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| blog:2022:08:09:2022-08-09_-_slowly_programming_slow_avrs [2022/08/09 19:24] – created basz | blog:2022:08:09:2022-08-09_-_slowly_programming_slow_avrs [2022/08/21 19:06] (current) – fix ATtinty comparison page basz |
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| ===== genesis ===== | ===== genesis ===== |
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| since the thing is solar-powered, it's crucial to keep power usage as low as possible (step-up DC/DC losses + blinking LED are already eating up a lot), so i decided to go with [[ATtiny microcontroller comparison chart|ATtiny13]]'s lowest possible frequency -- internal RC oscillator, running at 128kHz, with internal prescaler set to 8... ending up at 16kHz! :D felt awesome... until i've flashed fuse-bits to enable the oscillator and chip stopped responding. | since the thing is solar-powered, it's crucial to keep power usage as low as possible (step-up DC/DC losses + blinking LED are already eating up a lot), so i decided to go with [[wp>ATtiny microcontroller comparison chart|ATtiny13]]'s lowest possible frequency -- internal RC oscillator, running at 128kHz, with internal prescaler set to 8... ending up at 16kHz! :D felt awesome... until i've flashed fuse-bits to enable the oscillator and chip stopped responding. |
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| first i though i screwed up fuse bit values, and disabled serial programming (happened to me in the past). since this is SMD, i'd need to re-solder a new unit to make it working... instead i decided to drill down a bit and see what's up. [[https://www.engbedded.com/fusecalc/|AVR fuse calc]] confirmed i've set all the bits correctly (cross-checked with datasheet). then i came across a post on [[https://www.logikdev.com/2011/02/15/reset-clock-fuse-bits-on-avr/|how to reset fuse bits via programmer]]. long story short -- you can reset fuses like this: | first i though i screwed up fuse bit values, and disabled serial programming (happened to me in the past). since this is SMD, i'd need to re-solder a new unit to make it working... instead i decided to drill down a bit and see what's up. [[https://www.engbedded.com/fusecalc/|AVR fuse calc]] confirmed i've set all the bits correctly (cross-checked with datasheet). then i came across a post on [[https://www.logikdev.com/2011/02/15/reset-clock-fuse-bits-on-avr/|how to reset fuse bits via programmer]]. long story short -- you can reset fuses like this: |
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