Git-Mirrors/OpenModem
1
0
Fork 0
mirror of https://github.com/markqvist/OpenModem.git synced 2025-08-14 17:35:58 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Working

Browse source
This commit is contained in:
Mark Qvist 2014-04-03 22:21:37 +02:00
commit c898b090dd
1049 changed files with 288572 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

147
bertos/cpu/dsp56k/drv/timer_dsp56k.h Normal file
View file

@ -0,0 +1,147 @@
#error This code must be revised for the new timer API
/**
* \file
* <!--
* This file is part of BeRTOS.
*
* Bertos is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As a special exception, you may use this file as part of a free software
* library without restriction. Specifically, if other files instantiate
* templates or use macros or inline functions from this file, or you compile
* this file and link it with other files to produce an executable, this
* file does not by itself cause the resulting executable to be covered by
* the GNU General Public License. This exception does not however
* invalidate any other reasons why the executable file might be covered by
* the GNU General Public License.
*
* Copyright 2004 Develer S.r.l. (http://www.develer.com/)
* Copyright 2004 Giovanni Bajo
*
* -->
*
*
* \author Giovanni Bajo <rasky@develer.com>
*
* \brief Driver module for DSP56K
*/
/*#*
*#* $Log$
*#* Revision 1.10 2006/07/19 12:56:26 bernie
*#* Convert to new Doxygen style.
*#*
*#* Revision 1.9 2006/02/21 21:28:02 bernie
*#* New time handling based on TIMER_TICKS_PER_SEC to support slow timers with ticks longer than 1ms.
*#*
*#* Revision 1.8 2005/11/04 16:20:02 bernie
*#* Fix reference to README.devlib in header.
*#*
*#* Revision 1.7 2005/04/11 19:10:28 bernie
*#* Include top-level headers from cfg/ subdir.
*#*
*#* Revision 1.6 2004/11/16 22:37:14 bernie
*#* Replace IPTR with iptr_t.
*#*
*#* Revision 1.5 2004/08/25 14:12:08 rasky
*#* Aggiornato il comment block dei log RCS
*#*
*#* Revision 1.4 2004/07/30 14:27:49 rasky
*#* Aggiornati alcuni file DSP56k per la nuova libreria di IRQ management
*#*
*#* Revision 1.3 2004/06/06 18:30:34 bernie
*#* Import DSP56800 changes from SC.
*#*
*#* Revision 1.2 2004/06/03 11:27:09 bernie
*#* Add dual-license information.
*#*
*#* Revision 1.1 2004/05/23 18:23:30 bernie
*#* Import drv/timer module.
*#*
*#*/
#ifndef DRV_TIMER_DSP56K_H
#define DRV_TIMER_DSP56K_H
#include "timer.h"
#include <DSP56F807.h>
#include <cfg/compiler.h>
#include <hw.h>
#include <drv/irq.h>
// Calculate register pointer and irq vector from hw.h setting
#define REG_SYSTEM_TIMER PP_CAT(REG_TIMER_, SYSTEM_TIMER)
#define SYSTEM_TIMER_IRQ_VECTOR PP_CAT(IRQ_TIMER_, SYSTEM_TIMER)
/// Prescaler for the system timer
#define TIMER_PRESCALER 16
/// Frequency of the hardware high precision timer
#define TIMER_HW_HPTICKS_PER_SEC (IPBUS_FREQ / TIMER_PRESCALER)
/// Type of time expressed in ticks of the hardware high precision timer
typedef uint16_t hptime_t;
static void system_timer_isr(UNUSED(iptr_t, arg));
static void timer_hw_init(void)
{
uint16_t compare;
// Clear compare flag status and enable interrupt on compare
REG_SYSTEM_TIMER->SCR &= ~REG_TIMER_SCR_TCF;
REG_SYSTEM_TIMER->SCR |= REG_TIMER_SCR_TCFIE;
// Calculate the compare value needed to generate an interrupt exactly
// TICKS_PER_SEC times each second (usually, every millisecond). Check that
// the calculation is accurate, otherwise there is a precision error
// (probably the prescaler is too big or too small).
compare = TIMER_HW_HPTICKS_PER_SEC / TICKS_PER_SEC;
ASSERT((uint32_t)compare * TICKS_PER_SEC == IPBUS_FREQ / TIMER_PRESCALER);
REG_SYSTEM_TIMER->CMP1 = compare;
// The value for reload (at initializationa and after compare is met) is zero
REG_SYSTEM_TIMER->LOAD = 0;
// Set the interrupt handler and priority
irq_install(SYSTEM_TIMER_IRQ_VECTOR, &system_timer_isr, NULL);
irq_setpriority(SYSTEM_TIMER_IRQ_VECTOR, IRQ_PRIORITY_SYSTEM_TIMER);
// Small preprocessor trick to generate the REG_TIMER_CTRL_PRIMARY_IPBYNN macro
// needed to set the prescaler
#define REG_CONTROL_PRESCALER PP_CAT(REG_TIMER_CTRL_PRIMARY_IPBY, TIMER_PRESCALER)
// Setup the counter and start counting
REG_SYSTEM_TIMER->CTRL =
REG_TIMER_CTRL_MODE_RISING | // count rising edges (normal)
REG_CONTROL_PRESCALER | // frequency (IPbus / TIMER_PRESCALER)
REG_TIMER_CTRL_LENGTH; // up to CMP1, then reload
}
INLINE void timer_hw_irq(void)
{
// Clear the overflow flag so that we are ready for another interrupt
REG_SYSTEM_TIMER->SCR &= ~REG_TIMER_SCR_TCF;
}
INLINE hptime_t timer_hw_hpread(void)
{
return REG_SYSTEM_TIMER->CNTR;
}
#define DEFINE_TIMER_ISR \
static void system_timer_isr(UNUSED(iptr_t, arg))
#endif /* DRV_TIMER_DSP56_H */