[NUCLEO_F030R8] Add analogin api

Author: bcostm

libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/analogin_api.c

@@ -0,0 +1,142 @@
+/* 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"
+
+static const PinMap PinMap_ADC[] = {
+    {PA_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN0
+    {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN1
+    {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN4
+    {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN8
+    {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN11
+    {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN10
+    {NC,   NC,    0}
+};
+
+int adc_inited = 0;
+
+void analogin_init(analogin_t *obj, PinName pin) {
+  
+    ADC_TypeDef     *adc;
+    ADC_InitTypeDef ADC_InitStructure;
+  
+    // 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 pin 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;
+
+        // Get ADC registers structure address
+        adc = (ADC_TypeDef *)(obj->adc);
+      
+        // Enable ADC clock
+        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
+               
+        // Configure ADC
+        ADC_InitStructure.ADC_Resolution           = ADC_Resolution_12b;
+        ADC_InitStructure.ADC_ContinuousConvMode   = DISABLE; 
+        ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
+        ADC_InitStructure.ADC_ExternalTrigConv     = ADC_ExternalTrigConv_T1_TRGO;
+        ADC_InitStructure.ADC_DataAlign            = ADC_DataAlign_Right;
+        ADC_InitStructure.ADC_ScanDirection        = ADC_ScanDirection_Upward;
+        ADC_Init(adc, &ADC_InitStructure);
+
+        // Calibrate ADC
+        ADC_GetCalibrationFactor(adc);
+
+        // Enable ADC
+        ADC_Cmd(adc, ENABLE);
+    }
+}
+
+static inline uint16_t adc_read(analogin_t *obj) {
+  // Get ADC registers structure address
+  ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
+  
+  adc->CHSELR = 0; // Clear all channels first
+  
+  // Configure ADC channel
+  switch (obj->pin) {
+      case PA_0:
+          ADC_ChannelConfig(adc, ADC_Channel_0, ADC_SampleTime_7_5Cycles);
+          break;
+      case PA_1:
+          ADC_ChannelConfig(adc, ADC_Channel_1, ADC_SampleTime_7_5Cycles);
+          break;
+      case PA_4:
+          ADC_ChannelConfig(adc, ADC_Channel_4, ADC_SampleTime_7_5Cycles);
+          break;
+      case PB_0:
+          ADC_ChannelConfig(adc, ADC_Channel_8, ADC_SampleTime_7_5Cycles);
+          break;
+      case PC_1:
+          ADC_ChannelConfig(adc, ADC_Channel_11, ADC_SampleTime_7_5Cycles);
+          break;
+      case PC_0:
+          ADC_ChannelConfig(adc, ADC_Channel_10, ADC_SampleTime_7_5Cycles);
+          break;
+      default:
+          return 0;
+  }
+
+  while(!ADC_GetFlagStatus(adc, ADC_FLAG_ADRDY)); // Wait ADC ready
+  
+  ADC_StartOfConversion(adc); // Start conversion
+  
+  while(ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
+  
+  return(ADC_GetConversionValue(adc)); // Get conversion value
+}
+
+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