K60 NXP SPI problem

[mdrasool_yadwad]

Hello Sir,

I attached document please check it once. In SPI0 the document of tower board is showing chip select 4 as Output. What does it mean we cant able to write or read 

[kerryzhou]

Hi  mdrasool_yadwad,

   SPI CS pin output is to the master, it is used to select the slave chip in the SPI modules.

   So, you just can consider one SPI0 has several CS pins, CS4 is just one external slave SPI chip select pins.

Wish it helps you!

If you still have questions about it, please kindly let me know!

Best Regards,

Kerry

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[mdrasool_yadwad]

I am enable to read the correct data by using the SPI. Below is my code please check it once. I am getting garbage data 

/* SPI config

// disable SPI
spiDisable(SPI0);

// enabling master mode and disable tx and rx,and clear rx,tx
SPI_MCR_REG(SPI0) |= (SPI_MCR_MSTR_MASK | SPI_MCR_ROOE_MASK | SPI_MCR_DIS_RXF_MASK | SPI_MCR_DIS_TXF_MASK | SPI_MCR_CLR_TXF_MASK | (SPI_MCR_CLR_RXF_MASK) );
SPI_MCR_REG(SPI0) |= SPI_MCR_PCSIS(1U); //-->Peripheral Chip Select is Inactive Low

// End of SpiEnableREeceiver
SPI_MCR_REG(spi) |= (1U<<SPI_MCR_ROOE_SHIFT);

// Frame size 8Bit **frame is equal to the FMSZ field value plus 1.
SPI_CTAR_REG(SPI0,0) = SPI_CTAR_FMSZ(7);

// set baudrate different frequency like 500khz
SPI_CTAR_REG(SPI0,0) |= SPI_CTAR_PBR(1U);//prescalar-3
SPI_CTAR_REG(SPI0,0) |= SPI_CTAR_BR(4U);//baud SCALAR factor-32
SPI_CTAR_REG(SPI0,0) |= (0U << SPI_CTAR_DBR_SHIFT);//value set to 0

// clock phase,polarity 0,msb first then 0 (LSBFE)
SPI_CTAR_REG(SPI0,0) &= ~(SPI_CTAR_CPHA_MASK | SPI_CTAR_CPOL_MASK | SPI_CTAR_LSBFE_MASK);

// Delay After Transfer Scaler ,ASC-ACK delay scalar,CSSCK-SCK delay,PCSSCK-PCS to SCK Delay Prescaler,PASC-After SCK Delay Prescaler,PDT-Delay after Transfer Prescaler
SPI_CTAR_REG(SPI0,0) |= (SPI_CTAR_DT(5U) | SPI_CTAR_ASC(5U) | SPI_CTAR_CSSCK(5U) | SPI_CTAR_PCSSCK(0U) | SPI_CTAR_PASC(0U) | SPI_CTAR_PDT(0U));
SPI_PUSHR_REG(SPI0) =SPI_PUSHR_PCS(1<<4);
spiEnable(SPI0);

*/End

/* SPI Write

void DAC_AD5724(int data)
{
 SPI_Start(); 

uint8_t i=0;
i=data;


SPI0_PUSHR = SPI_PUSHR_CONT_MASK|SPI_PUSHR_CTAS(0x01)|(SPI_PUSHR_PCS(1<<4))|SPI_PUSHR_TXDATA(0x02);

SPI0_PUSHR =SPI_PUSHR_TXDATA(i);

while(!(SPI0_SR & SPI_SR_TCF_MASK ));
SPI0_SR |= SPI_SR_TCF_MASK;

 SPI0_PUSHR |= SPI_PUSHR_TXDATA(data>>8);
 while(!(SPI0_SR & SPI_SR_TCF_MASK ));
 SPI0_SR |= SPI_SR_TCF_MASK;
 
 SPI0_PUSHR|=SPI_PUSHR_TXDATA(data);
 while(!(SPI0_SR & SPI_SR_TCF_MASK ));
 SPI0_SR |= SPI_SR_TCF_MASK;
 
 
 SPI_Stop();

*/Write End

/*SPI Read

SPI_Start(); // Reading the data from the 23lcv1024

SPI0_PUSHR=SPI_PUSHR_PCS(1<<4)|SPI_PUSHR_CTAS(0x01)|SPI_PUSHR_TXDATA(0x03);
SPI0_PUSHR|=SPI_PUSHR_TXDATA(0x03);
while(!(SPI0_SR & SPI_SR_TCF_MASK ));
SPI0_SR |= SPI_SR_TCF_MASK;

SPI0_PUSHR |= SPI_PUSHR_TXDATA(0x00);
while(!(SPI0_SR & SPI_SR_TCF_MASK ));
SPI0_SR |= SPI_SR_TCF_MASK;


SPI0_PUSHR|= SPI_PUSHR_TXDATA(0x00);

while(!(SPI0_SR & SPI_SR_TCF_MASK ));
SPI0_SR |= SPI_SR_TCF_MASK;

SPI0_PUSHR |= SPI_PUSHR_TXDATA(0x10);
while(!(SPI0_SR & SPI_SR_TCF_MASK ));
SPI0_SR |= SPI_SR_TCF_MASK;

a = SPI0_POPR;

SPI_Stop();

*/READ End

[nxf56274]

Hi,

A suggestion is that do not use the default pin for pcs. You can use any pin configured as gpio to make the pin as cs. Here is the reason. When start transfer, the cs will be low automatically. Then you send one byte, the cs will be high automatically. But sometimes the master should send continuous several bytes. In this time, the cs should hold low. Due to you can't control the cs, your communication will fail. Another suggestion is that use sdk. The attachment is a project reading w25q. It uses gpio to control cs. You can use refer this. 

Have a great day,
TIC

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[mdrasool_yadwad]

You mean to say we cant control CS using registers.

[nxf56274]

Hi,

Using gpio is more convenient and flexible.

Have a great day,
TIC

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[mdrasool_yadwad]

Thanks for your response.

One more doubt I am using SPI available on port C whether I have to use CS of same port or any of the gpio can be configures as CS to operate the SPI

[nxf56274]

Hi,

Any gpio is ok. gpio is not controlled by spi. You can refer the attachment I sent to you.

Have a great day,
TIC

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[mdrasool_yadwad]

Like wise in your attachment you have used SPI0 of port D (93,94,95,96 pins), 93-CS you made as normal GPIO of same port D. 

This is my doubt whether i have to use the same port CS as gpio or any of the pin as GPIO and use as CS.

When i use any of pin as GPIO and CS i m not getting the correct data

[nxf56274]

Hi,

This means your code may have some problems. You have to use oscilloscope to check the spi timing. 

Have a great day,
TIC

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[mdrasool_yadwad]

I have checked that also but data is not proper.