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最近在做VC5509A的项目，发现之前的工程师配置系统时钟为36Mhz,纳闷为什么这么低，直到看到MCBSP的配置时才发现，选择使用内部时钟作为MCBSP的时钟的话，还真只能用36M，此时SRGR1的CLKGDV的值为234，波特率为9600bps。稍微提高系统时钟CLKGDV的值就溢出了。
这样的话，是不是意味着在使用低波特率时就不能使用高系统时钟？ 
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7 个讨论
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vuywsdfwf 发表于 2019-1-29 06:28 你好，觉得你是高手，想问你一个问题啊，我用FPGA控制DSP，用verilog编写HPI程序时，为什么HRDY信号总是低电平啊？不能写也不能读，这是怎么回事啊？谢谢！ |
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vuywsdfwf 发表于 2019-1-29 06:28 你好，感谢你的回复，FPGA控制dsp也只是通过地址线控制选择HPI的3个寄存器，但是其中的HRDY一直低，其中HPIC我只是写0x00080008应该没问题，但是HPIC也写不进去啊！我想的是只要HDRY正确了一切就好了，问题是我就接了一个礼拜了还找不到问题所在，求大神帮助，以下是时序图！ |
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se6238751 发表于 2019-1-29 06:37 请问你用的是哪款DSP? 另外，有新问题，麻烦到相应的版块发新帖。 |
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vuywsdfwf 发表于 2019-1-29 06:28 谢谢回复。学无止境。 |
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vuywsdfwf 发表于 2019-1-29 06:28 按照这个计算公式的话，McBSP的程序 /*----------------------------------------------------------------------------*/ /* DESCRIPTION: */ /* */ /* This is an example for EMIF of C5509A */ /*----------------------------------------------------------------------------*/ /* MODULE NAME... Mcbsp */ /* FILENAME...... uart.c */ /* DATE CREATED.. Mon 02/4/2004 */ /* COMPONENT..... */ /* PREREQUISITS.. */ /*----------------------------------------------------------------------------*/ /* DESCRIPTION: */ /* */ /* this example is that the software uart is done by Mcbsp */ /*----------------------------------------------------------------------------*/ #include #include #include #include #include #include //设置McBSP的PCR寄存器指针，用于读写其I/O端口 ioport unsigned int *PCR_1=(unsigned int *)0x2c12; #define REG_PCR1 (*PCR_1) /*锁相环的设置*/ PLL_Config myConfig = [ 0, //IAI: the PLL locks using the same process that was underway //before the idle mode was entered 1, //IOB: If the PLL indicates a break in the phase lock, //it switches to its bypass mode and restarts the PLL phase-locking //sequence 12, //PLL multiply value; multiply 12 times 0 //Divide by 1 PLL divide value; it can be either PLL divide value //(when PLL is enabled), or Bypass-mode divide value //(PLL in bypass mode, if PLL multiply value is set to 1) ]; /****************************设置Timer********************************/ /* 参考: TMS320VC5509 DSP Timers Reference Guide TMS320C55x Chip Support Library API Reference Guide (Rev. J) HX-5509A 开发板使用手册 */ //---------Global data definition---------// #define TIMER_CTRL TIMER_TCR_RMK( TIMER_TCR_IDLEEN_DEFAULT, /* IDLEEN == 0 */ TIMER_TCR_FUNC_OF(0), /* FUNC == 0 */ TIMER_TCR_TLB_RESET, /* TLB == 1 */ TIMER_TCR_SOFT_BRKPTNOW, /* SOFT == 0 */ TIMER_TCR_FREE_WITHSOFT, /* FREE == 0 */ TIMER_TCR_PWID_OF(0), /* PWID == 0 */ TIMER_TCR_ARB_RESET, /* ARB == 1 */ TIMER_TCR_TSS_START, /* TSS == 0 */ TIMER_TCR_CP_PULSE, /* CP == 0 */ TIMER_TCR_POLAR_LOW, /* POLAR == 0 */ TIMER_TCR_DATOUT_0 /* DATOUT == 0 */ ) /* Create a TIMER configuration structure that can be passed */ /* to TIMER_config CSL function for initialization of Timer */ /* control