RE: McBSP usage inside DSP processor

["Guruswamy, Senthilvadivu" <svadivu@ti.com>]

I really don't know if there is any how to example in your package.

I meant the Mcbsp accessible code written on DSP side.  If you are using the CSL, then macros for Mcbsp access also should be available.

If you are able to find the CSL APIs/macros for mcbsp2 on the DSP side, mcbsp1 also shall use the similar APIs.  

-----Original Message-----
From: Diogo Scolari [mailto:diogoscolari@yahoo.com.br] 
Sent: Friday, February 16, 2007 12:33 AM
To: Guruswamy, Senthilvadivu
Cc: lvcargnini@ieee.org; Linux-omap-open-source@linux.omap.com; dspgateway-devel@lists.sourceforge.net
Subject: RE: McBSP usage inside DSP processor

Ok Senthil

What do you mean about the McBSP DSP driver? We are
using the C55 compiler and the CSL includes from
Texas, remenbering we are using the DSPGateway, not
the DSP/BIOS Link.
We want to know if there is an how-to example to based
on.

Thank you.

Diogo

--- "Guruswamy, Senthilvadivu" <svadivu@ti.com>
escreveu:

> IF Mcbsp1 is accessible only by DSP, then it is
> necessary to go for DSP side Mcbsp driver, which
> would be copy of the arm driver except for the
> register addresses.
> 
> If Mcbsp1 is a shared peripheral among ARM and DSP,
> then slight changes in the Arm Mcbsp driver should
> be enough.  In this case, apart from the register
> offsets, the buffer used by the driver should also
> be in Arm/Dsp shared space.
> 
> Regards,
> Senthil.
> 
> -----Original Message-----
> From: Diogo Scolari
> [mailto:diogoscolari@yahoo.com.br] 
> Sent: Thursday, February 15, 2007 11:25 PM
> To: Guruswamy, Senthilvadivu; Luís" "Vitório"
> Cargnini; OMAP;
> dspgateway-devel@lists.sourceforge.net
> Subject: RE: McBSP usage inside DSP processor
> 
> Hi Senthil
> 
> Thank you for your reply.
> 
> We would like to use the McBSP1, which is used by
> DSP
> only. We think we don`t need to modifie the ARM
> driver
> source code. Is this correct? Or we need really
> create
> an application that will run on ARM side to pool the
> McBSP and repass the colected data to DSP side?
> 
> Thanks 
> 
> Diogo 
> 
> --- "Guruswamy, Senthilvadivu" <svadivu@ti.com>
> escreveu:
> 
> > Hi,
> > 
> > 
> > Couple of points to be noted for Mcbsp usage in
> DSP.
> > 	1.  The Mcbsp instance say Mcbsp2 should be a
> > module shared between ARM and DSP, or only for
> DSP.
> > 	2.  If the Mcbsp instance is a shared one among
> > DSP/ARM, then the base address of the Mcbsp to
> > access from DSP would be different from that of
> the
> > arm.  Although the offsets of the registers like
> > pcr, spcr, remain the same.
> > 	3.  The IRQ line also would be obviously
> different
> > for DSP.
> > 
> > All these changes should be made in the arm Mcbsp
> > driver to make it work from DSP.
> > 
> > Regards,
> > Senthil.
> > 
> > -----Original Message-----
> > From:
> linux-omap-open-source-bounces@linux.omap.com
> >
>
[mailto:linux-omap-open-source-bounces@linux.omap.com]
> > On Behalf Of Luís Vitório Cargnini
> > Sent: Tuesday, February 13, 2007 10:46 PM
> > To: OMAP; dspgateway-devel@lists.sourceforge.net
> > Subject: McBSP usage inside DSP processor
> > 
> > Dears:
