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[MKW01Z128] SPI communication - Master

Question asked by Erik Kokalj on Sep 1, 2017
Latest reply on Sep 7, 2017 by Gerardo Rodríguez

Hello everyone,


first off, I'm new to this website and programming. I have a problem with SPI communication on MKW01Z128. I will try to give you as much details as possible.


I am using IAR ide. I took KSDK example from MRB KW01 chip since it was the closest name to my chip. My chip will be the master of this communication. I configured SPI pins(in fuction void configure_spi_pins(uint32_t instance)) in pin_mux correctly:

PORT_HAL_SetMuxMode(PORTE,0u,kPortMuxAlt2); /* MISO */
PORT_HAL_SetMuxMode(PORTE,1u,kPortMuxAlt2); /* MOSI */
PORT_HAL_SetMuxMode(PORTD,5u,kPortMuxAlt2); /* SCK */
PORT_HAL_SetMuxMode(PORTD,4u,kPortMuxAlt2); /* PCS0 */

for pin 27, 29, 32, 34 as SPI1 PCS, SPI1 clock, SPI1 MISO, SPI1 MOSI on my chip.


Everything works fine, except a wierd short clock pulse(in yellow- MOSI is dark blue and MISO is light blue) everytime I send a packet before the actual payload:

A closeup of this short pulse:

MOSI sends correct bits and clock works great except the pulse part.

Unfortunatelly this pulse messes up the slave so won't send his data back. Tested this SPI communication with some other chip and it worked fine.

I will paste my code for inicialization and sending packets as well, maybe that is the cause:

#define SPI_MASTER_INSTANCE BOARD_SPI_INSTANCE /*! User change define to choose SPI instance */
#define TRANSFER_BAUDRATE (1250000U) /*! Transfer baudrate - 500k */
#define MASTER_TRANSFER_TIMEOUT (100U) /*! Transfer timeout of master - 100ms */



uint32_t calculatedBaudRate;
spi_master_state_t spiMasterState;
spi_master_user_config_t userConfig =
.bitCount = kSpi8BitMode,
.polarity = kSpiClockPolarity_ActiveHigh,
.phase = kSpiClockPhase_SecondEdge,
.direction = kSpiMsbFirst,
//CLOCK_SYS_EnablePortClock(PORTA_IDX); //doesn't matter
// dbg_uart_init();
// Init OSA layer.
// Init and setup baudrate for the master
SPI_DRV_MasterInit(SPI_MASTER_INSTANCE, &spiMasterState);

and sending packets:

if (SPI_DRV_MasterTransferBlocking(SPI_MASTER_INSTANCE, NULL, SendBuffer, s_spiSinkBufferS, 5, MASTER_TRANSFER_TIMEOUT) == kStatus_SPI_Timeout){}

I also tried normal(non-blocking) sending of packets, but clock still does this pulse.


If anyone has any questions or information about it I would appreaciate the comment.


Thank you in advance, Erik