/* a DMA_Channel. users should not access the fields in this structure */
typedef struct DMA_Channel
{
    int c_number;			/* physical hardware DMA channel */
    
    /* the following junk is all here to support DMA_channel_status */

    /* first entry in chaining operation so DMA_channel_status can scan down
     * the list and find where it is up to. */
    int *c_chainstart;

    /* a faked up descriptor for single (non-chained) transfers; only used for
     * DMA_channel_status. */
    char c_singledesc;
} DMA_Channel;


/* Start or restart (after a stop) a DMA operation.
 * The operation will stop automatically when complete.
 */
void DMA_channel_start(DMA_Channel *channel	/* DMA channel to start */){}