No output from SPI

beng_ — Tue, 28 Mar 2017 14:10:57 GMT

I'm using Kinetis K10 device with CodeWarrior with Processor Expert. The Processor expert code isn't producing an output on the SPI. So I'm trying to manually get it to work. My init and write functions are below, and via the register view in CodeWarrior I can see all the correct data is being written to the registers, but when I look at the SPI lines on a scope, they're doing nothing (i.e. CLK isn't even moving!)

The exact part I'm using is MK10DX32VLF5, I'm running in SPI master mode my SPI lines are:

Port D 0 - SPI0_PCS0 - Chip Select
Port D 1 - SPI0_SCK - SPI Clock
Port D 2 - SPI0_SOUT - Data Out
Port D 3 - SPI0_SIN - Data In (Not used and currently not connected)

As there's not output at all - I can't work out what I've missed out (I'm assuming it's something I've done wrong or omitted).

void main(void)

{

SPI_Init();

while (1)

{

delay_ms(500);

SPI_Write16(0xBE);

}

void SPI_Init(void)
{
PORTD_PCR0 = PORT_PCR_MUX(2); // Port D0 is SPI Chip Select
PORTD_PCR1 = PORT_PCR_MUX(2); // Port D1 is SPI Clock
PORTD_PCR2 = PORT_PCR_MUX(2); // Port D2 is SPI Data Out
PORTD_PCR3 = PORT_PCR_MUX(2); // Port D3 is SPI Data In

SIM_SCGC6 |= SIM_SCGC6_SPI0_MASK;

SPI0_MCR = SPI_MCR_MSTR_MASK |
             SPI_MCR_DCONF(0x00) |
             SPI_MCR_PCSIS(1) |
             SPI_MCR_CLR_TXF_MASK |
             SPI_MCR_CLR_RXF_MASK |
             SPI_MCR_SMPL_PT(2) |
             SPI_MCR_HALT_MASK;

SPI0_CTAR0 = SPI_CTAR_FMSZ(15) |
               SPI_CTAR_PCSSCK(2) |
               SPI_CTAR_PASC(2) |
               SPI_CTAR_PDT(2) |
               SPI_CTAR_PBR(2) |
               SPI_CTAR_CSSCK(2) |
               SPI_CTAR_ASC(2) |
               SPI_CTAR_DT(2) |
               SPI_CTAR_BR(2);

SPI0_SR = SPI_SR_TCF_MASK |
             SPI_SR_EOQF_MASK |
             SPI_SR_TFUF_MASK |
             SPI_SR_TFFF_MASK |
             SPI_SR_RFOF_MASK |
             SPI_SR_RFDF_MASK |
             SPI_SR_TXCTR(0x00) |
             SPI_SR_TXNXTPTR(0x00) |
             SPI_SR_RXCTR(0x00) |
             SPI_SR_POPNXTPTR(0x00) |
             0x00200000U;
}

uint8_t SPI_Write16(uint16_t data)
{
SPI0_SR = SPI_SR_TCF_MASK |
               SPI_SR_EOQF_MASK |
               SPI_SR_TFUF_MASK |
               SPI_SR_TFFF_MASK |
               SPI_SR_RFOF_MASK |
               SPI_SR_RFDF_MASK |
               SPI_SR_TXCTR(0x00) |
               SPI_SR_TXNXTPTR(0x00) |
               SPI_SR_RXCTR(0x00) |
               SPI_SR_POPNXTPTR(0x00) |
               0x00200000U;

SPI0_PUSHR = SPI_PUSHR_CTAS(0) |
               SPI_PUSHR_EOQ_MASK |
               SPI_PUSHR_CTCNT_MASK |
               SPI_PUSHR_PCS(1 ) |
               data;

// Start Transfer
SPI0_MCR &= ~(SPI_MCR_HALT_MASK);

#warning no check timeout set
while ( (SPI0_SR & SPI_MCR_HALT_MASK) == 0);

return (1);
}

Re: No output from SPI

Robin_Shen — Fri, 31 Mar 2017 09:14:14 GMT

Hi Ben,

Have you try to test the Typical Usage "Block reception/transmission, with interrupt service " of SPIMaster_LDD.
Test it on FRDM-K20D50M board, I was able to observe the SPI waveform on oscilloscope.

Best Regards,

Robin

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