Question

Determine and present the register configuration needed so that the next 1024 bytes of data received on UART1 are saved in memory starting at address DestAddress. When the transfer is complete, generate an interrupt.

Answer 1

To set up the UART1 for a DMA transfer of 1024 bytes to a specific memory location with an interrupt on completion, you need to configure the DMA source, destination addresses, transfer length, memory increment mode, data width, enable the transfer complete interrupt, and enable the related DMA and UART1 settings.

Step-by-step explanation:

To configure the UART1 register for a DMA operation that transfers the next 1024 bytes of data to a specific memory address and generates an interrupt after completion, you need to set up several registers in the microcontroller. Typically, this involves configuring both the DMA and UART peripheral registers.

Although the exact register names and configuration steps can vary depending on the specific microcontroller you are using, the general steps would be:

1. Set the DMA source address to the UART1 data register.
2. Set the DMA destination address to 'DestAddress'.
3. Configure the DMA transfer length to 1024 bytes.
4. Enable the memory increment mode so the DMA knows to move to the next memory location after each byte is transferred.
5. Configure the DMA for the appropriate data width, typically 8 or 9 bits for UART data.
6. Enable the transfer complete interrupt in the DMA control register.
7. Enable the DMA channel and UART1 DMA receive requests.

Upon completion of these steps, the DMA will begin waiting for each byte to be received on UART1. Each byte received will be automatically written to the next address in memory, starting at 'DestAddress', until all 1024 bytes have been received. The DMA will then trigger an interrupt to indicate that the transfer is complete.