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Enabling OC1B output on a Tiny85.
With regular Mega or Tinys,   you just make DDRx.y an output for an OCnx pin,   and set the COMnxy bits for your specific output mode.   OC1A and OC0A...
Friday, 19 September 2014 - 15:23
Reading Pixels from GRAM memory in ILI9341 and ILI9325
I composed this reply to a question from "lekter" that was deleted while I was typing: So I thought that I will post it myself. uint16_t readPixel(int16_t x, int16_t y) {...
Sunday, 13 April 2014 - 10:28
ATtiny2313A, ATtiny4313 and RSIG in SPMCSR
The old tiny2313 could read fuse and lockbits but not Signature/Calibration bytes. When the tiny4313 came out, RSIG is shown in the "24. Register Summary" in the shared "...
Tuesday, 10 December 2013 - 15:40
TFT Colour LCD controllers with SPI interface
I have been playing with a very nice 320x240 display on an Arduino shield. It uses a ILI9320 controller and its 8-bit interface. Other displays use 16-bit i/f have a 20x2 pin...
Tuesday, 12 March 2013 - 14:32
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

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