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Forum Index : Microcontroller and PC projects : 7" SSD1963 now with video RAM?
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9753 |
Hi there.  The latest offerings in the 7" LCD family, seem to have on-board VRAM. See this listing as an example.  Can the MM+/MMX/ArmMite make any use of the onboard VRAM? Are they a better choice then the RAM-less versions? They only cost three bucks more then the standard version..... Smoke makes things work. When the smoke gets out, it stops! |
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| matherp Guru  Joined: 11/12/2012 Location: United KingdomPosts: 10572 |
These use a different driver to the SSD1963 and are not currently supported by any of the MM implementations. I don't have one of these displays and can't justify buying one given that they aren't cheap. The VRAM on the SSD1963 is internal to the chip, on these it happens to be external. The only advantage over the SSD1963 is that there is enough RAM to hold three pages but implementing useful access to this would need significant work within MMBasic, particularly with respect to how GUI works. Rather than more RAM mapped by the graphic controller chip, the big win would be to have the VRAM directly mapped into the processor address space. The Armmite H7 does this by default for all displays except 800x480 without impact on user RAM (512Kb). It can also do it for 800x480 displays with user RAM reduced to 98Kb. A proper MMBasic port to the DA version of the PIC32MZ would have plenty of RAM but would interface to a display without any controller. |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9753 |
Cool, thanks for that. Back to the standard display then. Smoke makes things work. When the smoke gets out, it stops! |
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| geeken Newbie  Joined: 13/01/2018 Location: United StatesPosts: 20 |
Display controllers with external VRAM (often just DRAM) kick in at about 9" and above size displays, due to the increasing size of memory required. As far as chipsets go, the RAIO-8876 graphics controller supports external DRAM. It is similar to its sibling, the 8875, which has internal RAM like the SSD-1963. There is an RAIO-8876 display board available from www.buydisplay.com, among other suppliers. Has anyone ever compared the SSD-1963 with the RAIO-8875/6, for ease of usage and features ? |
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