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Looking for advice. Need to move up from ATmega
Hi, I've been working with the ATmega and ATtiny series of mcus for a while now, and I now have a pretty good feel for how they work, what they are capable of, and how to get the...
Mon. Mar 18, 2013 - 05:53 PM
JTAG Daisy Chain trouble
Hi, I am trying to step up a JTAG daisy chain, and I am not having much success. To keep things simple, I've got 2 atmega164p(s) setup in accordance with this diagram... Then I'm...
Tue. Jan 15, 2013 - 08:13 PM
Signal Ground vs. Shielding Ground
Hello, For years now, I've been running a lot of ground plane around on my PCB boards to protect from EMI noise. This ground plane is the same as the regular old system ground...
Thu. Jan 10, 2013 - 10:02 PM
Processor won't run without JTAG?
Hi, I've been working on a relatively complex (for me!) project. Basically, I'm talking to a adxl345 accelerometer over SPI with a atmega164P and then using the 164p to format...
Mon. Dec 17, 2012 - 10:48 PM
Varible behaving oddly in an Interrupt
I'm having some difficulty with variables that are used in interrupts. Here is my code... // Global Variable Delaration. volatile unsigned char usartReceivedStr[24]; volatile...
Fri. Jul 27, 2012 - 04:12 PM
Memory Leak
Hello. I've come to the conclusion as a result of an intermittent MCU software reset that I've got a memory leak some place in my code. For the life of me I am not able to find...
Fri. Jul 20, 2012 - 05:41 PM
Usart hanging?
So, I've got my usart speaking modbus decently well thanks to the help of you all on the board. But periodically the usart seems to hang. Here is my code... void...
Thu. Jul 19, 2012 - 07:46 PM
Weird Reset
Hello, I've been playing around with the FreeMODBUS demo for avr. I've got things working so that the master will send a frame and then the slave (avr) will send response about...
Mon. Jul 16, 2012 - 05:49 PM
MODBUS checksum errors!
Hello, I'm building a system that will use a linux MODBUS master to communicate with a number of atmega164P slaves vie rs485. Right now, I'm trying to get the freeMODBUD demo up...
Thu. Jul 12, 2012 - 08:29 PM
Can't see my JTAG mkII for some reason?
Hi, I've been using a linux development environment for programmain avrs forsome time now. i've also been using my JTAG mkII successfully with avarice to program and debug...
Sun. Aug 7, 2011 - 11:00 PM
Thermal Resistance
I've recently become very interested in heat dissipation and thermal resistance issues, and I could use some guidance. I'm contemplating a design and I can go one of 2 ways... 1)...
Mon. Nov 15, 2010 - 10:40 PM
How crisp is a Mosfet's Threshold Voltage?
Seems like mosfet threshold voltages vary quite a bit from the manufacture's data sheets, but how crisp are they? Crisp? I don't know what the proper word for this is, but ideally...
Thu. Nov 4, 2010 - 07:52 AM

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