What is DMA in ADC?
› The Direct Memory Access (DMA) transfers data from data source locations. to data destination locations without intervention of the CPU or other on-chip devices. › A DMA channel performs transactions.
How do you set up ADC?
To get the ADC to work, we need to do the following tasks:
- Configure I/O pins as analog input(s) and configure ADC reference.
- Configure ADC registers to choose an analog pin.
- Configure ADC registers to enable the ADC.
- Configure ADC registers to set the acquisition time.
How do you program ADC?
Steps for Configuring ADC
- Configure the GPIO pin for ADC function using PINSEL register.
- Enable the CLock to ADC module.
- Deselect all the channels and Power on the internal ADC module by setting ADCR.
- Select the Particular channel for A/D conversion by setting the corresponding bits in ADCR.SEL.
- Set the ADCR.
What is DMA stm32?
The Direct memory access (DMA) embedded in the STM32G0 microcontrollers is used to provide high-speed data transfers between peripherals and memory and between memory and memory. Data can be quickly moved by the DMA without any CPU action.
What is circular DMA?
DMA controllers support Circular mode allowing to configure the number of data items to transfer once, and automatically restart the transfer after a Transfer Complete event. In double buffer mode, a status flag and control bit (CT) is available to monitor which destination is being used for data transfers.
How does ADC work in microcontroller?
An Analog to Digital Converter (ADC) is a very useful feature that converts an analog voltage on a pin to a digital number. The microcontroller monitors the number of clock cycles that pass before the capacitor is discharged. This number of cycles is the number that is returned once the ADC is complete.
How many number of steps are there for ADC in LPC1768?
12
LPC1768 has an inbuilt 12 bit Successive Approximation ADC which is multiplexed among 8 input pins. The ADC reference voltage is measured across VREFN to VREFP, meaning it can do the conversion within this range.
How do you calculate ADC voltage?
ADC has a resolution of one part in 4,096, where 212 = 4,096. Thus, a 12-bit ADC with a maximum input of 10 VDC can resolve the measurement into 10 VDC/4096 = 0.00244 VDC = 2.44 mV. Similarly, for the same 0 to 10 VDC range, a 16-bit ADC resolution is 10/216 = 10/65,536 = 0.153 mV.