ESP-01 with 4Mbyte

Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)
 Reply

User avatar

Re: ESP-01 with 4Mbyte

By RichardS
- Fri Jul 17, 2015 10:36 am #23504 drop of water on top has worked for me, or a wet finger to add a little water to the top, and then sometimes bright light at angle and also magnification at sharp angles, you need to catch the right light :-)

Richard.
User avatar

Re: ESP-01 with 4Mbyte

By kriegste
- Sun Jul 19, 2015 8:23 am #23633 Are there really ESP-01 with 4 MBytes of flash? I looked everywhere. The best I could find was a "ESP-01E" with 1 MByte of flash.
User avatar

Re: ESP-01 with 4Mbyte

By Barnabybear
- Sun Jul 19, 2015 6:41 pm #23670 Hi, I've just recieved (18/07/15 UK date) 20 ESP8266-01 purchased on ebay from china. All are on what I would call a black board, AT+GMR returns
Code: Select allAT version:0.25.0.0(Jun  5 2015 16:27:16)
SDK version:1.1.1
Ai-Thinker Technology Co. Ltd.
Jun  5 2015 23:07:20

and the previously posted flash size check code, returns
Code: Select alltail 12
chksum 0x60
ho 0 tail 12 room 4
load 0x3ffe8000, len 1332, room 12
tail 8
chksum 0x2f
load 0x3ffe8540, len 1644, room 0
tail 12
chksum 0x68
csum 0x68
s$15863905
1327304
4096

Looks like the latest production are 4M.
On a side note, I could not flash these with the TX->RX resistor voltage divider that has worked with previously purchased boards. I had a blue flashing led on my CH340 but not on the ESP8266-01. Tried every pin configaration to no avail (had about 5 hours - nearly binned the lot - glad I didn't ).
In the end this worked
Code: Select allVCC   -> 3.3V (1A supply)
GND   ->GND (both supply & CH340)
URXD   ->TX (CH320 & yes I know thats 5V - only connected for the minimum time to flash then used 1K/2k voltage deveder for serial which works for serial but not to flash)
UTXD   ->RX (CH320)
GPIO 0   ->pulled high with a 1K resister (shorted and held to GND to enter flash mode & during flash - programme ran on completion of flash without removing the short or reseting)
GPIO 2   ->NC
RST   ->NC (yes I know it should be pulled high)
CH-PD   ->pulled high with a 1k resister (shorted momenarily to GND to enter flash mode)
Flashed with:
Arduino 1.6.5
Board: Generic ESP9266 Module
CPU Frequency: 80MHZ
Flash Size: "4M (3M SPIFFS)"
Upload Speed: "115200"
Port:  <yours>
Programmer: "AVRISP mkII"

I'm not recomending any of the above - just posting what worked for me - use at your own risk!
Last edited by Barnabybear on Mon Jul 20, 2015 7:37 am, edited 1 time in total.
 Reply
Return to Hardware Specific