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SAMD21 double interrupt after deep sleep
The end goal is to have a 1 mibisecond (1/1024) tick when awake, and then to sleep for 10-20 seconds.  We are using the RTC connected to a 32 kHz external oscillator for...
Friday, 10 May 2019 - 17:19
Set pulldown on sama5d36 input pin in dts file
I am trying to change several pins from pull up to pull down by doing the following in the dts file:   ahb { apb { ... pinctrl@fffff200 { board...
Monday, 12 February 2018 - 22:44
DFLL gives 46.9 MHz instead of 47.9 MHz
My samd21g18a board is outputting 46.9 MHz instead of 47.9 MHz when I use DFLL with XOSC32K as the source.  I tried to match my settings to those found in Table 37-51 of the...
Tuesday, 23 January 2018 - 01:40
GCLK->GENCTRL and structure initialization
To setup a generic clock generator one can do the following (for example set the external 32 kHz on generator 1): GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN |...
Wednesday, 3 January 2018 - 23:11
samd21 PLL vs DFLL
In my application my samd21 is in standby sleep most of the time, only waking up to perform some operation and then go right back to sleep.  I currently have my clock...
Monday, 6 November 2017 - 22:59
standby wake from UART causes inability to program board
Anyone had issues getting the samd21 to wake from sleep via UART?  What I am experiencing is that the wake is a little buggy and results in strange print output or the board...
Thursday, 12 October 2017 - 19:27
samd21 fuse settings causing programming failure
As I have been experimenting with the samd21 I have noticed that on occasion openocd combined with the at91samd commands would cause the samd21 to go into a state where I could no...
Monday, 8 May 2017 - 21:00
samd21 bootloader, application section and openocd
Working on a bootloader for the samd21.  Following the ASF and other examples I have setup a simple test program that turns on the LED and then jumps to application memory...
Friday, 28 April 2017 - 21:57
SAMD21 Non-ASF/SAM-BA firmware starting place
I am going to start working on firmware for my SAMD21 custom board and was curious if there are any good recommendations for places to start?  I am not interested in Atmel's...
Monday, 17 April 2017 - 21:37
samd21 pwm with waveform output 1 instead of 0
I am using a samd21g18a and I have the following working pwm: PORT->Group[0].DIRSET.reg = PORT_PA04; PORT->Group[0].OUTCLR.reg = PORT_PA04; PORT->Group[0].PINCFG[4]....
Friday, 14 April 2017 - 03:21
xmega256a3u RTC divide external oscillator by 32 cold issue
We have a design that uses the xmega256a3u and a 32.768 kHz external oscillator.  What we have noticed is that on about 10% of the chips if you use the RTC divide by 32 to...
Monday, 13 February 2017 - 19:01
SAMD21 TC sync fixes short sleep?
I am using SAMD21g18a with FreeRTOS in tickless mode.  After much assistance (https://community.atmel.com/forum/samd21-timercounter-callback-jitter-when-reading-multiple-tc-...
Friday, 6 January 2017 - 15:14

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