TI中文支持网（在CCS5.5 的编译环境下，用的是C5509开发板）
我在编译 运行 C55xxCSL\examples\generic5509\csl\mcbsp\mcbsp1 里面的McBSP的工程之后，下面提示 TEST FAILED。
并且，当我把鼠标放在taskFxn()这个函数上时，显示
请问为什么会这样？
Liubin Wang：
（附件中顺便附上了整个工程代码）
主程序源码如下：
/* * 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_irq.h>
//———Global constants———#define N 10
//———Global data definition———
MCBSP_Config ConfigLoopBack32= { MCBSP_SPCR1_RMK( MCBSP_SPCR1_DLB_ON, /* DLB = 1 */ MCBSP_SPCR1_RJUST_RZF, /* RJUST = 0 */ MCBSP_SPCR1_CLKSTP_DISABLE, /* CLKSTP = 0 */ MCBSP_SPCR1_DXENA_NA, /* DXENA = 0 */ MCBSP_SPCR1_ABIS_DISABLE, /* ABIS = 0 */ MCBSP_SPCR1_RINTM_RRDY, /* RINTM = 0 */ 0, /* RSYNCER = 0 */ MCBSP_SPCR1_RRST_DISABLE /* RRST = 0 */ ), MCBSP_SPCR2_RMK( MCBSP_SPCR2_FREE_NO, /* FREE = 0 */ MCBSP_SPCR2_SOFT_NO, /* SOFT = 0 */ MCBSP_SPCR2_FRST_RESET, /* FRST = 0 */ MCBSP_SPCR2_GRST_RESET, /* GRST = 0 */ MCBSP_SPCR2_XINTM_XRDY, /* XINTM = 0 */ 0, /* XSYNCER = N/A */ MCBSP_SPCR2_XRST_DISABLE /* XRST = 0 */ ), MCBSP_RCR1_RMK( MCBSP_RCR1_RFRLEN1_OF(0), /* RFRLEN1 = 0 */ MCBSP_RCR1_RWDLEN1_32BIT /* RWDLEN1 = 5 */ ), MCBSP_RCR2_RMK( MCBSP_RCR2_RPHASE_SINGLE, /* RPHASE = 0 */ MCBSP_RCR2_RFRLEN2_OF(0), /* RFRLEN2 = 0 */ MCBSP_RCR2_RWDLEN2_8BIT, /* RWDLEN2 = 0 */ MCBSP_RCR2_RCOMPAND_MSB, /* RCOMPAND = 0 */ MCBSP_RCR2_RFIG_YES, /* RFIG = 0 */ MCBSP_RCR2_RDATDLY_2BIT /* RDATDLY = 0 */ ), MCBSP_XCR1_RMK( MCBSP_XCR1_XFRLEN1_OF(0), /* XFRLEN1 = 0 */ MCBSP_XCR1_XWDLEN1_32BIT /* XWDLEN1 = 5 */ ), MCBSP_XCR2_RMK( MCBSP_XCR2_XPHASE_SINGLE, /* XPHASE = 0 */ MCBSP_XCR2_XFRLEN2_OF(0), /* XFRLEN2 = 0 */ MCBSP_XCR2_XWDLEN2_8BIT, /* XWDLEN2 = 0 */ MCBSP_XCR2_XCOMPAND_MSB, /* XCOMPAND = 0 */ MCBSP_XCR2_XFIG_YES, /* XFIG = 0 */ MCBSP_XCR2_XDATDLY_2BIT /* XDATDLY = 0 */ ), MCBSP_SRGR1_RMK( MCBSP_SRGR1_FWID_OF(1), /* FWID = 1 */ MCBSP_SRGR1_CLKGDV_OF(1) /* CLKGDV = 1 */ ), MCBSP_SRGR2_RMK( MCBSP_SRGR2_GSYNC_FREE, /* FREE = 0 */ MCBSP_SRGR2_CLKSP_RISING, /* CLKSP = 0 */ MCBSP_SRGR2_CLKSM_INTERNAL, /* CLKSM = 1 */ MCBSP_SRGR2_FSGM_DXR2XSR, /* FSGM = 0 */ MCBSP_SRGR2_FPER_OF(15) /* FPER = 0 */ ), MCBSP_MCR1_DEFAULT, MCBSP_MCR2_DEFAULT, MCBSP_PCR_RMK( MCBSP_PCR_IDLEEN_RESET, /* IDLEEN = 0 */ MCBSP_PCR_XIOEN_SP, /* XIOEN = 0 */ MCBSP_PCR_RIOEN_SP, /* RIOEN = 0 */ MCBSP_PCR_FSXM_INTERNAL, /* FSXM = 1 */ MCBSP_PCR_FSRM_EXTERNAL, /* FSRM = 0 */ MCBSP_PCR_CLKXM_OUTPUT, /* CLKXM = 1 */ MCBSP_PCR_CLKRM_INPUT, /* CLKRM = 0 */ MCBSP_PCR_SCLKME_NO, /* SCLKME = 0 */ 0, /* DXSTAT = N/A */ MCBSP_PCR_FSXP_ACTIVEHIGH, /* FSXP = 0 */ MCBSP_PCR_FSRP_ACTIVEHIGH, /* FSRP = 0 */ MCBSP_PCR_CLKXP_RISING, /* CLKXP = 0 */ MCBSP_PCR_CLKRP_FALLING /* CLKRP = 0 */ ), 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};
/* Define a MCBSP_Handle object to be used with MCBSP_open function */MCBSP_Handle mhMcbsp;Uint32 xmt[N], rcv[N];volatile Uint16 XfrCnt = 0;Uint16 err = 0;Uint16 old_intm;Uint16 rcvEventId, xmtEventId;
