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
