LPC11C14 SPI communication

kangkangli — Thu, 09 Nov 2017 15:16:35 GMT

Hello everyone ,

i am currently working on a project where i have to use LPC11C14 to communicate with another measurement instrument through SPI. I have to send some commands and read data from the instrument every second. But i can't get any data from that, also i checked the SPI with oscilloscope there are no data coming out. The program i wrote is based on the example in the LPCOpen. Can someone check my code and give me some instruction here? I really tried to find problem but i get nothing. Here is the code.

#include "board.h"

#include <cr_section_macros.h>

/*****************************************************************************

* Private types/enumerations/variables

****************************************************************************

****************************************************************************/

// For SSP Communication

#define BUFFER_SIZE (0x10)

#define SSP_DATA_BITS (SSP_BITS_8)

#define SSP_DATA_BIT_NUM(databits) (databits + 1)

#define SSP_DATA_BYTES(databits) (((databits) > SSP_BITS_8) ? 2 : 1)

#define SSP_LO_BYTE_MSK(databits) ((SSP_DATA_BYTES(databits) > 1) ? 0xFF : (0xFF >> \

(8 - SSP_DATA_BIT_NUM(databits))))

#define SSP_HI_BYTE_MSK(databits) ((SSP_DATA_BYTES(databits) > 1) ? (0xFF >> \

(16 - SSP_DATA_BIT_NUM(databits))) : 0)

#define LPC_SSP LPC_SSP0

#define SSP_IRQ SSP0_IRQn

#define SSPIRQHANDLER SSP0_IRQHandler

/* Tx buffer */

static uint8_t Tx_Buf[24]; // RAM

/* Rx buffer */

static uint8_t Rx_Buf[8];

static SSP_ConfigFormat ssp_format;

static Chip_SSP_DATA_SETUP_T xf_setup;

static volatile uint8_t isXferCompleted = 0;

#define TICKRATE_HZ (1) /* 1 ticks per second */

/*****************************************************************************

* Public types/enumerations/variables

****************************************************************************/

/* Set pin mux for SSP operation */

static void Init_SSP_PinMux(void)

{

Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO0_8, (IOCON_FUNC1 | IOCON_MODE_INACT)); /* MISO0 */

Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO0_9, (IOCON_FUNC1 | IOCON_MODE_INACT)); /* MOSI0 */

Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO0_2, (IOCON_FUNC1 | IOCON_MODE_INACT)); /* SSEL0 */

Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO2_11, (IOCON_FUNC1 | IOCON_MODE_INACT)); /* SCK0 */

Chip_IOCON_PinLocSel(LPC_IOCON, IOCON_SCKLOC_PIO2_11);

}

/*****************************************************************************

* Private functions

****************************************************************************/

/* Initialize buffer */

static void Buffer_Init(void)

{

uint16_t i;

// send wake up signal

// wait for T_WAKE=100-300 us

//Configuration Commands

//use default configuration first

Tx_Buf[0]=0x80;

Tx_Buf[1]=0x01;

Tx_Buf[2]=0x4D;

Tx_Buf[3]=0x7A;

// write configuration register 0-5

Tx_Buf[4]=0xFC;

Tx_Buf[5]=0x00;

Tx_Buf[6]=0x00;

Tx_Buf[7]=0x00;

Tx_Buf[8]=0x00;

Tx_Buf[9]=0x00;

//send PEC

Tx_Buf[10]=0x4F;

Tx_Buf[11]=0x82;

// adc

Tx_Buf[12]=0x83;

Tx_Buf[13]=0x70;// CMD1 select all cells measurement DCP =1

Tx_Buf[14]=0xDF;//PEC

Tx_Buf[15]=0x56;

//polling

Tx_Buf[16]=0x87;

Tx_Buf[17]=0x14;

Tx_Buf[18]=0x83;

Tx_Buf[19]=0x78;

//GET ALL THE SUM OF ALL CELL MEASURMENT Read status register Group A

Tx_Buf[20]=0x80;

Tx_Buf[21]=0x10;

Tx_Buf[22]=0x9D;

Tx_Buf[23]=0x66;

// 6 bytes from status register Group A

for (i = 0; i < 8; i++) {

Rx_Buf[i] = 0xAA;

}

/*****************************************************************************

* Public functions

****************************************************************************/

/**

* @brief SSP interrupt handler sub-routine

* @return Nothing

void SSPIRQHANDLER(void)

{

Chip_SSP_Int_Disable(LPC_SSP); /* Disable all interrupt */

Chip_SSP_Int_RWFrames8Bits(LPC_SSP, &xf_setup);

if ((xf_setup.tx_cnt != xf_setup.length) || xf_setup.rx_cnt <8) { //|| (xf_setup.rx_cnt != xf_setup.length)

