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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
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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