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