RUN command in STVD doesn`t work

[Ivan Berton]

Posted on February 26, 2017 at 10:17

Hi

I`m new with the STM8S-Discovery and the STM8S105.

I usually write my code in assembler so I get a deeper touch on the micros hardware.

But I encountered an issue with the STVD tool.

When I`m entering the debug mode and push the RUN button I can see

the red LED next to the USB connector blinking. But the simple code does not work.

The code should make the green LED blinking, but it doesn`t.

I can`t see any error message or other info.

But when I set the cursor on the first command(bset) of the code with SET PC(Debug menu)

and then select CONTINUE(Debug menu) the programm works. The green LED flashes correctly

until I stop the programm.

I can read out the code with STVP, so the micro is flashed.

But the programm does not work after unplug and replug the USB connector.

What I use:

ST Visual Develop 4.3.10

Windows 10

STM8S-Discovery (STM8S105C6)

Debeug instrument: SWIM ST-Link

The code looks like this:

--------------------------------------------------------

stm8/

               segment 'rom'

start

               bset         $5011,#0

loop_forever

               ldw           X,#$FFFF

loop_delay

               nop

               decw X

               jrne         loop_delay

               bcpl        $500F,#0

               jra           loop_forever

               end

--------------------------------------------------------

Something wrong with my handling of the STVD or micro initialising?

Thanks for any help

Ivan

[Max]

Posted on February 27, 2017 at 08:17

Hello,

Did you setup you interrupt vector table correctly?

I am talking specifically about the reset vector: it should be pointing to your start label.

BR

Max

[Ivan Berton]

Posted on February 28, 2017 at 13:02

 ,

 ,

Hi Max

Thanks for reply. I used legacy ST62 micros until now. Like I said I write my code in assembler. With the ST62 I used a text file mycode.asm and compiled it with ast6.exe to get the mycode.hex which I sent to the ST62 with the programmer.

Set up the reset vector for ST62 usually looks like this

-----------------------------------------------------------------------------------------------------------

.org 0080h

start , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,,main prog

.org 0ff0h

 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,,some other vectors

.org 0ffch

jp , , ,nmi_int  , , , , , , , , , , , , , , , , , , , , , ,,interrupt vector

jp , , ,start , , , , , , , , , , , , , , , , , , , , , , , , , , ,,reset vector pointed to the start of the program

.end

-----------------------------------------------------------------------------------------------------------

Now I use STVD and I`m not familiar with.

There is an automatic generated mapping.asm file which contains the info where to place the reset vector.

-----------------------------------------------------------------------------------------------------------

stm8/

,------------------------------------------------------

 ,

, SEGMENT MAPPING FILE AUTOMATICALLY GENERATED BY STVD

 ,

, SHOULD NOT BE MANUALLY MODIFIED.

 ,

, CHANGES WILL BE LOST WHEN FILE IS REGENERATED.

 ,

,------------------------------------------------------

 ,

♯ include 'mapping.inc'

BYTES , The following addresses are 8 bits long

 ,

segment byte at ram0_segment_start-ram0_segment_end 'ram0'

WORDS , The following addresses are 16 bits long

 ,

segment byte at ram1_segment_start-ram1_segment_end 'ram1'

WORDS , The following addresses are 16 bits long

 ,

segment byte at stack_segment_start-stack_segment_end 'stack'

WORDS , The following addresses are 16 bits long

 ,

segment byte at 4000-43FF 'eeprom'

WORDS , The following addresses are 16 bits long

 ,

segment byte at 8080-FFFF 'rom'

WORDS , The following addresses are 16 bits long

 ,

segment byte at 8000-807F 'vectit'

END

-----------------------------------------------------------------------------------------------------------

So what I have to do now? Place

 , , ,

 , , ,segment , , ,

'vectit'

 , , , , , , , , ,jp , , ,start

into my main program?

I found in the documentation INT as command to use instead of JP , but INT it`s not recognized as a valid comand by STVD.

Thanks for any help.

[Max]

Posted on March 01, 2017 at 07:50

Can you understand C language?

STM8 has many examples and libraries written in C, but not much in assembly.

If you can understand C, it will probably simplify your life a lot...

This was not the case with ST6: its core was not good for C compiler efficiency and most development work was done in assembler.

If C is an option for you,

http://cosmicsoftware.com/download_stm8_free.php

as a version free of charge for STM8 and use the

http://www.st.com/en/embedded-software/stsw-stm8069.html

either in your application or as example.

Otherwise, look at this site 

http://stm8sdiscovery.nano-age.co.uk/home

 : it shows a very simple start using the assembler.

Look at the Revenge of the blinking LED, it includes the interrupt vectors the way they should be for STM8

[Ivan Berton]

Posted on March 01, 2017 at 13:08

Thanks for the info. I used the vector table from 'the blinking led' page. It works now.