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PWM dutyCycleSet set to 100% doesn't work

Paolo

Hi.

I tried to create a function that would set a duty cycle of the PWM pin at runtime. The problem is that if I set the duty cycle to 100% the dutyCycleSet function returns an error.

status = g_fan.p_api->dutyCycleSet(g_fan.p_ctrl, 100, TIMER_PWM_UNIT_PERCENT, PIN);

Why? I have not figured out how to solve it.

Best regards

Paolo

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  • 0

    What does it return?

  • +1 in reply to Ian

    Hi Ian.

    It return SSP_ERR_INVALID_ARGUMENT.

    I made a workaround that should work.
    I still have to see with the oscilloscope if it's correct.

    if (99 < duty) {
        gpt_instance_ctrl_t * p_ctrl = (gpt_instance_ctrl_t *) g_fan.p_ctrl;
        R_GPTA0_Type *p_gpt_reg = (R_GPTA0_Type *) p_ctrl->p_reg;
        p_gpt_reg->GTUDDTYC_b.OADTY = 3;
    }
    else {
        ssp_err_t status = g_fan.p_api->dutyCycleSet(g_fan.p_ctrl, duty, TIMER_PWM_UNIT_PERCENT, PIN);

        if (SSP_SUCCESS != status)
        {
#ifndef NDEBUG
            __BKPT(0);
#endif
        }
    }

    Paolo

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  • +1 in reply to Ian

    Hi Ian.

    It return SSP_ERR_INVALID_ARGUMENT.

    I made a workaround that should work.
    I still have to see with the oscilloscope if it's correct.

    if (99 < duty) {
        gpt_instance_ctrl_t * p_ctrl = (gpt_instance_ctrl_t *) g_fan.p_ctrl;
        R_GPTA0_Type *p_gpt_reg = (R_GPTA0_Type *) p_ctrl->p_reg;
        p_gpt_reg->GTUDDTYC_b.OADTY = 3;
    }
    else {
        ssp_err_t status = g_fan.p_api->dutyCycleSet(g_fan.p_ctrl, duty, TIMER_PWM_UNIT_PERCENT, PIN);

        if (SSP_SUCCESS != status)
        {
#ifndef NDEBUG
            __BKPT(0);
#endif
        }
    }

    Paolo

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