C6711 + PCM3003 delay issue

Hi,

while developing an acoustical feedback system for a guitar, a friend and
I ha ve run into trouble. Our simple "feed input to output" test program
gets an unintentinal delay of 33 samples (@24kHz). This is causing a lot
of problems for us, can anyone see what is wrong with the code?

#include
#include "c6211dsk.h"
int OutL,InL;
int OutR,InR;
int data_in, data_out;
int save[1000];
int COUNT=0;
void codec_config();
void init_HWI();
void process();
void init_process();

int main()
{
init_process();
codec_config();
init_HWI();
return(0);
}

void McBSP1_write(int out_data)
{
int temp;
temp = *(unsigned volatile int *)McBSP1_SPCR & 0x20000;
while ( temp == 0)
{
temp = *(unsigned volatile int *)McBSP1_SPCR & 0x20000;
}
// *(unsigned volatile int *)McBSP1_DXR = out_data;
*(volatile int *)McBSP1_DXR = out_data;
}

int McBSP1_read()
{
int temp;
temp = *(unsigned volatile int *)McBSP1_SPCR & 0x2;
while ( temp == 0)
{
temp = *(unsigned volatile int *)McBSP1_SPCR & 0x2;
}
// temp = *(unsigned volatile int *)McBSP1_DRR;
temp = *(volatile int *)McBSP1_DRR;
return temp;
}

void init_HWI()
{
IRQ_globalEnable();
IRQ_enable(IRQ_EVT_RINT1); // Enable the McBSP1 interrupt
}

/* McBSP1 receive Interupt service routine */
void RINT1_HWI()
{
data_in = McBSP1_read(); // Data is 32 bits
/* 16 LSB are right channel
* 16 MSB are left channel
*/
InL = (short) ((data_in & ~0xFFFF)>>16);
InR = (short) (data_in & 0xFFFF);
process(); // Do processing
data_out = ((OutL & 0xFFFF)<<16) |
(OutR & 0xFFFF);
McBSP1_write(data_out);
}

void codec_config()
{
/* set up McBSP1 which is connected to the audio codec
*/
*(unsigned volatile int *)McBSP1_SPCR = 0; /* reset serial port
*/
*(unsigned volatile int *)McBSP1_PCR = 0x000C; /* set pin control
reg.; */
*(unsigned volatile int *)McBSP1_RCR = 0xA0; /* 0bit delay,set
rx control reg. one 16 bit data/frame */
*(unsigned volatile int *)McBSP1_XCR = 0xA0; /* 0bit delay, set
tx control reg. one 16 bit data/frame */
*(unsigned volatile int *)McBSP1_DXR = 0; /* write first word */
*(unsigned volatile int *)McBSP1_SPCR = 0x10001; /* setup SP
control reg., take out of reset, w RJUST=0; */
return ;
}
void init_process(){
return;
}
void process(){

OutL = InL; // Feed left and right channel back to output
OutR = InR; //
}

* FILENAME
* c6211dsk.h
*/

/* Register definitions for C6211 chip on DSK */

/* Define EMIF Registers */
#define EMIF_GCR 0x1800000 /* Address of EMIF global control */
#define EMIF_CE0 0x1800008 /* Address of EMIF CE0 control */
#define EMIF_CE1 0x1800004 /* Address of EMIF CE1 control */
#define EMIF_SDCTRL 0x1800018 /* Address of EMIF SDRAM control */
#define EMIF_SDRP 0x180001c /* Address of EMIF SDRM refresh period */
#define EMIF_SDEXT 0x1800020 /* Address of EMIF SDRAM extension */

/* Define McBSP0 Registers */
#define McBSP0_DRR 0x18c0000 /* Address of data receive reg.
*/
#define McBSP0_DXR 0x18c0004 /* Address of data transmit reg.
*/
#define McBSP0_SPCR 0x18c0008 /* Address of serial port contl. reg.
*/
#define McBSP0_RCR 0x18c000C /* Address of receive control reg.
*/
#define McBSP0_XCR 0x18c0010 /* Address of transmit control reg.
*/
#define McBSP0_SRGR 0x18c0014 /* Address of sample rate generator
*/
#define McBSP0_MCR 0x18c0018 /* Address of multichannel reg.
*/
#define McBSP0_RCER 0x18c001C /* Address of receive channel enable.
*/
#define McBSP0_XCER 0x18c0020 /* Address of transmit channel enable.
*/
#define McBSP0_PCR 0x18c0024 /* Address of pin control reg.
*/

