Error in SPI data transfer after changing the frame size

[anju1]

Hii,

I am currently working on frdm k64f board.. I am using MQX  4.2 with IAR..  I want to communicate with SPI in 9bit data transfer. The data transfer in frame size of 8 bit is ok. but when i change the frame size as

param = 9; /* Set framesize to 9*/
printf("Setting framesize to %d ", param);
if (SPI_OK == ioctl(spifd, IO_IOCTL_SPI_SET_FRAMESIZE, &param)) {
printf("OK\n");
} else {
printf("ERROR\n");
}

printf("Getting framesize ... "); /* Get transfer mode */
if (SPI_OK == ioctl(spifd, IO_IOCTL_SPI_GET_FRAMESIZE, &param)) {
printf("%d\n", param);
} else {
printf("ERROR\n");
}

the data transfer is not happening.. 

I have also tried changing the frame size in init_spi.c file , it was also unsuccessful.

anyone please help

[kerryzhou]

Hi ANJU ANTONY,

BTW, I highly recommend you test this SPI bit function without the MQX, just use the baremetal code.

You can test it based on the K64 sdk code.

If you still have question about it, I will check it on my FRDM-K64 board.

Have a great day,
Kerry

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[kerryzhou]

Hi ANJU ANTONY,

   Do you debug your code, and check the SPI register?

  SPIx_CTARn[FRMSZ]= 8 if you want to send 9 bit data.

 Please debug, and check the register directly.

  Maybe your register is not modified.

Wish it helps you!

If you still have question about it, please send me your debug result.

Have a great day,
Kerry

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[anju1]

Hi,

Thank you for your reply, 

I have debug my code,

The register value   SPI0_CTAR0 is 

SPI0_CTAR0_SPI0  0x40005506   ReadWrite
DBR                          0       ReadWrite
FMSZ                     0x8    ReadWrite
CPOL                    0      ReadWrite
CPHA                    0      ReadWrite
LSBFE                   0      ReadWrite
PCSSCK               0x0    ReadWrite
PASC                    0x0    ReadWrite
PDT                      0x0    ReadWrite
PBR                     0x0    ReadWrite
CSSCK                0x5     ReadWrite
ASC                     0x5     ReadWrite
DT                       0x0     ReadWrite
BR                       0x6     ReadWrite

so the frame size changes in the register.

Also the frame size changes when set to 7 bit.The problem is when setting above 8 bit value. 

[kerryzhou]

Hi ANJU ANTONY,

   Thank you for your updated information.

   Could you give me the SPI bus wave when you set the bit above 8 bit value, eg. 8 bit, 9bit. ect. Please also give me the 7 bit SPI bus wave, especially the SPI_CLK.

   Then I will help you to check it.

    When you test it, please also give me the debug result picture about the   SPIx_CTARn[FRMSZ].

Waiting for your updated information.
Have a great day,
Kerry

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