALE          0.6f
+
+static int initialized = 0;
+
+//******************************************************************************
+void analogin_init(analogin_t *obj, PinName pin)
+{
+    // Make sure pin is an analog pin we can use for ADC
+    MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC);
+
+    // Set the object pointer and channel encoding
+    obj->adc = MXC_ADC;
+    obj->channel = (mxc_adc_chsel_t)pinmap_find_function(pin, PinMap_ADC);
+
+    if (!initialized) {
+        MBED_ASSERT(ADC_Init() == E_NO_ERROR);
+        initialized = 1;
+    }
+}
+
+//******************************************************************************
+float analogin_read(analogin_t *obj)
+{
+    uint16_t tmp;
+    float result;
+
+    // Start conversion with input scaling and no input buffer bypass
+    ADC_StartConvert(obj->channel, 1, 0);
+
+    if (ADC_GetData(&tmp) == E_OVERFLOW) {
+        result = FLOAT_FULL_SCALE;
+    } else {
+        result = (float)tmp * (FLOAT_FULL_SCALE / (float)ADC_FULL_SCALE);
+    }
+
+    return result;
+}
+
+//******************************************************************************
+uint16_t analogin_read_u16(analogin_t *obj)
+{
+    uint16_t tmp;
+    uint16_t result;
+
+    // Start conversion with input scaling and no input buffer bypass
+    ADC_StartConvert(obj->channel, 1, 0);
+
+    if (ADC_GetData(&tmp) == E_OVERFLOW) {
+        result = INT_FULL_SCALE;
+    } else {
+        result = ((tmp << 6) & 0xFFC0) | ((tmp >> 4) & 0x003F);
+    }
+
+    return result;
+}