many many small changes

switched to the new logging here and there
some cleanups
worked  on i2S
base class for files
id3 parsing

ext/sd/SDCard.h

@@ -77,7 +77,7 @@ public:
 		for (uint8_t i = 0; ; ++i) {
 			const R1 res = cmd0();
 			if (res.raw == 1) {break;}
-			if (i == 4) {Log::addError(NAME, "init failed"); return false;}
+			if (i == 8) {Log::addError(NAME, "init failed"); return false;}
 			delay(50);
 		}
 		
@@ -309,7 +309,7 @@ private:
 		// NOTE: it is IMPORTANT to send 0xFF to the card while reading its responses!
 		
 		// wait for the first byte to arrive and read it
-		for (uint8_t i = 0; i < 8; ++i) {
+		for (uint8_t i = 0; i < 32; ++i) {
 			dst[0] = spi.readWriteByte(0xFF);
 			if ( (dst[0] & 0x80) == 0 ) {break;}
 		}
@@ -328,6 +328,8 @@ private:
 	/** most simple read operation: read a single block of 512 bytes, addr = byteAddr/512 */
 	bool readSingleBlock(LBA512 addr, uint8_t* dst) {
 
+		//spi.setSlowdown(0);
+
 		sendCMD(17, addr>>24, addr>>16, addr>>8, addr>>0, 0xFF);
 		R1 res; readResponse(&res.raw, 1);
 
@@ -341,7 +343,7 @@ private:
 			uint8_t res = spi.readWriteByte(0xFF);
 			if (res == 0xFE)	{break;}												// available!
 			if (res != 0xFF)	{Log::addError(NAME, "invalid"); endCMD(); return false;}	// invalid response
-			if (i > 1024)		{Log::addError(NAME, "timeout"); endCMD(); return false;}	// timeout
+			if (i > 32768)		{Log::addError(NAME, "timeout"); endCMD(); return false;}	// timeout
 		}
 
 		// read data
@@ -349,6 +351,8 @@ private:
 			dst[i] = spi.readWriteByte(0xFF);
 		}
 
+		//spi.setSlowdown(128);
+
 		// done
 		endCMD();
 		return true;