alessandro-montanari

#define SPI_INSTANCE  1 /**< SPI instance index. */
#define BUFF_LENGTH 2        /**< Transfer length. */

static const nrf_drv_spi_t spi = NRF_DRV_SPI_INSTANCE(SPI_INSTANCE);  /**< SPI instance. */
static uint8_t       m_tx_buf[BUFF_LENGTH];  /**< TX buffer. */
static uint8_t       m_rx_buf[BUFF_LENGTH];   /**< RX buffer. */

static volatile bool burst_completed = false;
static volatile bool spi_xfer_done = false;  /**< Flag used to indicate that SPI instance completed the transfer. */