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Diff: targets/TARGET_STM/TARGET_STM32F0/analogin_api.c
- Revision:
- 149:156823d33999
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32F0/analogin_api.c Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,197 @@
+/* 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 "mbed_assert.h"
+#include "analogin_api.h"
+
+#if DEVICE_ANALOGIN
+
+#include "wait_api.h"
+#include "cmsis.h"
+#include "pinmap.h"
+#include "PeripheralPins.h"
+#include "mbed_error.h"
+
+ADC_HandleTypeDef AdcHandle;
+
+int adc_inited = 0;
+
+void analogin_init(analogin_t *obj, PinName pin) {
+ // Get the peripheral name from the pin and assign it to the object
+ obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
+ MBED_ASSERT(obj->adc != (ADCName)NC);
+
+ // Get the functions (adc channel) from the pin and assign it to the object
+ uint32_t function = pinmap_function(pin, PinMap_ADC);
+ MBED_ASSERT(function != (uint32_t)NC);
+ obj->channel = STM_PIN_CHANNEL(function);
+
+ // Configure GPIO excepted for internal channels (Temperature, Vref, Vbat)
+ if ((obj->channel != 16) && (obj->channel != 17) && (obj->channel != 18)) {
+ pinmap_pinout(pin, PinMap_ADC);
+ }
+
+ // Save pin number for the read function
+ obj->pin = pin;
+
+ // The ADC initialization is done once
+ if (adc_inited == 0) {
+ adc_inited = 1;
+
+ // Enable ADC clock
+ __ADC1_CLK_ENABLE();
+
+ // Configure ADC
+ AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
+ AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
+ AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
+ AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
+ AdcHandle.Init.ScanConvMode = DISABLE;
+ AdcHandle.Init.EOCSelection = EOC_SINGLE_CONV;
+ AdcHandle.Init.LowPowerAutoWait = DISABLE;
+ AdcHandle.Init.LowPowerAutoPowerOff = DISABLE;
+ AdcHandle.Init.ContinuousConvMode = DISABLE;
+ AdcHandle.Init.DiscontinuousConvMode = DISABLE;
+ AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
+ AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
+ AdcHandle.Init.DMAContinuousRequests = DISABLE;
+ AdcHandle.Init.Overrun = OVR_DATA_OVERWRITTEN;
+ if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
+ error("Cannot initialize ADC");
+ }
+ // Run the ADC calibration
+ if (HAL_ADCEx_Calibration_Start(&AdcHandle) != HAL_OK) {
+ error("Cannot Start ADC_Calibration");
+ }
+ }
+}
+
+static inline uint16_t adc_read(analogin_t *obj) {
+ ADC_ChannelConfTypeDef sConfig;
+
+ AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
+
+ // Configure ADC channel
+ sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
+#if defined (TARGET_STM32F091RC)
+ sConfig.SamplingTime = ADC_SAMPLETIME_13CYCLES_5;
+#else
+ sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
+#endif
+
+ switch (obj->channel) {
+ case 0:
+ sConfig.Channel = ADC_CHANNEL_0;
+ break;
+ case 1:
+ sConfig.Channel = ADC_CHANNEL_1;
+ break;
+ case 2:
+ sConfig.Channel = ADC_CHANNEL_2;
+ break;
+ case 3:
+ sConfig.Channel = ADC_CHANNEL_3;
+ break;
+ case 4:
+ sConfig.Channel = ADC_CHANNEL_4;
+ break;
+ case 5:
+ sConfig.Channel = ADC_CHANNEL_5;
+ break;
+ case 6:
+ sConfig.Channel = ADC_CHANNEL_6;
+ break;
+ case 7:
+ sConfig.Channel = ADC_CHANNEL_7;
+ break;
+ case 8:
+ sConfig.Channel = ADC_CHANNEL_8;
+ break;
+ case 9:
+ sConfig.Channel = ADC_CHANNEL_9;
+ break;
+ case 10:
+ sConfig.Channel = ADC_CHANNEL_10;
+ break;
+ case 11:
+ sConfig.Channel = ADC_CHANNEL_11;
+ break;
+ case 12:
+ sConfig.Channel = ADC_CHANNEL_12;
+ break;
+ case 13:
+ sConfig.Channel = ADC_CHANNEL_13;
+ break;
+ case 14:
+ sConfig.Channel = ADC_CHANNEL_14;
+ break;
+ case 15:
+ sConfig.Channel = ADC_CHANNEL_15;
+ break;
+ case 16:
+ sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
+ break;
+ case 17:
+ sConfig.Channel = ADC_CHANNEL_VREFINT;
+ break;
+#ifdef ADC_CHANNEL_VBAT
+ case 18:
+ sConfig.Channel = ADC_CHANNEL_VBAT;
+ break;
+#endif
+ default:
+ return 0;
+ }
+
+ // Clear all channels as it is not done in HAL_ADC_ConfigChannel()
+ AdcHandle.Instance->CHSELR = 0;
+
+ HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
+
+ HAL_ADC_Start(&AdcHandle); // Start conversion
+
+ // Wait end of conversion and get value
+ if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
+ return (HAL_ADC_GetValue(&AdcHandle));
+ } else {
+ return 0;
+ }
+}
+
+uint16_t analogin_read_u16(analogin_t *obj) {
+ uint16_t value = adc_read(obj);
+ // 12-bit to 16-bit conversion
+ value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
+ return value;
+}
+
+float analogin_read(analogin_t *obj) {
+ uint16_t value = adc_read(obj);
+ return (float)value * (1.0f / (float)0xFFF); // 12 bits range
+}
+
+#endif