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Diffstat (limited to 'firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/SPI/spi.h')
| -rw-r--r-- | firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/SPI/spi.h | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/SPI/spi.h b/firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/SPI/spi.h new file mode 100644 index 0000000..6dcc928 --- /dev/null +++ b/firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/SPI/spi.h @@ -0,0 +1,342 @@ +/* This header file is part of the ATMEL AVR-UC3-SoftwareFramework-1.7.0 Release */ + +/*This file is prepared for Doxygen automatic documentation generation.*/ +/*! \file ********************************************************************* + * + * \brief SPI driver for AVR32 UC3. + * + * This file defines a useful set of functions for the SPI interface on AVR32 + * devices. + * + * - Compiler: IAR EWAVR32 and GNU GCC for AVR32 + * - Supported devices: All AVR32 devices with an SPI module can be used. + * - AppNote: + * + * \author Atmel Corporation: http://www.atmel.com \n + * Support and FAQ: http://support.atmel.no/ + * + ******************************************************************************/ + +/* Copyright (c) 2009 Atmel Corporation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * 3. The name of Atmel may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * 4. This software may only be redistributed and used in connection with an Atmel + * AVR product. + * + * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE + * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE + * + */ + +#ifndef _SPI_H_ +#define _SPI_H_ + +#include <avr32/io.h> + + +//! Time-out value (number of attempts). +#define SPI_TIMEOUT 10000 + + +//! Status codes used by the SPI driver. +typedef enum +{ + SPI_ERROR = -1, + SPI_OK = 0, + SPI_ERROR_TIMEOUT = 1, + SPI_ERROR_ARGUMENT, + SPI_ERROR_OVERRUN, + SPI_ERROR_MODE_FAULT, + SPI_ERROR_OVERRUN_AND_MODE_FAULT +} spi_status_t; + +//! Option structure for SPI channels. +typedef struct +{ + //! The SPI channel to set up. + unsigned char reg; + + //! Preferred baudrate for the SPI. + unsigned int baudrate; + + //! Number of bits in each character (8 to 16). + unsigned char bits; + + //! Delay before first clock pulse after selecting slave (in PBA clock periods). + unsigned char spck_delay; + + //! Delay between each transfer/character (in PBA clock periods). + unsigned char trans_delay; + + //! Sets this chip to stay active after last transfer to it. + unsigned char stay_act; + + //! Which SPI mode to use when transmitting. + unsigned char spi_mode; + + //! Disables the mode fault detection. + //! With this bit cleared, the SPI master mode will disable itself if another + //! master tries to address it. + unsigned char modfdis; +} spi_options_t; + + +/*! \brief Resets the SPI controller. + * + * \param spi Base address of the SPI instance. + */ +extern void spi_reset(volatile avr32_spi_t *spi); + +/*! \brief Initializes the SPI in slave mode. + * + * \param spi Base address of the SPI instance. + * \param bits Number of bits in each transmitted character (8 to 16). + * \param spi_mode Clock polarity and phase. + * + * \return Status. + * \retval SPI_OK Success. + * \retval SPI_ERROR_ARGUMENT Invalid argument(s) passed. + */ +extern spi_status_t spi_initSlave(volatile avr32_spi_t *spi, + unsigned char bits, + unsigned char spi_mode); + +/*! \brief Sets up the SPI in a test mode where the transmitter is connected to + * the receiver (local loopback). + * + * \param spi Base address of the SPI instance. + * + * \return Status. + * \retval SPI_OK Success. + */ +extern spi_status_t spi_initTest(volatile avr32_spi_t *spi); + +/*! \brief Initializes the SPI in master mode. + * + * \param spi Base address of the SPI instance. + * \param options Pointer to a structure containing initialization options. + * + * \return Status. + * \retval SPI_OK Success. + * \retval SPI_ERROR_ARGUMENT Invalid argument(s) passed. + */ +extern spi_status_t spi_initMaster(volatile avr32_spi_t *spi, const spi_options_t *options); + +/*! \brief Sets up how and when the slave chips are selected (master mode only). + * + * \param spi Base address of the SPI instance. + * \param variable_ps Target slave is selected in transfer register for every + * character to transmit. + * \param pcs_decode The four chip select lines are decoded externally. Values + * 0 to 14 can be given to \ref spi_selectChip. + * \param delay Delay in PBA periods between chip selects. + * + * \return Status. + * \retval SPI_OK Success. + * \retval SPI_ERROR_ARGUMENT Invalid argument(s) passed. + */ +extern spi_status_t spi_selectionMode(volatile avr32_spi_t *spi, + unsigned char variable_ps, + unsigned char pcs_decode, + unsigned char delay); + +/*! \brief Selects slave chip. + * + * \param spi Base address of the SPI instance. + * \param chip Slave chip number (normal: 0 to 3, extarnally decoded signal: 0 + * to 14). + * + * \return Status. + * \retval SPI_OK Success. + * \retval SPI_ERROR_ARGUMENT Invalid argument(s) passed. + */ +extern spi_status_t spi_selectChip(volatile avr32_spi_t *spi, unsigned char chip); + +/*! \brief Unselects slave chip. + * + * \param spi Base address of the SPI instance. + * \param chip Slave chip number (normal: 0 to 3, extarnally decoded signal: 0 + * to 14). + * + * \return