> > I and my colleague are developing an application
> > that will need to access an
> > AD/DA, from DSP processor, we are trying the McBSP
> > functions MCBSP_init(),
> > read an write and so on. But we are having
> > difficulties on execute this.
> > Someone knows how to access an McBSP inside DSP
> side
> > ?
> > we are using DSPGateway.
> > Something that we note is that MCBSP_init() do not
> > exist and are always
> > generating an error on compilation but CSL_init()
> > works; someone could give
> > some info about it ?
> > 
> > here follow an code been developed by us:
> > #define CHIP_5510PG2_2 1
> > 
> > #include <std.h>
> > #include <stdint.h>
> > #include <math.h>
> > #include <csl.h>
> > #include <csl_dma.h>
> > #include <csl_emif.h>
> > #include <csl_irq.h>
> > #include <csl_timer.h>
> > #include <csl_mcbsp.h>
> > 
> > #include "tokliBIOS.h"
> > 
> > #define MCBSP_DEV0 (0)
> > #define MCBSP_DEV1 (1)
> > #define MCBSP_DEV2 (2)
> > 
> > #define BUFSIZ (0x10000/2)
> > 
> > 
> > int count;
> > void write_isr(void);
> > 
> > MCBSP_Handle fd;
> > MCBSP_Config configuracao = { /*tudo uint16*/
> > 0x0200,      //spcr1
> > 0x1800,      //spcr2
> > 0x0000,      //rcr1
> > 0x0020,      //rcr2
> > 0x0000,      //xcr1
> > 0x0060,      //xcr2
> > 0x3249,      //srgr1
> > 0x03FF,      //srgr2
> > 0x0040,      //mcr1
> > 0x00A0,      //mcr2
> > 0x00E0,      //pcr
> > 0x0000,      //rcera
> > 0x0000,      //rcerb
> > 0x0000,      //rcerc
> > 0x0000,      //rcerd
> > 0x0000,      //rcere
> > 0x0000,      //rcerf
> > 0x0000,      //rcerg
> > 0x0000,       //rcerh
> > 0x0000,       //xcera
> > 0x0000,       //xcerb
> > 0x0000,       //xcerc
> > 0x0000,       //xcerd
> > 0x0000,       //xcere
> > 0x0000,       //xcerf
> > 0x0000,       //xcerg
> > 0x0000       //xcerh
> > };
> > 
> > void write_isr(void)
> > {
> > while(!MCBSP_xrdy(fd));
> > MCBSP_write16(fd, 1);
> > while(!MCBSP_rrdy(fd));
> > count = MCBSP_read16(fd);//o maximo eh 65536
> > }
> > 
> > static Uns mm_rcv_bksnd(struct dsptask *task, Uns
> > bid, Uns cnt)
> > {
> >     Int i;
> >     Uns *ipbp = ipbuf_d[bid];
> >     Uns off, len;
> >     #define OFF    0    /* arbitrary */
> >     Uns bid2;
> >     uint16_t  *addr = task->udata;
> > 
> >     if (cnt != 2)
> >     {
> >         //dbg(task, "[DSP]: illegal data cnt:
> %d\n",
> > cnt);
> >         unuse_ipbuf(task, bid);
> >         return 0;
> >     }
> > 
> >     off = ipbp[0];    /* offset within the mapped
> > space */
> >     len = ipbp[1];    /* len (in word count) */
> >     unuse_ipbuf(task, bid);
> > 
> >     CSL_init();//inicializa a tudo
> >     fd = MCBSP_open(MCBSP_DEV1,
> > MCBSP_OPEN_RESET);//ok
> >     MCBSP_reset(fd);
> >     MCBSP_config(fd,&configuracao);
> >     IRQ_clear(IRQ_EVT_INT1);
> >         IRQ_configArgs(IRQ_EVT_INT1, write_isr, 0,
> > 0, 0);
> >         IRQ_enable(IRQ_EVT_INT1);   /* enable
> MCBSP1
> > transmit ready
> > interrupt */
> >     MCBSP_start(fd, MCBSP_RCV_START |
> > MCBSP_XMIT_START | MCBSP_SRGR_START |
> > MCBSP_SRGR_FRAMESYNC, 0x0010);
> > 
> >     MCBSP_write16(fd,79);
> >     busywait(2000000L);
> > 
> 
=== message truncated ===


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