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*************************************************************
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*************************************************************
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* \brief SPI bus functions
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* \brief SPI bus functions
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*
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*
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* \details Library to communicate with SPI devices
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* \details Library to communicate with SPI devices
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*
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*
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* \author GNU Radio guys
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* \author GNU Radio team
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*
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*
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* \note to use this SPI library you have to define the following
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* \note to use this SPI library you have to define the following
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* keywords in your pinmapping header file. For GECKO3COM
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* keywords in your pinmapping header file. For GECKO3COM
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* this is the "gecko3com_regs.h" file. \n
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* this is the "gecko3com_regs.h" file. \n
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* \li SPI_PORT, SPI signals are connected to this port
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* \li SPI_PORT, SPI signals are connected to this port
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/*
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/*
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* SPI_FMT_* goes in wIndexL
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* SPI_FMT_* goes in wIndexL
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*/
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*/
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#define bmSPI_FORMAT 0x80
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#define bmSPI_FORMAT 0x80 /**< bitmask to work on the format */
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# define bmSPI_FORMAT_LSB 0x80 /**< least signficant bit first */
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# define bmSPI_FORMAT_LSB 0x80 /**< least signficant bit first */
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# define bmSPI_FORMAT_MSB 0x00 /**< most significant bit first */
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# define bmSPI_FORMAT_MSB 0x00 /**< most significant bit first */
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#define bmSPI_HEADER 0x60
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#define bmSPI_HEADER 0x60 /**< bits to select the header bytes */
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# define bmSPI_HEADER_0 0x00 /**< 0 header bytes */
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# define bmSPI_HEADER_0 0x00 /**< 0 header bytes */
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# define bmSPI_HEADER_1 0x20 /**< 1 header byte */
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# define bmSPI_HEADER_1 0x20 /**< 1 header byte */
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# define bmSPI_HEADER_2 0x40 /**< 2 header bytes */
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# define bmSPI_HEADER_2 0x40 /**< 2 header bytes */
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/** one time call to init SPI subsystem */
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/** one time call to init SPI subsystem */
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void init_spi (void);
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void init_spi (void);
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/** \brief basic function to read data from the SPI bus
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/** \brief basic function to read data from the SPI bus
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* \param[in] unsigned char header_hi, high byte of the header to send
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* \param[in] header_hi high byte of the header to send
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* \param[in[ unsigned char header_lo, low byte of the header to send
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* \param[in] header_lo low byte of the header to send
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* \param[in] unsigned char enables, bitmask with the correct device selected
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* \param[in] enables bitmask with the correct device selected
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* \param[in] unsigned char format, bitmask byte to select byte order
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* \param[in] format bitmask byte to select byte order
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* and number of header bytes
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* and number of header bytes
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* \param[out]*buf pointer to a buffer to write the received data in it
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* \param[out]*buf pointer to a buffer to write the received data in it
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* \param[in] unsigned char len, number of bytes to be read from bus
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* \param[in] len number of bytes to be read from bus
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*
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*
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* \return returns non-zero if successful, else 0 */
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* \return returns non-zero if successful, else 0 */
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unsigned char
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unsigned char
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spi_read (unsigned char header_hi, unsigned char header_lo,
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spi_read (unsigned char header_hi, unsigned char header_lo,
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unsigned char enables, unsigned char format,
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unsigned char enables, unsigned char format,
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xdata unsigned char *buf, unsigned char len);
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xdata unsigned char *buf, unsigned char len);
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/** \brief basic function to write data to the SPI bus
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/** \brief basic function to write data to the SPI bus
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* \param[in] unsigned char header_hi, high byte of the header to send
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* \param[in] header_hi high byte of the header to send
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* \param[in[ unsigned char header_lo, low byte of the header to send
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* \param[in] header_lo low byte of the header to send
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* \param[in] unsigned char enables, bitmask with the correct device selected
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* \param[in] enables bitmask with the correct device selected
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* \param[in] unsigned char format, bitmask byte to select byte order
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* \param[in] format bitmask byte to select byte order
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* and number of header bytes
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* and number of header bytes
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* \param[in]*buf pointer to a buffer which holds the data to send
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* \param[in]*buf pointer to a buffer which holds the data to send
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* \param[in] unsigned char len, number of bytes to be written to the bus
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* \param[in] len number of bytes to be written to the bus
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*
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*
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* \return returns non-zero if successful, else 0 */
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* \return returns non-zero if successful, else 0 */
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unsigned char
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unsigned char
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spi_write (unsigned char header_hi, unsigned char header_lo,
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spi_write (unsigned char header_hi, unsigned char header_lo,
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unsigned char enables, unsigned char format,
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unsigned char enables, unsigned char format,
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