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How can I dynamically determine heap used?
I am working on a safety critical medical device on a SAMV71. One of the requirements is that the program monitor the heap usage dynamically and generate a warning when the...
Friday, 11 February 2022 - 14:19
ASF 4 Flashdriver Callback causes infinite loop
I am using the ASF 4 EFC driver routines to write to internal flash on a SAMv71.  I registered a callback so that I can tell when the Flash is ready to accept a new command....
Thursday, 11 February 2021 - 21:43
Why Can’t I see Watchdog Reset in RSTC? (SAMV71)
I have written code to determine the cause of a Reset on a SAMV71. The RSTC Status Register contains a code that can tell me if the CPU reset was caused by General Reset (powerup...
Thursday, 4 February 2021 - 21:14
SAMV70 – How to Run ADC without Interrupts?
I am trying to figure out how to run the ADC without interrupts on a SAMV70 using ASF4. My current code runs both ADC0 and ADC with all channels sampling at 20 msecs using...
Thursday, 7 January 2021 - 19:39
Atmel Start ASF4 Bug List
I have now been using the Atmel Start (AS4) tool for 8 months and I have compiled a list of the bugs I have found so far. Please feel free to add to this list. I hope this will...
Monday, 30 November 2020 - 16:16
Error in ASF Uart Interrupt Handler?
I am tracking down an issue where I lose occasional bytes received through the UART (SAMV70).  I am running at 115Kb. I am using RX interrupts and setting the UART to...
Saturday, 21 November 2020 - 22:08
Problem with V70 Quadrature Decoder
I am using a SAMV70 processor as a Quadrature decoder to read a position sensor.  I have it configured for just Timer Counter Channel 0 with no Index.  My sensor counts...
Saturday, 14 November 2020 - 19:05
How can I independently change PWM channel settings in ASF4?
Atmel Start has a driver for PWM that allows you to control up to 4 PWM channels. The configuration lets you set the initial period and duty cycle for the PWM channels.  I...
Friday, 2 October 2020 - 19:31
Can Pullups be enabled on Analog Input pins?
I would think that pull-ups / pulldown resistors are disabled (SAMV71, ASF4) when an Analog function is selected for an ADC pin. However, I can’t find anything in the data sheet...
Wednesday, 9 September 2020 - 20:37
How to write to GPNVM on V71 from program?
I want to use the SAMV71 built in bootloader to boot my program from USB.  In order to get the V71 into bootmode from my application software, I need to change the GPNMV bits...
Wednesday, 26 August 2020 - 18:12
My ASF4 USB CDC Virtual Comm port works, but Why? (SOLVED)
The information on using ASF4 with USB is somewhere between sparse and non-existent as far as I can tell. I actually have my USB CDC virtual COM port working.  However, I am...
Friday, 21 August 2020 - 19:47
How to trigger DAC from TimerCounter?
I want to use the SamvV71 DAC to generate a waveform at a specific frequency. I am using the ASF4 drivers but I can’t find a good example for the DAC.  I am setting up TC0...
Friday, 14 August 2020 - 11:44

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