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PTC Baremetal / without QTouch Library
I'm using an ATSAML21 chip.  The datasheet section on the Peripheral Touch Controller is a joke - no registers listed, and the Functional Description doesn't describe squat....
Sunday, 16 February 2020 - 12:46
Demystify DAC Empty Event on SAM L21?
I'm building a project using the DAC on the SAM L21.  I thought I could use the DAC's EMPTY0 event to feed new samples into DATABUF0, but it's not working the way I would...
Tuesday, 11 February 2020 - 08:14
Reading/writing a SAML21 pin clobbers synchronous event output to all other pins
While troubleshooting the DAC on my SAM L21, I tried to set up a pin to monitor one of its event signals.  I configured a new channel that triggers off the DAC's EMPTY0 event...
Monday, 10 February 2020 - 12:49
Source for __libc_init_array and other mystery code showing up in my disassembly
I have a very simple Atmel Studio 7 project for the SAM L21, and the disassembly shows some machine code generated after the end of my vector table, but before my reset handler or...
Friday, 31 January 2020 - 04:01
Stepping artifact on SAM L21 DAC transitions
I'm seeing this stepping artifact coming from the DAC of an ATSAML21J18B on a SAM L21 Xplained Pro board at the start of conversions:          ...
Friday, 24 January 2020 - 09:31
DISKIO for SAM L21
I'm using Atmel START to generate a project for my SAM L21 Xplained Pro (ATSAML21J18B).  When I attempt to add a DISKIO middleware component I get the error "Missing...
Thursday, 9 January 2020 - 07:05
Atmel SAM L21 CPU startup
I'm reading the datasheet for the SAM L21 family and in section 9.3.4 Fetching of Initial Instructions it mentions: After Reset has been released, the CPU starts fetching PC and...
Monday, 6 January 2020 - 21:41
Missing symbols in avr-libc
I'm using an ATtiny861a, and noticed iotn861a.h has several macros defined under "Device Pin Definitions", for example: #define PB0_DDR DDRDOSI #define PB0_PORT PORTMOSI #...
Thursday, 10 October 2019 - 02:57
AVRDUDE Could not find USB device "USBasp" error, despite driver being installed
I'm trying to program an ATmega162 using my 51 AVR ISP programmer.  When I run avrdude, I get this error:   C:\Program Files (x86)\Atmel Studio\AVRDude>avrdude -p...
Friday, 8 June 2018 - 18:10
Keyboard Shortcut and Menu Bugs in AVR Studio 4
Apologies if any (or even all) of these have been reported before. 1) Customized keyboard shortcut for Build command not honoured To reproduce, remove F5 from the RUN command and...
Thursday, 27 August 2009 - 05:51
When to set Sleep Enable
Generally the Atmel datasheets are pretty clear, but I'm trying to figure out how to interpret this tidbit: Quote:The SE bit must be set (one) to make the MCU enter the Sleep mode...
Wednesday, 26 August 2009 - 06:54
Volatile or Register?
Hi guys, I'm trying to squeeze all the optimization I can out of GCC, and wouldn't mind some input. I have global variables that are updated in an interrupt. I've noticed when I...
Tuesday, 25 August 2009 - 05:51

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