I am working on code of McBSP as UART provided in SPRA633. It transmits well,
but during reception first character is reecived correctly, second and onward
characters are not received correctly.
I think after receiving first character processor is busy in processing of first
character, when second and onwards character are received.
my code for receiving
/*******************************************************************/
/* void ProcessReceiveData(void) */
/* */
/* This function decodes the data in the receive buffer, "recvbuf" */
/* and strips the framing start (0x0000) and Stop (0xFFFF) words. */
/* It calls the subroutine VoteLogic() to determine each bit of */
/* the ASCII character. It then puts the result in recv_msg. */
/*******************************************************************/
void ProcessReceiveData(void)
{
int i;
unsigned char recv_char = 0;
short cnt = -1;
short recv_val;
unsigned short raw_data;
unsigned short *recvbufptr; /*receive buffer pointer*/
/* Point to the receive buffer */
recvbufptr = (unsigned short *)recvbuf;
/* Process all data in the Receive buffer */
for (i = 0; i < BUFFER_SIZE; i++)
{
recv_char = 0;
/* Process each UART frame */
for (cnt = -1; cnt < 10; cnt++)
{
if(cnt == -1 || cnt == 8 || cnt == 9)
{
/* Ignore Start and Stop bits */
*recvbufptr++;
}
else
{
/* Get 16-bit data from receive buffer */
raw_data = *recvbufptr;
recvbufptr++;
/* get the value of the majority of the bits */
recv_val = VoteLogic(raw_data);
/*put received bit into proper place */
recv_char += recv_val << cnt;
}
} /* end for cnt */
/* A full BYTE is decoded. Put in result: recv_msg[i] */
recv_msg[i] = recv_char;
} /* end for I */
} /* end ProcessReceiveData() function */
Regards,
Zeeshan
_____________________________________
McBSP as UART Receiving problem
Started by ●December 27, 2011
Reply by ●December 27, 20112011-12-27
zeeshan,
A few quick guesses, tempered from my experience.
The sample rate is not the appropriate multiple of the senders baud rate.
The sender is not sending
1 start bit, 8 data bits, no parity, 2 stop bits.
R. Williams
---------- Original Message -----------
From: z...@rocketmail.com
To: c...
Sent: Tue, 27 Dec 2011 00:02:07 -0500
Subject: [c6x] McBSP as UART Receiving problem
> I am working on code of McBSP as UART provided in SPRA633. It
> transmits well, but during reception first character is reecived
> correctly, second and onward characters are not received correctly.
>
> I think after receiving first character processor is busy in
> processing of first character, when second and onwards character are received.
>
> my code for receiving
>
> /*******************************************************************/
> /* void ProcessReceiveData(void) */
> /* */
> /* This function decodes the data in the receive buffer, "recvbuf" */
> /* and strips the framing start (0x0000) and Stop (0xFFFF) words. */
> /* It calls the subroutine VoteLogic() to determine each bit of */
> /* the ASCII character. It then puts the result in recv_msg. */
> /*******************************************************************/
> void ProcessReceiveData(void)
> {
> int i;
> unsigned char recv_char = 0;
> short cnt = -1;
> short recv_val;
> unsigned short raw_data;
> unsigned short *recvbufptr; /*receive buffer pointer*/
> /* Point to the receive buffer */
> recvbufptr = (unsigned short *)recvbuf;
> /* Process all data in the Receive buffer */
> for (i = 0; i < BUFFER_SIZE; i++)
> {
> recv_char = 0;
> /* Process each UART frame */
> for (cnt = -1; cnt < 10; cnt++)
> {
> if(cnt == -1 || cnt == 8 || cnt == 9)
> {
> /* Ignore Start and Stop bits */
> *recvbufptr++;
> }
> else
> {
> /* Get 16-bit data from receive buffer */
> raw_data = *recvbufptr;
> recvbufptr++;
> /* get the value of the majority of the bits */
> recv_val = VoteLogic(raw_data);
> /*put received bit into proper place */
> recv_char += recv_val << cnt;
> }
> } /* end for cnt */
> /* A full BYTE is decoded. Put in result: recv_msg[i] */
> recv_msg[i] = recv_char;
> } /* end for I */
> } /* end ProcessReceiveData() function */
>
> Regards,
> Zeeshan
------- End of Original Message -------
_____________________________________
A few quick guesses, tempered from my experience.
