Inter SPI time

RE: Inter SPI time

Sigurd — Mon, 13 Sep 2021 12:30:33 GMT

Hi,

The list feature is enable by the driver when the POSTINC flags are set.

See this page on how to use the driver in advanced mode:

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/hardware_driver_spi_master.html#hardware_driver_spi_advanced

RE: Inter SPI time

JIYEON — Mon, 30 Aug 2021 01:34:27 GMT

Hi,

I tried array list. Still 18u sec takes between SPI.

Regarding Easy DMA, I have some questions.

In my configuration, SPI0_USE_EASY_DMA is already enabled.

I defined Tx&Rx buffer as Array list.

#define BUFFER_SIZE  2

typedef struct ArrayList
{
    uint8_t buffer[BUFFER_SIZE];
} ArrayList_type;

ArrayList_type gau8TxData[NB_16BIT_XFERS] = {0};
ArrayList_type gau8RxData[NB_16BIT_XFERS] = {0};

and execute SPI communication like below.

        for(index = 0; index < (nbBYtes / 2); index++)
        {
            spi1_xfer_done = false;

            err_code = nrf_drv_spi_transfer(&m_spi_ntm, &gau8TxData[index], 2, &gau8RxData[index], 2);
            RETURN_IF_ERROR(err_code);

            while (!spi1_xfer_done)
            {
                __WFE();
            }
        }

But I can't find .MAXCNT nor .PTR which is specified in your link.
Did I miss something?

RE: Inter SPI time

Sigurd — Fri, 27 Aug 2021 14:05:49 GMT

Hi,

You could try using array list to improve this.

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/spim.html#topic