nrf52810 + PA board RF noise problem

[Mark J]

I'am testing nrf52810 and RFX2401 PA, sending ESB packet.

When i testing the radio power use Spectrum Analyzer, it shows that there are noise on other RF channel (see the picture blow).

NRF52810 set to 0dbm.

When i use nrf24l01+RFX2401, there is no that problem.

nrf52810_qfaa.pdf

[ketiljo]

Make sure you turn on the PA soon enough. If you turn on the PA after the TX is started, there will be a step in power that causes noise like this. What FW do you run?

[Mark J]

nRF5_SDK_17.0.2 nrf_esb.c

but i change the code,the step is:

1. tx enable

2. tx ready and pa enable 

3. tx disable and pa disable

static void tx_ppi_init()
{
NRF_GPIOTE->CONFIG[NRF_ESB_GPIOTE_PA] =((GPIOTE_CONFIG_MODE_Task << GPIOTE_CONFIG_MODE_Pos)
|(PIN_PA_ENABLE << GPIOTE_CONFIG_PSEL_Pos)
|(GPIOTE_CONFIG_POLARITY_Toggle << GPIOTE_CONFIG_POLARITY_Pos)
|(GPIOTE_CONFIG_OUTINIT_Low << GPIOTE_CONFIG_OUTINIT_Pos));

NRF_PPI->CH[NRF_ESB_PPI_TX_ENABLE].EEP = (uint32_t)&NRF_ESB_SYS_TIMER->EVENTS_COMPARE[0];
NRF_PPI->CH[NRF_ESB_PPI_TX_ENABLE].TEP = (uint32_t)&NRF_RADIO->TASKS_TXEN;

NRF_PPI->CH[NRF_ESB_PPI_PA_ENABLE].EEP = (uint32_t)&NRF_RADIO->EVENTS_READY;
NRF_PPI->CH[NRF_ESB_PPI_PA_ENABLE].TEP = (uint32_t)&NRF_GPIOTE->TASKS_SET[NRF_ESB_GPIOTE_PA];

NRF_PPI->CH[NRF_ESB_PPI_PA_DISABLE].EEP = (uint32_t)&NRF_RADIO->EVENTS_DISABLED;
NRF_PPI->CH[NRF_ESB_PPI_PA_DISABLE].TEP = (uint32_t)&NRF_GPIOTE->TASKS_CLR[NRF_ESB_GPIOTE_PA];

NRF_PPI->CHENSET = (1 << NRF_ESB_PPI_TX_ENABLE) |
(1 << NRF_ESB_PPI_PA_ENABLE) |
(1 << NRF_ESB_PPI_PA_DISABLE);
}

[ketiljo]

Can you try radio test instead? https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/nrf_radio_test_example.html