CC2530: 2330

You can refer to the following defines in hal_board_cfg.h

/* ----------- XNV ---------- */
#define XNV_SPI_BEGIN()             st(P1_3 = 0;)
#define XNV_SPI_TX(x)               st(U1CSR &= ~0x02; U1DBUF = (x);)
#define XNV_SPI_RX()                U1DBUF
#define XNV_SPI_WAIT_RXRDY()        st(while (!(U1CSR & 0x02));)
#define XNV_SPI_END()               st(P1_3 = 1;)

// The TI reference design uses UART1 Alt. 2 in SPI mode.
#define XNV_SPI_INIT() \
st( \
  /* Mode select UART1 SPI Mode as master. */\
  U1CSR = 0; \
  \
  /* Setup for 115200 baud. */\
  U1GCR = 11; \
  U1BAUD = 216; \
  \
  /* Set bit order to MSB */\
  U1GCR |= BV(5); \
  \
  /* Set UART1 I/O to alternate 2 location on P1 pins. */\
  PERCFG |= 0x02;  /* U1CFG */\
  \
  /* Select peripheral function on I/O pins but SS is left as GPIO for separate control. */\
  P1SEL |= 0xE0;  /* SELP1_[7:4] */\
  /* P1.1,2,3: reset, LCD CS, XNV CS. */\
  P1SEL &= ~0x0E; \
  P1 |= 0x0E; \
  P1_1 = 0; \
  P1DIR |= 0x0E; \
  \
  /* Give UART1 priority over Timer3. */\
  P2SEL &= ~0x20;  /* PRI2P1 */\
  \
  /* When SPI config is complete, enable it. */\
  U1CSR |= 0x40; \
  /* Release XNV reset. */\
  P1_1 = 1; \
)

and also refer to how the following functions use SPI defines to do read/write to external SPI flash in hal_ota.c

static void HalSPIRead(uint32 addr, uint8 *pBuf, uint16 len);
static void HalSPIWrite(uint32 addr, uint8 *pBuf, uint16 len);
static void xnvSPIWrite(uint8 ch);