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SAMD21 SERCOM SPI, which pin can one use for SS slave select?
I want to use a SAMD21 as SPI master with software control of the SS slave select signal (CTRLB.MSSEN = 0) One can configure which PADs of the SERCOM peripheral are used for...
Wednesday, 17 July 2019 - 20:08
SAMD21 variant D or L board
Does anyone know of a breakout board with the newer SAMD21 variants D and L  processors? These have an fourth TCC which is the same as the existing 24-bit TCC0, could...
Wednesday, 20 March 2019 - 16:40
SAMD21 GCLK->CLKCTRL.CLKEN not getting set
What am I doing wrong? After running the code below the value of GCLK->CLKCTRL.CLKEN is not 1 for for all peripherals int main(void) { /* Store the value of CLKEN for each...
Wednesday, 13 February 2019 - 22:05
SAMD21 How to unstop a TC
In order to change the TC->EVCTRL.EVACT value one has to disable the TC. As a result the STATUS.STOP bit is set. This is supposed to be cleared when one writes a RETRIGGER...
Tuesday, 22 January 2019 - 21:54
Can't get TCC0 or TCC1 to start counting
I've been fighting for some time to persuade TCC and TCC1 to start timing. The board is a Sparkfun SAMD21 breakout with a SAMD21G18A Two TCs using the same GCLK as generator...
Tuesday, 8 January 2019 - 20:24
SAMD21 GCLK->CLKCTRL.CLKEN not getting set
I reported a similar problem some time ago, but never got an answer which made it work The device is a SAMD21G21A in a Sparkfun breakout board GCLK2 GENDIV and GENCTRL is set up...
Monday, 29 October 2018 - 21:20
Retrigger event input action fro SAMD21 TC or TCC
Perhaps a dumb question, but the SAMD21 datasheet isn't clear (to me) What does the event action RETRIGGER do when an event is received and the counter is running. Does it only...
Monday, 29 October 2018 - 18:53
AS 7 could not find Clarius..., could not load Fdk.Project
On clicking Tools->Extensions and updates... in AS 7.0.131 on a 64-bit Win 10 notebook the error message appears: "Could not load file or assembly Clarius.DevStore.Client....
Thursday, 9 August 2018 - 18:29
Atmel Studio 7 I/O display of SERCOM while debugging
How does one report a bug or suggest an improvement to Atmel Studio? While debugging SAMD21 SERCOM code open the I/O window and expand the relevant SERCOM device. This shows: The...
Wednesday, 6 June 2018 - 10:50
SAMD21 event channel path question
The datasheet is very vague about event channel paths. In the description of EVSYS->CHANNEL.PATH on p. 372 it says "The path choice can be limited by the channel source". It...
Sunday, 13 May 2018 - 20:30
SAMD21 spurious TC overflow and match/capture events
In the SAMD21 datasheet http://ww1.microchip.com/downloads/en/DeviceDoc/40001882A.pdf#page=873 section 4.1.1.11 it mentions that there can be spurious TC overflow...
Tuesday, 8 May 2018 - 19:32
HM-11 Bluetooth module, no USART response after baud rate change
When switched on the module responds to the AT, AT+BAUD? commands, the baud rate is 9600, 8N1 If I try to change the baud rate to 38400 with the AT+BAUD2 command and change the RX...
Thursday, 22 March 2018 - 16:57

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