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Diff: targets/TARGET_STM/TARGET_STM32L1/analogin_api.c
- Revision:
- 149:156823d33999
diff -r 21d94c44109e -r 156823d33999 targets/TARGET_STM/TARGET_STM32L1/analogin_api.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32L1/analogin_api.c Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,249 @@
+/* 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 "mbed_error.h"
+#include "PeripheralPins.h"
+
+ADC_HandleTypeDef AdcHandle;
+
+int adc_inited = 0;
+
+void analogin_init(analogin_t *obj, PinName pin)
+{
+ RCC_OscInitTypeDef RCC_OscInitStruct;
+
+ // 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 pin function and assign the used channel 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)
+ if ((obj->channel != 16) && (obj->channel != 17)) {
+ 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 the HSI (to clock the ADC)
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+ RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
+ HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+ AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
+
+ // Enable ADC clock
+ __ADC1_CLK_ENABLE();
+
+ // Configure ADC
+ AdcHandle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
+ AdcHandle.Init.Resolution = ADC_RESOLUTION12b;
+ AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
+ AdcHandle.Init.ScanConvMode = DISABLE; // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
+ AdcHandle.Init.EOCSelection = EOC_SINGLE_CONV; // On STM32L1xx ADC, overrun detection is enabled only if EOC selection is set to each conversion (or transfer by DMA enabled, this is not the case in this example).
+ AdcHandle.Init.LowPowerAutoWait = ADC_AUTOWAIT_UNTIL_DATA_READ; // Enable the dynamic low power Auto Delay: new conversion start only when the previous conversion (for regular group) or previous sequence (for injected group) has been treated by user software.
+ AdcHandle.Init.LowPowerAutoPowerOff = ADC_AUTOPOWEROFF_IDLE_PHASE; // Enable the auto-off mode: the ADC automatically powers-off after a conversion and automatically wakes-up when a new conversion is triggered (with startup time between trigger and start of sampling).
+ AdcHandle.Init.ChannelsBank = ADC_CHANNELS_BANK_A;
+ AdcHandle.Init.ContinuousConvMode = DISABLE; // Continuous mode disabled to have only 1 conversion at each conversion trig
+ AdcHandle.Init.NbrOfConversion = 1; // Parameter discarded because sequencer is disabled
+ AdcHandle.Init.DiscontinuousConvMode = DISABLE; // Parameter discarded because sequencer is disabled
+ AdcHandle.Init.NbrOfDiscConversion = 1; // Parameter discarded because sequencer is disabled
+ AdcHandle.Init.ExternalTrigConv = 0; // Not used
+ AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
+ AdcHandle.Init.DMAContinuousRequests = DISABLE;
+
+ if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
+ error("Cannot initialize ADC");
+ }
+ }
+}
+
+static inline uint16_t adc_read(analogin_t *obj)
+{
+ ADC_ChannelConfTypeDef sConfig = {0};
+
+ AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
+
+ // Configure ADC channel
+ 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;
+ case 18:
+ sConfig.Channel = ADC_CHANNEL_18;
+ break;
+ case 19:
+ sConfig.Channel = ADC_CHANNEL_19;
+ break;
+ case 20:
+ sConfig.Channel = ADC_CHANNEL_20;
+ break;
+ case 21:
+ sConfig.Channel = ADC_CHANNEL_21;
+ break;
+ case 22:
+ sConfig.Channel = ADC_CHANNEL_22;
+ break;
+ case 23:
+ sConfig.Channel = ADC_CHANNEL_23;
+ break;
+ case 24:
+ sConfig.Channel = ADC_CHANNEL_24;
+ break;
+ case 25:
+ sConfig.Channel = ADC_CHANNEL_25;
+ break;
+ case 26:
+ sConfig.Channel = ADC_CHANNEL_26;
+ break;
+#ifdef ADC_CHANNEL_27
+ case 27:
+ sConfig.Channel = ADC_CHANNEL_27;
+ break;
+#endif
+#ifdef ADC_CHANNEL_28
+ case 28:
+ sConfig.Channel = ADC_CHANNEL_28;
+ break;
+#endif
+#ifdef ADC_CHANNEL_29
+ case 29:
+ sConfig.Channel = ADC_CHANNEL_29;
+ break;
+#endif
+#ifdef ADC_CHANNEL_30
+ case 30:
+ sConfig.Channel = ADC_CHANNEL_30;
+ break;
+#endif
+#ifdef ADC_CHANNEL_31
+ case 31:
+ sConfig.Channel = ADC_CHANNEL_31;
+ break;
+#endif
+ default:
+ return 0;
+ }
+
+ sConfig.Rank = ADC_REGULAR_RANK_1;
+ sConfig.SamplingTime = ADC_SAMPLETIME_16CYCLES;
+
+ 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