topic Re: Checking SPI Transmit and receive in KEA-128 using TRK-KEA128 in Kinetis Microcontrollers

Checking SPI Transmit and receive in KEA-128 using TRK-KEA128

vigneshbalaji — Fri, 23 Dec 2016 12:54:22 GMT

Hi,

I am checking SPI Transmit and receive using 2 KEA-128 Development Board.I am using one TRK-KEA128 board for transmit and another TRK-KEA-128 Board for receive. I am not able to get it right. I have attached the code for both SPI Transmit and receive Below.

I am using Port E for both connections are

Master Slave

PTE0 -> PTE0 (SPI_SCK -> SPI_SCK)

PTE1 -> PTE2 (MOSI -> MISO)

PTE3 -> PTE3 (SS -> SS)

I have made only these connections, is it enough or do i need to do more connections?

I am not able to receive any data.I am seeing it on debug mode in spi_d global variable for the receive code to validate this.

Can you tell me what things I have to change to make SPI Transmit and receive work???

Original Attachment has been moved to: SPI_Master_Transmit.zip

Original Attachment has been moved to: SPI_slave_KEA_128.zip

Re: Checking SPI Transmit and receive in KEA-128 using TRK-KEA128

kerryzhou — Mon, 26 Dec 2016 05:32:35 GMT

Hi VIGNESH BALAJI,

1. About the sample code

Please refer to your another post, I already give you the SPI sample code:

SPI slave KEA-128

Please refer to the official code, and check your own code.

2. SPI connection

Your connection is wrong.

Master slave

MISO MISO

MOSI MOSI

SS SS

CLK CLK

You can't connect the MOSI in master to slave MISO, you should connect MOSI in master to the MOSI in slave.

This is very important.

Wish it helps you!

Have a great day,
Kerry

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Re: Checking SPI Transmit and receive in KEA-128 using TRK-KEA128

vigneshbalaji — Tue, 27 Dec 2016 08:13:48 GMT

Hi Kerry,

I understood the connections, what I wanted to know here is Whether the code that I have attached for SPI_Transmit and SPI_receive are they right????

Can you cross check them and say me ????

Re: Checking SPI Transmit and receive in KEA-128 using TRK-KEA128

kerryzhou — Thu, 29 Dec 2016 06:49:27 GMT

Hi VIGNESH BALAJI,

Your code have some errors.

Master:

1. select the SSEL as the SPI select pin instead of just GPIO.

SPI0_C1 |= SPI_C1_SSOE_MASK;
SPI0_C2 |= SPI_C2_MODFEN_MASK;

2. enable the PTE0, PTE1,PTE2,PTE3 pull up for working stable.

PORT_PUE1 |= PORT_PUE1_PTEPE0_MASK | PORT_PUE1_PTEPE1_MASK|PORT_PUE1_PTEPE2_MASK|PORT_PUE1_PTEPE3_MASK;

3. After enter main file, add a small delay for the power on stable.

int main(void){
unsigned int i,j;
    Clk_Init();
   SPI_init();

   for(i=0;i<100;i++) for(j=0;j<65535;j++); // delay, wait for the system stable

   for(;;) {
        SPI_write(0x21);
        uint8_t spi_d = SPI_read();
   }

   return 0;
}

Slave:

1. select the SSEL as the SPI select pin instead of just GPIO.

SPI0_C1 &= ~SPI_C1_SSOE_MASK;
SPI0_C2 |= SPI_C2_MODFEN_MASK;

2. enable the PTE0, PTE1,PTE2,PTE3 pull up for working stable.

PORT_PUE1 |= PORT_PUE1_PTEPE0_MASK | PORT_PUE1_PTEPE1_MASK|PORT_PUE1_PTEPE2_MASK|PORT_PUE1_PTEPE3_MASK;

Then after connect two KEA128 together, it will work fine.

I have test your code on my TRK KEA128 board, it works ok.

Slave debug result:

Slave can receive the correct data 0x21 from master.

Logic analyzer wave:

I also attached my modified project for your reference.

Wish it helps you!

Have a great day,
Kerry