topic LPC54102 SPI0 & SPI1 Communication issue? in LPC Microcontrollers

LPC54102 SPI0 & SPI1 Communication issue?

ratheesht — Fri, 24 Mar 2017 09:16:02 GMT

Hi,

I have LPCXpresso 54102 LQFP64 Rev A (OM13077) development board & using LPCXpresso_8.1.0_597 IDE.

It is running with Cortex M4 processor at 96MHz.

I am executing the default example program "periph_spi_sm_int" to validate SPI protocol with master and slave.

I have connected spi0 & spi1 with wire in connector J3 & J1 like below

     SPI0 SSEL to SPI1 SSEL
     SPI0 CLK to SPI1 CLK
     SPI0 MISO to SPI1 MOSI
     SPI0 MOSI to SPI1 MISO

SPI communication is working with error(return error C). The below show the o/p which is received in UART terminal

SLAVE [txDoneCount = 16, rxDoneCount = 15]
MASTER [txDoneCount = 16, rxDoneCount = 16]

TRANSFER COMPLETE: errors = c
Master total transfer time = 16953uS
Showing data from : Master TX data
            0x0001 0x0002 0x0003 0x0004 0x0005 0x0006 0x0007 0x0008
            0x0009 0x000a 0x000b 0x000c 0x000d 0x000e 0x000f 0x0010
Showing data from : Master RX data
            0xfffe 0xfffe 0xfffd 0xfffc 0xfffb 0xfffa 0xfff9 0xfff8
            0xfff7 0xfff6 0xfff5 0xfff4 0xfff3 0xfff2 0xfff1 0xfff0
Showing data from : Slave TX data
            0xfffe 0xfffd 0xfffc 0xfffb 0xfffa 0xfff9 0xfff8 0xfff7
            0xfff6 0xfff5 0xfff4 0xfff3 0xfff2 0xfff1 0xfff0 0xffef
Showing data from : Slave RX data
            0x0001 0x0003 0x0004 0x0005 0x0006 0x0007 0x0008 0x0009
            0x000a 0x000b 0x000c 0x000d 0x000e 0x000f 0x0010 0x0000

1. On Master RX data , 0XFFFE received two times & last byte is not received (0xffef)

2. On Slave RX data , 0x0002 is missed , received only 15 bytes i.e. why last bytes as 0x0000

I am running default example only, and didn't modified anything regarding SPI.

What will be the problem ?

Can you suggest your ideas to solve this ?

Re: LPC54102 SPI0 & SPI1 Communication issue?

ratheesht — Mon, 27 Mar 2017 03:22:50 GMT

Hi ,

In the above, SPI is running with 4Mhz frequency.

Re: LPC54102 SPI0 & SPI1 Communication issue?

jeremyzhou — Tue, 28 Mar 2017 06:10:28 GMT

Hi Ratheesh T,

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.

The BRIDGE_SCK pin of the J3 is assigned to the P1_3 (Fig 1). However the SPI0_SCK is assigned to the P0_11 in the periph_spi_sm_int demo.

So I think it's the root cause of your issue.

Fig 1

Have a great day,
Ping

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Re: LPC54102 SPI0 & SPI1 Communication issue?

ratheesht — Tue, 28 Mar 2017 10:41:56 GMT

Hi ,

Thanks for your reply.

I have tried with two options like below but issue is not solved

1.Chip_IOCON_PinMuxSet(LPC_IOCON, 1, 3, (IOCON_FUNC5 | IOCON_MODE_PULLUP | IOCON_DIGITAL_EN));

2.Chip_IOCON_PinMuxSet(LPC_IOCON, 1, 3, (IOCON_FUNC5 | IOCON_DIGITAL_EN));

It gives the same error result.

Have any other suggestion?

Re: LPC54102 SPI0 & SPI1 Communication issue?

ratheesht — Mon, 08 May 2017 06:58:51 GMT

Hi,

Now the SPI communication is working with some restriction

i.e.

