TMS320C6455 DSK (Setting up McBSP to SPI slave)

nico.syrjalainen

Hello!

We are working on a school project, where we need to set up a SPI connection between NXP Mbed module and this DSP development kit. The DSP should be a slave. We have successfully set up SPI connection between two Mbed kits, so the Mbed should be correctly configured.

We would like to use EDMA Transfer or DMA Transfer.

Our connections:

MBED DSP (J3 peripheral expansion connector)
SCLK ---- Pin 27 (CLKR0)
MOSI ---- Pin 30 (DR0)
MISO ---- Pin 24 (DX0)
CS ---- Pin 29 (FSR0)

We have tried to follow your guides (Spru580g http://www.ti.com/lit/ug/spru580g/spru580g.pdf).

Here are our #Defines

#define   SPCR (*((int *)0x028C0008))
#define   RCR (*((int *)0x028C000C))
#define   XCR (*((int *)0x028C0010))
#define   SRGR (*((int *)0x028C0014))
#define   PCR (*((int *)0x028C0024))
#define   DXR (*((int *)0x028C0004))
#define   DRR (*((int *)0x028C0000))

Our code:

void main()
{

    /* Initialize the board support library, must be called first */
    DSK6455_init();

    /* Initialize LEDs and DIP switches */
    DSK6455_LED_init();
    DSK6455_DIP_init();
	McBSP();
    
    /* Clear buffers */
    memset((void*)gBufferXmtPing,0,sizeof(gBufferXmtPing));
    memset((void*)gBufferXmtPong,0,sizeof(gBufferXmtPong));
    memset((void*)gBufferRcvPing,0,sizeof(gBufferRcvPing));
    memset((void*)gBufferRcvPong,0,sizeof(gBufferRcvPong));



}

void McBSP()
{
	int i;

	SPCR	=	0x00000000;  //mcbsp resettii


	//SPI-SLAVE conffit
	RCR		=	0x00000000;  //kaikki nollina, koska DSP toimii slavena, ja 8 bittia siirretaan kerrallaan, jos olisi A0 lopussa, se tarkottaisi 32 bittia kerrallaan

	XCR		=	0x00000000;

	SRGR	=	0x2000007F;  //THIS WAS THE FAULT SPOT, SRGR REGISTER SHOULD BE 0x20000001

	PCR		=	0x00000000; 

	SPCR	=	0x00001800;


	

	edmaInit();

	SPCR |= 0x00010001;

	for(i=0;i<1000;i++); {
	}
	
		
}

This code is based on your examples. Do you see any fundamental errors? We do not receive any data in the input register (data receive register).

Do you have example codes that we could study?

Thanks for your time!

Edit: Problem solved, data moves just like it should be...

over 13 years ago

0 Sergey Zavyalov over 13 years ago

Prodigy 40 points

Could you share your code?

0 nico.syrjalainen over 13 years ago in reply to Sergey Zavyalov

Prodigy 20 points

#include "dsk6455.h"

#include <std.h>
#include <log.h>
#include <stdio.h> //C kirjasto
#include <csl.h> //Chip support library
#include <hwi.h> //Hardware interrupt
#include <csl_mcbsp.h> //McBSP

#include <c64.h>
void McBSP();

//McBSP defines
#define SPCR (*((int *)0x028C0008)) //Serial Port Control Register
#define RCR (*((int *)0x028C000C)) //Receive Control Register
#define XCR (*((int *)0x028C0010)) //Transmit Control Register
#define SRGR (*((int *)0x028C0014)) //Sample Rate Generator Register
#define PCR (*((int *)0x028C0024)) //Pin Control Register
#define DXR (*((int *)0x028C0004)) //Data Trasmit Register
#define DRR (*((int *)0x028C0000)) //Data Receive Register

void McBSP_init() //main program
{

McBSP(); //call for mcbsp subprogram

}

void McBSP()
{
int j;
SPCR = 0x00000000; //mcbsp to restet

//SPI-SLAVE conf
RCR = 0x00000000; //RCR bits to 0 because SPI SLAVE

XCR = 0x00000000; //XCR bits to 0 because SPI SLAVE

SRGR = 0x20000001; //Enable internal sample rate generator, and set CLKGDV ONE BIT to 1, for all spi speeds

SPCR = 0x00001800; //CLKSTP confs

SPCR |= 0x00400000;

for(j=0;j<1;j++);{
}

SPCR |= 0x00010001;

for(j=0;j<1;j++); {
}

}

This is how it works for me.

0 Sergey Zavyalov over 13 years ago in reply to nico.syrjalainen

Prodigy 40 points

Thanks a lot, it is really useful for me!

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TMS320C6455 DSK (Setting up McBSP to SPI slave)