//———Function prototypes———
/* Reference start of interrupt vector table *//* This symbol is defined in file, vectors.s55 */extern void VECSTART(void);
// Interrupt Service Routine Prototypesinterrupt void writeIsr(void); interrupt void readIsr(void);
void taskFxn(void);
//———main routine——— void main(void){ Uint16 i;
/* Initialize CSL library – This is REQUIRED !!! */ CSL_init(); /* Set IVPD/IVPH to start of interrupt vector location */ printf("%d\n", &VECSTART); IRQ_setVecs((Uint32)(&VECSTART));
for (i = 0; i <= N – 1; i++) { xmt[i] = ((Uint32)i << 17) + i; rcv[i] = 0; }
/* Call function to effect transfer */ taskFxn();}
void taskFxn(void){ Uint16 i;
old_intm = IRQ_globalDisable(); /* Open MCBSP Port 0 and set registers to their power on defaults */ mhMcbsp = MCBSP_open(MCBSP_PORT0, MCBSP_OPEN_RESET);
/* Get EventId's associated with MCBSP Port 0 receive and transmit */ /* The event Id's are used to communicate with the CSL interrupt */ /* module functions. */ rcvEventId = MCBSP_getRcvEventId(mhMcbsp); xmtEventId = MCBSP_getXmtEventId(mhMcbsp); /* Clear any pending receive or transmit interrupts */ IRQ_clear(rcvEventId); IRQ_clear(xmtEventId); /* Place address of interrupt service routines at */ /* associated vector location */ IRQ_plug(rcvEventId, *readIsr); IRQ_plug(xmtEventId, *writeIsr); /* Write values from configuration structure to MCBSP control regs */ MCBSP_config(mhMcbsp, &ConfigLoopBack32);
/* Enable the MCBSP receive and transmit interrupts */ IRQ_enable(rcvEventId); IRQ_enable(xmtEventId);
/* 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 ); /* Prime MCBSP transmit */ while(!MCBSP_xrdy(mhMcbsp)){ ; } MCBSP_write32(mhMcbsp,xmt[XfrCnt]); /* Enable all masked interrupts */ IRQ_globalEnable(); /* Wait for transfer of data */ while (XfrCnt < 10) { ; } /*——————————————*\ * Compare values \*——————————————*/ for(i = 0; i <= N – 1; i++){ if (rcv[i] != xmt[i]){ ++err; break; } }
printf ("%s\n",err?"TEST FAILED" : "TEST PASSED");
/* Restore old value of INTM */ IRQ_globalRestore(old_intm); /* We're done with MCBSP, so close it */ MCBSP_close(mhMcbsp); }
interrupt void writeIsr(void){ /* * Disable this ISR's interrupt before the write to the McBSP * since another interrupt will be generated as soon as the write * completes, which happens very quickly due to the loopback to * the McBSP receive. */ IRQ_disable(xmtEventId); MCBSP_write32(mhMcbsp,xmt[XfrCnt]);}
interrupt void readIsr(void){ rcv[XfrCnt] = MCBSP_read32(mhMcbsp); ++XfrCnt; if (XfrCnt == N) { IRQ_disable(rcvEventId); IRQ_disable(xmtEventId); MCBSP_reset(mhMcbsp); } else { IRQ_enable(xmtEventId); }}
经过调试发现，在第二次数据传送过程中，发数据中断服务函数（黄色）并没有执行，而是直接执行了收数据中断服务函数（绿色），所以收端的第二个数据有误（如下图所示）
哪位大神知道这是为什么吗？
