bluetopia SPPDemo: change BTslowCLK from ACLK to SMCLK - help!

Daniel Rumetshofer

Other Parts Discussed in Thread: MSP430F5438A

Hi,

i am currently building a simple pcb with MSP430F5438A+PAN1326 and using the bluetopia SPPDemo with little adoptions.

on my eval-board it works fine, but now i found out, that on the PCB i made a mistake and connected the SMCLK (P4.7) instead of ACLK (11.0) to the Bluetooth-Slow-CLK-Line.

i think it should be possible to change this in code, so i can save the money for new pcb´s!?

i already changed the port+pin in the HRDWCFG.h, but this was not enough?! not working so far, because i measure 8Mhz on the Pin..

i am using the internal dco , and added also:
UCSCTL4 |= SELS_2;
now i can measure the 32khz on the smclk-pin, but the init-stack still fails (-4).

i suppose SMCLK is used anywhere else, but i cannot find where?!
before i destroy more than i repair i wanted to ask here for help!

thanks.

over 11 years ago

0 Sundeep Javvaji over 11 years ago

TI__Mastermind 32615 points

Hi Daniel,

I think SMCLK can be sourced from the 32 XTAL as the ACLK. As per the MSP430 data sheet

• Sub-Main clock (SMCLK), the subsystem clock used by the peripheral modules. SMCLK can be sourced by same sources made available to ACLK

But moving it to MSP430 forum for a better answer.

0 Daniel Rumetshofer over 11 years ago in reply to Sundeep Javvaji

Intellectual 670 points

Hi Mandava,

my problem is not to source the SMCLK, i already managed to measure the 32khz-signal on the SMCLK-pin.

my problem is, that if i source the SMCLK with 32khz, the initialization of the stack fails!

i suppose, that the SMCLK is internally used for any other parts of the program, and therefore this part is not working correct anymore.

i think it is a specific problem with the bluetopia-stack or the sppdemo-sample, and cannot be solved in this general MSP430 forum!?

Daniel

0 Sundeep Javvaji over 11 years ago in reply to Daniel Rumetshofer

TI__Mastermind 32615 points

Hi Daniel,

I am checking it internally with the hardware team, I will get back to you on this.

0 Daniel Rumetshofer over 11 years ago in reply to Sundeep Javvaji

Intellectual 670 points

Hi Mandava,

thanks for your reply, but you dont need to invest more time on this.
because i found an additional bug in the pcb, i had to redesign it anyway.
i already changed the clock-line to the original pinning. so i dont have to make any changes in the code...

Daniel

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bluetopia SPPDemo: change BTslowCLK from ACLK to SMCLK - help!