MK60 SPI master doesn't receive

ednasalazar — Mon, 26 Jan 2015 13:35:07 GMT

Hi,

I have a problem with my SPI.

After analysing spi transaction using keil ulink pro debugger and I saw that information sent by SPI slave is not detected.

This is SPI configuration:

void SPI_Init(void) {

/*------------------------------------------------------------------------------

port SPI configuration

*------------------------------------------------------------------------------*/

SIM->SCGC5 |= SIM_SCGC5_PORTD_MASK; /* enable clock for PORTB */

SIM->SCGC3 |= SIM_SCGC3_SPI2_MASK; /* enable clock for SPI2 */

// Assign SPI signals to the port pins

PORTD->PCR[11] &= PORT_PCR_MUX_MASK;

PORTD->PCR[11] |= PORT_PCR_MUX(2) ; // SPI2 CS

PORTD->PCR[12] &= PORT_PCR_MUX_MASK;

PORTD->PCR[12] |= PORT_PCR_MUX(2) ; // SPI2 SCLK

PORTD->PCR[13] &= PORT_PCR_MUX_MASK;

PORTD->PCR[13] |= PORT_PCR_MUX(2) ; // SPI2 MOSI

PORTD->PCR[14] &= PORT_PCR_MUX_MASK;

PORTD->PCR[14] |= PORT_PCR_MUX(2) ; // SPI2 MISO

/*------------------------------------------------------------------------------

SPI register configuration (MCR Register, CTAR Register, SR Register)

*------------------------------------------------------------------------------*/

// Configuration

SPI2->MCR = SPI_MCR_HALT_MASK; // halt SPI before SPI setting psSPI->MCR = SPI_MCR_HALT_MASK

SPI2->MCR &= ~SPI_MCR_MDIS_MASK; // enable module

SPI2->MCR |= SPI_MCR_MSTR_MASK; // master mode enabled

SPI2->MCR |= SPI_MCR_PCSIS(1) // inactive state of CS signal is high

| SPI_MCR_DCONF(0)

| SPI_MCR_DIS_TXF_MASK // disable TX FIFO

| SPI_MCR_DIS_RXF_MASK; // Disable RX FIFO

SPI2->MCR |= SPI_MCR_ROOE_MASK;

// Setting the SPI protocol in order to match requirements of motor driver

SPI2->CTAR[0] = SPI_CTAR_PCSSCK(2) // PCS to SCK Delay Prescaler = 3

| SPI_CTAR_CSSCK(3) // PCS to SCK Delay Scaler = 4

| SPI_CTAR_PBR(1) // Baud Rate Prescaler = 2

| SPI_CTAR_PASC(3) // After SCK Delay Prescaler = 5

| SPI_CTAR_DT(2) // Delay After Transfer Scaler

| SPI_CTAR_BR(4) // Baud Rate Scaler = 512

| SPI_CTAR_ASC(3) // After SCK Delay Scaler

| SPI_CTAR_CPHA_MASK

| SPI_CTAR_PDT(1) // Delay after Transfer Prescaler = 7

| SPI_CTAR_CPOL_MASK // clock polarity - inactive state of SCK is high

| SPI_CTAR_FMSZ(7) ; // 9-bit transfer block

SPI2->SR = SPI_SR_TCF_MASK // clear transfert complet flag

| SPI_SR_EOQF_MASK // clear end of queue flag

| SPI_SR_TFUF_MASK // clear transmit FIFO Fill Flag

| SPI_SR_TFFF_MASK // clear transfert complet flag

| SPI_SR_RFOF_MASK // clear receive FIFO Overflow Flag

|SPI_SR_RFDF_MASK; // clear receive FIFO Drain Flag

SPI2->RSER = (uint32_t)0x00UL; // clear DMA interruptions

SPI2->MCR &= ~SPI_MCR_HALT_MASK; // starts DSPI transfers

}

/*************************************************************************

* Function Name: SPI_Send

* Parameters: sending command

* Return: received status data

* Description: SPI send data handler uint8_t

*************************************************************************/

void Send_SPI (SPI_Type *psSPI, uint8_t SPI_data) {

psSPI->PUSHR = SPI_PUSHR_TXDATA(SPI_data) | SPI_PUSHR_PCS(1) ;

while (!((psSPI->SR >> SPI_SR_TCF_SHIFT) & 1)){}; //wait till transmission completes

psSPI->SR |= SPI_SR_TCF_MASK; // clear complete flag

} /* vSPI_Send */

uint8_t Receive_SPI (SPI_Type *psSPI) {

while (!(psSPI->SR & SPI_SR_RFDF_MASK));

return (psSPI->POPR);

} /* uchSPI_Receive */

This is my main.c :

#include "MK60N512MD100.h"

#include "spi.h"

/*----------------------------------------------------------------------------

MAIN function

*----------------------------------------------------------------------------*/

int main (void) {

uint8_t x,y;

SPI_Init();

while(1) {

Send_SPI(SPI2,0xD0);

x=Receive_SPI(SPI2);

Send_SPI(SPI2,0x00);

x=Receive_SPI(SPI2);

Send_SPI(SPI2,0x00);

y=Receive_SPI(SPI2);

}

When I see SR register of SPI2, I realize that the flag RFDF is clear when the folloging part is executed:

psSPI->SR |= SPI_SR_TCF_MASK;

Thanks very much

Re: MK60 SPI master doesn't receive

jeremyzhou — Tue, 27 Jan 2015 08:45:24 GMT

Hi enna salazar,

I'd like to highly recommend that you should get to understand the communication protocol of the slave device totally through review its datasheet.

I've attached a demo of TWR-K60D100 board about SPI communicate with external flash chips AT26DF081A and I think it help you to establish the connection between the Master and Slave correctly.
Have a great day,
Ping

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: MK60 SPI master doesn't receive

ednasalazar — Fri, 30 Jan 2015 08:56:27 GMT

Thanks

Kinetis MicrocontrollersのトピックMK60 SPI master doesn't receive

MK60 SPI master doesn't receive

Re: MK60 SPI master doesn't receive

Re: MK60 SPI master doesn't receive