CC2640 Custom Board (HID Advanced Remote) | Off - Chip OAD Feature | SPI External Flash | BIM Issue

// Board LED defines
#define BSP_IOID_LED_1          IOID_UNUSED
#define BSP_IOID_LED_2          IOID_UNUSED

// Board key defines
#define BSP_IOID_KEY_LEFT       IOID_UNUSED
#define BSP_IOID_KEY_RIGHT      IOID_UNUSED

// Board external flash defines
#define BSP_IOID_FLASH_CS       IOID_30
#define BSP_SPI_MOSI            IOID_19
#define BSP_SPI_MISO            IOID_18
#define BSP_SPI_CLK_FLASH       IOID_17

One more time, in order to evaluate the SPI communication, we put some breakpoints to debug the extFlashOpen function. Unfortunately the results are not the expected. The CC2640 can't read the flash information. However it's completely normal because according to the logic analyzer (see picture below), there is no clock signal. The SPI interface configuration remains unchanged:

  /* SPI configuration */
  SSIIntDisable(BLS_SPI_BASE, SSI_RXOR | SSI_RXFF | SSI_RXTO | SSI_TXFF);
  SSIIntClear(BLS_SPI_BASE, SSI_RXOR | SSI_RXTO);
  ROM_SSIConfigSetExpClk(BLS_SPI_BASE,
                         BLS_CPU_FREQ, /* CPU rate */
                         SSI_FRF_MOTO_MODE_0, /* frame format */
                         SSI_MODE_MASTER, /* mode */
                         bitRate, /* bit rate */
                         8); /* data size */
  ROM_IOCPinTypeSsiMaster(BLS_SPI_BASE, BSP_SPI_MISO, BSP_SPI_MOSI,
                          IOID_UNUSED /* csn */, clkPin);
  SSIEnable(BLS_SPI_BASE);

  {
    /* Get read of residual data from SSI port */
    uint32_t buf;

    while (SSIDataGetNonBlocking(BLS_SPI_BASE, &buf));
  }