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What is the point of a User signature array?
This question is posed as a general question. Regular AVRs have Flash, Eeprom, Signature and Calibration memory. Xmegas have additional "User Signature Row" area. They also have...
Fri. Jun 24, 2011 - 06:43 PM
Building USBasp to run on a 16MHz Arduino
The package expects to run on a mega48 or mega8 with a 12MHz crystal. The usbdrv docs say that you can use a 16MHz crystal. It includes the relevant 16MHz ASM code according to...
Thu. Oct 7, 2010 - 09:38 PM
Debugging COFF and ELF files
I have recently been building the same program with avr-gcc, CodeVision, ImageCraft and IAR. I built the GCC and ImageCraft versions via the Studio IDE. CodeVision in its own...
Thu. Jun 17, 2010 - 01:56 PM
How fast can a SPI slave reply?
Using a microcontroller as an SPI Master is very straightforward. You can send commands directly to a hadware slave at full speed, typically 4MHz for a 16MHz clock. So the...
Sun. Apr 25, 2010 - 03:23 PM
mega8535. What is the point of this device?
As far as I can see, the mega8535 was an upgrade to a 90S8535. The mega16 does everything that the mega8535 does. And with JTAG. The mega164PA does even more. And is...
Thu. Apr 1, 2010 - 02:26 PM
Placing anonymous strings in flash with IAR compiler.
I am using the IAR KickStart freebie edition. The compiler defaults to writing anonymous strings to SRAM, and consequently uses up all the SRAM in a Tiny2313. printf("this...
Sun. Jan 24, 2010 - 09:59 PM
No IRQs generated for Mega128 Timer0 if XDIV is used
This topic came up on the CodeVision Yahoo forum about a Mega64. There is a TIMER0_COMP interrupt and a TIMER1_OVF interrupt and the system clock is divided by 4 using the XDIV...
Fri. Jul 24, 2009 - 05:41 PM
Avrdude: usbdev_open() did not find any USB device "usb
I can connect and program JTAG devices using my JTAGICE-mk2 via Studio4 or CodeVision. But when I try to use: avrdude -p m128 -c jtagmkii -v -P usb I just get an error:...
Thu. May 21, 2009 - 01:44 PM
I have damaged a STK600
I have an XPLAIN board connected to a STK600 via its JTAG header. (the STK600 supplies 3V via VTG on the JTAG header). I programmed the AT90USB1287 via the JTAG in the normal...
Tue. May 5, 2009 - 10:49 AM
Rowley CrossWorks AVR C Compiler and PSTR()
The PSTR() macro is commonly used with avr-gcc to place anonymous strings in flash. e.g. printf_P(PSTR("This string is in flash\n")); You can re-arrange the macro for...
Thu. Feb 12, 2009 - 10:20 AM
AVR307 USI Uart but with Tiny85
AVR307 code is written for a Tiny26 and IAR C. I have ported the code to both CodeVision and avr-gcc quite easily. However I cannot get the code to run. As far as I can see, a...
Thu. May 8, 2008 - 11:38 PM
Consistent delays do not really need optimisation
The avr-gcc _delay_us() macros cause an awful lot of grief in this forum. I do not think it is really necessary. This example shows the results that can still be achieved with...
Wed. Apr 23, 2008 - 03:10 PM

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