RE: BLE Test Tx sweep

bjorn-spockeli — Thu, 07 Nov 2019 07:11:22 GMT

Happy to help

RE: BLE Test Tx sweep

Ramesh — Wed, 06 Nov 2019 20:17:28 GMT

Hi Bjorn,

Thanks for the info.

Regards,

Ramesh javadi

RE: BLE Test Tx sweep

bjorn-spockeli — Wed, 06 Nov 2019 10:01:51 GMT

HI Ramesh,

the naming in the radio test example is a bit misleading as the channel is infact the offset from 2400MHz, i.e.

Frequency = 2400MHz + channel

Hence, with channel_start = 02 and channel_end = 80 the Radio Test example will sweep the frequency between 2400MHz to 2480MHz.

If you want the sweep to do 2MHz increments instead of 1MHz increments in the frequency, then you can modify the m_channel++ line to m_channel = m_channel +2 in TIMER0_IRQHandler in radio_test.c

void TIMER0_IRQHandler(void)
{
    uint8_t channel_end   = m_channel_end;
    uint8_t channel_start = m_channel_start;
    uint8_t mode          = m_mode;
    uint8_t txpower       = m_txpower;

    // COMPARE[0] handles channel sweep
    if (NRF_TIMER0->EVENTS_COMPARE[0])
    {
        NRF_TIMER0->EVENTS_COMPARE[0] = 0;
        if (m_sweep_tx)
        {
            radio_unmodulated_tx_carrier(txpower, mode, m_channel);
        }
        else if (m_sweep_rx)
        {
            radio_rx(mode, m_channel);
        }
        else
        {
           //Do nothing
        }

        m_channel = m_channel +2;
        if (m_channel > channel_end)
        {
            m_channel = channel_start;
        }
    }
    // Timer sequence for function
    // radio_modulated_tx_carrier_with_delay(...)
    if (NRF_TIMER0->EVENTS_COMPARE[1])
    {
        NRF_TIMER0->EVENTS_COMPARE[1] = 0;
        if (!m_sweep_tx || !m_sweep_rx)
            NRF_RADIO->TASKS_TXEN = 1;
    }
}

Best regards

Bjørn