setup SWV on STM32F429_Discovery board

[jo_it]

Posted on December 23, 2014 at 19:37

How to setup SWV on this board? Do I need to solder SB9? pin T_SWO

#!stm32f4-disco #swv-st-link/v2 #printf-fprintf-itm

[Tesla DeLorean]

Posted on December 23, 2014 at 20:55

Yes you'll need to solder the bridges (varies by DISCO, some come made, others not) to connect SWO (PB3) to the ST-LINK.The viewer software needs be configured to the speed of the processor, whatever your clocks/PLLs are set too, 168 MHz, 180 MHz, etc.For things like Keil you'll need to configure the Trace pane, for the ST-LINK SWV screen mostly just the frequency.You STM32 based code will need to output via the ITM functions, and pipe printf/putchar functionality through suitable hosting code.

https://community.st.com/0D50X00009Xkh5nSAB

 

GNU printf via SWV

 

https://community.st.com/0D50X00009XkhwgSAB

 

Keil SWV hosting - STM32F3-DISCO but on point.

Edited: Removed DEAD LINKs, original post from 23-Dec-2014

[jo_it]

Posted on December 24, 2014 at 10:20

@clive1 Tnx for the nice links to other threads! When I queried here in the bin on 'swv' I didn't get those links.

[Tesla DeLorean]

Posted on December 24, 2014 at 16:56

When I queried here in the bin on 'swv' I didn't get those links.

The search feature on this Microsoft forum are worse than useless, I use Google to find my old stuff and related posts. The links to forum posts are also ridiculously long, and the software is dysfunctional from mobile devices (tablets and phones)

[jo_it]

Posted on December 25, 2014 at 10:07

I soldered SB9. So SWO is short with PB3.

If I debug ITMDebugEnable

void Debug_ITMDebugEnable(void) 
{ 
volatile unsigned int *ITM_TER = (volatile unsigned int *)0xE0000E00; 
volatile unsigned int *SCB_DHCSR = (volatile unsigned int *)0xE000EDF0; 
volatile unsigned int *DBGMCU_CR = (volatile unsigned int *)0xE0042004; 
*DBGMCU_CR |= 0x27; // DBGMCU_CR 
if ((*SCB_DHCSR & 1) && (*ITM_TER & 1)) // Enabled? 
Debug_ITMDebug = 1; 
}

Debug_ITMDebug don't get '1' because the value in ITM_TER at address 0xE0000E00 stays 0x00000000. SCB_DHCSR at 0xE000EDF0 value is 0x00030 Whyis theITM_TER register for? I can't find the answer in 'ST'-manual RM0

[Tesla DeLorean]

Posted on December 26, 2014 at 17:02

The ITM is part of the Cortex-M4 core, you'd need to review ARM's documentation for this, not ST's.

You might want to look at what the registers are set to by the ST-LINK Utilities SWV window.

[jo_it]

Posted on December 27, 2014 at 11:46

This info confuse me. Do I need to select JTAG for ITEM debug?

[jo_it]

Posted on December 27, 2014 at 13:15

I believed semihosting, as they use in CoIDE, was the same as ITM debug. But it's a completely different concept. CoIDE support ITM debug in anyway? Or what viewer is applicable?

[jo_it]

Posted on December 27, 2014 at 13:56

Finally installed the ST-link utility. Registers are ok now. With default clock setting in  SWO viewer, stimulus port 0, there are some strange characters printed on the console.

If I change clock setting to the systemclock no characters are printed. I select all channels.

In memory region 0xE0001000 - 0xE0001001 values are constant changing.

[jo_it]

Posted on December 27, 2014 at 14:28

Device reset and the beast is working!

[jo_it]

Posted on December 27, 2014 at 19:30

Actually after flashing you need to reset the core and swv will hold the cpu untill you press 'start'.