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SD: Implement readBytes (#4931)

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This speeds up the ESP8266WebServer::streamFile more than 3 times. Tested on streaming the 800+ Kb file from SD (FAT32), average time without a fix was 9000 ms, with the fix is 2600 ms (maximal possible SPI speed used), which is as fast as streaming the same file from internal SPIFFS. Hardware: WeMos D1 mini.
This commit is contained in:
Konstantin Ryabinin
2018-10-06 01:44:55 +05:00
committed by Earle F. Philhower, III
parent 9c46a81fb6
commit 9bc8ea1b58
2 changed files with 6 additions and 0 deletions
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libraries/SD/src/SD.h
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@ -34,6 +34,7 @@ public:
virtual size_t write(uint8_t);
virtual size_t write(const uint8_t *buf, size_t size);
virtual int read();
virtual size_t readBytes(char *buffer, size_t length);
virtual int peek();
virtual int available();
virtual void flush();