Status. + * \retval SPI_OK Success. + * \retval SPI_ERROR_TIMEOUT Time-out. + * + * \note Will block program execution until time-out occurs if last transmission + * is not complete. Invoke \ref spi_writeEndCheck beforehand if needed. + */ +extern spi_status_t spi_unselectChip(volatile avr32_spi_t *spi, unsigned char chip); + +/*! \brief Sets options for a specific slave chip. + * + * The baudrate field has to be written before transfer in master mode. Four + * similar registers exist, one for each slave. When using encoded slave + * addressing, reg=0 sets options for slaves 0 to 3, reg=1 for slaves 4 to 7 and + * so on. + * + * \param spi Base address of the SPI instance. + * \param options Pointer to a structure containing initialization options for + * an SPI channel. + * \param pba_hz SPI module input clock frequency (PBA clock, Hz). + * + * \return Status. + * \retval SPI_OK Success. + * \retval SPI_ERROR_ARGUMENT Invalid argument(s) passed. + */ +extern spi_status_t spi_setupChipReg(volatile avr32_spi_t *spi, + const spi_options_t *options, + unsigned int pba_hz); + +/*! \brief Enables the SPI. + * + * \param spi Base address of the SPI instance. + */ +extern void spi_enable(volatile avr32_spi_t *spi); + +/*! \brief Disables the SPI. + * + * Ensures that nothing is transferred while setting up buffers. + * + * \param spi Base address of the SPI instance. + * + * \warning This may cause data loss if used on a slave SPI. + */ +extern void spi_disable(volatile avr32_spi_t *spi); + +/*! \brief Tests if the SPI is enabled. + * + * \param spi Base address of the SPI instance. + * + * \return \c 1 if the SPI is enabled, otherwise \c 0. + */ +extern int spi_is_enabled(volatile avr32_spi_t *spi); + +/*! \brief Checks if there is no data in the transmit register. + * + * \param spi Base address of the SPI instance. + * + * \return Status. + * \retval 1 No data in TDR. + * \retval 0 Some data in TDR. + */ +extern unsigned char spi_writeRegisterEmptyCheck(volatile avr32_spi_t *spi); + +/*! \brief Writes one data word in master fixed peripheral select mode or in + * slave mode. + * + * \param spi Base address of the SPI instance. + * \param data The data word to write. + * + * \return Status. + * \retval SPI_OK Success. + * \retval SPI_ERROR_TIMEOUT Time-out. + * + * \note Will block program execution until time-out occurs if transmitter is + * busy and transmit buffer is full. Invoke + * \ref spi_writeRegisterEmptyCheck beforehand if needed. + * + * \note Once the data has been written to the transmit buffer, the end of + * transmission is not waited for. Invoke \ref spi_writeEndCheck if + * needed. + */ +extern spi_status_t spi_write(volatile avr32_spi_t *spi, unsigned short data); + +/*! \brief Selects a slave in master variable peripheral select mode and writes + * one data word to it. + * + * \param spi Base address of the SPI instance. + * \param data The data word to write. + * \param pcs Slave selector (bit 0 -> nCS line 0, bit 1 -> nCS line 1, + * etc.). + * \param lastxfer Boolean indicating whether this is the last data word + * transfer. + * + * \return Status. + * \retval SPI_OK Success. + * \retval SPI_ERROR_TIMEOUT Time-out. + * \retval SPI_ERROR_ARGUMENT Invalid argument(s) passed. + * + * \note Will block program execution until time-out occurs if transmitter is + * busy and transmit buffer is full. Invoke + * \ref spi_writeRegisterEmptyCheck beforehand if needed. + * + * \note Once the data has been written to the transmit buffer, the end of + * transmission is not waited for. Invoke \ref spi_writeEndCheck if + * needed. + */ +extern spi_status_t spi_variableSlaveWrite(volatile avr32_spi_t *spi, + unsigned short data, + unsigned char pcs, + unsigned char lastxfer); + +/*! \brief Checks if all transmissions are complete. + * + * \param spi Base address of the SPI instance. + * + * \return Status. + * \retval 1 All transmissions complete. + * \retval 0 Transmissions not complete. + */ +extern unsigned char spi_writeEndCheck(volatile avr32_spi_t *spi); + +/*! \brief Checks if there is data in the receive register. + * + * \param spi Base address of the SPI instance. + * + * \return Status. + * \retval 1 Some data in RDR. + * \retval 0 No data in RDR. + */ +extern unsigned char spi_readRegisterFullCheck(volatile avr32_spi_t *spi); + +/*! \brief Reads one data word in master mode or in slave mode. + * + * \param spi Base address of the SPI instance. + * \param data Pointer to the location where to store the received data word. + * + * \return Status. + * \retval SPI_OK Success. + * \retval SPI_ERROR_TIMEOUT Time-out. + * + * \note Will block program execution until time-out occurs if no data is + * received or last transmission is not complete. Invoke + * \ref spi_writeEndCheck or \ref spi_readRegisterFullCheck beforehand if + * needed. + */ +extern spi_status_t spi_read(volatile avr32_spi_t *spi, unsigned short *data); + +/*! \brief Gets status information from the SPI. + * + * \param spi Base address of the SPI instance. + * + * \return Status. + * \retval SPI_OK Success. + * \retval SPI_ERROR_OVERRUN Overrun error. + * \retval SPI_ERROR_MODE_FAULT Mode fault (SPI addressed as slave + * while in master mode). + * \retval SPI_ERROR_OVERRUN_AND_MODE_FAULT Overrun error and mode fault. + */ +extern unsigned char spi_getStatus(volatile avr32_spi_t *spi); + + +#endif // _SPI_H_ |