Chip_SSP_Int_Enable(LPC_SSP); /* enable all interrupts */

}

else {

isXferCompleted = 1;

}

/**

* @brief timer interrupt handler sub-routine

* @return Nothing

void TIMER32_0_IRQHandler(void)

{

if (Chip_TIMER_MatchPending(LPC_TIMER32_0, 1)) {

Chip_TIMER_ClearMatch(LPC_TIMER32_0, 1);

Chip_SSP_Enable(LPC_SSP); // enable SSP communication

Buffer_Init();

xf_setup.length = 24;

xf_setup.tx_data = Tx_Buf; // assign the address of the first number to the pointer

xf_setup.rx_data = Rx_Buf; // assign the address of the first number to the pointer

xf_setup.rx_cnt = 0;

xf_setup.tx_cnt = 0;

Chip_SSP_Int_FlushData(LPC_SSP);/* flush dummy data from SSP FiFO */

Chip_SSP_Int_RWFrames8Bits(LPC_SSP, &xf_setup);

Chip_SSP_Int_Enable(LPC_SSP); /* enable interrupt */

while (!isXferCompleted) {

}

isXferCompleted=0;

Chip_SSP_Disable(LPC_SSP);

}

int main(void){

/* =================this part is the main function part==============

* initialization */

SystemCoreClockUpdate();

Board_Init();

/* =================SSP initialization ============*/

Init_SSP_PinMux();

Chip_SSP_Init(LPC_SSP);

ssp_format.frameFormat = SSP_FRAMEFORMAT_SPI; // SPI Frame format

ssp_format.bits = SSP_DATA_BITS; // set 8 bits

ssp_format.clockMode = SSP_CLOCK_MODE3; // clock mode as CPHA=1, CPOL=1

Chip_SSP_SetFormat(LPC_SSP, ssp_format.bits, ssp_format.frameFormat, ssp_format.clockMode);

Chip_SSP_SetMaster(LPC_SSP, 1); // SET MCU as master

Chip_SSP_SetBitRate(LPC_SSP, 10000); //set bit rate here t_CLK>=1 us!

Chip_SSP_Enable(LPC_SSP); // enable SSP communication

NVIC_EnableIRQ(SSP_IRQ);

Buffer_Init();

xf_setup.length = 24;

xf_setup.tx_data = Tx_Buf; // assign the address of the first number to the pointer

xf_setup.rx_data = Rx_Buf; // assign the address of the first number to the pointer

xf_setup.rx_cnt = 0;

xf_setup.tx_cnt = 0;

/* Timer configuration*/

Chip_TIMER_Init(LPC_TIMER32_0);

uint32_t timerFreq = Chip_Clock_GetSystemClockRate();

Chip_TIMER_Reset(LPC_TIMER32_0);

Chip_TIMER_MatchEnableInt(LPC_TIMER32_0, 1);

Chip_TIMER_SetMatch(LPC_TIMER32_0, 1, (timerFreq / TICKRATE_HZ));

Chip_TIMER_ResetOnMatchEnable(LPC_TIMER32_0, 1);

Chip_TIMER_Enable(LPC_TIMER32_0);

// Enable timer interrupt

NVIC_ClearPendingIRQ(TIMER_32_0_IRQn);

NVIC_EnableIRQ(TIMER_32_0_IRQn);

while (1) {

__WFI();

}

return 0;

}

Re: LPC11C14 SPI communication

kerryzhou — Wed, 15 Nov 2017 08:11:03 GMT

Hi Kangkang,

You can test the official lpc11c24 lpcopen code on your side directly, change the MCU from LPC11C24 to LPC11C14.

https://www.nxp.com/downloads/en/software/lpcopen_v2_00a_lpcxpresso_nxp_lpcxpresso_11c24.zip

I have test the official ssp project, the SPI master works OK.

This is my SPI pin wave:

I didn't connect MISO, so the MISO data is invalid, but you can see the MOSI, it is correct.

Besides, you need to check the pin:

    Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO0_8, (IOCON_FUNC1 | IOCON_MODE_INACT));   /* MISO0 */
   Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO0_9, (IOCON_FUNC1 | IOCON_MODE_INACT));   /* MOSI0 */
   Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO0_2, (IOCON_FUNC1 | IOCON_MODE_INACT));   /* SSEL0 */
   Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO2_11, (IOCON_FUNC1 | IOCON_MODE_INACT));   /* SCK0 */

Please use the official code directly, after it works, then you can add your timer and test it again.

Wish it helps you!

Have a great day,
Kerry

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

LPC MicrocontrollersのトピックLPC11C14 SPI communication

LPC11C14 SPI communication

Re: LPC11C14 SPI communication