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Serial.println(String(0.3f)) outputs nothing #10

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pablosun opened this issue May 12, 2017 · 1 comment
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Serial.println(String(0.3f)) outputs nothing #10

pablosun opened this issue May 12, 2017 · 1 comment
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pablosun commented May 12, 2017 •
edited 

Serial.println(0.3f);  // OK, output "0.30"
Serial.println(String(0.3f)); // NG, output ""

Reference: https://labs.mediatek.com/en/faq/FAQ18719
@pablosun pablosun added the bug label May 12, 2017
@pablosun pablosun self-assigned this May 12, 2017
pablosun added a commit that referenced this issue May 12, 2017
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#10: Add floating point printf support
8f299f2 
Fix `Serial.print(1.3f)` results in empty output issue by adding `-u _printf_flat` in `ldfalgs`.
@pablosun pablosun changed the title Serial.println(0.3f) outputs nothing Serial.println(String(0.3f)) outputs nothing May 12, 2017
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Note that Stream::print implement its own floating-point output implementation, while String(float) redirects the call to dtostrf and then vsprintf. So a quick solution is to add the floating point support to the printf library.

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