Revision 16:721e41936a07, committed 2015-11-19

Comitter:

rmerrisonhort

Date:

Thu Nov 19 10:06:45 2015 +0000

Parent:

15:c1362c12a896

Commit message:

Added InternalTemperature class.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/InternalTemperature.h	Thu Nov 19 10:06:45 2015 +0000
@@ -0,0 +1,102 @@
+/* Internal temperature sensor class. Adapted from AnalogIn.h, from:
+ * mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * 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.
+ */
+#ifndef INTERNAL_TEMP_H
+#define INTERNAL_TEMP_H
+
+#include "platform.h"
+
+#if DEVICE_ANALOGIN
+
+#include "analogin_api.h"
+
+void temp_init(analogin_t *obj) {
+    obj->adc = (ADCName)16;
+
+    // Enable ADC1 clock source.
+    RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;
+
+    // Enable the ADC
+    ADC1->CR2 |= ADC_CR2_ADON;
+    
+    // Enable internal temperature sensor.
+    ADC->CCR |= ADC_CCR_TSVREFE;
+    
+    // Set longest sample time just to be safe.
+    ADC1->SMPR1 |= 0x1c;
+}
+
+static inline uint32_t temp_read(analogin_t *obj) {
+    // Select the appropriate channel
+    ADC1->SQR3 = (int) obj->adc;
+
+    // Start conversion
+    ADC1->CR2 |= ADC_CR2_SWSTART;
+
+    // Wait for conversion to finish
+    while (!(ADC1->SR & ADC_SR_EOC));
+
+    uint32_t data = ADC1->DR;
+    return data; // 12 bit
+}
+
+static inline uint32_t temp_read_u32(analogin_t *obj) {
+    uint32_t value;
+    value = temp_read(obj);
+    return value;
+}
+
+uint16_t temperature_read_u16(analogin_t *obj) {
+    uint32_t value = temp_read_u32(obj);
+
+    return (value << 4) | ((value >> 8) & 0x000F); // 12 bit
+}
+
+float temperature_read(analogin_t *obj) {
+    uint32_t value = temp_read_u32(obj);
+    return (float)value * (1.0f / (float)0xFFF); //Check range
+}
+
+class InternalTemperature {
+
+public:
+    InternalTemperature() {
+        temp_init(&_adc);
+    }
+
+    float read() {
+        return temperature_read(&_adc);
+    }
+
+    unsigned short read_u16() {
+        return temperature_read_u16(&_adc);
+    }
+
+#ifdef MBED_OPERATORS
+    operator float() {
+        return read();
+    }
+#endif
+
+protected:
+    analogin_t _adc;
+};
+
+
+#endif
+
+#endif
+