The sample rate is not the appropriate multiple of the senders baud rate.
The sender is not sending
1 start bit, 8 data bits, no parity, 2 stop bits.
R. Williams
---------- Original Message -----------
From: z...@rocketmail.com
To: c...
Sent: Tue, 27 Dec 2011 00:02:07 -0500
Subject: [c6x] McBSP as UART Receiving problem
> I am working on code of McBSP as UART provided in SPRA633. It
> transmits well, but during reception first character is reecived
> correctly, second and onward characters are not received correctly.
>
> I think after receiving first character processor is busy in
> processing of first character, when second and onwards character are received.
>
> my code for receiving
>
> /*******************************************************************/
> /* void ProcessReceiveData(void) */
> /* */
> /* This function decodes the data in the receive buffer, "recvbuf" */
> /* and strips the framing start (0x0000) and Stop (0xFFFF) words. */
> /* It calls the subroutine VoteLogic() to determine each bit of */
> /* the ASCII character. It then puts the result in recv_msg. */
> /*******************************************************************/
> void ProcessReceiveData(void)
> {
> int i;
> unsigned char recv_char = 0;
> short cnt = -1;
> short recv_val;
> unsigned short raw_data;
> unsigned short *recvbufptr; /*receive buffer pointer*/
> /* Point to the receive buffer */
> recvbufptr = (unsigned short *)recvbuf;
> /* Process all data in the Receive buffer */
> for (i = 0; i < BUFFER_SIZE; i++)
> {
> recv_char = 0;
> /* Process each UART frame */
> for (cnt = -1; cnt < 10; cnt++)
> {
> if(cnt == -1 || cnt == 8 || cnt == 9)
> {
> /* Ignore Start and Stop bits */
> *recvbufptr++;
> }
> else
> {
> /* Get 16-bit data from receive buffer */
> raw_data = *recvbufptr;
> recvbufptr++;
> /* get the value of the majority of the bits */
> recv_val = VoteLogic(raw_data);
> /*put received bit into proper place */
> recv_char += recv_val << cnt;
> }
> } /* end for cnt */
> /* A full BYTE is decoded. Put in result: recv_msg[i] */
> recv_msg[i] = recv_char;
> } /* end for I */
> } /* end ProcessReceiveData() function */
>
> Regards,
> Zeeshan
------- End of Original Message -------
_____________________________________
Reply by ●December 27, 20112011-12-27
I am working on code of McBSP as UART provided in SPRA633. It transmits well,
but during reception first character is reecived correctly, second and onward
characters are not received correctly.
>
>I think after receiving first character processor is busy in processing of first character, when second and onwards character are received.
>
>my code for receiving
>
>/*******************************************************************/
>/* void ProcessReceiveData(void) */
>/* */
>/* This function decodes the data in the receive buffer, "recvbuf" */
>/* and strips the framing start (0x0000) and Stop (0xFFFF) words. */
>/* It calls the subroutine VoteLogic() to determine each bit of */
>/* the ASCII character. It then puts the result in recv_msg. */
>/*******************************************************************/
>void ProcessReceiveData(void)
>{
>int i;
>unsigned char recv_char = 0;
>short cnt = -1;
>short recv_val;
>unsigned short raw_data;
>unsigned short *recvbufptr; /*receive buffer pointer*/
>/* Point to the receive buffer */
>recvbufptr = (unsigned short *)recvbuf;
>/* Process all data in the Receive buffer */
> for (i = 0; i < BUFFER_SIZE; i++)
> {
> recv_char = 0;
> /* Process each UART frame */
> for (cnt = -1; cnt < 10; cnt++)
> {
> if(cnt == -1 || cnt == 8 || cnt == 9)
> {
> /* Ignore Start and Stop bits */
> *recvbufptr++;
> }
> else
> {
> /* Get 16-bit data from receive buffer */
> raw_data = *recvbufptr;
> recvbufptr++;
> /* get the value of the majority of the bits */
> recv_val = VoteLogic(raw_data);
> /*put received bit into proper place */
> recv_char += recv_val < < cnt;
> }
> } /* end for cnt */
> /* A full BYTE is decoded. Put in result: recv_msg[i] */
> recv_msg[i] = recv_char;
> } /* end for I */
>} /* end ProcessReceiveData() function */
>
>Regards,
>Zeeshan
>
>_____________________________________
I am using external crystal of 3.6864 MHz, to generate exact baud rate of 9600.
