MSP430, timer B7 will not run.

WayneB

I have been working on a project that uses Timer B. It was all working well, for some unknown reason the counter stopped counting. After eliminating the hardware I went back to the eval board and tried to just make Timer B count up using SMCLK. I made a simple Grace project and set the registers. Single stepping, TBR just sits at zero. This has to be something so simple but I can not find what I am missing. I am embarrassed to even ask for help with this.

This is what Grace created:

void Timer_B7_init(void)
{
    /* 
     * TBCTL, Timer_B7 Control Register
     * 
     * CNTL_0 -- 16-bit, TBR(max) = 0FFFFh
     * TBSSEL_2 -- SMCLK
     * ID_0 -- Divider - /1
     * MC_1 -- Up Mode
     */
    TBCTL = TBCLGRP_0 + CNTL_0 + TBSSEL_2 + ID_0 + MC_1;
}

Is there something else that's needs to be set in order to make the counter run?

over 13 years ago

Marco over 13 years ago

Expert 1480 points

Hello WayneB,

i reproduced your issue and got the timer running with

void Timer_B7_init(void)
{
TBCTL=0;
    /*
     * TBCTL, Timer_B7 Control Register
     *
     * CNTL_0 -- 16-bit, TBR(max) = 0FFFFh
     * TBSSEL_2 -- SMCLK
     * ID_0 -- Divider - /1
     * MC_1 -- Up Mode
     */
    TBCTL = TBCLGRP_0 + CNTL_0 + TBSSEL_2 + ID_0 + MC_1;


    TBCCR0=0xFFFF; // <- seems to init    TBxCL0 , choose value to count up to
}

Kind regards

Marco

WayneB over 13 years ago in reply to Marco

Intellectual 260 points

Thank you Marco,

You are correct, it works for me as well. I started the project in CCS4 and then upgraded to 5. I wonder if the Grace tool in 4 handled the config differently.

To make Grace add this, you have to enter the value in the Timer Capture/Compare #0 , Capture Register field even though its not really being used for anything else.

Thanks Again.

Wayne

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MSP430, timer B7 will not run.