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JunTek PSG9080 Programmable Signal Generator (80 MHz - 300 MSa/s - 14-bit)

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radiolistener:

--- Quote from: fjalvingh on June 30, 2021, 01:07:15 pm ---Can you tell me what you found? Because I could not really connect the pinout with the assumed stm32f103rct6. The pins I traced do not seem to go to jtag pins.

--- End quote ---

I didn't save my results, but as I remember this connector has +3.3V, GND, SWDIO, SWCLK and RESET. I trace it with DMM on STM32 pins, but I don't remember exact pin description. 3.3V and GND you can easily find. SWDIO and SWCLK can be traced with DMM.

fjalvingh:

--- Quote from: radiolistener on June 30, 2021, 03:15:31 pm ---I didn't save my results, but as I remember this connector has +3.3V, GND, SWDIO, SWCLK and RESET. I trace it with DMM on STM32 pins, but I don't remember exact pin description. 3.3V and GND you can easily find. SWDIO and SWCLK can be traced with DMM.

--- End quote ---
Well, I could not link any of the pins to any reasonable function on the STM32. My crystal goes to pins 7 and 8 (assuming the 1-16 pin row is oriented downwards. The pins on the header go to:
1 goes to 53 (pc12)
2 goes to 52 (pc11)
3 goes to 49 (pa14) EN 48 (Vdd)
4 goes to the bottom, around pin 24, 25
5 goes to 50 (pa15)
6 goes to 51
7 is Vcc +3.3V
8 is GND

With the exception of the power lines all of this seems nonsense. But then I looked up your teardown images and lo and behold: I think I have a different version. My board looks like the image attached. The chip's markings have been erased, but clearly the pinout is quite different.

So, I fear I need to go on the hunt for what chip this is before I can do anything....


TheBay:
That display ribbon isn't soldered on there properly  :--, are the connections at the top even connected to the PCB?
I guess they must have hand soldered that part in production.


--- Quote from: fjalvingh on June 30, 2021, 07:44:20 pm ---
--- Quote from: radiolistener on June 30, 2021, 03:15:31 pm ---I didn't save my results, but as I remember this connector has +3.3V, GND, SWDIO, SWCLK and RESET. I trace it with DMM on STM32 pins, but I don't remember exact pin description. 3.3V and GND you can easily find. SWDIO and SWCLK can be traced with DMM.

--- End quote ---
Well, I could not link any of the pins to any reasonable function on the STM32. My crystal goes to pins 7 and 8 (assuming the 1-16 pin row is oriented downwards. The pins on the header go to:
1 goes to 53 (pc12)
2 goes to 52 (pc11)
3 goes to 49 (pa14) EN 48 (Vdd)
4 goes to the bottom, around pin 24, 25
5 goes to 50 (pa15)
6 goes to 51
7 is Vcc +3.3V
8 is GND

With the exception of the power lines all of this seems nonsense. But then I looked up your teardown images and lo and behold: I think I have a different version. My board looks like the image attached. The chip's markings have been erased, but clearly the pinout is quite different.

So, I fear I need to go on the hunt for what chip this is before I can do anything....

--- End quote ---

fjalvingh:
Ok, perhaps this rings a bell for someone?
The pin 1 marker seems to be in the top left. In that case I have found the following pin assignments:
pin 1: 3.3v
pin 16: 3.3v
pin 23, 24: XTAL/Oscillator
pin 32: ground

and of course the 8 pin pin header on top, pins numbered from 1 to 8 from left to right:
1 goes to 53 (pc12)
2 goes to 52 (pc11)
3 goes to 49 (pa14) EN 48 (Vdd)
4 goes to the bottom, around pin 24, 25
5 goes to 50 (pa15)
6 goes to 51
7 is Vcc +3.3V
8 is GND

So far I found no controller family with something resembling these connections..

radiolistener:

--- Quote from: fjalvingh on June 30, 2021, 07:44:20 pm ---Well, I could not link any of the pins to any reasonable function on the STM32. My crystal goes to pins 7 and 8 (assuming the 1-16 pin row is oriented downwards. The pins on the header go to:
1 goes to 53 (pc12)
2 goes to 52 (pc11)
3 goes to 49 (pa14) EN 48 (Vdd)
4 goes to the bottom, around pin 24, 25
5 goes to 50 (pa15)
6 goes to 51
7 is Vcc +3.3V
8 is GND

With the exception of the power lines all of this seems nonsense. But then I looked up your teardown images and lo and behold: I think I have a different version. My board looks like the image attached. The chip's markings have been erased, but clearly the pinout is quite different.

--- End quote ---

wow, your PCB is really different than my one. My one has different JTAG connector.

So there are different front panel PCB exists. And it may be the reason why firmware update was failed.

I suspect that your PCB may use different microcontroller... it may be some kind of Chinese microcontroller


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