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trying TWI on Nano Curiosity 4809
I'm putting together a small protoboard project to read a MPU-6050 based gyro using I2C (fast mode).  (I previously was able to do I/O using a Arduino Uno 3 w/ 328p. ...
Saturday, 18 January 2020 - 22:28
notes on fixed versus floating point
I have no specific questions or requests for comment here.   I thought some peeps here may be interested. In another thread I started a project which involves designing...
Monday, 23 December 2019 - 19:54
avr-gcc generates no useful code for simple function
I wanted to see if avr-gcc supports alloca so I generated a little function file and peered at the assembly. To me this is not dead code, but the assembly does nothing. ...
Friday, 13 December 2019 - 14:21
my gcc8 built toolchain w/ ATmega DFP 2.0.12 not working for 4809
I'm working with the 4809 nano curiosity.  I had a routine to print a string constant.  It failed.  I traced it to the string constant not existing in sram. Looking...
Thursday, 28 November 2019 - 02:52
can't get uart comm going on nano curiosity (w/ mega4809)
I'm trying to get things going on a Microchip nano curiosity board w/ atmega4809 chip.   Code is posted below (where compile line includes -DBAUDRATE=9600).  I first run...
Monday, 25 November 2019 - 22:21
util/setbaud.h incompatible with new avr/iom*.h files
Hi All,   Tthe recent device packs have include files that use the symbol "BAUD" for a struct member.   This makes the 'historic" use of BAUD as a #defined variable...
Monday, 25 November 2019 - 15:49
mega32u4 timer0 fast PWM, non- vs inverting for compare output is significant
I ran an experiment to test using the fast PWM mode of timer0 for duty cycle control.  I learned something.   I wanted to set up the timer so that I could control period...
Wednesday, 6 November 2019 - 02:18
flaky avrdude operation with arduino micro on linux
I have an atmega32u4.  When programming with avrdude 1) I need to hit the reset button on the board before /dev/ttyACM0 becomes available, and then set the baud rate to 9600...
Saturday, 2 November 2019 - 21:27
suppress surge at the source on 120 vac house circuit ?
Hi All,   I have a printer that causes house lights to flicker whenever we submit a print job.  I believe this is a transient from the printer waking up and starting...
Monday, 30 September 2019 - 16:39
AVR generated 12v pulse, just for fun
Hi All,   I have not done any circuit design in 40 years, and that was freshman circuits (from Smith) and a senior MCU project (w/ 6800), but I have done a lot of embedded s/...
Saturday, 28 September 2019 - 15:29
blink LED on 4809
I have a 4809 based curiosity nano.   I want to blink the user LED.   The hardware data sheet says. So the LED has an external pull-up.  In order to...
Friday, 13 September 2019 - 02:16
4809 / 0-series TCA CMPnEN pin-select documentation does not make sense
Hi All,   I'm hacking on my Curiosity Nano with atmega4809.   I'm trying to set up TCA0 to toggle pin 5 on port F (the user LED). The 0-series datasheet indicates I...
Sunday, 8 September 2019 - 19:31

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