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How to use memory mapped IO in ATMega32A
The datasheet for the ATMega32A shows the IO ports as being memory mapped.  E.g., the address for PORTA is given as 0x1B (0x3B).   1.  What's the difference between...
Monday, 27 August 2018 - 02:11
External storage: USB or SD card?
I need to design a board that will have to access external, removable storage of less than 5MB.  The CPU needs to be an AVR with a USART and a handful of GPIO.  The most...
Friday, 20 July 2018 - 18:35
Ateml-ICE fails to enter programming mode in AS7
I'm trying to program an ATTiny85 via Atmel-ICE and debugWire from AS7, but I get an error:   My devices seem to be set up correctly: What might be causing this?...
Monday, 25 June 2018 - 04:54
OK to use a filter cap on RESET when using JTAG?
I'm designing an ATMega32A board, which is programmed and debugged via the JTAG interface.  The AVR042 app note recommends a .1 uF cap on reset unless you're using DebugWire...
Tuesday, 5 June 2018 - 21:33
Reflowing a previously soldered board
In a week or two I'm going to bring up a new board I've designed based on an ATMega32A.  It has a 5V regulator fed from an external 12V supply, 16 MOSFETS, an RS485 driver,...
Tuesday, 15 May 2018 - 15:36
ATMega32A: JTAG vs. debugWire
I'm starting a new design with the ATMega32A.  The chip supports both debugWire and JTAG, and I'm wondering what the benefits and disadvantages of each are.  I'll be...
Sunday, 6 May 2018 - 17:59
Have you ever driven a 16x2 I2C LCD?
I bought one of these inexpensive 16x2 I2C LCDs on Amazon.  There's no documentation, but I figured how hard could it be to get up and running, since I've used UART-...
Thursday, 8 March 2018 - 04:59
Seeking I2C app note code
I'm working my way through AVR315 (now AN2480) and it references TWI_Master.c and TWI_Master.h.  Atmel used to offer source code along side the associated app note...
Monday, 5 March 2018 - 03:51
Unable to connect to Atmel-ICE
I'm doing some ATMega328P development with Jumpstart C and Atmel-ICE on Windows 10.  Everything was working fine up until a couple of days ago when the IDE stopped being...
Friday, 2 March 2018 - 19:37
This is a test - ignore
Sorry.  Testing my malware blocker (Malwarebytes) which hasn't been letting me post here without disabling the entire app, despite the site being whitelisted.   Ed.:...
Monday, 26 February 2018 - 18:33
Unable to connect to AVRISP MkII with avrdude
I'm brand new to avrdude and trying to accomplish my first flash.  I'm on a Win 10 system.  Whether I try to write or verify, I get the same error:   avrdude:...
Thursday, 8 February 2018 - 04:48
How to flash an AT90S8515?
So I have a project from 2003 that I need to update.  It was based on the then state-of-the-art AT90S8515.  I still have the C code for it, and it still compiles, but I...
Thursday, 8 February 2018 - 01:31

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