Add logic to initialize timer 2
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@34 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
parent
b41f8cccc4
commit
7b93c5cd57
@ -79,7 +79,7 @@
|
||||
************************************************************/
|
||||
|
||||
/************************************************************
|
||||
* Function: timer_isr
|
||||
* Function: up_timerisr
|
||||
*
|
||||
* Description:
|
||||
* The timer ISR will perform a variety of services for
|
||||
@ -115,6 +115,15 @@ int up_timerisr(int irq, uint32 *regs)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/************************************************************
|
||||
* Function: up_timerinit
|
||||
*
|
||||
* Description:
|
||||
* This function is called during start-up to initialize
|
||||
* the timer interrupt.
|
||||
*
|
||||
************************************************************/
|
||||
|
||||
void up_timerinit(void)
|
||||
{
|
||||
uint32 val;
|
||||
|
||||
@ -66,33 +66,57 @@ LDLIBS = $(addprefix -l,$(notdir $(LINKLIBS)))
|
||||
|
||||
LDFLAGS = --model-large --nostdlib \
|
||||
--data-loc 0x30 --iram-size 0x100 \
|
||||
--code-loc 0x2040 --code-size 0x5fc0 \
|
||||
--code-loc 0x20c0 --code-size 0x5f40 \
|
||||
--xram-loc 0x0100 --xram-size 0x1f00
|
||||
|
||||
HEAP_START = ${shell cat pass1.mem | grep "EXTERNAL RAM" | sed -e "s/[ ][ ]*/ /g" | cut -d' ' -f5}
|
||||
|
||||
DEPSRCS = $(SRCS) $(LINKSSRCS)
|
||||
|
||||
HEAP1_BASE = ${shell cat pass1.mem | grep "EXTERNAL RAM" | sed -e "s/[ ][ ]*/ /g" | cut -d' ' -f5}
|
||||
HEAP2_BASE = ${shell cat pass1.mem | grep "ROM/EPROM/FLASH" | sed -e "s/[ ][ ]*/ /g" | cut -d' ' -f4}
|
||||
STACK_BASE = ${shell cat pass1.mem | grep "Stack starts" | cut -d' ' -f4}
|
||||
|
||||
all: up_head$(OBJEXT) libarch$(LIBEXT)
|
||||
|
||||
$(ASRCS) $(LINKASRCS): %$(ASMEXT): %.S
|
||||
$(CPP) -P $(CPPFLAGS) -D__ASSEMBLY__ -DUP_HEAP_START=0x0100 -DUP_HEAP_END=0x2000 $< -o $@
|
||||
$(CPP) -P $(CPPFLAGS) -D__ASSEMBLY__ $< -o $@
|
||||
|
||||
$(AOBJS) $(LINKOBJS): $(ASRCS) $(LINKASRCS)
|
||||
$(AS) $(ASFLAGS) $<
|
||||
|
||||
$(COBJS): %$(OBJEXT): %.c
|
||||
$(CC) -c $(CFLAGS) -DUP_HEAP_START=0x0100 -DUP_HEAP_END=0x2000 $< -o $@
|
||||
$(CC) -c $(CFLAGS) $< -o $@
|
||||
|
||||
# Create a header file that contains addressing information needed by the code
|
||||
|
||||
pass1.mem:
|
||||
|
||||
up_mem.h: pass1.mem
|
||||
@echo "#ifndef __ARCH_MEM_H" >up_mem.h
|
||||
@echo "#define __ARCH_MEM_H" >>up_mem.h
|
||||
@if [ -e pass1.mem ]; then \
|
||||
echo "#define UP_STACK_BASE $(STACK_BASE)" >>up_mem.h ; \
|
||||
echo "#define UP_HEAP1_BASE $(HEAP1_BASE)" >> up_mem.h ; \
|
||||
echo "#define UP_HEAP1_END 0x2000" >> up_mem.h ; \
|
||||
echo "#define UP_HEAP2_BASE $(HEAP2_BASE)" >> up_mem.h ; \
|
||||
echo "#define UP_HEAP2_END 0x8000" >> up_mem.h ; \
|
||||
else \
|
||||
echo "#define UP_STACK_BASE 0x30" >>up_mem.h ; \
|
||||
echo "#define UP_HEAP1_BASE 0x0100" >> up_mem.h ; \
|
||||
echo "#define UP_HEAP1_END 0x2000" >> up_mem.h ; \
|
||||
echo "#define UP_HEAP2_BASE 0x6000" >> up_mem.h ; \
|
||||
echo "#define UP_HEAP2_END 0x8000" >> up_mem.h ; \
|
||||
fi
|
||||
@echo "#endif /* __ARCH_MEM_H */" >>up_mem.h
|
||||
|
||||
# Combine all objects in this directory into a library
|
||||
