mirror of
https://github.com/digistump/DigistumpArduino.git
synced 2025-09-17 17:32:25 -07:00
switch to setup for Arduino Boards Manager
This commit is contained in:
Erik Tylek Kettenburg
236
digistump-sam/system/libsam/source/tc.c
Normal file
236
digistump-sam/system/libsam/source/tc.c
Normal file
@@ -0,0 +1,236 @@
|
||||
/* ----------------------------------------------------------------------------
|
||||
* SAM Software Package License
|
||||
* ----------------------------------------------------------------------------
|
||||
* Copyright (c) 2011-2012, 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.
|
||||
* ----------------------------------------------------------------------------
|
||||
*/
|
||||
|
||||
/**
|
||||
* \file
|
||||
*
|
||||
* Implementation of Timer Counter (TC).
|
||||
*
|
||||
*/
|
||||
|
||||
/*------------------------------------------------------------------------------
|
||||
* Headers
|
||||
*------------------------------------------------------------------------------*/
|
||||
|
||||
#include "chip.h"
|
||||
|
||||
#include <assert.h>
|
||||
|
||||
/*------------------------------------------------------------------------------
|
||||
* Global functions
|
||||
*------------------------------------------------------------------------------*/
|
||||
|
||||
/**
|
||||
* \brief Configures a Timer Counter Channel
|
||||
*
|
||||
* Configures a Timer Counter to operate in the given mode. Timer is stopped
|
||||
* after configuration and must be restarted with TC_Start(). All the
|
||||
* interrupts of the timer are also disabled.
|
||||
*
|
||||
* \param pTc Pointer to a Tc instance.
|
||||
* \param channel Channel number.
|
||||
* \param mode Operating mode (TC_CMR value).
|
||||
*/
|
||||
extern void TC_Configure( Tc *pTc, uint32_t dwChannel, uint32_t dwMode )
|
||||
{
|
||||
TcChannel* pTcCh ;
|
||||
|
||||
assert( dwChannel < (sizeof( pTc->TC_CHANNEL )/sizeof( pTc->TC_CHANNEL[0] )) ) ;
|
||||
pTcCh = pTc->TC_CHANNEL+dwChannel ;
|
||||
|
||||
/* Disable TC clock */
|
||||
pTcCh->TC_CCR = TC_CCR_CLKDIS ;
|
||||
|
||||
/* Disable interrupts */
|
||||
pTcCh->TC_IDR = 0xFFFFFFFF ;
|
||||
|
||||
/* Clear status register */
|
||||
pTcCh->TC_SR ;
|
||||
|
||||
/* Set mode */
|
||||
pTcCh->TC_CMR = dwMode ;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief Reset and Start the TC Channel
|
||||
*
|
||||
* Enables the timer clock and performs a software reset to start the counting.
|
||||
*
|
||||
* \param pTc Pointer to a Tc instance.
|
||||
* \param dwChannel Channel number.
|
||||
*/
|
||||
extern void TC_Start( Tc *pTc, uint32_t dwChannel )
|
||||
{
|
||||
TcChannel* pTcCh ;
|
||||
|
||||
assert( dwChannel < (sizeof( pTc->TC_CHANNEL )/sizeof( pTc->TC_CHANNEL[0] )) ) ;
|
||||
|
||||
pTcCh = pTc->TC_CHANNEL+dwChannel ;
|
||||
pTcCh->TC_CCR = TC_CCR_CLKEN | TC_CCR_SWTRG ;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief Stop TC Channel
|
||||
*
|
||||
* Disables the timer clock, stopping the counting.
|
||||
*
|
||||
* \param pTc Pointer to a Tc instance.
|
||||
* \param dwChannel Channel number.
|
||||
*/
|
||||
extern void TC_Stop(Tc *pTc, uint32_t dwChannel )
|
||||
{
|
||||
TcChannel* pTcCh ;
|
||||
|
||||
assert( dwChannel < (sizeof( pTc->TC_CHANNEL )/sizeof( pTc->TC_CHANNEL[0] )) ) ;
|
||||
|
||||
pTcCh = pTc->TC_CHANNEL+dwChannel ;
|
||||
pTcCh->TC_CCR = TC_CCR_CLKDIS ;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief Find best MCK divisor
|
||||
*
|
||||
* Finds the best MCK divisor given the timer frequency and MCK. The result
|
||||
* is guaranteed to satisfy the following equation:
|
||||
* \code
|
||||
* (MCK / (DIV * 65536)) <= freq <= (MCK / DIV)
|
||||
* \endcode
|
||||
* with DIV being the highest possible value.
