ESP8266

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Facing similar issue with my ESP8266-01 with Arduino UNO R3.

I can't sent the AT command as I am getting loop of FatalException(0) as below as soon as I connect to ESP8266 module: (Can't make out what does this mean)

Fatal exception 0(IllegalInstructionCause):
epc1=0x40201364, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000 ets
Jan 8 2013,rst cause:2,
boot mode:(3,6) load 0x40100000,
len 1856,
room 16 tail 0
chksum 0x63
load 0x3ffe8000,
len 776,
room 8 tail 0
chksum 0x02
load 0x3ffe8310,
len 552,
room 8 tail 0
chksum 0x79
csum 0x79
2nd boot version : 1.5
SPI Speed : 40MHz
SPI Mode : DIO
SPI Flash Size & Map: 8Mbit(512KB+512KB)
jump to run
user1 @ 1000

Following are my ESP8266 connection details:

  1. Vcc - 3.3v external supply (GND connected to GND of 3.3v and GND of 5v of Arduino)
  2. CH_PD - 3.3v
  3. GPIO0 - Tried keeping 3.3v (Same Error)
    disconnected (Same Error)
    GND (Same Error)--(Just tried. I know this will be the programming mode)
  4. Rx - Rx of Arduino UNO via voltage divider
  5. Tx - Tx of Arduino
    (Tried with exchanging Rx and TX)
  6. RST - Disconnected (Same Error)
    3.3v (Same Error)
    (Used the GND pulse to reset the ESP8266)

I also tried connecting RESET of Arduino UNO to GND with no success ;( .

I checked the output with all the baud rates keeping "Both NL & CR" option selected. For baud rate 115200 I am getting the above exception. For rest it showing some garbage values.

I have uploaded bareMinimum example in the Arduino UNO to start with.

Any suggestion, pointer will be really appreciated.

Is my module damaged? Never used it with anything other than 3.3v though.

Thanks.