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help with expanding my byte
I need to take 1 byte and expand it to two bytes adding a negative bit. 0 to -65535 128 = 0 256 to 65535 then stuff back in to two bytes.   This was my attempt  ...
Thursday, 20 December 2018 - 02:44
Help with Lufa usb 2.0 spec.
Firstly, I didnt really see any LUFA specific forums (fora) out there, are there any? Second, I'm coming from v-usb to LUFA. So there are areas I will fall short in. For the most...
Saturday, 15 December 2018 - 22:42
manual programmable uart
I'm looking for a very simple uart I can use that will allow setting baud config manually (like with dip switches or pull ups).  Would like to read the uart data via pins (...
Wednesday, 14 November 2018 - 12:53
avrisp usb programmer installed but won;t show in arv studio 6
Can't seem to get avr studio 6 to see my tool. I removed avr studio and reinstalled it and the driver now shows up in device manager (guess jungo is no longer used?). Though avr...
Saturday, 15 September 2018 - 16:43
using watchdog to pass time
I have to know when 2 ms passes in a loop where elapsed code time is not predictable.  The timing is not critical a few 100 us resolution is fine. I was thinking the watch...
Saturday, 8 September 2018 - 20:14
atmega328 SIG_INTERRUPT0 vs int0
I'm working with v-usb and there is this tidbit. /* The following configurations have working defaults in usbdrv.h. You * usually don't need to set them explicitly. Only if you...
Tuesday, 21 August 2018 - 13:03
I'm confused with sbi cbi commands?
I'm trying to add some debug to my ASM and wanted to see it on a scope. So I simply used   sbi PORTB,2;//debug and cbi PORTB,2;//debug   But I only see one condition not...
Sunday, 29 July 2018 - 19:11
Setting a flag in ASM
I want to set a simple global flag in ASM but I'm struggling to make it work.   In my S file I have   an include to my global var (_SOF_Flag)   I did this  ....
Sunday, 15 July 2018 - 20:55
How to know if an interrupted fired.
If I set an int. then loop, how can I check if the int. fired?   EIMSK |= (1 << INT0); //enable interrupt. Dostuff(){}; if (x) {//int fired }      
Wednesday, 11 July 2018 - 02:15
Confused about program space increasing.
I have a smell function for my SPI   static char spi_mSend ( char data) { SPDR = data; while(!(SPSR & (1<<SPIF))); _delay_us(100); return SPDR; }...
Saturday, 7 July 2018 - 15:56
using twi for the apple desktop bus.
I currently bit bang (fixed for awneil) the ADB but with some struggle in c, I was going to convert to ASM. Before I do I wanted to try the TWI and see if that does not help...
Monday, 2 July 2018 - 14:20
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