proposal to i2c

see 
talk: espressif#1061
PR on origin master : espressif#1073

Author: ESP32DE

cores/esp32/esp32-hal-i2c.c

@@ -175,7 +175,9 @@ i2c_err_t i2cAttachSCL(i2c_t * i2c, int8_t scl)
     if(i2c == NULL){
         return I2C_ERROR_DEV;
     }
+    // digitalWrite(scl, HIGH); // optional before
     pinMode(scl, OUTPUT_OPEN_DRAIN | PULLUP);
+    digitalWrite(scl, HIGH); // tested
     pinMatrixOutAttach(scl, I2C_SCL_IDX(i2c->num), false, false);
     pinMatrixInAttach(scl, I2C_SCL_IDX(i2c->num), false);
     return I2C_ERROR_OK;
@@ -197,7 +199,9 @@ i2c_err_t i2cAttachSDA(i2c_t * i2c, int8_t sda)
     if(i2c == NULL){
         return I2C_ERROR_DEV;
     }
+    // digitalWrite(sda, HIGH); // optional before
     pinMode(sda, OUTPUT_OPEN_DRAIN | PULLUP);
+    digitalWrite(sda, HIGH); // tested
     pinMatrixOutAttach(sda, I2C_SDA_IDX(i2c->num), false, false);
     pinMatrixInAttach(sda, I2C_SDA_IDX(i2c->num), false);
     return I2C_ERROR_OK;