topic Re: LPC2368 FLASH as RAM in LPC Microcontrollers

LPC2368 FLASH as RAM

pazdimpazdim — Sun, 24 Jun 2018 08:37:07 GMT

Hello. I am reviewing the controller LPC2368. It has 512 kb flash ram and 32 kb ram (too few). Can I use flash memory as a ram? How slowly does it work?

Re: LPC2368 FLASH as RAM

bernhardfink — Mon, 25 Jun 2018 08:15:38 GMT

Flash can be read like a RAM from the ARM core, but cannot be written like a RAM.

If you need more RAM, then you should consider an MCU with more RAM. Or alternatively use external RAM (requires MCU with external memory bus).

Regards,

Bernhard.

Re: LPC2368 FLASH as RAM

pazdimpazdim — Mon, 25 Jun 2018 14:39:35 GMT

Thanks for the answer. How to write to RAM during program execution? Any serial interface?

Re: LPC2368 FLASH as RAM

bernhardfink — Mon, 25 Jun 2018 15:56:31 GMT

SRAM or SDRAM which is connected to the memory bus is simply a memory mapped area, like the internal RAM.

So no need for any serialization.

Re: LPC2368 FLASH as RAM

pazdimpazdim — Mon, 25 Jun 2018 17:45:51 GMT

"Flash can be read like a RAM from the ARM core, but cannot be written like a RAM."

How is the writing performed in this case?

...

Sorry, my bad. How to write to FLASH during program execution? SPI, I2C, UART?

Re: LPC2368 FLASH as RAM

bernhardfink — Mon, 02 Jul 2018 11:59:05 GMT

Look into the specification of the respective flash device:

Internal flash: data sheet & user's manual of the LPC2368 (look for "In Application Programming", IAP)
External flash: data sheet of the parallel flash or serial SPI flash