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We'll use the ESP built-in support instead of the printf library. Some lambda trickery is required to get the library working with the built-in ets_vprintf, since they only provide a callback and no private data.
fri-K
reviewed
Nov 30, 2020
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| va_list va; | ||
| va_start(va, format); | ||
| ets_vprintf(callback, format, va); |
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This line would cause compilation error if in ets_sys.h function declaration is as follows:
int ets_vprintf(int (*print_function)(int), const char * format, va_list arg) __attribute__ ((format (printf, 2, 0)));
and this is the case for ArduCAM ESP8266 UNO
error:
arduino-logger/src/ArduinoLogger.h:293:35: error: invalid conversion from 'void (*)(char)' to 'int (*)(int)' [-fpermissive] ets_vprintf(callback, format, va); ^
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