/* Define McBSP1 Registers */
#define McBSP1_DRR 0x1900000 /* Address of data receive reg.
*/
#define McBSP1_DXR 0x1900004 /* Address of data transmit reg.
*/
#define McBSP1_SPCR 0x1900008 /* Address of serial port contl. reg.
*/
#define McBSP1_RCR 0x190000C /* Address of receive control reg.
*/
#define McBSP1_XCR 0x1900010 /* Address of transmit control reg.
*/
#define McBSP1_SRGR 0x1900014 /* Address of sample rate generator
*/
#define McBSP1_MCR 0x1900018 /* Address of multichannel reg.
*/
#define McBSP1_RCER 0x190001C /* Address of receive channel enable.
*/
#define McBSP1_XCER 0x1900020 /* Address of transmit channel enable.
*/
#define McBSP1_PCR 0x1900024 /* Address of pin control reg.
*/

/* Define L2 Cache Registers */
#define L2CFG 0x1840000 /* Address of L2 config reg
*/
#define MAR0 0x1848200 /* Address of mem attribute reg
*/

/* Define Interrupt Registers */
#define IMH 0x19c0000 /* Address of Interrupt Multiplexer
High*/
#define IML 0x19c0004 /* Address of Interrupt Multiplexer
Low */

/* Define Timer0 Registers */
#define TIMER0_CTRL 0x1940000 /* Address of timer0 control reg. */
#define TIMER0_PRD 0x1940004 /* Address of timer0 period reg. */
#define TIMER0_COUNT 0x1940008 /* Address of timer0 counter reg. */

/* Define Timer1 Registers */
#define TIMER1_CTRL 0x1980000 /* Address of timer1 control reg. */
#define TIMER1_PRD 0x1980004 /* Address of timer1 period reg. */
#define TIMER1_COUNT 0x1980008 /* Address of timer1 counter reg. */

/* Define EDMA Registers */
#define PQSR 0x01A0FFE0 /* Address of priority queue status */
#define CIPR 0x01A0FFE4 /* Address of channel interrupt pending */
#define CIER 0x01A0FFE8 /* Address of channel interrupt enable */
#define CCER 0x01A0FFEC /* Address of channel chain enable */
#define ER 0x01A0FFF0 /* Address of event register */
#define EER 0x01A0FFF4 /* Address of event enable register */
#define ECR 0x01A0FFF8 /* Address of event clear register */
#define ESR 0x01A0FFFC /* Address of event set register */

/* Define EDMA Transfer Parameter Entry Fields */
#define OPT 0*4 /* Options Parameter */
#define SRC 1*4 /* SRC Address Parameter */
#define CNT 2*4 /* Count Parameter */
#define DST 3*4 /* DST Address Parameter */
#define IDX 4*4 /* IDX Parameter */
#define LNK 5*4 /* LNK Parameter */

/* Define EDMA Parameter RAM Addresses */
#define EVENT0_PARAMS 0x01A00000
#define EVENT1_PARAMS EVENT0_PARAMS + 0x18
#define EVENT2_PARAMS EVENT1_PARAMS + 0x18
#define EVENT3_PARAMS EVENT2_PARAMS + 0x18
#define EVENT4_PARAMS EVENT3_PARAMS + 0x18
#define EVENT5_PARAMS EVENT4_PARAMS + 0x18
#define EVENT6_PARAMS EVENT5_PARAMS + 0x18
#define EVENT7_PARAMS EVENT6_PARAMS + 0x18
#define EVENT8_PARAMS EVENT7_PARAMS + 0x18
#define EVENT9_PARAMS EVENT8_PARAMS + 0x18
#define EVENTA_PARAMS EVENT9_PARAMS + 0x18
#define EVENTB_PARAMS EVENTA_PARAMS + 0x18
#define EVENTC_PARAMS EVENTB_PARAMS + 0x18
#define EVENTD_PARAMS EVENTC_PARAMS + 0x18
#define EVENTE_PARAMS EVENTD_PARAMS + 0x18
#define EVENTF_PARAMS EVENTE_PARAMS + 0x18
#define EVENTN_PARAMS EVENTF_PARAMS + 0x18
#define EVENTO_PARAMS EVENTN_PARAMS + 0x18

/* Define QDMA Memory Mapped Registers */
#define QDMA_OPT 0x02000000 /* Address of QDMA options register */
#define QDMA_SRC 0x02000004 /* Address of QDMA SRC address register */
#define QDMA_CNT 0x02000008 /* Address of QDMA counts register */
#define QDMA_DST 0x0200000C /* Address of QDMA DST address register */
#define QDMA_IDX 0x02000010 /* Address of QDMA index register */