Restriction 1 -- Frequency rate reduced from 4Mhz to 1Mhz

Restriction 2 -- After every transaction if i call the function setupMaster() then only it is working fine, otherwise it is giving wrong values. But for SPI communication this function( setupMaster() ) call is not required for every transmission of data because it is only needed at the time of initialization. So please suggest me your ideas whether it is required every time or not ?

The below function shows that implementation for your reference

void spi_tx_rx(uint8_t *tx_buffer,int32_t tx, uint8_t *rx_buffer, int32_t rx)
{
volatile uint8_t *mstate;

   spiMasterXfer.cbFunc   = master_cb;
   spiMasterXfer.state    = SPIS_XFER_STATE_IDLE;
   spiMasterXfer.txBuff    = tx_buffer;
   spiMasterXfer.txCount    = tx; ///sizeof(masterTXBuffer16);// / sizeof(uint16_t);/* Count is in transfer size */
   spiMasterXfer.rxBuff    = rx_buffer;
   spiMasterXfer.rxCount    = rx; //sizeof(masterRXBuffer16);// / sizeof(uint16_t);/* Count is in transfer size */
   mstate = &spiMasterXfer.state;

   /* Setup master transfer options - 8 data bits per transfer, EOT, EOF */
   spiMasterXfer.options = SPIM_XFER_OPTION_SIZE(8) |   SPIM_XFER_OPTION_EOT |   SPIM_XFER_OPTION_EOF |   0;
   Chip_SPI_FlushFifos(LPC_SPIMASTERPORT);

Chip_SPIM_XferBlocking(LPC_SPIMASTERPORT, &spiMasterXfer);

while ( (*mstate != SPIM_XFER_STATE_DONE)){}
setupMaster();
}

I am using the above function like below

                  SPI_CS_LOW();
                   spi_tx_rx(masterTXBuffer16,packet_size,masterRXBuffer16,packet_size) ;
                   SPI_CS_HIGH();

static void setupMaster()
{
SPI_CFGSETUP_T spiSetup;
SPIM_DELAY_CONFIG_T masterDelay;

/* Initialize SPI controller */
Chip_SPI_Init(LPC_SPIMASTERPORT);

   /* Call to initialize first SPI controller for mode0, master mode, MSB first */
   Chip_SPI_Enable(LPC_SPIMASTERPORT);
   spiSetup.master = 1;
   spiSetup.lsbFirst = 0;
   spiSetup.mode = SPI_CLOCK_MODE0;
   Chip_SPI_ConfigureSPI(LPC_SPIMASTERPORT, &spiSetup);

/* Setup master controller SSEL0 for active low select */
Chip_SPI_SetCSPolLow(LPC_SPIMASTERPORT, 0);

/* Setup master clock rate, slave clock doesn't need to be setup */
Chip_SPIM_SetClockRate(LPC_SPIMASTERPORT, SPI_CLOCKRATE);

   /* Setup master delay (all chip selects) */
   masterDelay.PreDelay = 0xD;
   masterDelay.PostDelay = 0xD;
   masterDelay.FrameDelay = 0xD;
   masterDelay.TransferDelay = 0xD;
   Chip_SPIM_DelayConfig(LPC_SPIMASTERPORT, &masterDelay);

   /* For the SPI controller configured in master mode, enable SPI master interrupts
       for interrupt service. Do not enable SPI_INTENSET_TXDYEN. */
#if 0
   Chip_SPI_EnableInts(LPC_SPIMASTERPORT, (SPI_INTENSET_RXDYEN |
                                           SPI_INTENSET_RXOVEN | SPI_INTENSET_TXUREN | SPI_INTENSET_SSAEN |
                                           SPI_INTENSET_SSDEN));
#endif
}

Please let me know if there's anything you'd like me to clarify

Re: LPC54102 SPI0 & SPI1 Communication issue?

ratheesht — Tue, 13 Jun 2017 12:19:29 GMT

Hi,

Any of you give suggestion regarding above