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How would you setup the interrupts for this on the mega4809 This is for my multiplexed quad 5x7 display. The device will be a SPI slave and allow daisy chaining the display so it will have its MISO connected to the next displays MOSI... |
Monday, 9 September 2019 - 23:44 |
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Any tips for labeling pins with #define My tried a true method for the mega series was this: #define PIEZO_PORT PORTB #define PIEZO_POS_PIN 0 #define PIEZO_NEG_PIN ... |
Wednesday, 4 September 2019 - 01:34 |
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Pin current consistency / atmega 4809 I've got a breadboard up and running with an adapter that uses four LTP-305G displays, each is 5x7, so this is 20 columns by 7 rows. Using some dual logic level mosfets (... |
Thursday, 29 August 2019 - 22:42 |
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mega1284 tqfp capacitor on all 4 vcc/gnd pins? This project has very little power use from the AVR - nearly everything is high impedance except maybe one LED which will be less than 5mA. Does it really need a bypass cap... |
Thursday, 22 August 2019 - 03:19 |
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Producing an opposite signal from output compare... I want to drive a piezo and there are two ways. Maximum volume comes alternating both signals at the same time like this: DDRD|=_BV(6) | _BV(7);... |
Sunday, 18 August 2019 - 03:28 |
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Would you guys use the shutdown feature of this? I'm making a floppy drive emulator for the Epson PX-8 CP/M computer. It is basically an atmega1284 + hcms 8 char LED display + microsd socket + rs232 transceiver + a couple... |
Saturday, 17 August 2019 - 18:13 |
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Best 3 pin order for custom UPDI connector... For many years I've used what I call "inline ISP" which is basically just the 2x3 ISP connector put into a 1x6, still 100 mil. It allows programming from either side of the... |
Thursday, 15 August 2019 - 02:40 |
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ISR Multiplexing strategy with brightness/gamma adjustment My plan to support multiple brightness levels has been to run the ISR a multiple number of times faster. For example, if I want 100 Hz refresh and have 8 rows, that would be... |
Wednesday, 14 August 2019 - 22:56 |
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324PB max gnd and vcc current... The datasheet says 100mA max, but the 324P says 200mA max - 100mA seems pretty low. |
Tuesday, 13 August 2019 - 02:32 |
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microsd - how long do you wait before trying to access I want to give the user enough time to make sure the card is seated - the socket I'm using seems especially touchy with the CD signal. It switches it to ground or open and... |
Monday, 29 July 2019 - 21:53 |
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Using MSPIM for buffering On a mega1284 last night I was using the regular SPI at clk/2 and because of no buffering there are gaps between bytes being transferred. I suppose this is the nature of SPI... |
Thursday, 25 July 2019 - 12:26 |
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How would you configure the ADC for 2 cell low battery Consider that the 2 cells could be alkaline or NiMH and that they will be fed to a boost regulator that pushes them up to 3.3V. A fully fresh alkaline pair could also be 3.... |
Tuesday, 23 July 2019 - 02:48 |