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confused about interrupts on AVR-0 series I don't understand how lower priority interrupts are kept from pre-empting a higher level ISR before the first instruction in the ISR executes. Here is the scenario: 1) high... |
Sunday, 4 July 2021 - 22:25 |
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OctOS: a simple tasking system for AVRs I posted about this previously in this thread. After that, I did go on to verify the code in SPIN and found errors. I revamped the code to be more amenable to use in C... |
Saturday, 3 April 2021 - 14:16 |
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16-bit copies and the TEMP registers on AVR 0-series Here is what is said in the megaAVR 0-series on 16 bit copies: The wording seems to indicate that if I read the high byte, I get a read from the TEMP register. But I'm... |
Saturday, 26 December 2020 - 00:50 |
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boost converter project using AVR-0 series Hi All, I posted in the "show off your 2020 project" thread about my boost converter project using ATmega4809. The post was getting some responses so I thought I'd start a... |
Thursday, 26 November 2020 - 15:37 |
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what CPU version is the ATmega4809 ? Hi All, In the Microchip AVR Instruction Manual, DS40002198A dated 2020, there is a table of AVR CPU versions. Do you know how I can find out which of these... |
Wednesday, 25 November 2020 - 17:18 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |