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Xmega ADC noise
In my application with the xmega32a4u, I switch between various ADC inputs and modes and it works fairly well, but there always is unexplained noise in the LSBs.   To...
Saturday, 5 December 2020 - 06:51
Low speed vs full speed USB
Full speed requires the 48 MHz oscillator and 12 MHz minimum MCU clock. My application is very simple: the xmega32a4u waits for a command on a USB CDC serial port and responds...
Tuesday, 24 November 2020 - 23:04
XMEGA 32 MHz oscillator calibration using 32.768 kHz crystal
Using a spectrum analyzer on the power pins, I noticed that calibrating the oscillator using USB start of frame or a 32.768 kHz crystal both give a very accurate 48...
Friday, 20 November 2020 - 21:56
ASF USB HID latency
I am developing a gaming mouse using XMEGA32A4U. USB is setup according to the Atmel app note as full speed and with 48 MHz internal PLL, 24 MHz CPU clock.   Using ...
Friday, 13 November 2020 - 05:00
I2C SSD1306 and XMEGA
The ASF library is written for SPI, but the displays with attached breakout board are predominantly I2C. I'd appreciate any advice on how to drive them.   Atmel Studio 7...
Saturday, 22 August 2020 - 04:45
Atmel Studio + XMEGA and global variable corruption
I have a fairly large Atmel ASF (v7.0) project with composite USB and ADC that is used in a custom board with ATXmega16A4U (sensor). Everything has been working well for...
Saturday, 15 August 2020 - 03:58
XMEGA ADC saturating too early
I am using ATXmega16A4U. VCC & AVCC are at 3.3V. ARef is at 2.49V (measured), but the ADC saturates (reading 4095) at 2.37V. I have tried both single ended and differential...
Friday, 24 July 2020 - 20:29
Can I connect PDI Data pin to another pin for a debug / programmer port?
I'd like to add debug functionality (through PC3 - USART TXD0) to the 4 pin programming header I have on the board.   Since I'd like to keep the existing header for...
Thursday, 9 July 2020 - 01:11
XMEGA and USB
I am working on my first project with XMEGA (atxmega16a4u) which is a USB PC peripheral that implements a serial port and a HID mouse. I'd like to use the serial to control...
Wednesday, 18 March 2020 - 02:04
Solved: Boot loader is not updating the program
  In my application, the main program decides that it is out of date and then calls the bootloader to do the update. It also marks that in the EEPROM, in case there is a...
Sunday, 19 May 2019 - 23:15