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ENC28J60 Web server from SD Card
I have got a web server running quite successfully with a Wiznet W5100 Ethernet chip. It serves files with long filenames on a FAT16 microSD memory card. I thought that I should...
Saturday, 8 December 2012 - 23:54
Populating Dataflash on Xmega128-A1-Xplained board
The new Xplained board is unpopulated, but has pads for AT45DB or AT25DF chips. As far as I can see AT45DB chips are only in leadless packages. The AT25DF come in SOIC-8. There...
Wednesday, 25 July 2012 - 14:50
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...
Friday, 24 June 2011 - 18:43
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...
Thursday, 7 October 2010 - 21:38
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...
Thursday, 17 June 2010 - 13:56
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...
Sunday, 25 April 2010 - 15:23
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...
Thursday, 1 April 2010 - 14:26
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...
Sunday, 24 January 2010 - 21:59
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...
Friday, 24 July 2009 - 17:41
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:...
Thursday, 21 May 2009 - 13:44
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...
Tuesday, 5 May 2009 - 10:49
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...
Thursday, 12 February 2009 - 10:20

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