Products > Test Equipment
EEVBlog 121GW Multimeter Firmware Details
tpw_rules:
--- Quote from: Iagash on January 23, 2018, 04:20:14 pm ---Dave, could you provide us with the pinout of the jtag connector, so I could try to read out the bootloader and the option byte values with my ST-Link dongle?
--- End quote ---
I'd bet money it's ARM SWD. I don't think these smaller parts use JTAG. The pin list is in the datasheet somewhere; the meter uses the LQFP144 package. You're looking for SWCLK, SWDIO, NRST, VCC, and GND.
Edit: I know you meant the pin header on the accessible side of the board, but if you have some time this would give the answer without waiting for Dave. Be sure to add it to the wiki!
ez24:
Reading
(Interesting to see what happens with this meter and what members can do with it. My guess it is going to become a great meter because of the firmware updates :-+)
Scottjd:
So what does Dave say, “For those who want to play along at home”....
Well if the picturemin the other thread is correct the this is the data sheet.
It’s the LQFP144 package, page 35 has the pinouts.
http://www.st.com/content/ccc/resource/technical/document/datasheet/58/e3/b5/60/88/c8/4b/1b/DM00034689.pdf/files/DM00034689.pdf/jcr:content/translations/en.DM00034689.pdf
Update: I guess I shouldn’t have kept my post in draft so long, lol. I was busy reading the data sheet myself and forgot to click post.
EEVblog:
Here is the schematic which may help
David2 is working on seeing what we can provide in terms of documentation to help people who want to write their own firmware.
http://www.eevblog.com/files/121GW%20EEVBlog%20Circuit%20diagram.pdf
hwti:
--- Quote from: EEVblog on January 23, 2018, 10:59:21 pm ---Here is the schematic which may help
David2 is working on seeing what we can provide in terms of documentation to help people who want to write their own firmware.
http://www.eevblog.com/files/121GW%20EEVBlog%20Circuit%20diagram.pdf
--- End quote ---
The CN2 connector seems to be a debug interface for the BLE module.
Can the STM32 update the bluetooth firmware with the serial port ?
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