registers. */ //产生1ms中断 TIMER_Config timCfg0 = [ TIMER_CTRL, /* TCR0 */ 749, /* PRD0 */ 0x0000 /* PRSC */ ]; /* Create a TIMER_Handle object for use with TIMER_open */ TIMER_Handle mhTimer0; Uint16 eventId0; Uint16 timer0_cnt = 0; int old_intm; Uint16 tim_val; //---------Function prototypes--------- /* Reference start of interrupt vector table */ /* This symbol is defined in file, vectors_timer1.s55 */ extern void VECSTART(void); /* Function/ISR prototypes */ interrupt void timer0Isr(void); /***********************************************************************/ /**************************McBSP1设置成GPIO*****************************/ /* 参考: TMS320C55x DSP Multichannel Buffered Serial Port (McBSP) Reference Guide HX-5509A 开发板使用手册 TMS320C55x Chip Support Library API Reference Guide (Rev. J) */ MCBSP_Config Mcbsptest; MCBSP_Config Mcbsp1Config = [ MCBSP_SPCR1_RMK( MCBSP_SPCR1_DLB_OFF, /* DLB = 0,禁止自闭环方式 */ MCBSP_SPCR1_RJUST_LZF, /* RJUST = 2 */ MCBSP_SPCR1_CLKSTP_DISABLE, /* CLKSTP = 0 */ MCBSP_SPCR1_DXENA_ON, /* DXENA = 1 */ 0, /* 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_FSG, /* FRST = 0 */ MCBSP_SPCR2_GRST_CLKG, /* GRST = 0 */ MCBSP_SPCR2_XINTM_XRDY, /* XINTM = 0 */ 0, /* XSYNCER = N/A */ MCBSP_SPCR2_XRST_DISABLE /* XRST = 0 */ ), /*单数据相，接受数据长度为16位,每相2个数据*/ MCBSP_RCR1_RMK( MCBSP_RCR1_RFRLEN1_OF(1), /* RFRLEN1 = 1 */ MCBSP_RCR1_RWDLEN1_16BIT /* RWDLEN1 = 2 */ ), 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_1BIT /* RDATDLY = 1 */ ), MCBSP_XCR1_RMK( MCBSP_XCR1_XFRLEN1_OF(1), /* XFRLEN1 = 1 */ MCBSP_XCR1_XWDLEN1_16BIT /* XWDLEN1 = 2 */ ), 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_1BIT /* XDATDLY = 1 */ ), MCBSP_SRGR1_DEFAULT, MCBSP_SRGR2_DEFAULT, MCBSP_MCR1_DEFAULT, MCBSP_MCR2_DEFAULT, MCBSP_PCR_RMK( MCBSP_PCR_IDLEEN_RESET, /* IDLEEN = 0 */ MCBSP_PCR_XIOEN_GPIO, /* XIOEN = 1 */ MCBSP_PCR_RIOEN_GPIO, /* RIOEN = 1 */ MCBSP_PCR_FSXM_EXTERNAL, /* FSXM = 0 */ MCBSP_PCR_FSRM_EXTERNAL, /* FSRM = 0 */ MCBSP_PCR_CLKXM_INPUT, /* CLKXM = 0 */ MCBSP_PCR_CLKRM_INPUT, /* CLKRM = 0 */ MCBSP_PCR_SCLKME_NO, /* SCLKME = 0 */ MCBSP_PCR_DXSTAT_1, /* DXSTAT = 1 */ MCBSP_PCR_FSXP_ACTIVEHIGH, /* FSXP = 0 */ MCBSP_PCR_FSRP_ACTIVEHIGH, /* FSRP = 1 */ MCBSP_PCR_CLKXP_FALLING, /* CLKXP = 1 */ MCBSP_PCR_CLKRP_RISING /* CLKRP = 1 */ ), 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 ]; MCBSP_Handle hMcbsp; /***********************************************************************/ Uint16 i,temp; unsigned char timer0_cnten; unsigned char uart_rec, uart_send, uart_recflag, uart_sendflag; unsigned char uart_bitscan, uart_bitcnt, uart_recstart, uart_sendbitcnt; unsigned char uart_bitsend, uart_bitsendcnt, uart_sendcnten, uart_sendend; void delay(Uint32 k) [ while(k--); ] void settimer(void) [ /* Set IVPH/IVPD to start of interrupt vector table */ /*修改寄存器IVPH，IVPD，重新定义中断向量表*/ IRQ_setVecs((Uint32)(&VECSTART)); /* Temporarily disable all maskable interrupts */ old_intm = IRQ_globalDisable(); /* Open Timer 0, set registers to power on defaults */ mhTimer0 = TIMER_open(TIMER_DEV0, TIMER_OPEN_RESET); /* Get Event Id associated with Timer 0, for use with */ /* CSL interrupt enable functions. */ eventId0 = TIMER_getEventId(mhTimer0); /* Clear any pending Timer interrupts */ IRQ_clear(eventId0); /* Place interrupt service routine address at */ /* associated vector location */ IRQ_plug(eventId0,&timer0Isr); /* Write configuration structure values to Timer control regs */ TIMER_config(mhTimer0, &timCfg0); /* Enable Timer interrupt */ IRQ_enable(eventId0); /* Enable all maskable interrupts */ IRQ_globalEnable(); timer0_cnten = 0; uart_bitscan = 0; uart_bitcnt = 0; uart_recstart = 0; uart_recflag = 0; uart_sendflag = 0; /* Start Timer */ TIMER_start(mhTimer0); ] void main(void) [ /* Initialize CSL library - This is REQUIRED !!! */ /*初始化CSL库*/ CSL_init(); /*设置系统的运行速度为144MHz*/ PLL_config(&myConfig); /*初始化McBSP1*/ hMcbsp = MCBSP_open(MCBSP_PORT1,MCBSP_OPEN_RESET); /*设置McBSP1*/ MCBSP_config(hMcbsp,&Mcbsp1Config); MCBSP_getConfig(hMcbsp,&Mcbsptest); settimer(); /*************************以下程序实现软件Uart************************/ /* 参考：HX-5509A 开发板使用手册 */ while(TRUE) [ if(uart_recflag==1) [ uart_recflag = 0; if(uart_sendflag==0) [ uart_bitsendcnt = 0; uart_sendend = 0; uart_sendcnten = 0; uart_bitsend = 0; uart_send = uart_rec; uart_sendflag = 1; uart_sendbitcnt = 0; ] ] ]; ] interrupt void timer0Isr(void) [ temp = REG_PCR1; //Send if(uart_sendflag==1) [ if(uart_sendcnten==0) [ REG_PCR1 &= 0xffdf; uart_bitsend = 1; uart_sendcnten = 1; ] if(uart_sendcnten==1) [ uart_bitsendcnt++; if(uart_bitsendcnt==10) [ uart_sendbitcnt++; if(uart_sendend==1) [ uart_sendflag = 0; ] else [ if(uart_sendbitcnt<9) [ if((uart_send & uart_bitsend)==0) [ REG_PCR1 &= 0xffdf; ] else [ REG_PCR1 |= 0x0020; ] uart_bitsend <<= 1; ] else [ REG_PCR1 |= 0x0020; uart_sendflag = 0; ] ] uart_bitsendcnt = 0; ] ] ] //Receive if((uart_bitcnt==0)&&(uart_recstart==0)) [ if((temp&0x0010)==0) [ timer0_cnt = 0; timer0_cnten = 1; uart_bitscan = 0; uart_rec = 0; uart_recstart = 1; ] ] if(timer0_cnten==1) [ timer0_cnt++; if((temp&0x0010)!=0) [ uart_bitscan++; ] if(timer0_cnt==10) [ timer0_cnt = 0; if(uart_bitscan>5) [ switch(uart_bitcnt) [ case 0: uart_rec = 0; timer0_cnten = 0; uart_recstart = 0; break; case 1: uart_bitcnt++; uart_rec |= 0x01; break; case 2: uart_bitcnt++; uart_rec |= 0x02; break; case 3: uart_bitcnt++; uart_rec |= 0x04; break; case 4: uart_bitcnt++; uart_rec |= 0x08; break; case 5: uart_bitcnt++; uart_rec |= 0x10; break; case 6: uart_bitcnt++; uart_rec |= 0x20; break; case 7: uart_bitcnt++; uart_rec |= 0x40; break; case 8: uart_bitcnt++; uart_rec |= 0x80; break; case 9: uart_bitcnt = 0; timer0_cnten = 0; uart_recflag = 1; uart_recstart = 0; break; default: break; ] ] else [ uart_bitcnt++; if(uart_bitcnt>9) [ uart_bitcnt = 0; timer0_cnten = 0; ] ] uart_bitscan = 0; ] ] ] /****************************************************************************** * End of uart.c ******************************************************************************/ 在这个程序中，CPU Clock frequency的值应该是144MHz，DSP端通过timer设置为192 000，采用10倍过采样，band rate=19200，这样的话计算出来的结果CKLGDV=468大于255，且与配置的MCBSP_SRGR1_DEFAULT运行之后，SRGR1结果为0x0001，这是为什么？ |
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