On Mon, 30 Mar 2015 15:56:06 +0000 Riccardo Delpopolo Carciopolo rdelpopolo@gmail.com wrote:
Hi, I've used flashrom with pickit2 in past. I'm a newbie but I'd like to add support for this MCUs by myself. On Internet exist some parallel programmer but I want to program a 78k0s flash my with the uart protocol. We're can I start from? It requires some vpp pulses to enable the uart programming mode.
I don't think that flashrom is the right tool for the job of writing the flash memory of a microcontroller. Usually there are dedicated tools for this... but I guess the 78k0s are not really popular? You can of course use flashrom or at least its serial.c as a base for your tool.
The protocol seems to be documented in a public application note: http://documentation.renesas.com/doc/DocumentServer/U17739EJ3V0AN00.pdf
I am not sure about pulses thing. AFAICT the flash mode is enabled if FLMD0 is high when reset is released. I am however unsure if the following pulses on the same pin (FLMD0) are to be output by the programmer or are a way for the chip to indicate how it needs to be accessed... the language in the AN is abysmal. I would apply VCC to FLMD0 on reset release with a pull-up resistor and measure if the chip outputs anything on the port...
Anyway this is rather off-topic... good luck with your project!
Thank you for answering.
Regards
Il giorno ven 3 apr 2015 17:39 Stefan Tauner < stefan.tauner@alumni.tuwien.ac.at> ha scritto:
On Mon, 30 Mar 2015 15:56:06 +0000 Riccardo Delpopolo Carciopolo rdelpopolo@gmail.com wrote:
Hi, I've used flashrom with pickit2 in past. I'm a newbie but I'd like to add support for this MCUs by myself. On Internet exist some parallel programmer but I want to program a 78k0s flash my with the uart protocol. We're can I start from? It requires some vpp pulses to enable the uart programming mode.
I don't think that flashrom is the right tool for the job of writing the flash memory of a microcontroller. Usually there are dedicated tools for this... but I guess the 78k0s are not really popular? You can of course use flashrom or at least its serial.c as a base for your tool.
The protocol seems to be documented in a public application note: http://documentation.renesas.com/doc/DocumentServer/U17739EJ3V0AN00.pdf
I am not sure about pulses thing. AFAICT the flash mode is enabled if FLMD0 is high when reset is released. I am however unsure if the following pulses on the same pin (FLMD0) are to be output by the programmer or are a way for the chip to indicate how it needs to be accessed... the language in the AN is abysmal. I would apply VCC to FLMD0 on reset release with a pull-up resistor and measure if the chip outputs anything on the port...
Anyway this is rather off-topic... good luck with your project!
Kind regards/Mit freundlichen Grüßen, Stefan Tauner
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Riccardo Delpopolo Carciopolo -
Stefan Tauner