Arduino Uno and LTC6803-4 problem with communication using SPI

good day everyone!

i have problem our battery management system using ltc6803-4. used measure 5 series cells. problem when read configuration of ltc6803-4, receive 0 0 0 0 0 0, seems not communicating each other. doesn't match configuration have sent it. don't know what's problem code , schematic. here attach schematic , arduino code , output in serial monitor. , also, copied getpec code other source have checked , seems correct. if can double check me , point out if wrong code makes communication not working, pls need help. datasheet ltc6803-4 can found here http://cds.linear.com/docs/en/datasheet/680324fa.pdf

code: [select]

#include "spi.h"

#define wrcfg 0x01 // write configuration register
#define rdcfg 0x02 // read configuration register
#define rdcv 0x04 // read cell voltages
#define stcvad 0x10 // start adc poll status
// #define ltc6804addr1 0x80 // board address 1st ltc6803-4
#define ltc6804addr2 0x81 // board address 2nd ltc6803-4
#define total 5 // total connected cells

byte byteholder;
// configuration 1st module of ltc6803-4 (negate ltc6803-4)
//byte cffmvmc[6] = {0x09, 0x00, 0x00, 0x00, 0x00, 0x00};
// configuration 1st module assert ltc6803-4
byte asltc6803[6] = {0x29, 0x00, 0x00, 0xfc, 0xa4, 0xba};
byte ltc2[1] = {0x81};

byte wrfg[1] = {0x01};

void setup() {
 // put setup code here, run once:
 
 pinmode(10, output);
 pinmode(11, output);
 pinmode(12, input);
 pinmode(13, output);
 digitalwrite(10, high);
 spi.begin();
 spi.setclockdivider(spi_clock_div64);
 spi.setdatamode(spi_mode3);
 spi.setbitorder(msbfirst);
 serial.begin(9600);
 writecfgr();
}

void loop() {
 // put main code here, run repeatedly:
 readcfgrtencells();
//  spistart();
//  spi.transfer(getpec(wrfg,1));
//  spiend();
 delay(2000);
}

// calculate pec, n  size of din
byte getpec(byte * din, int n) {
byte pec, in0, in1, in2;
pec = 0x41;
for(int j=0; j<n; j++) {
  for(int i=0; i<8; i++) {
    in0 = ((din[j] >> (7 - i)) & 0x01) ^ ((pec >> 7) & 0x01);
    in1 = in0 ^ ((pec >> 0) & 0x01);
    in2 = in0 ^ ((pec >> 1) & 0x01);
    pec = in0 | (in1 << 1) | (in2 << 2) | ((pec << 1) & ~0x07);
  }
}
return pec;
}

void spistart() {
 spi.begin();
 if(digitalread(10) == low) {
   digitalwrite(10,high);
   delaymicroseconds(5); //ensure valid pulse
 }
 digitalwrite(10, low);
 //delaymicroseconds(20);
}

void spiend(uint8_t flag) { //wait poll status
 spi.end();
 if(flag > 0) {
   delaymicroseconds(10);
   digitalwrite(10, high);
 }
}

void spiend(void) {
 spiend(1);
}

// write configuration registers ltc6803-4 using broadcast write
void writecfgr(){
 serial.println("writing configuration cells..");
 // open spi communication
 spistart();
 // send wrcfg command , pec byte (2 bytes)
 spi.transfer(wrcfg);
 spi.transfer(0xc7);
 // send command cfgr0 cfgr5 (6 bytes)
 sendmultiplebytespi(asltc6803, 6);
 // send computed pec byte of cfgr0 cfgr5
//  spi.transfer(getpec(asltc6803,6));
 spi.transfer(0xf7);
 // close spi communication
 spiend();
}

//// read cell configuration registers ltc6803-4 using addressable read
void readcfgrtencells(){
 serial.println("reading configuration 5 cells..");
 // open spi communication
 spistart();
 // send address , pec byte (2 bytes)
 spi.transfer(ltc6804addr2);
 spi.transfer(getpec(ltc2,1));
 // send rdcfg command , pec byte (2 bytes)
 spi.transfer(rdcfg);
 spi.transfer(0xce);
 // gather read data configuration registers (6 bytes)
 for(int = 0; < 6; i++){
   byteholder = spi.transfer(rdcfg);
   serial.println(byteholder, hex);
   }
  
 // close spi communication
 spiend();
}

// send multiple data ltc
void sendmultiplebytespi(byte * data, int n){
 for (int = 0; i<n; i++){
   spi.transfer(data[i]);
   }
 }

that doesn't expected:

code: [select]

// send multiple data ltc
void sendmultiplebytespi(byte * data, int n){
  (int = 0; i<n; i++){
    spi.transfer(data);
    }
  }

to send data block have change code to:

code: [select]

// send multiple data ltc
void sendmultiplebytespi(byte * data, int n){
  (int = 0; i<n; i++){
    spi.transfer(data[i]);
    }
  }

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