SPI 3 wires

r58737 — Thu, 22 Jan 2015 14:45:22 GMT

Hello ,

Is it possible to get SPI 3 wires driver on the Freedom K46.

I Look at the documentation and only see information about the 4 wires spec.

I already implemented the 4 wires and look at the 3 wires possibility( in 3 wires the MOSI line is bidirectionnal and during reading the data is put on the MOSI line).

My actual SPI 4 wires readings :

byte SpiReadReg2(uint8_t addr) {

MySPIPtr = SM1_Init(NULL);

SPI0_BR=0x22;

dataforspi.spi_addr = addr+128;

dataforspi.spi_val = 0XFF;

SPI_CS2_ClrVal();

// send and receive of address and value

(void)SM1_ReceiveBlock(MySPIPtr, &dataforspi, sizeof(spiData));

(void)SM1_SendBlock(MySPIPtr, &dataforspi, sizeof(spiData));

// wait for receiving of the block of data

while(!SM1_GetBlockReceivedStatus(SM1_DeviceData)){};

SPI_CS2_SetVal();

return dataforspi.spi_val;

}

Thanks.

Re: SPI 3 wires

Hui_Ma — Fri, 23 Jan 2015 08:40:29 GMT

Hi,

Unfortunately, there is no KL46 SPI bidirectional mode driver code.

Please check below validation code for KL25 SPI mode, which test SPI communication using SPI bidirectional mode within SPI0 and SPI1 modules.

Wish it helps.

==========================================================================================================

void spi0_bid_master_spi1_bid_slave(void)

{

global_pass_count = 0;

enable_m0irq(10);

enable_m0irq(11);

PORTD_PCR6 &= ~PORTD_PCR6_MUX_MASK;

PORTD_PCR6 |= PORTD_PCR6_MUX(1)|PORTD_PCR6_DSE_MASK; //Use PTB15 as test result

GPIOD_PDDR |= 0x0040; //Pin is configured for general purpose output

GPIOD_PDOR &= 0xffffffbf; //PTB15 Output 0

PORTD_PCR3 &= ~PORTD_PCR3_MUX_MASK;

PORTD_PCR3 |= PORTD_PCR3_MUX(1)|PORTD_PCR3_DSE_MASK; //Use PTB15 as test result

GPIOD_PDDR |= 0x00008; //Pin is configured for general purpose output

GPIOD_PDOR &= 0xfffffff7;

// PORTB_PCR15 = PORT_PCR_MUX(1)|PORT_PCR_DSE_MASK; //Use PTB15 as test result

// GPIOB_PDDR |= 0x8000; //Pin is configured for general purpose output

// GPIOB_PDOR &= 0xffff7fff; //PTB15 Output 0

// PORTB_PCR16 = PORT_PCR_MUX(1)|PORT_PCR_DSE_MASK; //Use PTB16 as test result

// GPIOB_PDDR |= 0x10000; //Pin is configured for general purpose output

// GPIOB_PDOR &= 0xfffeffff;

//printf("SPI bidirection function test master model\n");

SPI0_C1 |= SPI0_C1_MSTR_MASK;

SPI0_BR = 0x43; //SPPR = 4, SPR = 3, bps div = (SPPR+1)*2^(SPR+1) = 80,----Tspi--6.4us

//SPI0_BR = 0x30;//bps div = (SPPR+1)*2^(SPR+1) = 8--------0.64us

SPI0_C1 |= SPI0_C1_SSOE_MASK|SPI0_C1_CPHA_MASK|SPI0_C1_CPOL_MASK|SPI0_C1_LSBFE_MASK;

SPI0_C1 &= (~SPI0_C1_SPIE_MASK); //Disable RX interrrupt

//SPI0_C1 |= SPI1C1_SPIE_MASK; //enable RX interrrupt

SPI0_C1 &= (~SPI0_C1_SPTIE_MASK); //Disable the transmit interrupt

//SPI0_C1 |= SPIC1_SPTIE_MASK; //Enable the transime interrupt

SPI0_C2 |= SPI0_C2_MODFEN_MASK|SPI0_C2_SPMIE_MASK;;

SPI0_C1 |= SPI0_C1_SPE_MASK;

SPI0_M = 0x56;

//set single wire mode

SPI0_C2 |= SPI0_C2_SPC0_MASK;

