ECC calculation on the TMS470M

Phil Eagleton

Hi,

does anyone know if the Fapi_HardwareCalculateEcc function works on the TMS470M? I am using the API 1.06, which is the latest off the website.

I have run the function on 16 bytes, 4 32bit words, and the resultant ECC words returned appear to be the same, regardless of the data that I have programmed into the memory.

If the ecc function does not support the TMS470M processor, where can I find the algorithm so that I can create my own function to calculate the ECC?

thanks for the help, I am away for 2 weeks, so if I won't reply back until I return.

regards,

Phil

over 14 years ago

0 Zhaohong Zhang over 14 years ago

TI__Mastermind 22715 points

Phil,

Would you please send your test code for us to take a look?

Thanks and regards,

Zhaohong

0 Phil Eagleton over 13 years ago in reply to Zhaohong Zhang

Intellectual 335 points

Hi, very much a work in progress, but the code below will show the settings I am using for the ECC.

uint16_t hal_flash_write( flash_sp_memory_t mem, uint32_t address, uint32_t count, uint8_t* buffer )
{
/* for ecc test */
uint16_t ecc[16] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };

uint16_t result = ERRORCODE_DSP_FLASH_FAIL;
bool_t write_result = FALSE;
bool_t verify_result = FALSE;
FAPI_ERROR_CODE ecc_result = FALSE;
FLASH_STATUS_ST the_status;

FLASH_ARRAY_ST control = (FLASH_ARRAY_ST)0xfff87000;
the_status.stat1 = 0x00000000;
the_status.stat2 = 0x00000000;
the_status.stat3 = 0x00000000;
the_status.stat4 = 0x00000000;

/* write the data */
write_result = Flash_Prog_Data_B( (uint32_t * )(address),
(uint32_t*)buffer,
count / 4,
0,
delay,
control,
&the_status,
count / 4,
CMND_PROG_DATA_MAIN
);

ecc_result = Fapi_HardwareCalculateEcc( (uint32_t * )(address),
&ecc[0],
count/4,
control

);

if ( write_result == TRUE )
{
/* program the ecc bits. */

/* verify that the data is correct */
verify_result = Flash_Verify_Data_B((uint32_t * )(address),
(uint32_t*)buffer,
count / 4,
0,
control,
&the_status,
count / 4
);
}

if ( write_result == TRUE )
{
result = ERRORCODE_NO_ERROR;
}

return (result);
}

0 Zhaohong Zhang over 13 years ago in reply to Phil Eagleton

TI__Mastermind 22715 points

Phil,

Sorry for the late reply.

The Fapi_HardwareCalculateEcc() function in the current library does not work for TMS470M series. I would like to recommend the following method to calculate ECC using TMS470 Flash wrapper. The following code sequence returns one byte ECC for a 64 bit data.

#define FEMU_ECC_Reg *(unsigned char *)0xfff87063
#define FEMU_ADDR_Reg *(unsigned int *)0xfff87068
#define FEMU_DMSW_Reg *(unsigned int *)0xfff87058
#define FEMU_DLSW_Reg *(unsigned int *)0xfff8705c

unsigned char ECC;

    FEMU_ADDR_Reg = FlashAddr;   // write flash address to program. Must be 64 bit aligned
   FEMU_DLSW_Reg = FWM_Data[i<<1]; // write lower 32 bit data
   FEMU_DMSW_Reg = FWM_Data[(i<<1)+1]; //write upper 32 bit data
   ECC = FEMU_ECC_Reg; //read ECC

Please let know if this solves your problem.

Thanks and regards,

Zhaohong

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ECC calculation on the TMS470M