RM42L432: Failing to write 0xFF and 0x00 values to FEE with enabled Checksum in RM42L432

Hi there,

Context:

I have been struggling with a problem for a few days now. I am writing an application for RM42L432 based on FreeRTOS. The base libraries were generated using Halcogen.

The application needs to store permanent configuration values and I am using the Flash EEPROM Emulation for that purpose.

The FEE driver is configured to use 16 blocks of 8 bytes. See the attached ti_fee_cfg.h/c files below.

Problem:

I am trying to run the following sequence:

Std_ReturnType o_result=E_OK;
uint16 eeprom_status;

TI_Fee_Init();
do
{
    TI_Fee_MainFunction();
    eeprom_status=TI_Fee_GetStatus(0);
}
while(eeprom_status!= IDLE);

uint8_t data_zero[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
TI_Fee_WriteSync(1, data_zero, 8);
uint8_t data_one[8] = {0x00, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
TI_Fee_WriteSync(1, data_one, 8);

uint8_t dread[8];
o_result=TI_Fee_Read(1,0,dread,8);
do
{
    TI_Fee_MainFunction();
    delay();
    eeprom_status=TI_Fee_GetStatus(0);
}
while(eeprom_status!=IDLE);

I was expecting to get dread = {0x00, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}

However, I am getting dread = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}

Investigated so far:

1 - Memory state after write(data_one)
I monitor the values in memory and I come to the conclusion that the second write-array operation is not being performed. This is the memory state (monitored in Code Composer's memory browser) right after the execution of write(data_one):

If I am not mistaken, I can see clearly the data_zero being written to a block, but I don't see data_one being written at all.

2 - Memory state after write(data_one) modified

If I replace the values in data_one by, say:

I get the correct result and at the end of the code execution looks like this:

That made me think that the problem is in the value being written.

3 - Disabling Checksum

I came across the application report SPNA139 and I thought that the issue could be related to the checksum calculation. So, I disabled the checksum in ti_fee_cfg.h by setting

Files:

1830.ti_fee_cfg.c

0647.ti_fee_cfg.h