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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 |
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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 |
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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 |
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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 |
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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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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |