Direct Memory Access (DMA) APIs. More...

Functions
gos_result_t	gos_dma_alloc ( gos_handler_t callback, void arg, gos_dma_channel_t channel_ptr)
	Allocate a DMA channel. More...

gos_result_t	gos_dma_free ( gos_dma_channel_t channel)
	Free a DMA channel. More...

Detailed Description

Direct Memory Access (DMA) APIs.

Function Documentation

Allocate a DMA channel.

Allocates a DMA channel from the kernel. The returned channel will be exclusively available to the user application.

Note: It is imperative to use this API to allocate channels which will be manually accessed by the application to prevent conflicts with the kernel's use of DMA.; You must use gos_dma_free() to de-allocate the channel once it is no longer needed.

Parameters

[in]	`callback`	function to be called when a DMA transfer on the channel returned by this function is complete. This function will execute in the IRQ context.
[in]	`arg`	argument to pass to callback function
[out]	`channel_ptr`	Pointer to hold channel number of allocated DMA channel

gos_result_t gos_dma_free ( gos_dma_channel_t channel )

Free a DMA channel.

Release a channel allocated by gos_dma_alloc.

Parameters

[in] channel DMA channel to free