Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/analogin_api.c

Revision:

52:a51c77007319

Child:

56:99eb381a3269

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/analogin_api.c	Mon Dec 02 11:30:05 2013 +0000
@@ -0,0 +1,133 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+//==============================================================================
+// STM32F103
+//============================================================================== 
+#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_AIN, 0)},
+    {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
+    {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
+    {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
+    {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
+    {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)},
+    {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_ADCCLKConfig(RCC_PCLK2_Div4);
+        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
+               
+        // Configure ADC
+        ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
+        ADC_InitStructure.ADC_ScanConvMode = DISABLE;
+        ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
+        ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
+        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
+        ADC_InitStructure.ADC_NbrOfChannel = 1;
+        ADC_Init(adc, &ADC_InitStructure);
+
+        // Enable ADC
+        ADC_Cmd(adc, ENABLE);
+
+        // Calibrate ADC
+        ADC_ResetCalibration(adc);
+        while(ADC_GetResetCalibrationStatus(adc));
+        ADC_StartCalibration(adc);
+        while(ADC_GetCalibrationStatus(adc));    
+    }
+}
+
+static inline uint16_t adc_read(analogin_t *obj) {
+  // Get ADC registers structure address
+  ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
+  
+  // Configure ADC channel
+  switch (obj->pin) {
+      case PA_0:
+          ADC_RegularChannelConfig(adc, ADC_Channel_0, 1, ADC_SampleTime_7Cycles5);
+          break;
+      case PA_1:
+          ADC_RegularChannelConfig(adc, ADC_Channel_1, 1, ADC_SampleTime_7Cycles5);
+          break;
+      case PA_4:
+          ADC_RegularChannelConfig(adc, ADC_Channel_4, 1, ADC_SampleTime_7Cycles5);
+          break;
+      case PB_0:
+          ADC_RegularChannelConfig(adc, ADC_Channel_8, 1, ADC_SampleTime_7Cycles5);
+          break;
+      case PC_1:
+          ADC_RegularChannelConfig(adc, ADC_Channel_11, 1, ADC_SampleTime_7Cycles5);
+          break;
+      case PC_0:
+          ADC_RegularChannelConfig(adc, ADC_Channel_10, 1, ADC_SampleTime_7Cycles5);
+          break;
+      default:
+          return 0;
+  }
+
+  ADC_SoftwareStartConvCmd(adc, ENABLE); // 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