Diff: targets/TARGET_STM/TARGET_STM32L1/analogin_device.c

Revision:

181:96ed750bd169

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32L1/analogin_device.c	Wed Jan 17 15:23:54 2018 +0000
@@ -0,0 +1,238 @@
+/* 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 "mbed_wait_api.h"
+#include "cmsis.h"
+#include "pinmap.h"
+#include "mbed_error.h"
+#include "PeripheralPins.h"
+#include <stdbool.h>
+
+void analogin_init(analogin_t *obj, PinName pin)
+{
+    static bool adc_hsi_inited = false;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+    uint32_t function = (uint32_t)NC;
+
+    // ADC Internal Channels "pins"  (Temperature, Vref, Vbat, ...)
+    //   are described in PinNames.h and PeripheralPins.c
+    //   Pin value must be between 0xF0 and 0xFF
+    if ((pin < 0xF0) || (pin >= 0x100)) {
+        // Normal channels
+        // Get the peripheral name from the pin and assign it to the object
+        obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC);
+        // Get the functions (adc channel) from the pin and assign it to the object
+        function = pinmap_function(pin, PinMap_ADC);
+        // Configure GPIO
+        pinmap_pinout(pin, PinMap_ADC);
+    } else {
+        // Internal channels
+        obj->handle.Instance = (ADC_TypeDef *)pinmap_peripheral(pin, PinMap_ADC_Internal);
+        function = pinmap_function(pin, PinMap_ADC_Internal);
+        // No GPIO configuration for internal channels
+    }
+    MBED_ASSERT(obj->handle.Instance != (ADC_TypeDef *)NC);
+    MBED_ASSERT(function != (uint32_t)NC);
+
+    obj->channel = STM_PIN_CHANNEL(function);
+
+    // Save pin number for the read function
+    obj->pin = pin;
+
+    // Configure ADC object structures
+    obj->handle.State = HAL_ADC_STATE_RESET;
+    obj->handle.Init.ClockPrescaler        = ADC_CLOCK_ASYNC_DIV4;
+    obj->handle.Init.Resolution            = ADC_RESOLUTION_12B;
+    obj->handle.Init.DataAlign             = ADC_DATAALIGN_RIGHT;
+    obj->handle.Init.ScanConvMode          = DISABLE;                       // Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1)
+    obj->handle.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).
+    obj->handle.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.
+    obj->handle.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).
+    obj->handle.Init.ChannelsBank          = ADC_CHANNELS_BANK_A;
+    obj->handle.Init.ContinuousConvMode    = DISABLE;                       // Continuous mode disabled to have only 1 conversion at each conversion trig
+    obj->handle.Init.NbrOfConversion       = 1;                             // Parameter discarded because sequencer is disabled
+    obj->handle.Init.DiscontinuousConvMode = DISABLE;                       // Parameter discarded because sequencer is disabled
+    obj->handle.Init.NbrOfDiscConversion   = 1;                             // Parameter discarded because sequencer is disabled
+    obj->handle.Init.ExternalTrigConv      = 0;                             // Not used
+    obj->handle.Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIGCONVEDGE_NONE;
+    obj->handle.Init.DMAContinuousRequests = DISABLE;
+
+    __HAL_RCC_ADC1_CLK_ENABLE();
+
+    if (HAL_ADC_Init(&obj->handle) != HAL_OK) {
+        error("Cannot initialize ADC");
+    }
+
+    // This section is done only once
+    if (!adc_hsi_inited) {
+        adc_hsi_inited = true;
+        // 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;
+        RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
+        HAL_RCC_OscConfig(&RCC_OscInitStruct);
+    }
+}
+
+uint16_t adc_read(analogin_t *obj)
+{
+    ADC_ChannelConfTypeDef sConfig = {0};
+
+    // 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(&obj->handle, &sConfig);
+
+    HAL_ADC_Start(&obj->handle); // Start conversion
+
+    // Wait end of conversion and get value
+    if (HAL_ADC_PollForConversion(&obj->handle, 10) == HAL_OK) {
+        return (uint16_t)HAL_ADC_GetValue(&obj->handle);
+    } else {
+        return 0;
+    }
+}
+
+#endif