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fastest way to set multiple pins?
I'm stumped trying to figure out the correct C statement(s) to set several pins all at once, for fastest execution. Here is an example: #define ACK_0 PB3 // MSB #define ACK_1...
Saturday, 10 October 2009 - 18:07
total DC current allowance for all pins?
I'm trying to find out how to determine total current allowance for output pins, or whether it has to be deduced from other items in the electrical characteristics listings. For...
Friday, 31 July 2009 - 01:56
mysterious output on LED blinker
Starting a new project, I've become accustomed to first setting up the clock and a single LED to blink at a known frequency to make sure the clock is correct. This morning I did...
Saturday, 25 July 2009 - 16:31
I/O between controllers?
With the built-in pullups on input pins, I learned to ground a pin using a button to act as input to an AVR. But if I have two controllers, say MCUA and MCUB, and I want to send a...
Thursday, 16 July 2009 - 15:08
tiny861, three servos and garbled data
I have a tiny861 "coprocessor" in a project that accepts commands from a main processor. I'm using a data line, clock line, and alert line to transmit the commands, triggered off...
Sunday, 17 May 2009 - 21:23
TWI address for slaves?
I've been studying various articles about implementing TWI on the ATmegas, but every one I've seen so far is either connecting to a non-TWI chip (like the tiny2313) or to a I2C...
Friday, 8 May 2009 - 18:54
PWM mega88 and MC33887
I'm trying to drive a DC gearmotor using a potentiometer for "throttle" control. It works great, but only in one direction. The MC33887 datasheet shows two inputs, A and B. I'm...
Friday, 17 April 2009 - 03:47
actual printed C books?
I'm getting along in my learning, and now am needing a good C reference... Of course there is K&R from the old days, but is there anything better? I Googled "best book C site:...
Friday, 10 April 2009 - 19:06
HVSP on ATmega88?
I believe I misconfigured the fuse bits on a mega88 and have read with interest the idea that it could be restored using high-voltage programming.... I have a Dragon, not used...
Tuesday, 7 April 2009 - 19:21
confused wiring DIP oscillator
I'm trying my first serial communications project (ATTiny2313) and got a 14.7456 MHz oscillator. I got the DIP form because it looked convenient -- didn't realize it all sorts of...
Thursday, 12 March 2009 - 14:31
trouble with first interrupt program
Imagine this, it didn't work the first time? My first try at interrupts, and I feel I'm close. I'm probably wrong, because it's not working. AVR Studio 4.16 with GCC, tageting...
Sunday, 8 March 2009 - 05:19
trouble with first interrupt program
Imagine this, it didn't work the first time? My first try at interrupts, and I feel I'm close. I'm probably wrong, because it's not working. AVR Studio 4.16 with GCC, tageting...
Sunday, 8 March 2009 - 05:19

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