interfacing adxl362 accelerometer with ANNA-B112 ublox evaluation board (nrf52832) ,receive_buffer returns only 0xff on every spi_read

[Reshma Tomy]

I am trying to interface adxl362 sensor with ANNA-B112 evaluation board.i am trying to read the part id to check the connection. The code is pasted below.

nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
spi_config.ss_pin = 27;
spi_config.miso_pin = 2;
spi_config.mosi_pin = 3;
spi_config.sck_pin = 5;
spi_config.frequency = NRF_DRV_SPI_FREQ_125K;

APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));

m_tx_buf[0] = 0x0b;
m_tx_buf[1] = 0x02;
m_tx_buf[2] =0;
spi_xfer_done = false;


APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, m_tx_buf, 3, m_rx_buf, 3));
nrf_delay_ms(1000);

[haakonsh]

From the adxl362 datasheet:
The recommended SPI clock speeds are 1 MHz to 8 MHz, with 12 pF maximum loading.  

Also, try setting m_tx_buf[2] =0xFF; 
I have a vague memory of the adxl262 wanting an Over Read Character of 0xFF instead of 0x00, even though the documentation states that either is acceptable. 

[Reshma Tomy]

hi haakonsh,

I made the changes you mentioned above, but still, it's not working.

[haakonsh]

Do you have a digital analyzer scope of the communication?