请教高手解决MCBSP的DLB问题

只看该作者 · 2009-12-15 11:27

/*
* Copyright (C) 2003 Texas Instruments Incorporated
* All Rights Reserved
*/
/*
*---------main_mcbsp1.c---------
* In this example, the MCBSP is configured in digital loopback
* mode, with 32 bit data transfer, in multi-frame mode, using
* sample rate generator to sync frames
*/

#include <stdio.h>
#include <csl.h>
#include <csl_mcbsp.h>
#include <csl_pll.h>
//---------Global constants---------
#define N 20
//---------Global data definition---------
/* Create a MCBSP configuration structure */
MCBSP_Config ConfigLoopBack32= {
MCBSP_SPCR1_RMK(
MCBSP_SPCR1_RRST_ENABLE,
MCBSP_SPCR1_RRDY_YES,
MCBSP_SPCR1_RFULL_NO,
MCBSP_SPCR1_RSYNCERR_NO,
MCBSP_SPCR1_RINTM_RRDY,
MCBSP_SPCR1_ABIS_DISABLE,
MCBSP_SPCR1_DXENA_NA,
MCBSP_SPCR1_CLKSTP_DISABLE,
MCBSP_SPCR1_RJUST_RZF,
MCBSP_SPCR1_DLB_ON
),
MCBSP_SPCR2_RMK(
MCBSP_SPCR2_XRST_ENABLE,
MCBSP_SPCR2_XRDY_YES,
MCBSP_SPCR2_XEMPTY_NO,
MCBSP_SPCR2_XSYNCERR_NO,
MCBSP_SPCR2_XINTM_XRDY,
MCBSP_SPCR2_GRST_CLKG,
MCBSP_SPCR2_FRST_FSG,
MCBSP_SPCR2_SOFT_NO,
MCBSP_SPCR2_FREE_NO
),
MCBSP_RCR1_RMK(
MCBSP_RCR1_RWDLEN1_16BIT,
MCBSP_RCR1_RFRLEN1_OF(0)
),
MCBSP_RCR2_RMK(
MCBSP_RCR2_RDATDLY_2BIT,
MCBSP_RCR2_RFIG_YES,
MCBSP_RCR2_RCOMPAND_MSB,
MCBSP_RCR2_RWDLEN2_8BIT,
MCBSP_RCR2_RFRLEN2_OF(0),
MCBSP_RCR2_RPHASE_SINGLE
),
MCBSP_XCR1_RMK(
MCBSP_XCR1_XWDLEN1_16BIT,
MCBSP_XCR1_XFRLEN1_OF(0)
),
MCBSP_XCR2_RMK(
MCBSP_XCR2_XDATDLY_2BIT,
MCBSP_XCR2_XFIG_YES,
MCBSP_XCR2_XCOMPAND_MSB,
MCBSP_XCR2_XWDLEN2_8BIT,
MCBSP_XCR2_XFRLEN2_OF(0),
MCBSP_XCR2_XPHASE_SINGLE
),
MCBSP_SRGR1_RMK(
MCBSP_SRGR1_CLKGDV_OF(10),
MCBSP_SRGR1_FWID_OF(1)
),
MCBSP_SRGR2_RMK(
MCBSP_SRGR2_FPER_OF(15),
MCBSP_SRGR2_FSGM_DXR2XSR,
MCBSP_SRGR2_CLKSM_INTERNAL,
MCBSP_SRGR2_CLKSP_RISING,
MCBSP_SRGR2_GSYNC_FREE
),
MCBSP_MCR1_DEFAULT,
MCBSP_MCR2_DEFAULT,
MCBSP_PCR_RMK(
MCBSP_PCR_CLKRP_FALLING,
MCBSP_PCR_CLKXP_RISING,
MCBSP_PCR_FSRP_ACTIVEHIGH,
MCBSP_PCR_FSXP_ACTIVEHIGH,
MCBSP_PCR_CLKRM_INPUT,
MCBSP_PCR_CLKXM_INPUT,
MCBSP_PCR_DRSTAT_0,
MCBSP_PCR_DXSTAT_0,
MCBSP_PCR_CLKSSTAT_0,
MCBSP_PCR_SCLKME_NO,
MCBSP_PCR_FSRM_INTERNAL,
MCBSP_PCR_FSXM_INTERNAL,
MCBSP_PCR_RIOEN_SP,
MCBSP_PCR_XIOEN_SP,
MCBSP_PCR_IDLEEN_RESET
),
MCBSP_RCERA_DEFAULT,
MCBSP_RCERB_DEFAULT,
MCBSP_RCERC_DEFAULT,
MCBSP_RCERD_DEFAULT,
MCBSP_RCERE_DEFAULT,
MCBSP_RCERF_DEFAULT,
MCBSP_RCERG_DEFAULT,
MCBSP_RCERH_DEFAULT,
MCBSP_XCERA_DEFAULT,
MCBSP_XCERB_DEFAULT,
MCBSP_XCERC_DEFAULT,
MCBSP_XCERD_DEFAULT,
MCBSP_XCERE_DEFAULT,
MCBSP_XCERF_DEFAULT,
MCBSP_XCERG_DEFAULT,
MCBSP_XCERH_DEFAULT
};
/* Create data buffers for transfer */
Uint16 xmt[N], rcv[N];
//---------Function prototypes---------
void taskFunc(void);
//---------main routine---------
void main() {
  Uint16 i;