/* Define QDMA Pseudo Registers */
#define QDMA_S_OPT 0x02000020 /* Address of QDMA options register */
#define QDMA_S_SRC 0x02000024 /* Address of QDMA SRC address register */
#define QDMA_S_CNT 0x02000028 /* Address of QDMA counts register */
#define QDMA_S_DST 0x0200002C /* Address of QDMA DST address register */
#define QDMA_S_IDX 0x02000030 /* Address of QDMA index register */

/* Definitions for the DSK Board and SW */
#define PI 3.1415926
#define IO_PORT 0x90080000 /* I/O port Address,top byte valid data */
#define INTERNAL_MEM_SIZE (0x4000)>>2
#define EXTERNAL_MEM_SIZE (0x400000)>>2
#define FLASH_SIZE 0x20000
#define POST_SIZE 0x10000
#define FLASH_WRITE_SIZE 0x80
#define INTERNAL_MEM_START 0xc000
#define EXTERNAL_MEM_START 0x80000000
#define FLASH_START 0x90000000
#define POST_END 0x90010000
#define FLASH_ADR1 0x90005555
#define FLASH_ADR2 0x90002AAA
#define FLASH_KEY1 0xAA
#define FLASH_KEY2 0x55
#define FLASH_KEY3 0xA0
#define ALL_A 0xaaaaaaaa
#define ALL_5 0x55555555
#define CE1_8 0xffffff03 /* reg to set CE1 as 8bit async */
#define CE1_32 0xffffff23 /* reg to set CE1 as 32bit async */ Start a New Thread

Magnus-

> while developing an acoustical feedback system for a guitar, a friend and
> I ha ve run into trouble. Our simple "feed input to output" test program
> gets an unintentinal delay of 33 samples (@24kHz). This is causing a lot
> of problems for us, can anyone see what is wrong with the code?

The converters on the PCM3003 daughtercard use sigma-delta technology, which is based on built-in FIR filters to
achieve both higher SNR and bandlimited response. To explain your test results, my guess is that both the input and
output converters have 16 sample delay, and the additional sample comes from software loopback.

To verify this, I suggest that you check the data sheets for the converter chip used on the PCM3003.