If I am receiving 10 characters and send 10 characters consecutively, not all characters are received well.
If I send 10 characters not consecutively but each time a single character is send to make 10 characters all character are received well.
I am using hyper terminal to send characters to DSK6713 board.
Code for McBSP configeration is below.
void ConfigMcBSP(void)
{
MCBSP_Config mcbspCfg1 = {
/* SPCR Setup */
MCBSP_SPCR_RMK(
MCBSP_SPCR_FREE_YES, /* 1 */
MCBSP_SPCR_SOFT_DEFAULT, /* 0 */
MCBSP_SPCR_FRST_DEFAULT, /* 0 */
MCBSP_SPCR_GRST_DEFAULT, /* 0 */
MCBSP_SPCR_XINTM_XRDY, /* 00 */
MCBSP_SPCR_XSYNCERR_DEFAULT, /* 0 */
MCBSP_SPCR_XRST_DEFAULT, /* 0 */
MCBSP_SPCR_DLB_OFF, /* 0 */
MCBSP_SPCR_RJUST_RZF, /* 00 */
MCBSP_SPCR_CLKSTP_DISABLE, /* 0 */
MCBSP_SPCR_DXENA_OFF, /* 0 */
MCBSP_SPCR_RINTM_RRDY, /* 00 */
MCBSP_SPCR_RSYNCERR_DEFAULT, /* 0 */
MCBSP_SPCR_RRST_DEFAULT /* 0 */
),
/* RCR Setup */
MCBSP_RCR_RMK(
MCBSP_RCR_RPHASE_DUAL, /* 1 */
MCBSP_RCR_RFRLEN2_OF(1), /* 00010 */
MCBSP_RCR_RWDLEN2_8BIT, /* 000 */
MCBSP_RCR_RCOMPAND_MSB, /* 00 */
MCBSP_RCR_RFIG_YES, /* 1 */
MCBSP_RCR_RDATDLY_1BIT, /* 01 */ // 0 delay
MCBSP_RCR_RFRLEN1_OF(8), /* 01000 */
MCBSP_RCR_RWDLEN1_16BIT, /* 010 */
MCBSP_RCR_RWDREVRS_DISABLE /* 0 */
),
/* XCR Setup */
MCBSP_XCR_RMK(
MCBSP_XCR_XPHASE_DUAL, /* 1 */
MCBSP_XCR_XFRLEN2_OF(1), /* 00010 */
MCBSP_XCR_XWDLEN2_8BIT, /* 000 */
MCBSP_XCR_XCOMPAND_MSB, /* 00 */
MCBSP_XCR_XFIG_YES, /* 1 */
MCBSP_XCR_XDATDLY_0BIT, /* 00 */
MCBSP_XCR_XFRLEN1_OF(8), /* 01000 */
MCBSP_XCR_XWDLEN1_16BIT, /* 010 */
MCBSP_XCR_XWDREVRS_DISABLE /* 0 */
),
/* SRGR Setup */
MCBSP_SRGR_RMK(
MCBSP_SRGR_GSYNC_FREE, /* 0 */
MCBSP_SRGR_CLKSP_RISING, /* 0 */
MCBSP_SRGR_CLKSM_CLKS,
MCBSP_SRGR_FSGM_DXR2XSR, /* 0 */
MCBSP_SRGR_FPER_DEFAULT, /* 0 */
MCBSP_SRGR_FWID_DEFAULT, /* 0 */
MCBSP_SRGR_CLKGDV_OF(23) /* CLKGDV for (baud rate 576002, cpuClk2.5MHz) */
),
/* MCR Setup */
MCBSP_MCR_DEFAULT, /* default values */
/* RCER Setup */
MCBSP_RCER_DEFAULT, /* default values */
/* XCER Setup */
MCBSP_XCER_DEFAULT, /* default values */
/* PCR Setup */
MCBSP_PCR_RMK(
MCBSP_PCR_XIOEN_SP, /* 0 */
MCBSP_PCR_RIOEN_SP, /* 0 */
MCBSP_PCR_FSXM_INTERNAL, /* 1 */
MCBSP_PCR_FSRM_EXTERNAL, /* 0 */
MCBSP_PCR_CLKXM_OUTPUT, /* 1 */
MCBSP_PCR_CLKRM_OUTPUT, /* 1 */
MCBSP_PCR_CLKSSTAT_0, /* 0 */
MCBSP_PCR_DXSTAT_0, /* 0 */
