main.cpp

00001 #include "mbed.h"
00002 #include "string"
00003 
00004 #include "cmsis.h"
00005 #include "pinmap.h"
00006 #include "PeripheralPins.h"
00007 
00008  
00009 Serial pc(USBTX, USBRX);  
00010 
00011 uint32_t g_ADCValue;
00012 float g_ADC_Value_Volts;
00013 const float maxAdcBits = 4095.0f; // Using Float for clarity
00014 const float maxVolts = 3.3f;      // Using Float for clarity
00015 const float voltsPerBit = (maxVolts / maxAdcBits);
00016 
00017 int main()
00018 {
00019     //Start of initializing analog input on pin PC_1
00020     ADC_HandleTypeDef AdcHandle;
00021     GPIO_InitTypeDef gpioInit;
00022     //Start GPIO and ADC1 Clocks
00023     __GPIOC_CLK_ENABLE();
00024     __ADC1_CLK_ENABLE();
00025     //Define PC_1 which is Pin one of group C and connected to a 10K potentiometer.
00026     gpioInit.Pin = GPIO_PIN_1;
00027     gpioInit.Mode = GPIO_MODE_ANALOG;
00028     gpioInit.Pull = GPIO_NOPULL;
00029     HAL_GPIO_Init(GPIOC, &gpioInit);
00030     
00031     // Configure ADC
00032     AdcHandle.Instance = ADC1;
00033     AdcHandle.Init.ClockPrescaler        = ADC_CLOCKPRESCALER_PCLK_DIV2;
00034     AdcHandle.Init.Resolution            = ADC_RESOLUTION12b;
00035     AdcHandle.Init.ScanConvMode          = DISABLE;
00036     AdcHandle.Init.ContinuousConvMode    = ENABLE;
00037     AdcHandle.Init.DiscontinuousConvMode = DISABLE;
00038     AdcHandle.Init.NbrOfDiscConversion   = 0;
00039     AdcHandle.Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIGCONVEDGE_NONE;
00040     AdcHandle.Init.ExternalTrigConv      = ADC_EXTERNALTRIGCONV_T1_CC1;
00041     AdcHandle.Init.DataAlign             = ADC_DATAALIGN_RIGHT;
00042     AdcHandle.Init.NbrOfConversion       = 1;
00043     AdcHandle.Init.DMAContinuousRequests = DISABLE;
00044     AdcHandle.Init.EOCSelection          = DISABLE;
00045 
00046     if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
00047         pc.printf("Cannot initialize ADC\n");
00048         while(1){
00049             }
00050     }
00051     ADC_ChannelConfTypeDef sConfig = {0};
00052     // Configure ADC channel
00053     sConfig.Rank         = 1;
00054     sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
00055     sConfig.Offset       = 0;
00056     sConfig.Channel = ADC_CHANNEL_11;
00057     
00058     if (HAL_ADC_ConfigChannel(&AdcHandle, &sConfig) != HAL_OK) {
00059         pc.printf("Cannot config channel\r\n");
00060         while(1){
00061             }
00062     }
00063     HAL_ADC_ConfigChannel(&AdcHandle, &sConfig); //Not sure why, but I have to do this twice?
00064     pc.printf("AnalogIn example\r\n");
00065     HAL_ADC_Start(&AdcHandle); // Start conversion
00066     while(1) {
00067          g_ADCValue = 0;
00068          if (HAL_ADC_PollForConversion(&AdcHandle, 1000000) == HAL_OK) {
00069             g_ADCValue = HAL_ADC_GetValue(&AdcHandle);
00070             g_ADC_Value_Volts = g_ADCValue*voltsPerBit;
00071             pc.printf("Conversion ready \r\n");
00072             printf("measure = %f V \r\n", g_ADC_Value_Volts);
00073          } else {
00074             pc.printf("Conversion not ready \r\n");
00075         }
00076         wait(1.0); // 1 second
00077     }
00078 }
00079 
00080 
00081 
00082 
00083 
00084 
00085