/* ---------------------------------------------------------------------------- */
/* Atmel Microcontroller Software Support */
/* SAM Software Package License */
/* ---------------------------------------------------------------------------- */
/* Copyright (c) 2015, Atmel Corporation */
/* */
/* All rights reserved. */
/* */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following condition is met: */
/* */
/* - Redistributions of source code must retain the above copyright notice, */
/* this list of conditions and the disclaimer below. */
/* */
/* Atmel's name may not be used to endorse or promote products derived from */
/* this software without specific prior written permission. */
/* */
/* DISCLAIMER: 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 */
/* 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. */
/* ---------------------------------------------------------------------------- */
/** \addtogroup ssc_module Working with SSC
* \ingroup peripherals_module
* The SSC driver provides the interface to configure and use the SSC
* peripheral.
*
* !Usage
*
* -# Enable the SSC interface pins.
* -# Configure the SSC to operate at a specific frequency by calling
* SSC_Configure(). This function enables the peripheral clock of the SSC,
* but not its PIOs.
* -# Configure the transmitter and/or the receiver using the
* SSC_ConfigureTransmitter() and SSC_ConfigureEmitter() functions.
* -# Enable the PIOs or the transmitter and/or the received.
* -# Enable the transmitter and/or the receiver using SSC_EnableTransmitter()
* and SSC_EnableReceiver()
* -# Send data through the transmitter using SSC_Write()
* -# Receive data from the receiver using SSC_Read()
* -# Disable the transmitter and/or the receiver using SSC_DisableTransmitter()
* and SSC_DisableReceiver()
*
* For more accurate information, please look at the SSC section of the
* Datasheet.
*
* Related files :\n
* \ref ssc.c\n
* \ref ssc.h.\n
*/
/*@{*/
/*@}*/
/**
* \file
*
* Implementation of Synchronous Serial (SSC) controller.
*
*/
/*----------------------------------------------------------------------------
* Headers
*----------------------------------------------------------------------------*/
#include "chip.h"
/*----------------------------------------------------------------------------
* Exported functions
*----------------------------------------------------------------------------*/
/**
* \brief Configures a SSC peripheral.If the divided clock is not used, the
* master clock frequency can be set to 0.
* \note The emitter and transmitter are disabled by this function.
* \param ssc Pointer to an SSC instance.
* \param bitRate bit rate.
* \param masterClock master clock.
*/
void SSC_Configure(Ssc *ssc, uint32_t bitRate, uint32_t masterClock)
{
uint32_t id;
// uint32_t maxClock;
id = ID_SSC;
// maxClock = PMC_SetPeriMaxClock(id, masterClock);
/* Reset, disable receiver & transmitter */
ssc->SSC_CR = SSC_CR_RXDIS | SSC_CR_TXDIS | SSC_CR_SWRST;
/* Configure clock frequency */
if (bitRate != 0)
ssc->SSC_CMR = masterClock / (2 * bitRate);
else
ssc->SSC_CMR = 0;
/* Enable SSC peripheral clock */
PMC_EnablePeripheral(id);
}
/**
* \brief Configures the transmitter of a SSC peripheral.
* \param ssc Pointer to an SSC instance.
* \param tcmr Transmit Clock Mode Register value.
* \param tfmr Transmit Frame Mode Register value.
*/
void SSC_ConfigureTransmitter(Ssc *ssc, uint32_t tcmr, uint32_t tfmr)
{
ssc->SSC_TCMR = tcmr;
ssc->SSC_TFMR = tfmr;
}
/**
* \brief Configures the receiver of a SSC peripheral.
* \param ssc Pointer to an SSC instance.
* \param rcmr Receive Clock Mode Register value.
* \param rfmr Receive Frame Mode Register value.
*/
void SSC_ConfigureReceiver(Ssc *ssc, uint32_t rcmr, uint32_t rfmr)
{
ssc->SSC_RCMR = rcmr;
ssc->SSC_RFMR = rfmr;
}
/**
* \brief Enables the transmitter of a SSC peripheral.
* \param ssc Pointer to an SSC instance.
*/
void SSC_EnableTransmitter(Ssc *ssc)
{
ssc->SSC_CR = SSC_CR_TXEN;
}
/**
* \brief Disables the transmitter of a SSC peripheral.
* \param ssc Pointer to an SSC instance.
*/
void SSC_DisableTransmitter(Ssc *ssc)
{
ssc->SSC_CR = SSC_CR_TXDIS;
}
/**
* \brief Enables the receiver of a SSC peripheral.
* \param ssc Pointer to an SSC instance.
*/
void SSC_EnableReceiver(Ssc *ssc)
{
ssc->SSC_CR = SSC_CR_RXEN;
}
/**
* \brief Disables the receiver of a SSC peripheral.
* \param ssc Pointer to an SSC instance.
*/
void SSC_DisableReceiver(Ssc *ssc)
{
ssc->SSC_CR = SSC_CR_RXDIS;
}
/**
* \brief Enables one or more interrupt sources of a SSC peripheral.
* \param ssc Pointer to an SSC instance.
* \param sources Bitwise OR of selected interrupt sources.
*/
void SSC_EnableInterrupts(Ssc *ssc, uint32_t sources)
{
ssc->SSC_IER = sources;
}
/**
* \brief Disables one or more interrupt sources of a SSC peripheral.
* \param ssc Pointer to an SSC instance.
* \param sources Bitwise OR of selected interrupt sources.
*/
void SSC_DisableInterrupts(Ssc *ssc, uint32_t sources)
{
ssc->SSC_IDR = sources;
}
/**
* \brief Sends one data frame through a SSC peripheral. If another frame is currently
* being sent, this function waits for the previous transfer to complete.
* \param ssc Pointer to an SSC instance.
* \param frame Data frame to send.
*/
void SSC_Write(Ssc *ssc, uint32_t frame)
{
while ((ssc->SSC_SR & SSC_SR_TXRDY) == 0);
ssc->SSC_THR = frame;
}
/**
* \brief Waits until one frame is received on a SSC peripheral, and returns it.
* \param ssc Pointer to an SSC instance.
*/
uint32_t SSC_Read(Ssc *ssc)
{
while ((ssc->SSC_SR & SSC_SR_RXRDY) == 0);
return ssc->SSC_RHR;
}
/**
* \brief Return 1 if one frame is received, 0 otherwise.
* \param ssc Pointer to an SSC instance.
*/
uint8_t SSC_IsRxReady(Ssc *ssc)
{
return ((ssc->SSC_SR & SSC_SR_RXRDY) > 0);
}