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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... |
Friday, 24 June 2011 - 18:43 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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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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... |
Thursday, 8 May 2008 - 23:38 |
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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... |
Wednesday, 23 April 2008 - 15:10 |