Store data and variables into flash

Jozef Šedo

Other Parts Discussed in Thread: TMS320F28335

Hi,

I have tms320f28335 microprocessor. Program is executed from flash memory, but data and variables are stored into RAM. I want to store data into flash memory.

When I modified F28335.cmd linker command file and rewrote line: ".ebss : > RAML4 PAGE = 1" to ".ebss :> FLASHB PAGE = 1". Then variables are in flash memory (I check their addresses), but they are not rewritable. How can I eliminate this problem?

Thanks for your answers.

Regards

Jozef

over 14 years ago

0 David Foley over 14 years ago

TI__Expert 8500 points

Jozef,

Flash cannot be written as a RAM variable. You have to program it. Furthermore, it is not erasable per word, but per sector. For data you need to use a EEPROM emulation strategy. See the following app note: http://focus.ti.com/lit/an/sprab69/sprab69.pdf .

Regards,
Dave Foley

0 Jozef Šedo over 14 years ago in reply to David Foley

Prodigy 200 points

Thank you, David.

I downloaded http://www-s.ti.com/sc/techlit/sprab69.zip . I used F28xx On-Chip Flash Programmer for load this example into flash. Erase, program and verify operations were successful. After that Code Composer reports: "Code Composer could not locate: Flash28_Delay.asm". I didn't find this file anywhere. Can you help me, please?

Regards

Jozef

0 David Foley over 14 years ago in reply to Jozef Šedo

TI__Expert 8500 points

Jozef,

This is the name of one of the source files in the Flash API, which TI doesn't release. CCS tries to associate a source file with the code running on the chip. Ignore the message.

Regards,
Dave Foley

C2000™︎ microcontrollers

C2000 microcontrollers forum

Store data and variables into flash