topic Re: ksdk spi slave erroneous data - out of sync in Kinetis Software Development Kit

ksdk spi slave erroneous data - out of sync

mjg8t — Wed, 20 Jan 2016 23:33:14 GMT

I am having issues with received slave spi data on the k22f using KSDK 1.3 and processor expert. I have simplified the project using 2 frdm-k22f boards one as master and one as slave. The master send 8 bytes of data 1-8 and I check on the slave to see that it received it.

The recieve data is not correct and sometime is will miss a byte being sent. It misses 0d05 consistently. When 5 is missed the rx does not know that the frame has finished and recieves the first part of the next frame. It seems to be a timing issue, but I checked the phase,polarties and even slowed the master clock to a snails pace of 130Khz.

I have looked at the data on the scope and the tx data is fine. See attachment to see the 0d05 value being sent (but no received on the slave).

I looked at the slave registers and the only thing that looks funny is that the SR.TFUF. Though the sdk api sends a successful return.

I have simplified the project to 8 bytes from 16 where the more bytes are missed and things get worse.

Any ideas what is wrong?

#define SPI_BLOCKING 1 #define SPIS_BUF_SIZE 8   //volatile uint8_t spisTxBuf[SPIS_BUF_SIZE] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }; //tx on MISO volatile uint8_t spisTxBuf[SPIS_BUF_SIZE] = { 0, 1, 2, 3, 4, 5, 6, 7 }; //tx on MISO volatile uint8_t spisRxBuf[SPIS_BUF_SIZE] = { 0 }; //received from MOSI dspi_status_t result;

#ifdef SPI_BLOCKING   result = DSPI_DRV_SlaveTransferBlocking(SPI1_IDX, // number of SPI peripheral   spisTxBuf, // pointer to transmit buffer, can be NULL   spisRxBuf, // pointer to receive buffer, can be NULL   SPIS_BUF_SIZE, // size of receive and receive data   1000); // Time out after 1000ms   if (result != kStatus_DSPI_Success) {   __asm("NOP");   } #else     //non-blocking   result = DSPI_DRV_SlaveTransfer(SPI1_IDX,// number of SPI peripheral   spisTxBuf,// pointer to transmit buffer, can be NULL   spisRxBuf,// pointer to receive buffer, can be NULL   SPIS_BUF_SIZE// size of receive and receive data   );     // Wait for transfer completion   while(kStatus_DSPI_Success != DSPI_DRV_SlaveGetTransferStatus(SPI1_IDX, NULL)); #endif     __asm("NOP"); //breakpoint to inpect data   clearRxArray();     }

ksdk 1.3

kds 3

Original Attachment has been moved to: DEBUG_K22F_SPI_SLAVE.zip

Original Attachment has been moved to: DEBUG_K22F_SPI_MASTER.zip

Re: ksdk spi slave erroneous data - out of sync

Alice_Yang — Fri, 22 Jan 2016 09:15:47 GMT

Hello Michael,

Have you test the SPI demo under KSDK1.3 on your board ?

KSDK_1.3.0\examples\frdmk22f\driver_examples\dspi

Whether it can work well ?

Alice

Re: ksdk spi slave erroneous data - out of sync

mjg8t — Fri, 22 Jan 2016 15:52:17 GMT

Hi Alice,

I was able to get the sdk 1.3 non-blocking example code working.

The example code had to be modified to get it work with SPI1. in hardware_init() function where the where it is hard coded for spi0 "configure_spi_pins(0);)" and should be a variable based upon the selected instance in main. Second in order to get SPI1 to work I had to enable the clock for portd "CLOCK_SYS_EnablePortClock(PORTD_IDX);".

So it appears that there is a problem with the processor expert generated code.

Re: ksdk spi slave erroneous data - out of sync

Alice_Yang — Mon, 25 Jan 2016 11:36:41 GMT

Hello Michael,

Please connect the GND( the J2 pin 14 ) from one board to another board , then have a try.

If it still can not work , i will create one new project about SPI on KDS-PE tomorrow , and today

i don't know where is wrong , when i run your project on my side , the slave can received nothing.

Alice

Re: ksdk spi slave erroneous data - out of sync

mjg8t — Mon, 25 Jan 2016 15:58:14 GMT

Hi Alice,

Thank you for the reply. I have had gnd connected from board to board in all tests.

I have been able to reproduce the same problem with the sdk example projects master/slave non-blocking at a high enough frequency of baud rate. In order to use the drivers on my custom board I was not BOARD_ClockInit();, but was running of the default internal osc. This was slow enough to cause the sdk drivers to fail at a baud rate of 1Mhz with the SDK drivers. It appears I will have to use the pll to increase the internal clock to get the performance I need.

Re: ksdk spi slave erroneous data - out of sync

Alice_Yang — Wed, 27 Jan 2016 03:08:56 GMT

Hello Michael,

Today , i test your project on my side again , it can work well use the default clock rate .

And i also configure it to 1M , it can work well also .

Hope it helps

Have a great day,
Alice Yang

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