SAMR21: UART0 can only transmit two bytes to the PC

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zongyan
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Joined: Mon. Aug 14, 2017
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Posted by zongyan: Fri. Aug 24, 2018 - 07:27 PM
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I use UART0 to transmit a string to the PC. However, at the PC, only two bytes of the beginning of string can be read. 

 

can anyone advise me how to fix this problem?

 

Thank you!

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Tools, Evaluation and Development Kits (ARM-related)
Last Edited: Fri. Aug 24, 2018 - 07:34 PM
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Bronze Markawneil
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Joined: Fri. Jul 1, 2005
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Location: Basingstoke, Hampshire, UK
Posted by awneil: Sat. Aug 25, 2018 - 10:42 AM
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zongyan wrote:
can anyone advise me how to fix this problem?

Not from the very scant information you've provided!

 

  • How do you know that >2 characters are actually being transmitted?
  • How are you receivign & viewing the characters on the PC?
  • etc, etc ?

 

Learn to debug: https://www.avrfreaks.net/commen...

 

 

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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