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why does the update_block not work?
Can't seem to figure this out. the first line work, the second does not.   for (char e = 0;e<24;e++)    eeprom_update_byte(33+e,mapper[e] );//works, saves...
Wednesday, 27 June 2018 - 00:43
Help with nRF24L01+ datasheet
Using this sheet https://www.sparkfun.com/datashe...   I'm trying to figure out two things.   1) There is a section on timing but I'm a bit confused what SPI Clock rate...
Tuesday, 26 June 2018 - 16:52
interrupt free spi communication.?
The typical communication of an spi as I understand it  looks like this.          SPDR = data; // Load data     while...
Friday, 22 June 2018 - 16:54
interfacing with usb (FT232R)
I have an application where I want to interface with usb device. That is to say, read usb in to a mega chip. I'd like not to do the work on the mega chip and instead use another...
Tuesday, 19 June 2018 - 10:53
will using eeprom_update_block be more efficient?
I have a few lines of code where I do something like this   for (char e = 0;e<24;e++)    eeprom_update_byte(33+e,mapper[e] );  I was reading up on the...
Wednesday, 23 May 2018 - 03:06
memory allocation question.
I'm cretin there is no way to achieve this but figured I had better ask. I have a situation where I will be sending data to a computer via USB. I'm using an atmega 328 with a usb...
Saturday, 19 May 2018 - 18:55
Solved: need a bit of math help with an array
I have this     for (int d = 0; d < 192; d++)     {         sendData( tmp = *(data + (d&0xfc) + (3-(d&0x03...
Monday, 14 May 2018 - 22:46
5 volt power feasibility
I'm looking in creating a project using the atmega32u2. This design will have multiple uses. But in all cases it will run off power from various gaming console controller ports....
Tuesday, 13 February 2018 - 18:52
Operating Voltage Range
If a chip (atmega32u2) says Operating Voltage Range (V) is 2.7 to 5.5. Does this mean using an external oscillator will remain constant in that range? That is to say 3.3 will not...
Monday, 12 February 2018 - 19:58
atmega32u2 HID bootloader.
As I understand it there are 3 versions of the bootloader for this device (HID, DFU, and CDC). I ordered a  breakout board from the net and when I connected it via USB an...
Friday, 22 December 2017 - 16:50
D.I.Y atmeg board overflow.
I have a board overflow (500 units) I'm looking to rid of. (chip not included)   1) USB ready if using v-usb 2) all of port C and B exposed to pins.  As well as Port D...
Wednesday, 20 December 2017 - 01:17
help with some ASM
What I'm looking to accomplish here is a bit of a hack to the v-usb project. Normally the assembly will return on interrupt. I need to make it return regardless if the interrupt...
Friday, 10 November 2017 - 13:31

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