Fix I2CEEBlockDevice read()

When reading a data block, the returned error codes from the I2C subsystem
are different from normal single byte operations. We have to verify that
the read-function for multiple bytes does return zero, because it
returns "readBytes != expectedLength".

Additionally, sync before trying to read from the eeprom as slow devices
may not yet be ready to return data, especially with low-priced ones
used with fast controllers.

Author: boomer41

components/storage/blockdevice/COMPONENT_I2CEE/I2CEEBlockDevice.cpp

@@ -68,7 +68,9 @@ int I2CEEBlockDevice::read(void *buffer, bd_addr_t addr, bd_size_t size)
 
     _i2c->stop();
 
-    if (_i2c->read(_i2c_addr, static_cast<char *>(buffer), size) < 0) {
+    _sync();
+
+    if (0 != _i2c->read(_i2c_addr, static_cast<char *>(buffer), size)) {
         return BD_ERROR_DEVICE_ERROR;
     }