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wake from sleep with and without debugger
On my ATSAMD21 Xplained Pro board, I have a relatively simple program that drives the RTC from the OSCULP32K and does the following: sets the RTC COMPARE register for 1 second in...
Monday, 3 August 2020 - 13:24
Creating a custom serial driver w/o modifying ASF4 files
This may be a fool's errand, but I'd like to create a custom serial driver (more on that in a moment) and I'd prefer not to monkey patch any of the ASF4 / START source files....
Wednesday, 29 July 2020 - 03:45
SAMD21 has insomnia [Solved]
Problem statement: I want my SAMD21 to wake on an RTC (match) interrupt or EXTIRQ button push, but it continues immediately from the __WFI statement.   My hunch is that there...
Saturday, 18 July 2020 - 21:58
SAMD21: setting RTC COMP clears READREQ.RCONT (!?!)
This is related to:      https://community.atmel.com/foru...   It appears that simply setting the RTC COMP register using the ASF4 api clears the RTC.READREQ....
Saturday, 18 July 2020 - 20:26
Wake from STANDBY upon receiving a character?
I have a nagging suspicion this has been asked before, but:  Is there a way to wake the processor from STANDBY state on a USART received character AND not lose the character...
Sunday, 5 July 2020 - 21:13
Can two Event Generators trigger one Event Channel?
Can two Event Generators trigger one Event Channel?  Or -- more or less equivalently -- can two Event Channels trigger the same action in an Event user?   In my case, I...
Monday, 25 May 2020 - 04:53
How to capture pulse width with 32 bit resolution on the XMEGA
(Preamble: having struggled with this longer than I'd like, I'm writing this up as a tutorial on the hopes that it might be useful to someone else, including the "future me".)...
Saturday, 23 May 2020 - 15:48
DFLL clock rate changes across STANDBY [solved]
My target machine is a SAME54 using SERCOM2 for printfs().  The following code is supposed to print out a message then go into STANDBY mode until there's a button press, then...
Wednesday, 29 April 2020 - 04:29
Generating ADC read from GPIO PORT event
Environment:   I'm using an XMEGA16D4 with code developed using Atmel START / ASF4 and compiled on Atmel Studio 7.   Problem Statement:   My goal is to initiate ADC...
Saturday, 7 March 2020 - 01:01
i2c_m_sync_cmd_write confusion
I'm communicating with an ADXL345 Accelerometer using Atmel START / ASF4 calls.  Read operations work (single and multi-byte), but write operations always return 0. ...
Wednesday, 22 January 2020 - 23:01
"find referents" (inverse of "find references")?
In AS7, it's easy to find the functions that CALL myFunction() via VAssistX => Find References.   But I'd like to find the functions CALLED BY myFunction(), ideally in...
Tuesday, 21 January 2020 - 18:09
QTouch code examples for Touch SLCD Xplained Pro?
I'm running the SAML22 Xplained Pro board with the Touch SLCD Xplained Pro peripheral.  I've run the Atmel START "SLCD Example" which displays all of the segments on the LCD...
Monday, 20 January 2020 - 03:17

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