STM8L052C6 Can't downlink program

[Omkar Teli]

Posted on February 08, 2018 at 15:57

Hi,

   I designed PCB for STM8L052C6 and programming using ST-LINK V2 mini. I am using 3.3v GND SWIM NRST pins but is not programming. I have selected STM8L052C6 in STVP and Selected STM8L052C6 compatible compiled file. Still i am getting problem. I am directly using these four pins with ST_LINK V2. Kindly help me to solve the issue. Thanks in advance..

#cant-download-program-in-flash

[Szymon PANECKI]

Posted on February 08, 2018 at 16:27

Hello Omkar,

Can you show your schematics with MCU?

You can also make a cross check with schematics of my board with STM8L052C6. I attach it below.

Regards

Szymon

[Omkar Teli]

Posted on February 09, 2018 at 06:06

I added capacitor as you did and tested now but not worked out, i am sharing my schematic

i kept 2 pads for SWIM and NRST and directly soldering there wire for programing. Default status of SWIM and NRST is 0.02 V. I am using ST-LINK V2 for programming.

[Szymon PANECKI]

Posted on February 09, 2018 at 09:34

Hello Omkar,

Thanks for sharing the schematics. I made a review of it. Please find below my feedback:

Positive supply pins

VDDx, VDDA, VREF+, VLCD: connections are ok (3.3V)

Negative supply pins

VSSx, VSSA, VREF-: connections are ok (ground)

Capacitors

100nF capacitor between NRST/PA1 pin and ground is missing100nF capacitor between VDD1 pin and ground is missing100nF + 1uF capacitors between VDDA/VREF+ pins and ground are missing100nF capacitor between VDD2 and ground is missingC24 has unknown value. It should be 1uF.

Debug interface

From the schematics it seems that connection is ok: you use PA1/NRST as PAD1, ground as PAD2, SWIM as PAD3 and 3.3V as PAD4. Attaching these four wire directly to ST-Link should allow to connect to the MCU.

Please add all missing capacitors and try again. I didn't find any other problem on your schematics.

You mentioned that you measure 0.02V on 

SWIM and NRST pins. This is strange, because NRST pin has internal pull-up resistor and you should measure there value around VDD, so 3.3V in your case. Please make sure that supply voltage is attached to MCU.

Regards

Szymon

[Omkar Teli]

Posted on February 09, 2018 at 16:08

Hi,

It worked, Thanks a lot. Then i try to make changes. I used just 11 and 12 pins short and 100nf, 9 pin gnd, 1 pin swim. It programmed. It worked out but not on my PCB still finding problem. I will let you know when i will find it. Thanks for it.