Re: DIY Build ISP Questions [Build your own upgrader dongle!
Posted: 29 Oct 2014, 21:48
Hello,
I'm new here, registered simply because I'm looking for info on changing the firmware on an MSTAR-powered LCD control board. I'm not a TV guy, nor do I own one of the devices that this forum deals with. I'm simply looking for some more technical info on how the MSTAR firmware & flashing work, and I'm desperately hoping that perhaps someone here might be able to help me out...
Here's the deal:
I recently purchased the following LCD display + driver control board combo:
http://www.dx.com/p/diy-hd-5-tft-lcd-di ... CXHJBawT58
The board is powered by an MSTAR MST703-LF video chip. It's a simple LCD display (used for stuff like car headrest displays) that takes a standard composite video signal & outputs it to the LCD. It provides a very basic OSD, and there are no other video inputs (no HDMI, no VGA, none of that).
Anyway, I need to make changes to the firmware for that particular chip in order to change the output resolution and also disable the 'blue screen on no signal' effect (need it to show snow/static when there's no signal). Apparently, this is all stuff that can be changed in the firmware.
I have the datasheet for that chip, but have no clue about where to get more info on both getting & compiling the firmware source code or how to flash a compiled firmware image directly to the chip.
So, here's why I'm here...
Aside from the firmware source code issue, I'm hoping someone here can help me figure out how to flash the chip itself. The PCB exposes some header pins that connect directly to the SDA & SCL pins on the MSTAR chip (i2c bus connection). So, I can connect to the chip directly via these pins, but I'm not sure what type of hardware tool I should be using to communicate with it in order to flash the firmware image to it.
Apparently, you guys here need to build a custom dongle in order to access the i2c bus via the video (VGA?) connector. However, in my case, I've got a straight path to the chip's i2c bus.
So, does that mean that I can use something like an Arduino or FTDI adapter to communicate directly with it? And, if so, is there anything else that needs to be done, or do I simply point the flash tool at the correct com port & it automatically handles the rest?
also, does anyone know if the firmware tools that are out on the net will support this chip, the MST703-LF?
lastly, if anyone has anymore technical info on either the MSTAR protocol or on where I can get some example code or even a fully-functional source code base for an MSTAR firmware image, I'd really really appreciate it.
I'm new here, registered simply because I'm looking for info on changing the firmware on an MSTAR-powered LCD control board. I'm not a TV guy, nor do I own one of the devices that this forum deals with. I'm simply looking for some more technical info on how the MSTAR firmware & flashing work, and I'm desperately hoping that perhaps someone here might be able to help me out...
Here's the deal:
I recently purchased the following LCD display + driver control board combo:
http://www.dx.com/p/diy-hd-5-tft-lcd-di ... CXHJBawT58
The board is powered by an MSTAR MST703-LF video chip. It's a simple LCD display (used for stuff like car headrest displays) that takes a standard composite video signal & outputs it to the LCD. It provides a very basic OSD, and there are no other video inputs (no HDMI, no VGA, none of that).
Anyway, I need to make changes to the firmware for that particular chip in order to change the output resolution and also disable the 'blue screen on no signal' effect (need it to show snow/static when there's no signal). Apparently, this is all stuff that can be changed in the firmware.
I have the datasheet for that chip, but have no clue about where to get more info on both getting & compiling the firmware source code or how to flash a compiled firmware image directly to the chip.
So, here's why I'm here...
Aside from the firmware source code issue, I'm hoping someone here can help me figure out how to flash the chip itself. The PCB exposes some header pins that connect directly to the SDA & SCL pins on the MSTAR chip (i2c bus connection). So, I can connect to the chip directly via these pins, but I'm not sure what type of hardware tool I should be using to communicate with it in order to flash the firmware image to it.
Apparently, you guys here need to build a custom dongle in order to access the i2c bus via the video (VGA?) connector. However, in my case, I've got a straight path to the chip's i2c bus.
So, does that mean that I can use something like an Arduino or FTDI adapter to communicate directly with it? And, if so, is there anything else that needs to be done, or do I simply point the flash tool at the correct com port & it automatically handles the rest?
also, does anyone know if the firmware tools that are out on the net will support this chip, the MST703-LF?
lastly, if anyone has anymore technical info on either the MSTAR protocol or on where I can get some example code or even a fully-functional source code base for an MSTAR firmware image, I'd really really appreciate it.