Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/analogin_api.c

Revision:

87:085cde657901

Child:

125:23cc3068a9e4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/analogin_api.c	Sat Feb 08 19:45:06 2014 +0000
@@ -0,0 +1,149 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2014, 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 "analogin_api.h"
+#include "wait_api.h"
+
+#if DEVICE_ANALOGIN
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "error.h"
+#include "stm32f4xx_hal.h"
+
+static const PinMap PinMap_ADC[] = {
+    {PA_0, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN0
+    {PA_1, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN1
+    {PA_4, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN4
+    {PB_0, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN8
+    {PC_1, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN11
+    {PC_0, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN10
+    {NC,   NC,    0}
+};
+
+ADC_HandleTypeDef AdcHandle;
+
+int adc_inited = 0;
+
+void analogin_init(analogin_t *obj, PinName pin) {  
+    // Get the peripheral name (ADC_1, ADC_2...) from the pin and assign it to the object
+    obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
+
+    if (obj->adc == (ADCName)NC) {
+        error("ADC error: pinout mapping failed.");
+    }
+
+    // Configure GPIO
+    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_CLOCKPRESCALER_PCLK_DIV2;
+        AdcHandle.Init.Resolution            = ADC_RESOLUTION12b;
+        AdcHandle.Init.ScanConvMode          = DISABLE;
+        AdcHandle.Init.ContinuousConvMode    = DISABLE;
+        AdcHandle.Init.DiscontinuousConvMode = DISABLE;
+        AdcHandle.Init.NbrOfDiscConversion   = 0;
+        AdcHandle.Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIGCONVEDGE_NONE;
+        AdcHandle.Init.ExternalTrigConv      = ADC_EXTERNALTRIGCONV_T1_CC1;
+        AdcHandle.Init.DataAlign             = ADC_DATAALIGN_RIGHT;
+        AdcHandle.Init.NbrOfConversion       = 1;
+        AdcHandle.Init.DMAContinuousRequests = DISABLE;
+        AdcHandle.Init.EOCSelection          = DISABLE;      
+        HAL_ADC_Init(&AdcHandle);   
+    }
+}
+
+static inline uint16_t adc_read(analogin_t *obj) {
+  ADC_ChannelConfTypeDef sConfig;
+  
+  AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
+
+  // Configure ADC channel
+  sConfig.Rank         = 1;
+  sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
+  sConfig.Offset       = 0;
+
+  switch (obj->pin) {
+      case PA_0:
+          sConfig.Channel = ADC_CHANNEL_0;
+          break;
+      case PA_1:
+          sConfig.Channel = ADC_CHANNEL_1;
+          break;
+      case PA_4:
+          sConfig.Channel = ADC_CHANNEL_4;
+          break;
+      case PB_0:
+          sConfig.Channel = ADC_CHANNEL_8;
+          break;
+      case PC_1:
+          sConfig.Channel = ADC_CHANNEL_11;
+          break;
+      case PC_0:
+          sConfig.Channel = ADC_CHANNEL_10;
+          break;
+      default:
+          return 0;
+  }
+  
+  HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
+    
+  HAL_ADC_Start(&AdcHandle); // Start conversion
+  
+  HAL_ADC_PollForConversion(&AdcHandle, 10); // Wait end of conversion
+  
+  if (HAL_ADC_GetState(&AdcHandle) == HAL_ADC_STATE_EOC_REG)
+  {  
+      return(HAL_ADC_GetValue(&AdcHandle)); // Get conversion value
+  }
+  else
+  {
+      return 0;
+  }
+}
+
+uint16_t analogin_read_u16(analogin_t *obj) {
+  return(adc_read(obj));
+}
+
+float analogin_read(analogin_t *obj) {
+  uint16_t value = adc_read(obj);
+  return (float)value * (1.0f / (float)0xFFF); // 12 bits range
+}
+
+#endif