MQX SPI Drivers w/DMA usage on MQX version 4.0.2 with K60

[M_Grillo]

Hello,

Are there any issues with MQX 4.0.2 with the TWR-K60D100M when using SPI2 DMA drivers? Based on the MQX examples I can successfully see data write, (SOUT  <PTB22>), while doing a full duplex " ioctl (spifd, IO_IOCTL_SPI_READ_WRITE, &rw)". But RXFIFOs nor the memory location pointed to see the data on SIN, (PTB23).

Here are some of the lines of code I'm using in my project:

*******************************************************************************

/* Configure PINs */

                  PORTB_PCR20 = (0|PORT_PCR_MUX(2));                           // Alt2 //CS

                  PORTB_PCR21 = (0|PORT_PCR_MUX(2));                           // Alt2 //CLK

                  PORTB_PCR22 = (0|PORT_PCR_MUX(2));                           // Alt2 //SOUT

                  PORTB_PCR23 = (0|PORT_PCR_MUX(2)|PORT_PCR_IRQC(3));                // Alt2 //SIN //DMA both edges ?

/* Open the SPI driver */

    spifd = fopen (TEST_CHANNEL, NULL);  // #define TEST_CHANNEL  "spi2:"

//baud, clock mode, endian, transfer mode are from the MQX example.

    /* Test simultaneous write and read */

    memset (send_buffer, 0, sizeof (send_buffer));

    memset (recv_buffer, 0, sizeof (recv_buffer));

    send_buffer[0] = SPI_MEMORY_READ_DATA;

    for (i = SPI_MEMORY_ADDRESS_BYTES; i != 0; i--)

    {

send_buffer[i] = (SPI_MEMORY_ADDR1 >> ((SPI_MEMORY_ADDRESS_BYTES - i) << 3)) & 0xFF;

    }

rw.BUFFER_LENGTH = 10;

    rw.WRITE_BUFFER = (char_ptr)send_buffer;

    rw.READ_BUFFER = (char_ptr)recv_buffer;

eips_user_dbprint0("IO_IOCTL_SPI_READ_WRITE ... ");

    if (SPI_OK == ioctl (spifd, IO_IOCTL_SPI_READ_WRITE, &rw))

    {

eips_user_dbprint0("OK\n\r");

    }

    else

    {

eips_user_dbprint0("ERROR\n\r");

    }

    fflush (spifd);

***************************************************************************

I can see data from "rw.WRITE_BUFFER" on the wire and it matches.

I removed my slave dice for test purposes and looped back SOUT to SIN and still see nothing but all 0's in buffer rw.READ_BUFFER and SPI2_RXFRx registers. Is the data still stuck in the shift register?

With a break point after the ioctl above SPI register values are:

SPI2_MCR = 0x81fe0000

SPI2_TCR = 0x00fr40000

SPI2_SR = 0xc2000000

SPI2_RSER = 0x03030000

SPI2_POPR = 0x00

SPI2_RXFR0 to 3 = 0x00

Any ideas why RX FIFOs are not seeing any data in?

Thanks,

Mark

[M_Grillo · Accepted solution]

MQX was overiding my port PCR settings. Modify init_gpio.c \ _bsp_dspi_io_init   :  (See below) //* Configure GPIOB for DSPI2 peripheral function	*

         pctl = (PORT_MemMapPtr)PORTB_BASE_PTR;

	pctl->PCR[20] = PORT_PCR_MUX(2);	//* DSPI2.PCS0   *
	pctl->PCR[21] = PORT_PCR_MUX(2);	//* DSPI2.SCK	*
	pctl->PCR[22] = PORT_PCR_MUX(2);	//* DSPI2.SOUT   *
	pctl->PCR[23] = PORT_PCR_MUX(2);	//* DSPI2.SIN	*
	pctl = (PORT_MemMapPtr)PORTD_BASE_PTR; //Port D for CS1
	pctl->PCR[15] = PORT_PCR_MUX(2);	//* DSPI2.PCS1   *

	//* Enable clock gate to DSPI2 module *
	sim->SCGC3 |= SIM_SCGC3_SPI2_MASK;

Mark

[soledad]

Hi Mark,

Please check the below threads and let me know if this helps,

Using MQX on a Kinetis K60 how do I change the SPI chip select?

Can somebody point me to exact changes to SPI (MQX) driver from 3.8.1 to 4.1.1 ?

MQX SPI Working

Have a great day,
Sol

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[M_Grillo]

Hello Sol,

Thanks for the response.

Just so I understand this correctly; Do Not use MQX( 4.x.x) - DMA with SPI2 drivers on older devices including the K60DN512?

I'm not having any problems with CS. The SPI2_RXFRx FIFOs are not receiving data.

Thanks,

Mark