TeensySdioDemo - print SD clk

SdFat/examples/TeensySdioDemo/TeensySdioDemo.ino

   Serial.print("yieldCalls   ");
   Serial.println(yieldCalls);
   Serial.print("yieldMaxUsec ");
-  Serial.println(yieldMaxUsec);  
+  Serial.println(yieldMaxUsec);
+  Serial.print("kHzSdClk     ");
+  Serial.println(sd.card()->kHzSdClk());
   Serial.println("Done");
 }
 

SdFat/src/SdCard/SdioCard.h

   uint32_t errorData();
   /** \return error line for last error. Tmp function for debug. */
   uint32_t errorLine();
+  /** \return the SD clock frequency in kHz. */
+  uint32_t kHzSdClk();
   /**
    * Read a 512 byte block from an SD card.
    *

SdFat/src/SdCard/SdioTeensy.cpp

   while ((F_CPU/(sdclkfs*dvs) > maxSdclk) && (dvs < DVS_LIMIT)) {
     dvs++;
   }
-  m_sdClkKhz = F_CPU/(sdclkfs*dvs);
+  m_sdClkKhz = F_CPU/(1000*sdclkfs*dvs);
   sdclkfs >>= 1;
   dvs--;
 
   return m_errorLine;
 }
 //-----------------------------------------------------------------------------
+uint32_t SdioCard::kHzSdClk() {
+  return m_sdClkKhz;
+}
+//-----------------------------------------------------------------------------
 bool SdioCard::readBlock(uint32_t lba, uint8_t* buf) {
   uint8_t aligned[512];