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Trouble Writing to Parallel SRAM
jgmdesign wrote: Which makes me think that : MalphasWats wrote:I'm also powering it from a 5V 1A external supply   Is not as good as its rating.....   Yeah, I'd really...
Tuesday, 14 April 2020 - 10:07
Trouble Writing to Parallel SRAM
I've replaced the electrolytic caps with some ceramic ones. I don't have the right values on hand at the moment though, so I'll have to order some more.   Kartman wrote:What’...
Tuesday, 14 April 2020 - 10:06
Trouble Writing to Parallel SRAM
Bingo600 wrote: Nice it's working ... But where is JTAG on that MCU , people have been bitten by not disabling that     Ha, yeah, I get bitten by JTAGEN every time I...
Tuesday, 14 April 2020 - 09:51
Trouble Writing to Parallel SRAM
MalphasWats wrote:   I'm going to rewire it a bit more simply.   So, I rewired the whole thing, took out the LEDs and replaced them with a serial connection.   It...
Monday, 13 April 2020 - 13:11
Trouble Writing to Parallel SRAM
Kartman wrote: What value are the resistors on the leds? Try putting the 5V and 0V power wires from one side of the chip to the other. Your current setup has a rather torturous...
Monday, 13 April 2020 - 10:42
Trouble Writing to Parallel SRAM
I did another test thing before I start yanking wires.   I changed the write loop to write the numbers 0 - 255 in the corresponding memory addresses. Then read it back one at...
Monday, 13 April 2020 - 10:04
Trouble Writing to Parallel SRAM
Brian Fairchild wrote: Your schematic doesn't show a GND connection to pin 31.   it is, I think I used the wrong symbol in the schematic and didn't notice it missing. I drew...
Monday, 13 April 2020 - 09:38
Trouble Writing to Parallel SRAM
Scroungre wrote:I'd like to see a lot more capacitors myself.  Better lots of little ones than a few big ones,  but I'd stick a big one (electrolytic, 220uF or so) in...
Monday, 13 April 2020 - 09:37
Trouble Writing to Parallel SRAM
Kartman wrote:Picture is a bit dark. I think you need some better debugging tools. I’d suggest getting a serial link happening. A cheapy saleaea logic clone logic analyser is also...
Sunday, 12 April 2020 - 23:01
Trouble Writing to Parallel SRAM
Kartman wrote:The code looks ok, how about your hardware? Picture?   ignore the extra chips, they're not in use in this version! Powered at 5v from my ISP.  
Sunday, 12 April 2020 - 22:42
Trouble Writing to Parallel SRAM
jgmdesign wrote:A good test would be to do a data increment I. Your loop to read back. Meaning, start at address 0, and put a 0x01 in it. Then increment the address, and increment...
Sunday, 12 April 2020 - 22:30
Trouble Writing to Parallel SRAM
Kartman wrote:Show us the rest of your code. There may be more than one problem   Here's the whole thing:   #include <avr/io.h> #define F_CPU 1000000 #define...
Sunday, 12 April 2020 - 22:26

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