This is a compact WiFi module with a powerful ARM CPU.

By default, this module runs an O/S called MICO.

Whilst this module is relatively inexpensive, the development tools for the MICO O/S cost thousands. This makes the device practically useless for now.

     PB0                    PB1
     GREEN LED              RED LED
             
     GND NC NC PC4 PC3 PB14 PA8 PA6 PA5
      39 38 37 36  35  34   33  32  31
PB6  1                                30 PB9
PB7  2           STM32F205RG          29 PA0-WKUP
PA13 3                                28 PA14
PC7  4                                27 BOOT0
PA3  5                                26 NC
PA4  6                                25 GND
PB3  7                                24 VDD-3V3
PB4  8     D0                         23 PA10 RX
PB5  9     D1                         22 PA9  TX
PB8  10    D2                         21 PA11
PA1  11    D3                         20 PA12
PC2  12    CLK                        19 PB11
PB14 13    CMD                        18 PA15
PC6  14    3V3                        17 NRST
GND  15    GND                        16 PB1
GND  40           ANTENNA
GND  41
       42 43  44
      GND GND GND
      
MICO            ISP
====            ===
STATUS   PB9    TX       PA10 RX
BOOT     PB1    RX       PA9  TX
EASYLINK PB8    3V3 220R BOOT0

SWD             JTAG
===             ====
SWCLK PA14      TCK  PA14
SWDIO PA13      TMS  PA13
NRST  NRST      TRST PB4
                TDI  PA15
                TDO  PB3

stm32flash -b 9600 /dev/ttyCP2102
stm32flash 0.4

http://stm32flash.googlecode.com/

Interface serial_posix: 9600 8E1
Version      : 0x31
Option 1     : 0x00
Option 2     : 0x00
Device ID    : 0x0411 (STM32F2xx)
- RAM        : 128KiB  (8192b reserved by bootloader)
- Flash      : 1024KiB (sector size: 4x16384)
- Option RAM : 16b
- System RAM : 29KiB

The bootloader is entered by holding PB1 low and PB9 high.

BOOT   PB1    GND
STATUS PB9 1K 3V3

+***************(C) COPYRIGHT 2012 MXCHIP corporation************+
|               EMW316x Common Bootloader   (Version 4.0.1_WDG)  |
+ command ----------------+ function ----_-----------------------+
| 1:FWUPDATE <-a>    | update the firmware from UART using Ymodem|
| 2:FWERASE          | erase the current firmware and settings   |
| 3:BOOT             | excute the current firmware               |
| 4:REBOOT           | Reboot                                    |
| ?:HELP             | displays this help                        |
+--------------------+-------------------------------------------+
|                           By William Xu from MXCHIP M2M Team   |
+----------------------------------------------------------------+

MXCHIP> 

Minicom may be used to send a file using the ymodem protocol.

The firmware file must be compatible with the currently installed MICO O/S.

MXCHIP>
1
Waiting for the file to be sent ... (press 'a' to abort)
CCC
+-----------[ymodem upload - Press CTRL-C to quit]------------+
|Sending: WiFiLink.bin                                        |
|Bytes Sent: 194856   BPS:8683                                |
|Sending:                                                     |
|Ymodem sectors/kbytes sent:   0/ 0k                          |
|Transfer complete                                            |
|                                                             |
| READY: press any key to continue...                         |
+-------------------------------------------------------------+ 
MXCHIP>
mxchipWNet Demo: Wi-Fi Link
mxchipWNet library version: 31620001.027
Start scan
connect to MXCHIP_RD....., return -1
Setup soft AP: Soft AP test, return 0
uAP up
Soft AP mode: IP address: 192.168.0.1
Soft AP mode: NetMask address: 255.255.255.0
Soft AP mode: MAC address: c893464272f9

Install OpenCM3.

Install STM32Flash.

Enter ST ISP mode using BOOT0, RX and TX as shown in the pinout above.

Fetch the demo and edit the Makefile, change the serial device to your host device (TTYISP).

hg clone http://hg.kewl.org/pub/miniblink-emw
cd miniblink-emw
vi Makefile

Now, backup the chip, load standalone demo and run it.

make backup
make stm32flash

You can restore the MICO O/S from the emw3162.bin file, do not overwrite it.
Eg.

stm32flash -w emw3162.bin -b 115200 /dev/ttyAMA0