STM32F745TI6 prototype problem SWD not connecting.

[ksale.1]

Hi,

This was part of another (unrelated) thread which did not get timely attention.

Prototype sketch:

Cube programmer screenshot:

CubeMX ioc file attached.

The PCB manufacturer allows window of one week to submit a modified prototype within the same quotation. Please note I'm software developer new to hardware design.

BR

[Terrance Parker]

Have not looked at your schematic. However, try using the older version of CubeProgrammer, STSW-LINK004 and see if that connects. If not, you probably have board error.

https://www.st.com/en/development-tools/stsw-link004.html

[ksale.1]

Hi,

Thank you @Terrance Parker​ , it still persists

[Tesla DeLorean]

I don't expect the IOC file is going to shed much light on this.

H7 not F7 per title I'm assuming.

Dead-in-the-water tends to suggest power issues.

Check voltage present on NRST and VCAP pins, along with VDD, VDDA

Check part orientation.

Check net-list for floating/disconnected power/ground islands, or mismatched net names.

With BOOT0 high cycle the power on the whole board several times, and then attempt to connect with ST-LINK.

Any other signs-of-life?

Does USB connectivity work with BOOT0 HIGH, what about UART1 reponsiveness to 0x7F data pattern at 9600 8E1 ?

[JNguyen]

From your schematics, it seems that you are using "SMPS supplies LDO (No External supply)", correct? if so, make sure "System supply configurations" is set for the same.

[JNguyen]

correction: ... if so, make sure "System supply configurations" is set for the same in CubeMX.

[ksale.1]

Hi @Community member​ 

It is H7., VCP,VDD,VDDA, NRST are 3.3v

"Check net-list for floating/disconnected power/ground islands, or mismatched net names..."

Do you mean in the schematics?

'With BOOT0 high cycle the power on the whole board ...' How do I do that?

USB power is not working in all cases. 3.3v is sourced externally through board pins.

[ksale.1]

Thank you @Community member​ 

How do you do that in CubeMX? Which category?

[Tesla DeLorean]

No, a net-list is a connectivity list exported by the schematic tool, and used the PCB tool, and usually part of the DRC (Design Rules Check), describing all the net names, and the points/nodes to which they connect.

For example your GND Triangle symbols, some have GND label in TEAL, others don't. There should be a single "GND" net in the net-list, not one call "GND" and another called "UNK". Inconsistency often leads to multiple nets which lack the connectivity that is expected.

https://resources.altium.com/p/understanding-your-pcb-netlist

[ksale.1]

@Community member​  Thank you for the advise.

I've unchecked the visibility of GND on one , and it seems that one was copied several times. DRC was checked before sending to the manufacturer. Important takeaway from your message, I should always implement a serial port, which I've under-estimated its debugging capabilities. Unfortunately, I'm still at loss.