MCBSP_PCR_FSXP_ACTIVELOW, /* 1 */
MCBSP_PCR_FSRP_ACTIVELOW, /* 1 */
MCBSP_PCR_CLKXP_RISING, /* 0 */
MCBSP_PCR_CLKRP_FALLING /* 0 */
)
};
MCBSP_config(hMcbsp1, &mcbspCfg1);
} /* end of Config_McBSP(void) */
Thanks for response.
Regards,
Zeeshan
_____________________________________
>
>I think after receiving first character processor is busy in processing of first character, when second and onwards character are received.
>
>my code for receiving
>
>/*******************************************************************/
>/* void ProcessReceiveData(void) */
>/* */
>/* This function decodes the data in the receive buffer, "recvbuf" */
>/* and strips the framing start (0x0000) and Stop (0xFFFF) words. */
>/* It calls the subroutine VoteLogic() to determine each bit of */
>/* the ASCII character. It then puts the result in recv_msg. */
>/*******************************************************************/
>void ProcessReceiveData(void)
>{
>int i;
>unsigned char recv_char = 0;
>short cnt = -1;
>short recv_val;
>unsigned short raw_data;
>unsigned short *recvbufptr; /*receive buffer pointer*/
>/* Point to the receive buffer */
>recvbufptr = (unsigned short *)recvbuf;
>/* Process all data in the Receive buffer */
> for (i = 0; i < BUFFER_SIZE; i++)
> {
> recv_char = 0;
> /* Process each UART frame */
> for (cnt = -1; cnt < 10; cnt++)
> {
> if(cnt == -1 || cnt == 8 || cnt == 9)
> {
> /* Ignore Start and Stop bits */
> *recvbufptr++;
> }
> else
> {
> /* Get 16-bit data from receive buffer */
> raw_data = *recvbufptr;
> recvbufptr++;
> /* get the value of the majority of the bits */
> recv_val = VoteLogic(raw_data);
> /*put received bit into proper place */
> recv_char += recv_val < < cnt;
> }
> } /* end for cnt */
> /* A full BYTE is decoded. Put in result: recv_msg[i] */
> recv_msg[i] = recv_char;
> } /* end for I */
>} /* end ProcessReceiveData() function */
>
>Regards,
>Zeeshan
>
>_____________________________________
I am using external crystal of 3.6864 MHz, to generate exact baud rate of 9600.
If I am receiving 10 characters and send 10 characters consecutively, not all characters are received well.
If I send 10 characters not consecutively but each time a single character is send to make 10 characters all character are received well.
I am using hyper terminal to send characters to DSK6713 board.
