TPS929120-Q1: EEPROM Programming Issue

I think the answer to your problem is as follows: 

Do you calculate the CRC from the lowest EEPROM address to the highest EEPROM address? if so, then don't. You need to calculate it the other way around. 

Here's a code you can run in any online compiler. The reversed print is the correct CRC calculated. You can change the "data" array with the register's values in the corresponding order.

Let me know if this solves your issue!

#include <stdio.h>
typedef unsigned char    uint8;

#define CRC_ARRAY_SIZE                                      (256)

const uint8 crc_array[CRC_ARRAY_SIZE] = 
{0,94,188,226,97,63,221,131,194,156,126,32,163,253,31,65,157,195,33,
127,252,162,64,30,95,1,227,189,62,96,130,220,35,125,159,193,66,28,
254,160,225,191,93,3,128,222,60,98,190,224,2,92,223,129,99,61,124,
34,192,158,29,67,161,255,70,24,250,164,39,121,155,197,132,218,56,
102,229,187,89,7,219,133,103,57,186,228,6,88,25,71,165,251,120,38,
196,154,101,59,217,135,4,90,184,230,167,249,27,69,198,152,122,36,
248,166,68,26,153,199,37,123,58,100,134,216,91,5,231,185,140,210,
48,110,237,179,81,15,78,16,242,172,47,113,147,205,17,79,173,243,
112,46,204,146,211,141,111,49,178,236,14,80,175,241,19,77,206,144,
114,44,109,51,209,143,12,82,176,238,50,108,142,208,83,13,239,177,
240,174,76,18,145,207,45,115,202,148,118,40,171,245,23,73,8,86,180,
234,105,55,213,139,87,9,235,181,54,104,138,212,149,203,41,119,244,170,
72,22,233,183,85,11,136,214,52,106,43,117,151,201,74,20,246,168,116,
42,200,150,21,75,169,247,182,232,10,84,215,137,107,53};

static uint8 CRCH_CalculateCrc(uint8* data_ptr, uint8 length);

int main()
{
    uint8 temp = 0;
    uint8 counter = 0;
    uint8 data[39] = {0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,0x00,0xFF,0x0F,
    0xFF,0x0F,0x00,0x07,0x03,0x00,0x00,0x00,0x00,0x00,0x00};
    uint8 reverse[39];
    
    for(counter=0; counter<39; counter++)
    {
        reverse[counter] = data[39-counter];
    }
    
    temp = CRCH_CalculateCrc(data, 39);
    
    printf("%d\n", temp);
    
    temp = CRCH_CalculateCrc(reverse, 39);
    printf("%d\n", temp);

    return 0;
}


uint8 CRCH_CalculateCrc(uint8* data_ptr, uint8 length)
{
    uint8 counter = 0;
    uint8 remainder = 0xFF;
    uint8 tempdata = 0;

    for(counter=0; counter<length; counter++)
    {
        /*input data byte XOR remainder*/
        tempdata = remainder^data_ptr[counter];
        /*use tempData as the index to retrieve its CRC from crcArray*/
        remainder = crc_array[tempdata];
    }
    /*Reverse the final remainder to get the CRC value*/
    remainder = 
    ((remainder & 0x80)>>7) + ((remainder & 0x40) >>5) + 
    ((remainder & 0x20) >>3) + ((remainder & 0x10)>>1) + 
    ((remainder & 0x08)<<1) + ((remainder & 0x04) <<3) + 
    ((remainder & 0x02) <<5) + ((remainder & 0x01)<<7);
    
    return remainder;
}

Hi Lance,

As you describe, you are using internal address in multiple devices E2PROM setting and program a 'standard' configuration into multiple, i want to check the process of EEPROM progress

1)Do you use pull-up ref pin to select the device you want to program? And do you comply with the process of pull-up ref programming sequence ?

2)Whether all device are on and  also on the UART bus when you program?

3)As you describe "I run the code, power cycle the chip, read out CALC_EEPCRC and update EEPM15 to be equivalent to CALC_EEPCRC, then re-write the entire EEPROM with the updated value.  " Do you check the value is the value you want to write and whether the crc is same as the calculate tool.

4) i also recommend you to set EEPM12-EEPM14 to 00 when you program EEPROM, you can try again and tell me the result,