  /* Initialize CSL library, this step is required */
  CSL_init();
  PLL_setFreq(1, 0xF, 0, 1, 3, 3, 0);
  /* Initilize data buffers. xmt will be 32 bit value    */
  /* with element number in lower 16 bits and 2 * element  */
  /* in upper 16 bits.  i.e.  0x00020001, 0x00040002, etc. */
  for(i=0;i<=N-1;i++) {
xmt[i] = i;
rcv[i] = 0;
  }
  /* Call example function to perform task */
  taskFunc();
}
void taskFunc(void) {
  MCBSP_Handle mhMcbsp;
  Uint16 i;
  Uint16 err = 0;

  /* Open MCBSP Port 0, this will return a MCBSP handle that will */
  /* be used in calls to other CSl functions.                   */
  mhMcbsp = MCBSP_open(MCBSP_PORT0, MCBSP_OPEN_RESET);
  /* Write configuration structure values to MCBSP control */
  /* registers                                           */
  MCBSP_config(mhMcbsp, &ConfigLoopBack32);
  /* Start Sample Rate Generator and Frame Sync */
  MCBSP_start(mhMcbsp,
MCBSP_SRGR_START | MCBSP_SRGR_FRAMESYNC,
0x300
  );

  /* Enable MCBSP transmit and receive */
  MCBSP_start(mhMcbsp,
MCBSP_RCV_START | MCBSP_XMIT_START,
0
  );

  /* Begin data transfer loop. We will loop thru to transmit */
  /* and receive the data.                                  */
  for (i=0; i<=N-1;i++) {

/* Wait for XRDY signal before writing data to DXR */
while (!MCBSP_xrdy(mhMcbsp));

/* Write 32 bit data value to DXR */
MCBSP_write16(mhMcbsp,xmt[i]);

/* Wait for RRDY signal to read data from DRR */
while (!MCBSP_rrdy(mhMcbsp));
/* Read 32 bit value from DRR */
rcv[i] = MCBSP_read16(mhMcbsp);
  }
  /* Check data to make sure transfer was successful */
  for(i=0; i<= N-1;i++) {
if (xmt[i] != rcv[i]) {
   ++err;
   break;
}
  }

  /* We are done with MCBSP, so close it */
  MCBSP_close(mhMcbsp);
  printf("%s\n",err?"TEST FAILED\n":"TEST PASSED\n");

}
在运行程序时，程序指针一直停在 while (!MCBSP_rrdy(mhMcbsp));请问，为什么接收不到数据呢？谢谢！