-Jeff
> #include
> #include "c6211dsk.h"
> int OutL,InL;
> int OutR,InR;
> int data_in, data_out;
> int save[1000];
> int COUNT=0;
> void codec_config();
> void init_HWI();
> void process();
> void init_process();
>
> int main()
> {
> init_process();
> codec_config();
> init_HWI();
> return(0);
> }
>
> void McBSP1_write(int out_data)
> {
> int temp;
> temp = *(unsigned volatile int *)McBSP1_SPCR & 0x20000;
> while ( temp == 0)
> {
> temp = *(unsigned volatile int *)McBSP1_SPCR & 0x20000;
> }
> // *(unsigned volatile int *)McBSP1_DXR = out_data;
> *(volatile int *)McBSP1_DXR = out_data;
> }
>
> int McBSP1_read()
> {
> int temp;
> temp = *(unsigned volatile int *)McBSP1_SPCR & 0x2;
> while ( temp == 0)
> {
> temp = *(unsigned volatile int *)McBSP1_SPCR & 0x2;
> }
> // temp = *(unsigned volatile int *)McBSP1_DRR;
> temp = *(volatile int *)McBSP1_DRR;
> return temp;
> }
>
> void init_HWI()
> {
> IRQ_globalEnable();
> IRQ_enable(IRQ_EVT_RINT1); // Enable the McBSP1 interrupt
> }
>
> /* McBSP1 receive Interupt service routine */
> void RINT1_HWI()
> {
> data_in = McBSP1_read(); // Data is 32 bits
> /* 16 LSB are right channel
> * 16 MSB are left channel
> */
> InL = (short) ((data_in & ~0xFFFF)>>16);
> InR = (short) (data_in & 0xFFFF);
> process(); // Do processing
> data_out = ((OutL & 0xFFFF)<<16) |
> (OutR & 0xFFFF);
> McBSP1_write(data_out);
> }
>
> void codec_config()
> {
> /* set up McBSP1 which is connected to the audio codec
> */
> *(unsigned volatile int *)McBSP1_SPCR = 0; /* reset serial port
> */
> *(unsigned volatile int *)McBSP1_PCR = 0x000C; /* set pin control
> reg.; */
> *(unsigned volatile int *)McBSP1_RCR = 0xA0; /* 0bit delay,set
> rx control reg. one 16 bit data/frame */
> *(unsigned volatile int *)McBSP1_XCR = 0xA0; /* 0bit delay, set
> tx control reg. one 16 bit data/frame */
> *(unsigned volatile int *)McBSP1_DXR = 0; /* write first word */
> *(unsigned volatile int *)McBSP1_SPCR = 0x10001; /* setup SP
> control reg., take out of reset, w RJUST=0; */
> return ;
> }
> void init_process(){
> return;
> }
> void process(){
>
> OutL = InL; // Feed left and right channel back to output
> OutR = InR; //
> }
>
> * FILENAME
> * c6211dsk.h
> */
>
> /* Register definitions for C6211 chip on DSK */
>
> /* Define EMIF Registers */
> #define EMIF_GCR 0x1800000 /* Address of EMIF global control */
> #define EMIF_CE0 0x1800008 /* Address of EMIF CE0 control */
> #define EMIF_CE1 0x1800004 /* Address of EMIF CE1 control */
> #define EMIF_SDCTRL 0x1800018 /* Address of EMIF SDRAM control */
> #define EMIF_SDRP 0x180001c /* Address of EMIF SDRM refresh period */
> #define EMIF_SDEXT 0x1800020 /* Address of EMIF SDRAM extension */
>
> /* Define McBSP0 Registers */
> #define McBSP0_DRR 0x18c0000 /* Address of data receive reg.
> */
> #define McBSP0_DXR 0x18c0004 /* Address of data transmit reg.
> */
> #define McBSP0_SPCR 0x18c0008 /* Address of serial port contl. reg.
> */
> #define McBSP0_RCR 0x18c000C /* Address of receive control reg.
> */
> #define McBSP0_XCR 0x18c0010 /* Address of transmit control reg.
> */
> #define McBSP0_SRGR 0x18c0014 /* Address of sample rate generator
> */
> #define McBSP0_MCR 0x18c0018 /* Address of multichannel reg.
> */
> #define McBSP0_RCER 0x18c001C /* Address of receive channel enable.
> */
> #define McBSP0_XCER 0x18c0020 /* Address of transmit channel enable.
> */
> #define McBSP0_PCR 0x18c0024 /* Address of pin control reg.
> */
>
> /* Define McBSP1 Registers */
> #define McBSP1_DRR 0x1900000 /* Address of data receive reg.
> */
> #define McBSP1_DXR 0x1900004 /* Address of data transmit reg.
> */
> #define McBSP1_SPCR 0x1900008 /* Address of serial port contl. reg.
> */
> #define McBSP1_RCR 0x190000C /* Address of receive control reg.
> */
> #define McBSP1_XCR 0x1900010 /* Address of transmit control reg.
> */
> #define McBSP1_SRGR 0x1900014 /* Address of sample rate generator
> */
> #define McBSP1_MCR 0x1900018 /* Address of multichannel reg.
> */
> #define McBSP1_RCER 0x190001C /* Address of receive channel enable.
> */
> #define McBSP1_XCER 0x1900020 /* Address of transmit channel enable.
> */
