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adding pi2 blinker02 in svc mode

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dwelch
2016-03-27 13:30:22 -04:00
parent eb8aaccfaf
commit e7b38caffb
5 changed files with 225 additions and 0 deletions
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67
boards/pi2/SVC/blinker02/Makefile Normal file
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ARMGNU ?= arm-none-eabi
COPS = -Wall -O2 -nostdlib -nostartfiles -ffreestanding
gcc : blinker02.hex blinker02.bin
all : gcc clang
clean :
rm -f *.o
rm -f *.bin
rm -f *.hex
rm -f *.elf
rm -f *.list
rm -f *.img
rm -f *.bc
rm -f *.clang.opt.s
vectors.o : vectors.s
$(ARMGNU)-as vectors.s -o vectors.o
blinker02.o : blinker02.c
$(ARMGNU)-gcc $(COPS) -c blinker02.c -o blinker02.o
blinker02.elf : memmap vectors.o blinker02.o
$(ARMGNU)-ld vectors.o blinker02.o -T memmap -o blinker02.elf
$(ARMGNU)-objdump -D blinker02.elf > blinker02.list
blinker02.bin : blinker02.elf
$(ARMGNU)-objcopy blinker02.elf -O binary blinker02.bin
blinker02.hex : blinker02.elf
$(ARMGNU)-objcopy blinker02.elf -O ihex blinker02.hex
LOPS = -Wall -m32 -emit-llvm
LLCOPS = -march=arm -mcpu=arm1176jzf-s
LLCOPS0 = -march=arm
LLCOPS1 = -march=arm -mcpu=arm1176jzf-s
COPS = -Wall -O2 -nostdlib -nostartfiles -ffreestanding
#OOPS = -std-compile-opts
OOPS = -std-link-opts
clang : blinker02.clang.hex blinker02.clang.bin
blinker02.clang.bc : blinker02.c
clang $(LOPS) -c blinker02.c -o blinker02.clang.bc
blinker02.clang.opt.elf : memmap vectors.o blinker02.clang.bc
opt $(OOPS) blinker02.clang.bc -o blinker02.clang.opt.bc
llc $(LLCOPS) blinker02.clang.opt.bc -o blinker02.clang.opt.s
$(ARMGNU)-as blinker02.clang.opt.s -o blinker02.clang.opt.o
$(ARMGNU)-ld -o blinker02.clang.opt.elf -T memmap vectors.o blinker02.clang.opt.o
$(ARMGNU)-objdump -D blinker02.clang.opt.elf > blinker02.clang.opt.list
blinker02.clang.hex : blinker02.clang.opt.elf
$(ARMGNU)-objcopy blinker02.clang.opt.elf blinker02.clang.hex -O ihex
blinker02.clang.bin : blinker02.clang.opt.elf
$(ARMGNU)-objcopy blinker02.clang.opt.elf blinker02.clang.bin -O binary

27
boards/pi2/SVC/blinker02/README Normal file
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See the top level README for information on where to find documentation
for the raspberry pi and the ARM processor inside. Also find information
on how to load and run these programs.
This example is for the pi2, see other directories for other flavors
of raspberry pi. This example switches back to SVC mode from HYP mode.
There is a free-running 64 bit timer, super easy to use, just read it.
//0x01000000 17 seconds
//0x00400000 4 seconds
//#define TIMER_BIT 0x01000000
#define TIMER_BIT 0x00400000
I think what they are doing is using a 1GHz clock for the ARM core
(and GPU?) That is divided by 4 to get the 250MHz system clock (and
or there is a 250MHz reference clock that is multiplied by 4). Either
way there is a 250MHz system clock, and my guess is this is divided by
256 to get 977KHz. 0x01000000 ticks would be 17.18 seconds and I am
using a watch with a second hand, so very plausible.
Can change the TIMER_BIT to a different one to change the blink rate
of the LED for example try:
#define TIMER_BIT 0x00100000

68
boards/pi2/SVC/blinker02/blinker02.c Normal file
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//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
extern void PUT32 ( unsigned int, unsigned int );
extern unsigned int GET32 ( unsigned int );
extern void dummy ( unsigned int );
#define SYSTIMERCLO 0x3F003004
#define GPFSEL3 0x3F20000C
#define GPFSEL4 0x3F200010
#define GPSET1 0x3F200020
#define GPCLR1 0x3F20002C
//0x01000000 17 seconds
//0x00400000 4 seconds
//#define TIMER_BIT 0x01000000
#define TIMER_BIT 0x00400000
//-------------------------------------------------------------------------
int notmain ( void )
{
unsigned int ra;
ra=GET32(GPFSEL4);
ra&=~(7<<21);
ra|=1<<21;
PUT32(GPFSEL4,ra);
ra=GET32(GPFSEL3);
ra&=~(7<<15);
ra|=1<<15;
PUT32(GPFSEL3,ra);
while(1)
{
PUT32(GPSET1,1<<(47-32));
PUT32(GPCLR1,1<<(35-32));
while(1)
{
ra=GET32(SYSTIMERCLO);
if((ra&=TIMER_BIT)==TIMER_BIT) break;
}
PUT32(GPCLR1,1<<(47-32));
PUT32(GPSET1,1<<(35-32));
while(1)
{
ra=GET32(SYSTIMERCLO);
if((ra&=TIMER_BIT)==0) break;
}
}
return(0);
}
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//
// Copyright (c) 2012 David Welch dwelch@dwelch.com
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//-------------------------------------------------------------------------

11
boards/pi2/SVC/blinker02/memmap Normal file
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MEMORY
{
ram : ORIGIN = 0x8000, LENGTH = 0x1000
}
SECTIONS
{
.text : { *(.text*) } > ram
.bss : { *(.bss*) } > ram
}

52
boards/pi2/SVC/blinker02/vectors.s Normal file
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;@ ------------------------------------------------------------------
;@ ------------------------------------------------------------------
.globl _start
_start:
;@ b skip
mrs r0,cpsr
and r1,r0,#0x1F
cmp r1,#0x1A
bne skip
bic r0,r0,#0x1F
orr r0,r0,#0x13
msr spsr_cxsf,r0
add r0,pc,#4
msr ELR_hyp,r0 ;@ .word 0xe12ef300
eret ;@ .word 0xe160006e
skip:
mov sp,#0x8000
bl notmain
hang: b hang
.globl PUT32
PUT32:
str r1,[r0]
bx lr
.globl GET32
GET32:
ldr r0,[r0]
bx lr
.globl dummy
dummy:
bx lr
;@ ------------------------------------------------------------------
;@ ------------------------------------------------------------------
;@-------------------------------------------------------------------------
;@
;@ Copyright (c) 2012 David Welch dwelch@dwelch.com
;@
;@ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
;@
;@ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
;@
;@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
;@
;@-------------------------------------------------------------------------