_rtl_sprintf: format not support!

[bkrajendra]

I am using a simple sprintf in my code.

sprintf(path, "/input/post?node=%s&json={humidity:'%2.1f',temp: '%2.1f'}', 'apikey':%s}", cid, h, t, api_key);

what could be wrong here.?

[xidameng]

Hi @bkrajendra ,

Thanks for your feedback, Ameba D by default uses custom sprintf implementation in its ROM, thus it doesn't support all format specifier such as %lf etc. This is so to save memory and prevent malicious attacks targetting RAM.

However, this SDK also supports standard lib implementation, we will add a easy-to-use option in the Arduino IDE drop down menu later, but for now, you can follow my steps below to fix your issue,

1. Locate the Arduino.h file on your PC, for my case, the path looks like this if you are using the Latest Version,

%USERPROFILE%\AppData\Local\Arduino15\packages\realtek\hardware\AmebaD\3.1.4\cores\ambd

2. Uncomment the macro Arduino_STD_PRINTF and add another macro

Nagivate to line 30, and uncomment this line, then add #define STD_PRINTF in the line above

[xidameng]

This issue is fixed in PR #136 , proceed to close the issue