|
||||
*
|
||||
* \param dwFreq Desired timer frequency.
|
||||
* \param dwMCk Master clock frequency.
|
||||
* \param dwDiv Divisor value.
|
||||
* \param dwTcClks TCCLKS field value for divisor.
|
||||
* \param dwBoardMCK Board clock frequency.
|
||||
*
|
||||
* \return 1 if a proper divisor has been found, otherwise 0.
|
||||
*/
|
||||
extern uint32_t TC_FindMckDivisor( uint32_t dwFreq, uint32_t dwMCk, uint32_t *dwDiv, uint32_t *dwTcClks, uint32_t dwBoardMCK )
|
||||
{
|
||||
const uint32_t adwDivisors[5] = { 2, 8, 32, 128, dwBoardMCK / 32768 } ;
|
||||
|
||||
uint32_t dwIndex = 0 ;
|
||||
|
||||
/* Satisfy lower bound */
|
||||
while ( dwFreq < ((dwMCk / adwDivisors[dwIndex]) / 65536) )
|
||||
{
|
||||
dwIndex++ ;
|
||||
|
||||
/* If no divisor can be found, return 0 */
|
||||
if ( dwIndex == (sizeof( adwDivisors )/sizeof( adwDivisors[0] )) )
|
||||
{
|
||||
return 0 ;
|
||||
}
|
||||
}
|
||||
|
||||
/* Try to maximize DIV while satisfying upper bound */
|
||||
while ( dwIndex < 4 )
|
||||
{
|
||||
|
||||
if ( dwFreq > (dwMCk / adwDivisors[dwIndex + 1]) )
|
||||
{
|
||||
break ;
|
||||
}
|
||||
dwIndex++ ;
|
||||
}
|
||||
|
||||
/* Store results */
|
||||
if ( dwDiv )
|
||||
{
|
||||
*dwDiv = adwDivisors[dwIndex] ;
|
||||
}
|
||||
if ( dwTcClks )
|
||||
{
|
||||
*dwTcClks = dwIndex ;
|
||||
}
|
||||
|
||||
return 1 ;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief Read Timer Counter Counter Value on the selected TC & channel.
|
||||
*
|
||||
* \param p_tc Pointer to a TC instance.
|
||||
* \param ul_channel Channel to configure.
|
||||
*
|
||||
* \return RC value.
|
||||
*/
|
||||
uint32_t TC_ReadCV(Tc *p_tc, uint32_t ul_channel){
|
||||
return p_tc->TC_CHANNEL[ul_channel].TC_CV;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief Get current status on the selected channel.
|
||||
*
|
||||
* \param p_tc Pointer to a TC instance.
|
||||
* \param ul_channel Channel to configure.
|
||||
*
|
||||
* \return The current TC status.
|
||||
*/
|
||||
uint32_t TC_GetStatus(Tc *p_tc, uint32_t ul_channel)
|
||||
{
|
||||
TcChannel *tc_channel;
|
||||
|
||||
tc_channel = p_tc->TC_CHANNEL + ul_channel;
|
||||
return tc_channel->TC_SR;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief Set RA on the selected channel.
|
||||
*
|
||||
* \param tc Pointer to a TC instance.
|
||||
* \param chan Channel to configure.
|
||||
* \param v New value for RA.
|
||||
*/
|
||||
void TC_SetRA(Tc *tc, uint32_t chan, uint32_t v) {
|
||||
tc->TC_CHANNEL[chan].TC_RA = v;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief Set RB on the selected channel.
|
||||
*
|
||||
* \param tc Pointer to a TC instance.
|
||||
* \param chan Channel to configure.
|
||||
* \param v New value for RB.
|
||||
*/
|
||||
void TC_SetRB(Tc *tc, uint32_t chan, uint32_t v) {
|
||||
tc->TC_CHANNEL[chan].TC_RB = v;
|
||||
}
|
||||
|
||||
/**
|
||||
* \brief Set RC on the selected channel.
|
||||
*
|
||||
* \param tc Pointer to a TC instance.
|
||||
* \param chan Channel to configure.
|
||||
* \param v New value for RC.
|
||||
*/
|
||||
void TC_SetRC(Tc *tc, uint32_t chan, uint32_t v) {
|
||||
tc->TC_CHANNEL[chan].TC_RC = v;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user