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Alternative flashing methods

NOTE: When you have already flashed the stick and paired devices to it, reflashing it requires to re-pair all your devices!

Via Arduino/ESP8266

Flashing firmware via Arduino is implemented using the project https://github.com/wavesoft/CCLib But with minor improvements!!!

AndrewLinden described that he was able to flash CC2531 using CCLib with comments.

As described I made a fork of the CCLib library with minor changes for flashing firmware via Arduino:

  • Timeouts of operations
  • After opening the port (I have in Windows 7) Arduino reboots and, accordingly, does not respond to requests - made a 3 seconds pause (found somewhere in internet).
  • The port speed is reduced to 9600, because at another speed leaving communication errors: ERROR: Could not read from the serial port!

Flashing proccess:

  1. Download and unpack the archive with the library https://github.com/kirovilya/CCLib.

  2. Flashing Arduino sketch via Arduino IDE CCLib\Arduino\CCLib\Examples\CCLib_proxy\CCLib_proxy.ino

If flashing via esp8266 (wemos d1 mini), you need change connection (p. 5) and Pinout configuration in Arduino/CCLib/Examples/CCLib_proxy/CCLib_proxy.ino:

int CC_RST   = 5;
int CC_DC    = 4;
int CC_DD_I  = 14;
int CC_DD_O  = 12;

  1. Install Python 2.7 or later (tested with python 2.7.13), if not installed

  2. Install pyserial 3.0.1, if not installed pip install -r CCLib\Python\requirements.txt or pip install pyserial==3.0.1

  3. Connect the contacts as described https://github.com/kirovilya/CCLib#1-prepare-your-arduino-board But in my case, I connected completely without resistors, combined the contacts CC_DD_I and CC_DD_O together and connected to the DD pin of the DEBUG connector!

I connected only 3 specified contacts and GND. During the firmware, the stick and Arduino must be connected to the USB.

  1. After that, try to get information about the chip - if it works, then the connection is correct (example for COM9 port - Arduino port):
C:\Projects\CCLib\Python>python cc_info.py -p COM9
INFO: Found a CC2531 chip on COM9

Chip information:
      Chip ID : 0xb524
   Flash size : 256 Kb
    Page size : 2 Kb
    SRAM size : 8 Kb
          USB : Yes

Device information:
 IEEE Address : 00124b0014aa
           PC : 0000

Debug status:
 [ ] CHIP_ERASE_BUSY
 [ ] PCON_IDLE
 [X] CPU_HALTED
 [ ] PM_ACTIVE
 [ ] HALT_STATUS
 [ ] DEBUG_LOCKED
 [X] OSCILLATOR_STABLE
 [ ] STACK_OVERFLOW

Debug config:
 [ ] SOFT_POWER_MODE
 [ ] TIMERS_OFF
 [X] DMA_PAUSE
 [X] TIMER_SUSPEND

Another example of connection on MacOS

  1. If everything is successful, download the firmware. Before we flash the firmware we need to make a modification to it. Open the .hex file in a text editor and remove the second last line. Now save the file.

  2. Start the flashing firmware (it takes a long time, about 2-3 hours):

C:\Projects\ZigBee>python cc_write_flash.py -e -p COM9 --in=CC2531ZNP-Pro-Secure_LinkKeyJoin_mod.hex
INFO: Found a CC2531 chip on COM9

Chip information:
      Chip ID : 0xb524
   Flash size : 256 Kb
    Page size : 2 Kb
    SRAM size : 8 Kb
          USB : Yes
Sections in CC2531ZNP-Pro-Secure_LinkKeyJoin_mod.hex:

 Addr.    Size
-------- -------------
 0x0000   8176 B
 0x1ff6   10 B
 0x3fff0   1 B
 0x2000   239616 B

This is going to ERASE and REPROGRAM the chip. Are you sure? <y/N>:  y

Flashing:
 - Chip erase...
 - Flashing 4 memory blocks...
 -> 0x0000 : 8176 bytes
    Progress 100%... OK
 -> 0x1ff6 : 10 bytes
    Progress 100%... OK
 -> 0x3fff0 : 1 bytes
    Progress 100%... OK
 -> 0x2000 : 239616 bytes
    Progress 100%... OK

Completed

Via Arduino Uno/CCLoader

This has only been tested with a Genuine Arudino Uno (and an Arduino Pro Micro - China clone), but is significantly faster

  1. Download and unpack CCLoader firmware and tools https://github.com/RedBearLab/CCLoader

  2. Download the correct firmware, this example will be using the CC2531

  3. Unpack firmware and convert the hex-file to bin.

  4. Under Windows: (not tested by me) objcopy.exe --gap-fill 0xFF --pad-to 0x040000 -I ihex CC2531ZNP-Prod.hex -O binary CC2531ZNP-Prod.bin Place the resulting CC2531ZNP-Prod.bin in the Windows folder of CCLoader with CCLoader.exe.

    Under Linux: objcopy --gap-fill 0xFF --pad-to 0x040000 -I ihex CC2531ZNP-Prod.hex -O binary /tmp/CC2531ZNP-Prod.bin

objcopy is part of the bintools package.

  1. Flash Arudino Uno with Arduino\CCLoader\CCLoader.ino, note the COM port number/device this will be used later

  2. Connect pins as described to debug header

Arduino | CC Header
GND -> GND
4 -> DC (Debug Clock)
5 -> RESETn
6 -> DD (Debug Data)

If you have a 3.3V Arduino you can optionaly connect

3.3V -> Target Voltage Sense (Pin 2)

and programm the CC2531 without connecting the CC2531 to USB (in the next step).

  1. Connect Arduino first, then within a couple seconds connect the CC2531 to USB power

  2. Under Windows - open a command window in the Windows folder with CCLoader.exe

Under Linux you have to compile CCLoader first - so change to CCLoader/SourceCode/Linux, and run gcc main.c.

  1. Under Windows start the flash with CCLoader_x86_64.exe COMNUM CC2531ZNP-Prod.bin 0
  • Example: CCLoader_x86_64.exe 7 CC2531ZNP-Prod.bin 0

Under Linux start the flash with ./a.out USBDEV CC2531ZNP-Prod.bin 0

  • Example ./a.out /dev/ttyACM0 CC2531ZNP-Prod.bin 0

If burning fails/gets stuck at "Request sent already! Waiting for respond..." - try again, check your wiring, try using "1" instead of "0" as the last parameter.

With Raspberry

  1. Install wiringPi, if not already installed.

  2. Install flash_cc2531 :

git clone https://github.com/jmichault/flash_cc2531.git
  1. Connect the following pins of the debug port to the GPIO port :
  • pin 1 (GND) --> pin 39 (GND)
  • pin 7 (reset) --> pin 35 (GPIO24, BCM19)
  • pin 3 (DC) --> pin 36 (GPIO27, BCM16)
  • pin 4 (DD) --> pin 38 (GPIO28, BCM20)

See above for the dispositions of pins on CC2531, and at https://pinout.xyz/ for pins on Raspberry.

A downloader cable CC2531 and 4 Dupont line Female to Female are perfect for this purpose.

Now insert the usb dongle in an USB port :

  1. Test by running :
cd flash_cc2531
./cc_chipid

it should return :

  ID = b524.

If you see 0000 or ffff, something is wrong and you should probably check your wiring.

  1. Download and extract the latest firmware CC2531ZNP-Prod.hex

  2. Erase and flash the CC2531 :

./cc_erase
./cc_write CC2531ZNP-Prod.hex

It takes around 3 minutes.