acpy2_initchan.c

来自「The DSPLIB is a collection of 39 high-le」· C语言 代码 · 共 45 行

/*
 *  Copyright 2002 by Texas Instruments Incorporated.
 *  All rights reserved. Property of Texas Instruments Incorporated.
 *  Restricted rights to use, duplicate or disclose this code are
 *  granted through contract.
 *  
 */
/* "@(#) XDAS 2.5.11 10-11-02 (xdas-d15)" */

#pragma CODE_SECTION(ACPY2_initChannel, ".text:ACPY2_initChannel")

#include <std.h>

#include <csl_edma.h>

#include <_acpy2.h>
#include <idma2_priv.h>

/*
 *  ======== ACPY2_initChannel ======== 
 *  Initialize the IDMA2 channel object passed in.  Set the priority level
 *  based on the queue id.
 *
 */
Void ACPY2_initChannel(IDMA2_Handle handle, Int queueId)
{
    /* 
     * NOTE: qid is an arbitrary number that has to be mapped to physical
     * hardware queues on the C6x EDMA device.  The scheme chosen here
     * is to map even queue ids to low priority h/w queue and odd queue 
     * ids to high priority h/w queue.  This scheme can be customized to 
     * suit a specific application.
     */
    if ((queueId % _ACPY2_NUM_HWQUEUES) == 0) {
        //Set to low priority
        (handle->config).opt = EDMA_FMK(OPT,PRI,EDMA_OPT_PRI_LOW);   
    }
    else {
        //Set to high priority
        (handle->config).opt = EDMA_FMK(OPT,PRI,EDMA_OPT_PRI_HIGH);   
    }
}