topic Re: MPC5775K SPI in MPC5xxx

MPC5775K SPI

ronliu — Mon, 28 Mar 2016 03:32:06 GMT

Hi,

I'm working with MPC5775K now. Is there any code sample about SPI module configuration to share?

Thanks.

Regards,

Ron

Re: MPC5775K SPI

martin_kovar — Thu, 31 Mar 2016 11:05:33 GMT

Hi Ron,

I ported example from AN4830 for MPC5775K and I added some interrupts after modules receive the message.

If you have any question, please feel free to write me back.

Regards,

Martin

Re: MPC5775K SPI

ronliu — Fri, 01 Apr 2016 11:28:16 GMT

Thanks. But how can I get the AN4832? Could you tell me the URL?

Re: MPC5775K SPI

martin_kovar — Fri, 01 Apr 2016 11:41:47 GMT

Hi,

do you mean AN4830?

http://cache.nxp.com/files/microcontrollers/doc/app_note/AN4830.pdf?fsrch=1&sr=1&pageNum=1

Regards,

Martin

Re: MPC5775K SPI

ronliu — Sat, 02 Apr 2016 08:17:58 GMT

Thanks,

I see that the file of AN4830 is about mpc574g. Is it similar with the mpc5775k?

Re: MPC5775K SPI

ronliu — Thu, 07 Apr 2016 09:38:37 GMT

I tested your code sample . It seemed that the CS signal didn't work. It was always high. b55689

Re: MPC5775K SPI

martin_kovar — Thu, 07 Apr 2016 11:05:33 GMT

Hi,

I have just tested and I see CS signal pulse on the oscilloscope. Pulse is about 25us long. Do you measure it on correct pin?

Regards,

Martin

Re: MPC5775K SPI

ronliu — Thu, 07 Apr 2016 12:50:41 GMT

Hi Martin

I was using DSPI2 to complete my project. The code was configured like that below.

I tested all four signals in a scope. I could see that SCK and SOUT were working in the right way.

But the CS0 was always high. Now , I configured CS0 pin into GPIO mode so that it could generate the right signal. You know it was a stupid method. But I want it to work automatically.

SIUL2.MSCR[10].R = 0x308C0001; //DSPI2_CS0
SIUL2.IMCR[10].B.SSS = 2;

// SIUL2.MSCR[10].R = 0x32000000;
// SIUL2.GPDO[10].B.PDO = 1;

SIUL2.MSCR[11].R = 0x308C0001; //DSPI2_SCK
SIUL2.IMCR[8].B.SSS = 2;
SIUL2.MSCR[12].R = 0x32840001; //DSPI2_SOUT
SIUL2.MSCR[13].R = 0x308C0000; //DSPI2_SIN
SIUL2.IMCR[9].B.SSS = 2;

SPI_2.MCR.R = 0x80030001;/*Configured Master mode */
SPI_2.MODE.CTAR[0].R = 0x78021004;/*Same CTAR0 configuration as SPI_0*/

SPI_2.MODE.CTAR[0].B.FMSZ = 7;
/* f = 4.15M ， 66.5 / (2 x 8) */
SPI_2.MODE.CTAR[0].B.DBR = 0;
SPI_2.MODE.CTAR[0].B.PBR = 0;
SPI_2.MODE.CTAR[0].B.BR = 3;

SPI_2.RSER.B.RFDF_RE = 1;/*Receive FIFO Drain Request enable*/
SPI_2.MCR.B.HALT = 0x0;/* Exit HALT mode: go from STOPPED to RUNNING state*/

/* interrupt */
//INTC.PSR[281].R = 0x8001; /*Set Core and interrupt priority*/
// INTC.PSR[281].B.PRC_SELN0 = 1;
// INTC.PSR[281].B.PRIN = 14;

Re: MPC5775K SPI

martin_kovar — Thu, 07 Apr 2016 13:18:44 GMT

Hi,

I see you configured SPI_2 as a master. So SPI_0 has to be slave. Are you able to receive data from master to slave and from slave to master? If yes, the signal has to be OK.

Try to measure signal directly in my project. There is definitely no problem with signals.

