When I upload any sketch to this SAMD21 mcc I get the error message as shown next:
The sketch is a fresh out-of-the-box Blink example. As seen I have the correct board and port selected.
One odd thing is that the yellow LED blinks continuously and may have an uploaded blink sketch that I uploaded previously. If that is true then why can I not upload to the MCU again? I have shorted out the RST pins but that has no affect.
Thanks.
Update!
I have finally resolved this upload issue:
1 - The SAMD21 WIKI notes the following:
While this is the solution, I have discovered that this is a bit tricky in that ‘flicker’ can be difficult to decipher. As noted above I think I had previously (successfully) uploaded a Blink sketch because the yellow LED was in fact ‘blinking’ and perhaps not ‘flickering’;
2 - Patience helps because shorting the RST pins can be a bit frustrating. Finding the correct ‘tool’ to short the pins helps. Here is my rudimentary tool that gets the job done:
3 - Lastly it takes a bit of practice but the reward of being able to successfully upload your code to the SAMD21 is well worth the effort and time invested.
IMO - each of the SEEED MCU’s are amazing in every way. I have a tray of each of these SEEED MCU’s and am always astonished at what such a small MCU can do.
Thanks.
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