cc3200 spi comunication as gpio cs

Hi,

This is not a problem control multiple SPI slaves (=CS) by GPIO. In my application I use this "code":

// macro(s) for SPI transfers
#define SPIWrite(len, txBuff) MAP_SPITransfer(GSPI_BASE, txBuff, 0, len, 0)
#define SPIRead(len, rxBuff)  MAP_SPITransfer(GSPI_BASE, 0, rxBuff, len, 0)
#define SPIReadWrite(len, txBuff, rxBuff)  MAP_SPITransfer(GSPI_BASE, txBuff, rxBuff, len, 0)

// 5MHz
#define SPI_BIT_RATE 5000000

// OS lock object for synchronisation
static OsiLockObj_t spiLock;

// *** SPI init function 
void SPIlibInit(void) {

  osi_LockObjCreate(&spiLock);

  // enable SPI clock
  MAP_PRCMPeripheralClkEnable(PRCM_GSPI, PRCM_RUN_MODE_CLK);
  // SPI_CLK
  MAP_PinTypeSPI(PIN_05, PIN_MODE_7);
  // SPI_MISO
  MAP_PinTypeSPI(PIN_06, PIN_MODE_7);
  // GSPI_MOSI
  MAP_PinTypeSPI(PIN_07, PIN_MODE_7);
  // SPI reset
  MAP_SPIReset(GSPI_BASE);

  // set SPI config
  MAP_SPIConfigSetExpClk(GSPI_BASE,
                         MAP_PRCMPeripheralClockGet(PRCM_GSPI),
                         SPI_BIT_RATE,
                         SPI_MODE_MASTER,
                         SPI_SUB_MODE_3,
                        (SPI_3PIN_MODE |
                         SPI_TURBO_OFF |
                         SPI_WL_8));
}


// *** CS enable (CS PIN need to be configured to GPIO and output)
void SPILockCSWait(unsigned long port, unsigned char mask) {

  osi_LockObjLock(&spiLock, OSI_WAIT_FOREVER);

  HWREG(port + (GPIO_O_GPIO_DATA + (mask << 2))) = 0x00;
  MAP_SPIEnable(GSPI_BASE);
}


// *** CS disable (CS PIN need to be configured to GPIO and output)
void SPIUnlockCS(unsigned long port, unsigned char mask) {

  MAP_SPIDisable(GSPI_BASE);
  HWREG(port + (GPIO_O_GPIO_DATA + (mask << 2))) = 0xFF;

  osi_LockObjUnlock(&spiLock);
}

Jan