I want to send the float-type-data on BufferedSerial with sprintf,but found the mistake parasing “%f”.How can I solve the problem ?Is it a bug in mbed? Can I choose another method to do the same job?
WHY ? 
Hello,
I do not know how familiar you are with Mbed but it is not a bug. It is default settings because of memory footprint and for change this you need to read this - mbed-os/platform/source/minimal-printf at 869f0d708aa5ead2583016a245ffa6d569031032 · ARMmbed/mbed-os (github.com)
BR, Jan
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I am definately new to mbed 
,the doc really helps a lot,thanks