ARM STM32 Study Note_7/ADC

-With 12 bit ADC, minimal value is 0x0000, max is 0x0fff.

-ADC_InitTypeDef Structure:

-To free the CPU here, use DMA to store converted value

 

-DMA structure

 -DMA Configurations:
  1. ADC input/output pin configuration, means set the pin mode.
  2. enable the AHB peripheral clk for DMA1/2
  3. reset the  DMA channel->set the parameters for DMA structure->initial the DMA channel with the DMA structure.

  4.enable the DMA channel using DMA_Cmd

-ADC configurations:
  1. enable the APB2 peripheral clk on both ADC1 and GPIOx
  2. set the parameters for ADC structure
  3. use the ADC_RegularChannelConfig function to set the ADC's channel number, rank and sampling times

 
  4. enable DMA and ADC connection using ADC_DMACmd()
  5. enable ADC using ADC_Cmd
  6. To reduce the ADC error, new capacitance need to be calculated.
     reset the ADC calibration register using-> ADC_ResetCalibration(), and then probe the ADC_GetResetCalibrationStatus() until it's SET.
     recalibrate the ADC with ADC_StartCalibration(), probe ADC_GetCalibrationStatus() until it's SET.
  7 Finally, enable conversion with ADC_SoftwareStartConvCmd();