DMA with ADC for continuous sampling in Embedded C - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is DMA in the context of ADC continuous sampling?

DMA (Direct Memory Access) allows the ADC to transfer data directly to memory without CPU intervention, enabling efficient continuous sampling.

beginner

Why use DMA with ADC for continuous sampling?

Using DMA reduces CPU load by automatically moving ADC data to memory, allowing the CPU to perform other tasks while sampling continues uninterrupted.

intermediate

In DMA with ADC, what does 'circular mode' mean?

Circular mode means DMA continuously fills a buffer in memory and restarts from the beginning when full, enabling endless data capture without stopping.

intermediate

What is a typical sequence to set up DMA with ADC for continuous sampling?

1. Configure ADC for continuous conversion.<br>2. Configure DMA to transfer ADC data to memory.<br>3. Enable circular mode in DMA.<br>4. Start ADC and DMA.<br>5. Process data from buffer as needed.

intermediate

How does DMA improve power efficiency in continuous ADC sampling?

DMA reduces CPU wake-ups by handling data transfers automatically, allowing the CPU to stay in low-power mode longer, saving energy.

What role does DMA play in ADC continuous sampling?

A Processes ADC data in CPU

B Converts analog signals to digital

C Controls ADC clock speed

D Transfers ADC data directly to memory without CPU

DMA moves ADC data to memory automatically, freeing the CPU.

Which DMA mode allows continuous buffer refilling for ADC data?

A Circular mode

B Normal mode

C Burst mode

D Single transfer mode

Circular mode restarts buffer filling automatically for continuous data.

Why is DMA preferred over CPU for ADC data transfer in continuous sampling?

A DMA is slower but more accurate

B DMA increases CPU interrupts

C DMA reduces CPU workload and power consumption

D CPU cannot access ADC data

DMA handles data transfer efficiently, reducing CPU load and saving power.

What must be configured first to use DMA with ADC continuous sampling?

A Enable DMA interrupts

B Configure ADC for continuous conversion

C Set CPU clock speed

D Initialize UART communication

ADC must be set to continuous mode before DMA transfers data.

In DMA with ADC, what happens when the buffer is full in circular mode?

A DMA overwrites buffer from start

B DMA stops transferring data

C CPU clears the buffer

D ADC stops conversion

Circular mode overwrites the buffer from the beginning for continuous sampling.

Explain how DMA works with ADC to enable continuous sampling without CPU intervention.

Think about how data moves from ADC to memory automatically.

Describe the steps to configure DMA for continuous ADC sampling in an embedded system.

Focus on setup order and key configurations.