Code for McBSP configeration is below.
void ConfigMcBSP(void)
{
MCBSP_Config mcbspCfg1 = {
/* SPCR Setup */
MCBSP_SPCR_RMK(
MCBSP_SPCR_FREE_YES, /* 1 */
MCBSP_SPCR_SOFT_DEFAULT, /* 0 */
MCBSP_SPCR_FRST_DEFAULT, /* 0 */
MCBSP_SPCR_GRST_DEFAULT, /* 0 */
MCBSP_SPCR_XINTM_XRDY, /* 00 */
MCBSP_SPCR_XSYNCERR_DEFAULT, /* 0 */
MCBSP_SPCR_XRST_DEFAULT, /* 0 */
MCBSP_SPCR_DLB_OFF, /* 0 */
MCBSP_SPCR_RJUST_RZF, /* 00 */
MCBSP_SPCR_CLKSTP_DISABLE, /* 0 */
MCBSP_SPCR_DXENA_OFF, /* 0 */
MCBSP_SPCR_RINTM_RRDY, /* 00 */
MCBSP_SPCR_RSYNCERR_DEFAULT, /* 0 */
MCBSP_SPCR_RRST_DEFAULT /* 0 */
),
/* RCR Setup */
MCBSP_RCR_RMK(
MCBSP_RCR_RPHASE_DUAL, /* 1 */
MCBSP_RCR_RFRLEN2_OF(1), /* 00010 */
MCBSP_RCR_RWDLEN2_8BIT, /* 000 */
MCBSP_RCR_RCOMPAND_MSB, /* 00 */
MCBSP_RCR_RFIG_YES, /* 1 */
MCBSP_RCR_RDATDLY_1BIT, /* 01 */ // 0 delay
MCBSP_RCR_RFRLEN1_OF(8), /* 01000 */
MCBSP_RCR_RWDLEN1_16BIT, /* 010 */
MCBSP_RCR_RWDREVRS_DISABLE /* 0 */
),
/* XCR Setup */
MCBSP_XCR_RMK(
MCBSP_XCR_XPHASE_DUAL, /* 1 */
MCBSP_XCR_XFRLEN2_OF(1), /* 00010 */
MCBSP_XCR_XWDLEN2_8BIT, /* 000 */
MCBSP_XCR_XCOMPAND_MSB, /* 00 */
MCBSP_XCR_XFIG_YES, /* 1 */
MCBSP_XCR_XDATDLY_0BIT, /* 00 */
MCBSP_XCR_XFRLEN1_OF(8), /* 01000 */
MCBSP_XCR_XWDLEN1_16BIT, /* 010 */
MCBSP_XCR_XWDREVRS_DISABLE /* 0 */
),
/* SRGR Setup */
MCBSP_SRGR_RMK(
MCBSP_SRGR_GSYNC_FREE, /* 0 */
MCBSP_SRGR_CLKSP_RISING, /* 0 */
MCBSP_SRGR_CLKSM_CLKS,
MCBSP_SRGR_FSGM_DXR2XSR, /* 0 */
MCBSP_SRGR_FPER_DEFAULT, /* 0 */
MCBSP_SRGR_FWID_DEFAULT, /* 0 */
MCBSP_SRGR_CLKGDV_OF(23) /* CLKGDV for (baud rate 576002, cpuClk2.5MHz) */
),
/* MCR Setup */
MCBSP_MCR_DEFAULT, /* default values */
/* RCER Setup */
MCBSP_RCER_DEFAULT, /* default values */
/* XCER Setup */
MCBSP_XCER_DEFAULT, /* default values */
/* PCR Setup */
MCBSP_PCR_RMK(
MCBSP_PCR_XIOEN_SP, /* 0 */
MCBSP_PCR_RIOEN_SP, /* 0 */
MCBSP_PCR_FSXM_INTERNAL, /* 1 */
MCBSP_PCR_FSRM_EXTERNAL, /* 0 */
MCBSP_PCR_CLKXM_OUTPUT, /* 1 */
MCBSP_PCR_CLKRM_OUTPUT, /* 1 */
MCBSP_PCR_CLKSSTAT_0, /* 0 */
MCBSP_PCR_DXSTAT_0, /* 0 */
MCBSP_PCR_FSXP_ACTIVELOW, /* 1 */
MCBSP_PCR_FSRP_ACTIVELOW, /* 1 */
MCBSP_PCR_CLKXP_RISING, /* 0 */
MCBSP_PCR_CLKRP_FALLING /* 0 */
)
};
MCBSP_config(hMcbsp1, &mcbspCfg1);
} /* end of Config_McBSP(void) */
Thanks for response.
Regards,
Zeeshan
_____________________________________