|
||||
libarch$(LIBEXT): $(OBJS)
|
||||
( for obj in $(OBJS) ; do \
|
||||
libarch$(LIBEXT): up_mem.h $(OBJS)
|
||||
@( for obj in $(OBJS) ; do \
|
||||
$(AR) $@ $${obj} || \
|
||||
{ echo "$(AR) $@ $${obj} FAILED!" ; exit 1 ; } ; \
|
||||
done ; )
|
||||
|
||||
# This is a kludge to work around some conflicting symbols in libsdcc.lib
|
||||
# This is a kludge to work around some conflicting symbols in libsdcc.liXqueb
|
||||
|
||||
$(SDCCLIBDIR)/libmysdcc.lib: $(SDCCLIBDIR)/libsdcc.lib
|
||||
@cat $(SDCCLIBDIR)/libsdcc.lib | \
|
||||
@ -106,27 +130,31 @@ $(SDCCLIBDIR)/libmysdcc.lib: $(SDCCLIBDIR)/libsdcc.lib
|
||||
|
||||
# This target builds the final executable
|
||||
|
||||
pass1$(EXEEXT): $(SDCCLIBDIR)/libmysdcc.lib $(LINKOBJS)
|
||||
$(CC) $(LDFLAGS) $(LDPATHES) $(SDCCPATH) $(LINKOBJS) $(LDLIBS) $(SDCCLIBS) -o pass1.ihx
|
||||
pass1.ihx: up_mem.h $(SDCCLIBDIR)/libmysdcc.lib $(LINKOBJS)
|
||||
$(CC) $(LDFLAGS) $(LDPATHES) $(SDCCPATH) $(LINKOBJS) $(LDLIBS) $(SDCCLIBS) -o $@
|
||||
@rm -f up_mem.h
|
||||
@rm -f up_allocateheap$(OBJEXT) libarch$(LIBEXT)
|
||||
@$(MAKE) TOPDIR=$(TOPDIR) libarch$(LIBEXT)
|
||||
|
||||
nuttx$(EXEEXT): pass1$(EXEEXT)
|
||||
$(CC) -c $(CFLAGS) -DUP_HEAP_START=$(HEAP_START) -DUP_HEAP_END=0x2000 \
|
||||
up_allocateheap.c -o up_allocateheap$(OBJEXT)
|
||||
nuttx.ihx: up_mem.h $(SDCCLIBDIR)/libmysdcc.lib $(LINKOBJS)
|
||||
$(CC) $(LDFLAGS) $(LDPATHES) $(SDCCPATH) $(LINKOBJS) $(LDLIBS) $(SDCCLIBS) -o $@
|
||||
|
||||
nuttx$(EXEEXT): pass1.ihx nuttx.ihx
|
||||
@rm -f pass1.*
|
||||
$(CC) $(LDFLAGS) $(LDPATHES) $(SDCCPATH) $(LINKOBJS) $(LDLIBS) $(SDCCLIBS) -o nuttx.ihx
|
||||
packihx nuttx.ihx > $(TOPDIR)/nuttx$(EXEEXT)
|
||||
@cp -f nuttx.map $(TOPDIR)/.
|
||||
|
||||
# Build dependencies
|
||||
|
||||
.depend: Makefile $(DEPSRCS)
|
||||
.depend: Makefile up_mem.h $(DEPSRCS)
|
||||
$(MKDEP) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
|
||||
touch $@
|
||||
|
||||
depend: .depend
|
||||
|
||||
clean:
|
||||
rm -f libarch$(LIBEXT) *.asm *.rel *.lst *.rst *.sym *.adb *.lnk *.map *.mem *.ihx *.hex *~
|
||||
rm -f libarch$(LIBEXT) up_mem.h
|
||||
rm -f *.asm *.rel *.lst *.rst *.sym *.adb *.lnk *.map *.mem *.ihx *.hex *~
|
||||
if [ ! -z "$(OBJEXT)" ]; then rm -f *$(OBJEXT); fi
|
||||
|
||||
distclean: clean
|
||||
|
||||
@ -44,6 +44,7 @@
|
||||
#include <nuttx/arch.h>
|
||||
#include "os_internal.h"
|
||||
#include "up_internal.h"
|
||||
#include "up_mem.h"
|
||||
|
||||
/************************************************************
|
||||
* Private Definitions
|
||||
@ -74,6 +75,6 @@
|
||||
|
||||
void up_allocate_heap(FAR void **heap_start, size_t *heap_size)
|
||||
{
|
||||
*heap_start = (FAR void*)UP_HEAP_START;
|
||||
*heap_size = UP_HEAP_END - UP_HEAP_START;
|
||||
*heap_start = (FAR void*)UP_HEAP1_BASE;
|
||||
*heap_size = UP_HEAP1_END - UP_HEAP1_BASE;
|
||||
}
|
||||
|
||||
@ -96,6 +96,59 @@
|
||||
#define PM2_VECTOR_UART (PM2_VECTOR_BASE + 35)
|
||||
#define PM2_VECTOR_TIMER2 (PM2_VECTOR_BASE + 43)
|
||||
|
||||
/* Registers. 8052 regiser definitions are provided in the SDCC header
|
||||
* file 8052.h. However, a few SFR registers are missing from that
|
||||
* file (they can be found in mcs51reg.h, but that file is too much
|
||||
* when the following simple addtions do the job).
|
||||
*/
|
||||
|
||||
sfr at 0xc9 T2MOD ;
|
||||
|
||||
/* Timing information.
|
||||
*
|
||||
* The PJRC board is based on a standard 87C52 CPU clocked at 22.1184 MHz.
|
||||
* The CPU clock is divided by 12 to yield a clock frequency of 1.8432 MHz.
|
||||
*/
|
||||
|
||||
#define CPU_CLOCK_HZ 22118400L
|
||||
#define TIMER_CLOCK_HZ 1843200L
|
||||
|
||||
/* The 87C52 has three timers, timer 0, timer 1, and timer 2. On the PJRC
|
||||
* board, timer 1 and 2 have dedicated functions. They provide baud support
|
||||
* support for the boards two serial ports. Unfortunately, only timer 2
|
||||
* can generate the accurate 100Hz timer desired by the OS.
|
||||
*
|
||||
* Timer 0 provides only a 8-bit auto-reload mode.
|
||||
*/
|
||||
|
||||
#define CONFIG_80C52_TIMER2 1
|
||||
#ifdef CONFIG_80C52_TIMER2
|
||||
|
||||
/* To use timer 2 as the 100Hz system timer, we need to calculate a 16-bit
|
||||
* reload value that results in 100Hz overflow interrupts. That value
|
||||
* is given by:
|
||||
*
|
||||
* Timer ticks = TIMER_CLOCK_HZ / (desired ticks-per-second)
|
||||
* = 18432
|
||||
* Capture value = 0xffff - (Timer ticks)
|
||||
* = 47103 = 0x67ff
|
||||
*/
|
||||
|
||||
# define TIMER2_CAPTURE_LOW 0xff
|
||||
# define TIMER2_CAPTURE_HIGH 0x67
|
||||
|
||||
#else
|
||||
|
||||
/* Timer 0, mode 0 can be used as a system timer. In that mode, the
|
||||
* 1.8432 is further divided by 32. A single 8-bit value is incremented
|
||||
* at 57600 Hz, which results in 225 Timer 0 overflow interrupts per
|
||||
* second.
|
||||
*/
|
||||
|
||||
# warning "No support for timer 0 as the system timer"
|
||||
|
||||
#endif
|
||||
|
||||
/**************************************************************************
|
||||
* Public Types
|
||||
**************************************************************************/
|
||||
|
||||
@ -41,6 +41,7 @@
|
||||
#include <sys/types.h>
|
||||
#include <debug.h>
|
||||
#include <nuttx/arch.h>
|
||||
#include <8052.h>
|
||||
#include "clock_internal.h"
|
||||
#include "up_internal.h"
|
||||
|
||||
@ -61,7 +62,7 @@
|
||||
************************************************************/
|
||||
|
||||
/************************************************************
|
||||
* Function: timer_isr
|
||||
* Function: up_timerisr
|
||||
*
|
||||
* Description:
|
||||
* The timer ISR will perform a variety of services for
|
||||
@ -77,15 +78,45 @@ int up_timerisr(int irq, FAR ubyte *frame)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/************************************************************
|
||||
* Function: up_timerinit
|
||||
*
|
||||
* Description:
|
||||
* This function is called during start-up to initialize
|
||||
* the timer interrupt.
|
||||
*
|
||||
************************************************************/
|
||||
|
||||
void up_timerinit(void)
|
||||
{
|
||||
#ifdef CONFIG_80C52_TIMER2
|
||||
up_disable_irq(TIMER2_IRQ);
|
||||
|
||||
#warning "Missing TIMER2 setup logic here"
|
||||
/* Set up timer 2 -- See up_internal.h for details */
|
||||
|
||||
T2MOD = 0;
|
||||
|
||||
/* Set up the capture count to generate 100Hz system
|
||||
* interrupts.
|
||||
*/
|
||||
|
||||
RCAP2L = TIMER2_CAPTURE_LOW;
|
||||
RCAP2H = TIMER2_CAPTURE_HIGH;
|
||||
|
||||
TL2 = TIMER2_CAPTURE_LOW;
|
||||
TH2 = TIMER2_CAPTURE_HIGH;
|
||||
|
||||
/* Configure for interrupts */
|
||||
|
||||
T2CON = 0x40;
|
||||
|
||||
/* Attach and enable the timer interrupt */
|
||||
|
||||
irq_attach(TIMER2_IRQ, (xcpt_t)up_timerisr);
|
||||
up_enable_irq(TIMER2_IRQ);
|
||||
|
||||
#else
|
||||
# warning "No support for timer 0 as the system timer"
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user