BLACKSheep® Examples page

Scope

[This page shows some c-Code examples for using the BLACKSheep(c) drivers.

Serial Interface Driver

SPI

First the SPI bus must be initialized. Than a call of SPIopen for each slave is necessary.
Currently only the master mode is supported.

<source lang="c">

       /*************************************************************/
       /*               Initialize the spi bus first                */
       /*************************************************************/

       unsigned long nSCLK = 125000000;  // current system clock in [Hz]
       unsigned long nCCLK = 500000000;  // current core clock in [Hz]

   #ifdef SPI_INIT_BUS_0
       nPrintWidth=printf ("Initialize SPI interface 0...");
       tErrorCode = SPIsetup(0, nSCLK, nCCLK, true); 
       if(tErrorCode) {
           BS_PRINTF_FAILED(nPrintWidth);
       }
       else {
           BS_PRINTF_OK(nPrintWidth);
       }
   #endif
   #ifdef SPI_INIT_BUS_1
       nPrintWidth=printf ("Initialize SPI interface 1...");
       tErrorCode = SPIsetup(1, nSCLK, nCCLK, true); 
       if(tErrorCode) {
           BS_PRINTF_FAILED(nPrintWidth);
       }
       else {
           BS_PRINTF_OK(nPrintWidth);
       }
   #endif
   #ifdef SPI_INIT_BUS_2
       nPrintWidth=printf ("Initialize SPI interface 2...");
       tErrorCode = SPIsetup(2, nSCLK, nCCLK, true); 
       if(tErrorCode) {
           BS_PRINTF_FAILED(nPrintWidth);
       }
       else {
           BS_PRINTF_OK(nPrintWidth);
       }
   #endif        

       /*************************************************************/
       /*                     Open an SPI slave                     */
       /*************************************************************/

T_SPI_CONFIG SPICfg;

       unsigned char cSPI = 0;                           //SPI bus number

unsigned long ulCSEL = 0x80000800; //Use PF11 as CS // unsigned long ulCSEL = 0x80001000; //Use PF12 as CS // unsigned long ulCSEL = 0x80002000; //Use PF13 as CS // unsigned long ulCSEL = 0x80004000; //Use PF14 as CS

SPICfg.mbMaSl = true; //Currently only master mode is supported, so set it to true. SPICfg.mtCSEL = ulCSEL; SPICfg.mnBaudrate = 20000000; //Baudrate in [Hz] SPICfg.mnTransferSize = SPI_8BIT; SPICfg.mnClockPolarity = SPI_CPOL_HIGH; SPICfg.mnClockPhase = SPI_CPHA_HIGH; SPICfg.mnMsbLsbFirst = SPI_MSB_FIRST; //MSB first or LSB first SPICfg.mnMasterErrorFlag = SPI_NONE; //Dont change this SPICfg.msDefaultWord = 0; //Bitpattern which should be clocked out during an SPIread.

T_SPI_HANDLE hSPI = SPIopen(cSPI, &SPICfg, NULL);

       /*************************************************************/
       /*          Device should be ready for data transfer         */
       /*************************************************************/
       unsigned short ausData[50];
       SPIread(hSPI, ausData, 50, NULL);                //Read out 50 bytes of data.
       SPIwrite(hSPI, ausData, 50, NULL);               //Write 50 bytes of data.

</source>