Module sam4l::dma [−] [src]

Implementation of the PDCA DMA peripheral.

Reexports

use core::cmp;

use core::intrinsics;

use core::cell::Cell;

use kernel::common::VolatileCell;

use kernel::common::take_cell::TakeCell;

use pm;

DMAChannel
DMARegisters	Memory registers for a DMA channel. Section 16.6.1 of the datasheet.

DMAChannelNum	The DMA channel number. Each channel transfers data between memory and a particular peripheral function (e.g., SPI read or SPI write, but not both simultaneously). There are 16 available channels (Section 16.7).
DMAPeripheral	The peripheral function a channel is assigned to (Section 16.7). `_RX` means transfer data from peripheral to memory, `_TX` means transfer data from memory to peripheral.
DMAWidth

DMA_BASE_ADDR	The PDCA's base addresses in memory (Section 7.1 of manual).
DMA_CHANNEL_SIZE	The number of bytes between each memory mapped DMA Channel (Section 16.6.1).

DMA_CHANNELS
NUM_ENABLED	Shared counter that Keeps track of how many DMA channels are currently active.