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OctOS: a minimalist preemptive multi-tasking "OS" for AVR
Last fall I wrote a multitasking system for AVR micros.  My goal is to shoehorn solid capability into a small space.   I have no specific questions, just looking for...
Friday, 28 August 2020 - 15:24
mega4809 crystal calibration problem: status report
  Hi All,   ka7ehk started a thread here looking to calibrate the mega4809 crytal using the RTC.CALIB register.  You have a 32768 Hz crystal connected (to the RTC...
Saturday, 22 August 2020 - 01:47
mega4809 RTC PIT scaling for events not what I expected
As stated in another thread, I have been working with the Microchip 4908 Curiosity Nano to pipe the RTC PIT, clocked by the external crystal, to TCB0 using the event system....
Sunday, 16 August 2020 - 18:48
nano curiosity 4809: TCB0 FRQ mode not getting capture value
    Hi All,   I've made progress on working with clocks on the mega4809 on the Microchip Nano Curiososity board.   I have the 32768 Hz external crystal driving...
Friday, 14 August 2020 - 20:17
nano curiosity 4809: can't enable ext 32.768 kHz oscillator
Hi All,   I have a Nano Curiosity 4809.  I was trying to get the RTC working with the external crystal but I'm failing. I trimmed down code to enable the oscillator and...
Tuesday, 11 August 2020 - 15:12
Q on mega 0-series TWI slave protocol
  Hi All,   I'm working on a state transition diagram for slave mode I2C software.  I've started with the read part.  See diagrams below. Here is the question...
Tuesday, 16 June 2020 - 19:33
cheap, small logic analyzer
  DId a search for logic analyzers.  Last thread was 2013.   I'm thinking of this USB one from inno, listed on Amazon as the Inno Maker LA1010 USB for $79.  ...
Wednesday, 5 February 2020 - 02:00
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

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