Regards,

Martin

Re: MPC5775K SPI

ronliu — Fri, 08 Apr 2016 01:42:08 GMT

Hi,

I want both SPI0 and SPI2 to work in the master mode. These two SPI buses are driving different device. I see that there are some difference between SPI0 and SPI2.

SIUL2.MSCR[36].R = 0x32840001; //DSPI0_CS0

SIUL2.MSCR[10].R = 0x308C0001; //DSPI2_CS0

SIUL2.IMCR[10].B.SSS = 2;

Re: MPC5775K SPI

martin_kovar — Fri, 08 Apr 2016 06:34:34 GMT

Hi,

now I understand the problem. In my example DSPI_2 CS0 is configured as input, because it is slave. You have to configure CS0 as output.

SIUL2.MSCR[10].R = 0x32840001;

And now it will work correct.

Regards,

Martin

Re: MPC5775K SPI

ronliu — Fri, 08 Apr 2016 09:40:20 GMT

Hi,

It seems that it doesn't work properly. Only the CS0 was abnormal. My code consists of two parts.

Re: MPC5775K SPI

martin_kovar — Fri, 08 Apr 2016 10:46:06 GMT

Hi,

I do not understand your last post. In your case, when both modules are configured as a master, the signal has to be configured with following direction for both modules:

SIN - input

SOUT - output

SCK - output

CS0 - output

Correct configuration for SPI_0 is:

SIUL2.MSCR[36].R = 0x32840001; //DSPI0_CS0

SIUL2.MSCR[37].R = 0x32840001; //DSPI0_SCK

SIUL2.MSCR[38].R = 0x32840001; //DSPI0_SOUT

SIUL2.MSCR[39].R = 0x308C0000; //DSPI0_SIN

Correct configuration for SPI_2 is:

SIUL2.MSCR[10].R = 0x32840001; //DSPI2_CS0

SIUL2.MSCR[11].R = 0x32840001; //DSPI2_SCK

SIUL2.MSCR[12].R = 0x32840001; //DSPI2_SOUT

SIUL2.MSCR[13].R = 0x308C0000; //DSPI2_SIN

Regards,

Martin

Re: MPC5775K SPI

sandeepnagaraja — Mon, 19 Dec 2016 09:21:13 GMT

Hi Martin,

Your code is really helpful, but i find it difficult to find a datasheet for MPC5775k , Could you please share the link for MPC5775k datasheet.

Re: MPC5775K SPI

sandeepnagaraja — Mon, 19 Dec 2016 09:25:23 GMT

We have a datasheet and reference manual for mpc5777m, my query is that, the registers like MCR, CTAR,MSCR are similar or different from each other, if both are same, then i could follow the mpc5777m for register bit mapping.

Re: MPC5775K SPI

martin_kovar — Mon, 19 Dec 2016 09:47:38 GMT

Hi,

MPC5775K reference manual revision 5 is not under NDA now, so I am attaching it to this post.

Regards,

Martin

Re: MPC5775K SPI

sandeepnagaraja — Mon, 19 Dec 2016 10:11:12 GMT

Great, Thanks for the quick reply Martin.

Re: MPC5775K SPI

sandeepnagaraja — Mon, 19 Dec 2016 10:18:24 GMT

As we are designing a SPI driver for MPC5777m based on your code for MPC5775k, The control registers bit mapping could be resolved with the reference manual u just shared, if i am not stressing up, could you kindly shar I/O signal table for MPC5775k, i am just checking for DSPI_0 and DSPI_1 specific pins for GPIO_INIT function.

Re: MPC5775K SPI

sandeepnagaraja — Tue, 20 Dec 2016 08:58:03 GMT

Hi Guys,

We are porting from MPC5748G to MPC5777M,We have procurred MPC57XX motherboard and a MPC5777M_512DS daughter board, i referred the reference manual and a datasheet, but we couldnt trace the SPI Specific pins(SCK,SOUT,SIN,SS(bar)) in the evaluation board, Could any one point out the SPI pins in the MPC57XX evaluation board.

Re: MPC5775K SPI

martin_kovar — Tue, 20 Dec 2016 12:05:12 GMT

Hi,

please look at the I/O signal description sheet. I do not know, why this excel file is not attached to newest reference manual placed on website.

Regards,

Martin