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Forum Index : Microcontroller and PC projects : SDD1963 SD Card

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lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 02:14am 27 Mar 2016

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I've been reading the manual for the Micromite+ and it looks to me like although the SDD1963 display is supported and also the sd card that I cannot actually use the SD card on the back of the display?

Both the touch controller and the SD card use the same pins
T_DIN p5
T_CLK P4
T_DO P47

SD_DIN P5
SD_CLK P4
CD_DO P47

I assume clk is the clock pin so could be shared
din is data in? Pin 5 but it's labelled in the manual as SPI 2 OUT (MOSI)
do data out? or something else? Pin 47 but thats labelled as SPI 2 IN (MISO)

What exactly is CD_CS and I assume its the card something select
the touch controller is T_CS

Or is it simply they can both use the same pins but the cs pin (whatever it is) tells the micromite which device to read?
and the T_IRQ pin would be if the touchscreen is touched it interupts the micromite and tells it then sees the touchscreen?
sorry thinking and trying to work it out as I'm typing and trying to learn at the same time.

Sorry this is probably so simple for most of you but for me it's all new.

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9585

Posted: 02:52am 27 Mar 2016

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Yes, you can use the SD card slot on the display.

BOTH the touch controller AND the SD card are on the SPI bus, but because the SPI bus is a bus, you can have many things all in parallel on this same bus - hence the touch and SD card.

SPI devices use a CS line(Chip Select), which is pulled low by the controller, to signal that device that it is the one it wants to talk to. The other devices technically see this traffic on the bus, but totally ignore it, as their CS line is not pulled low.

Smoke makes things work. When the smoke gets out, it stops!

lew247

Guru

Joined: 23/12/2015
Location: United Kingdom
Posts: 1702

Posted: 03:08am 27 Mar 2016

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Ah brilliant, Thanks for explaining that, it makes perfect sense now

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