> #define McBSP1_PCR 0x1900024 /* Address of pin control reg.
> */
>
> /* Define L2 Cache Registers */
> #define L2CFG 0x1840000 /* Address of L2 config reg
> */
> #define MAR0 0x1848200 /* Address of mem attribute reg
> */
>
> /* Define Interrupt Registers */
> #define IMH 0x19c0000 /* Address of Interrupt Multiplexer
> High*/
> #define IML 0x19c0004 /* Address of Interrupt Multiplexer
> Low */
>
> /* Define Timer0 Registers */
> #define TIMER0_CTRL 0x1940000 /* Address of timer0 control reg. */
> #define TIMER0_PRD 0x1940004 /* Address of timer0 period reg. */
> #define TIMER0_COUNT 0x1940008 /* Address of timer0 counter reg. */
>
> /* Define Timer1 Registers */
> #define TIMER1_CTRL 0x1980000 /* Address of timer1 control reg. */
> #define TIMER1_PRD 0x1980004 /* Address of timer1 period reg. */
> #define TIMER1_COUNT 0x1980008 /* Address of timer1 counter reg. */
>
> /* Define EDMA Registers */
> #define PQSR 0x01A0FFE0 /* Address of priority queue status */
> #define CIPR 0x01A0FFE4 /* Address of channel interrupt pending */
> #define CIER 0x01A0FFE8 /* Address of channel interrupt enable */
> #define CCER 0x01A0FFEC /* Address of channel chain enable */
> #define ER 0x01A0FFF0 /* Address of event register */
> #define EER 0x01A0FFF4 /* Address of event enable register */
> #define ECR 0x01A0FFF8 /* Address of event clear register */
> #define ESR 0x01A0FFFC /* Address of event set register */
>
> /* Define EDMA Transfer Parameter Entry Fields */
> #define OPT 0*4 /* Options Parameter */
> #define SRC 1*4 /* SRC Address Parameter */
> #define CNT 2*4 /* Count Parameter */
> #define DST 3*4 /* DST Address Parameter */
> #define IDX 4*4 /* IDX Parameter */
> #define LNK 5*4 /* LNK Parameter */
>
> /* Define EDMA Parameter RAM Addresses */
> #define EVENT0_PARAMS 0x01A00000
> #define EVENT1_PARAMS EVENT0_PARAMS + 0x18
> #define EVENT2_PARAMS EVENT1_PARAMS + 0x18
> #define EVENT3_PARAMS EVENT2_PARAMS + 0x18
> #define EVENT4_PARAMS EVENT3_PARAMS + 0x18
> #define EVENT5_PARAMS EVENT4_PARAMS + 0x18
> #define EVENT6_PARAMS EVENT5_PARAMS + 0x18
> #define EVENT7_PARAMS EVENT6_PARAMS + 0x18
> #define EVENT8_PARAMS EVENT7_PARAMS + 0x18
> #define EVENT9_PARAMS EVENT8_PARAMS + 0x18
> #define EVENTA_PARAMS EVENT9_PARAMS + 0x18
> #define EVENTB_PARAMS EVENTA_PARAMS + 0x18
> #define EVENTC_PARAMS EVENTB_PARAMS + 0x18
> #define EVENTD_PARAMS EVENTC_PARAMS + 0x18
> #define EVENTE_PARAMS EVENTD_PARAMS + 0x18
> #define EVENTF_PARAMS EVENTE_PARAMS + 0x18
> #define EVENTN_PARAMS EVENTF_PARAMS + 0x18
> #define EVENTO_PARAMS EVENTN_PARAMS + 0x18
>
> /* Define QDMA Memory Mapped Registers */
> #define QDMA_OPT 0x02000000 /* Address of QDMA options register */
> #define QDMA_SRC 0x02000004 /* Address of QDMA SRC address register */
> #define QDMA_CNT 0x02000008 /* Address of QDMA counts register */
> #define QDMA_DST 0x0200000C /* Address of QDMA DST address register */
> #define QDMA_IDX 0x02000010 /* Address of QDMA index register */
>
> /* Define QDMA Pseudo Registers */
> #define QDMA_S_OPT 0x02000020 /* Address of QDMA options register */
> #define QDMA_S_SRC 0x02000024 /* Address of QDMA SRC address register */
> #define QDMA_S_CNT 0x02000028 /* Address of QDMA counts register */
> #define QDMA_S_DST 0x0200002C /* Address of QDMA DST address register */
> #define QDMA_S_IDX 0x02000030 /* Address of QDMA index register */
>
> /* Definitions for the DSK Board and SW */
> #define PI 3.1415926
> #define IO_PORT 0x90080000 /* I/O port Address,top byte valid data */
> #define INTERNAL_MEM_SIZE (0x4000)>>2
> #define EXTERNAL_MEM_SIZE (0x400000)>>2
> #define FLASH_SIZE 0x20000
> #define POST_SIZE 0x10000
> #define FLASH_WRITE_SIZE 0x80
> #define INTERNAL_MEM_START 0xc000
> #define EXTERNAL_MEM_START 0x80000000
> #define FLASH_START 0x90000000
> #define POST_END 0x90010000
> #define FLASH_ADR1 0x90005555
> #define FLASH_ADR2 0x90002AAA
> #define FLASH_KEY1 0xAA
> #define FLASH_KEY2 0x55
> #define FLASH_KEY3 0xA0
> #define ALL_A 0xaaaaaaaa
> #define ALL_5 0x55555555
> #define CE1_8 0xffffff03 /* reg to set CE1 as 8bit async */
> #define CE1_32 0xffffff23 /* reg to set CE1 as 32bit async */ Start a New Thread