diff --git a/cores/esp32/esp32-hal-i2c.c b/cores/esp32/esp32-hal-i2c.c
index 4d008c0fde7..ba9afd26f9c 100644
--- a/cores/esp32/esp32-hal-i2c.c
+++ b/cores/esp32/esp32-hal-i2c.c
@@ -379,8 +379,8 @@ void i2cInitFix(i2c_t * i2c){
     while ((!i2c->dev->command[2].done) && (--count > 0));
     I2C_MUTEX_UNLOCK();
 }
-/* 
- unused 03/15/2018
+*/
+/* unused 03/15/2018
 void i2cReset(i2c_t* i2c){
     if(i2c == NULL){
         return;
@@ -622,7 +622,7 @@ while(a<i2c->queueCount){
   a++;
   }
 #else
-log_n("Enable Core Debug Level \"Error\"");
+//log_n("Enable Core Debug Level \"Error\"");  //blup
 #endif
 }
  
@@ -971,7 +971,7 @@ for(uint32_t a=1;a<=INTBUFFMAX;a++){
   if(intBuff[b][0][num]!=0) log_e("[%02d] 0x%04x 0x%04x 0x%04x 0x%04x 0x%08x",b,((intBuff[b][0][num]>>16)&0xFFFF),(intBuff[b][0][num]&0xFFFF),((intBuff[b][1][num]>>16)&0xFFFF),(intBuff[b][1][num]&0xFFFF),intBuff[b][2][num]);
   }
 #else
-log_n("enable Core Debug Level \"Error\"");
+//log_n("enable Core Debug Level \"Error\""); //blup
 #endif
 }
  
@@ -1026,8 +1026,7 @@ if(!i2c->i2c_event){
   i2c->i2c_event = xEventGroupCreate();
   }
 if(i2c->i2c_event) {
-  uint32_t ret=xEventGroupClearBits(i2c->i2c_event, 0xFF);
-  if(ret != ESP_OK) log_e("Unable to Clear Event Bits=%d",ret);
+  xEventGroupClearBits(i2c->i2c_event, 0xFF);
   }
 else {// failed to create EventGroup
   log_e("eventCreate failed=%p",i2c->i2c_event);
@@ -1105,7 +1104,7 @@ i2c->dev->int_ena.val =
 
 if(!i2c->intr_handle){ // create ISR for either peripheral 
  // log_i("create ISR %d",i2c->num);
-  uint32_t ret=0xFFFFFFFF; // clear uninitialized var warning
+  uint32_t ret = ESP_FAIL;
   switch(i2c->num){
     case 0:
       ret = esp_intr_alloc(ETS_I2C_EXT0_INTR_SOURCE, 0, &i2c_isr_handler_default, i2c, &i2c->intr_handle);
@@ -1155,7 +1154,7 @@ if(!(eBits==EVENT_DONE)&&(eBits&~(EVENT_ERROR_NAK|EVENT_ERROR_DATA_NAK|EVENT_ERR
   i2cDumpI2c(i2c);
   i2cDumpInts(i2c->num);
 #else
-  log_n("I2C exitCode=0x%x",eBits);
+  //log_n("I2C exitCode=0x%x",eBits); //blup
 #endif
   }
 
diff --git a/cores/esp32/esp32-hal-i2c.h b/cores/esp32/esp32-hal-i2c.h
index 453473e5844..17c2dff923e 100644
--- a/cores/esp32/esp32-hal-i2c.h
+++ b/cores/esp32/esp32-hal-i2c.h
@@ -168,6 +168,7 @@ i2c_err_t i2cProcQueue(i2c_t *i2c, uint32_t *readCount, uint16_t timeOutMillis);
 i2c_err_t i2cAddQueueWrite(i2c_t *i2c, uint16_t i2cDeviceAddr, uint8_t *dataPtr, uint16_t dataLen, bool SendStop, EventGroupHandle_t event);
 i2c_err_t i2cAddQueueRead(i2c_t *i2c, uint16_t i2cDeviceAddr, uint8_t *dataPtr, uint16_t dataLen, bool SendStop, EventGroupHandle_t event);
 i2c_err_t i2cFreeQueue(i2c_t *i2c);
+void i2cReleaseISR(i2c_t * i2c);
 void i2cReleaseAll(i2c_t *i2c); // free ISR, Free DQ, Power off peripheral clock.  Must call i2cInit(),i2cSetFrequency() to recover
 //stickbreaker debug support
 void i2cDumpInts(uint8_t num);
diff --git a/libraries/SD_MMC/src/SD_MMC.cpp b/libraries/SD_MMC/src/SD_MMC.cpp
index 104769693ad..9c27544a8ac 100644
--- a/libraries/SD_MMC/src/SD_MMC.cpp
+++ b/libraries/SD_MMC/src/SD_MMC.cpp
@@ -42,8 +42,19 @@ bool SDMMCFS::begin(const char * mountpoint, bool mode1bit)
     }
     //mount
     sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
-    sdmmc_host_t host = SDMMC_HOST_DEFAULT();
+    // sdmmc_host_t host = SDMMC_HOST_DEFAULT();
+    // host.max_freq_khz = SDMMC_FREQ_HIGHSPEED;
+    sdmmc_host_t host;
+    host.flags = SDMMC_HOST_FLAG_4BIT;
+    host.slot = SDMMC_HOST_SLOT_1;
     host.max_freq_khz = SDMMC_FREQ_HIGHSPEED;
+    host.io_voltage = 3.3f;
+    host.init = &sdmmc_host_init;
+    host.set_bus_width = &sdmmc_host_set_bus_width;
+    host.set_card_clk = &sdmmc_host_set_card_clk;
+    host.do_transaction = &sdmmc_host_do_transaction;
+    host.deinit = &sdmmc_host_deinit;
+    host.command_timeout_ms = 0;
 #ifdef BOARD_HAS_1BIT_SDMMC
     mode1bit = true;
 #endif