I like simple! And VB isn't simple at all - just different.
I appreciate the additional information. I'll give it a try tonight.
Thanks again!
remotewizard's Content
There have been 31 items by remotewizard (Search limited from 27-April 23)
#52442 Embarassing SPI question (re: Netduino Helper Max72197221.cs )
Posted by
on 29 August 2013 - 12:06 PM
in
General Discussion
#52436 Embarassing SPI question (re: Netduino Helper Max72197221.cs )
Posted by
on 28 August 2013 - 10:18 PM
in
General Discussion
I should probably ask if you could share the code for MultiSPI4SevenSegment.
#52431 Embarassing SPI question (re: Netduino Helper Max72197221.cs )
Posted by
on 28 August 2013 - 07:29 PM
in
General Discussion
Very nice! I'll try this as soon as I get home from work tonight! I'll keep you posted.
I note the Thread.Sleep in your write method - perhaps my problem was a timing issue?
Thanks to both of you!
#52418 Embarassing SPI question (re: Netduino Helper Max72197221.cs )
Posted by
on 28 August 2013 - 05:59 PM
in
General Discussion
Same thing: when I tried sending live data twice, only the first module responded. I'm reletively certain it's not a hardware issue, as I was able to get all leds on all modules to light using my Bus Pirate.
The two transfers is a good idea; I'll give that a try.
Do you think the new enhanced SPI (which permits transferes other lengths than 8 or 16 bits) might help?
Thank you as always, my friend, for taking the time to help.
#52412 Embarassing SPI question (re: Netduino Helper Max72197221.cs )
Posted by
on 28 August 2013 - 11:49 AM
in
General Discussion
I thought so too, and actually tried it that way first. It didn't work either. And researching the 7219 online lead to my trying it the other way.
Such a simple thing, and so frustrating!
#52399 Embarassing SPI question (re: Netduino Helper Max72197221.cs )
Posted by
on 27 August 2013 - 10:38 PM
in
General Discussion
I have one of the typical cheapo four-module 7219 LED matrices (e.g. four panels of 8x8 each, with power, ground, clock and cs daisy-chained; each module after the first gets it's DIN from the previous DOUT). I downloaded the current Max72197221.cs from Netduino Helpers, and was able to send letters and patterns to the first module. So far ,so good.
However, according to the 7219 datasheet, I should be able to address each of the subsequent modules by sending a No-Op after each row of data (the four 7219 chips acting as a shift register) for each module I want to move to the right. But sending what I think is the right value to the matrix doesn't work.
For example, I changed the original Max72197221.cs code to define SpiBuffer as ushort[2], and modified the Write subroutine as follows:
protected void Write(byte register, byte value) {
SpiBuffer[0] = register;
SpiBuffer[0] <<= 8;
SpiBuffer[0] |= value;
SpiBuffer[1] = (byte)RegisterAddressMap.NoOp;
SpiBuffer[1] <<= 8;
SpiBuffer[1] |= 0;
Spi.Write(SpiBuffer);
}
But the display doesn't - well, display. It also doesn't work when defining SpiBuffer[1] simply as 0 (without all the bit-shifting nonsense). Can anyone help me spot the flaw in my logic?