//Cash: Only MOSI can be used in BID mode, set MOSI input/output

SPI0_C2 |= SPI0_C2_BIDIROE_MASK; //MOSI is used in master as I/O

SPI1_C1 &= (~SPI1_C1_MSTR_MASK);

//SPI0_BR = 0x43; //SPPR = 4, SPR = 3, bps div = (SPPR+1)*2^(SPR+1) = 80,----Tspi--6.4us

//SPI0_BR = 0x30;//bps div = (SPPR+1)*2^(SPR+1) = 8--------0.64us

SPI1_C1 |= SPI1_C1_SSOE_MASK|SPI1_C1_CPHA_MASK|SPI1_C1_CPOL_MASK|SPI1_C1_LSBFE_MASK;

SPI1_C1 &= (~SPI1_C1_SPIE_MASK); //Disable RX interrrupt

//SPI0_C1 |= SPI1C1_SPIE_MASK; //enable RX interrrupt

SPI1_C1 &= (~SPI1_C1_SPTIE_MASK); //Disable the transmit interrupt

//SPI0_C1 |= SPIC1_SPTIE_MASK; //Enable the transime interrupt

SPI1_C2 |= SPI1_C2_MODFEN_MASK|SPI1_C2_SPMIE_MASK;

SPI1_C1 |= SPI1_C1_SPE_MASK;

SPI1_M = 0x5E;

//set single wire mode

SPI1_C2 |= SPI1_C2_SPC0_MASK;

//set MISO input

SPI1_C2 &= ~SPI1_C2_BIDIROE_MASK; //MISO is used in slave mode as input

spi0_send8(0x0E);

rd = spi0_get8(); //Cash: as in the bid I/O mode, the send and the read data should be the same~

rd1 = spi1_get8();

printf("SPI0_rd: %02x\r\n", rd&0xFF);

printf("SPI1_rd: %02x\r\n", rd1&0xFF);

spi0_send8(0x1E);

rd = spi0_get8(); //the send and the read data should be the same~

rd1 = spi1_get8();

printf("SPI0_rd: %02x\r\n", rd&0xFF);

printf("SPI1_rd: %02x\r\n", rd1&0xFF);

spi0_send8(0x2E);

rd = spi0_get8(); //the send and the read data should be the same~

rd1 = spi1_get8();

printf("SPI0_rd: %02x\r\n", rd&0xFF);

printf("SPI1_rd: %02x\r\n", rd1&0xFF);

spi0_send8(0x3E);

rd = spi0_get8(); //the send and the read data should be the same~

rd1 = spi1_get8();

printf("SPI0_rd: %02x\r\n", rd&0xFF);

printf("SPI1_rd: %02x\r\n", rd1&0xFF);

spi0_send8(0x4E);

rd = spi0_get8(); //the send and the read data should be the same~

rd1 = spi1_get8();

printf("SPI0_rd: %02x\r\n", rd&0xFF);

printf("SPI1_rd: %02x\r\n", rd1&0xFF);

spi0_send8(0x5E);

rd = spi0_get8(); //the send and the read data should be the same~

rd1 = spi1_get8();

printf("SPI0_rd: %02x\r\n", rd&0xFF);

printf("SPI1_rd: %02x\r\n", rd1&0xFF);

// while( global_pass_count <= 5 ){

// rd = spi1_get8();

// global_pass_count++;

// }

global_pass_count = 0;

SPI1_C2 |= SPI0_C2_BIDIROE_MASK; //MISO is used in slave mode as I/O---output

//set MOSI input

SPI0_C2 &= ~SPI0_C2_BIDIROE_MASK; //MOSI is used in master mode as input

while(1)

{

global_pass_count++;

while ((SPI1_S & SPI1_S_SPTEF_MASK) == 0);

SPI1_D = global_pass_count; //0111_1000----MSBF

rd=spi0_send_read(0xFF); //0011_0101----MSBF

printf("SPI0_rd: %02x\r\n", rd&0xFF);

//spi1_send8(global_pass_count);

//spi0_send8(0x5E); //there should no waveforms on MOSI----

//rd = spi0_get8(); //MOSI used as input, the rd data must be zero~~

//printf("Transaction complete!!\n\n");

/* we can set the MOSI to 0xff, to test the input function after make sure no waveform out */

}

==========================================================================================================

Have a great day,
best regards,

Ma Hui

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

topic SPI 3 wires in Kinetis Microcontrollers

SPI 3 wires

Re: SPI 3 wires