Just got a B+ board, led is on a different pin, starting to port exam…

…ples

beeplus/README

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+
+This directory is specific to the Raspberry Pi B+ board, which has
+changed a little from the A and B boards, first thing is the led has
+changed from GPIO16 to GPIO47.
+
+As of this writing the schematics are not available so will have to
+figure things out along the way...

beeplus/blinker01/Makefile

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+
+ARMGNU ?= arm-none-eabi
+
+AOPS = --warn --fatal-warnings 
+COPS = -Wall -Werror -O2 -nostdlib -nostartfiles -ffreestanding 
+
+
+
+gcc : blinker01.hex blinker01.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
+
+blinker01.o : blinker01.c
+	$(ARMGNU)-gcc $(COPS) -c blinker01.c -o blinker01.o
+
+blinker01.elf : memmap vectors.o blinker01.o 
+	$(ARMGNU)-ld vectors.o blinker01.o -T memmap -o blinker01.elf
+	$(ARMGNU)-objdump -D blinker01.elf > blinker01.list
+
+blinker01.bin : blinker01.elf
+	$(ARMGNU)-objcopy blinker01.elf -O binary blinker01.bin
+
+blinker01.hex : blinker01.elf
+	$(ARMGNU)-objcopy blinker01.elf -O ihex blinker01.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
+
+clang : blinker01.clang.hex blinker01.clang.bin
+
+
+blinker01.clang.bc : blinker01.c
+	clang $(LOPS) -c blinker01.c -o blinker01.clang.bc
+
+blinker01.clang.opt.elf : memmap vectors.o blinker01.clang.bc
+	opt $(OOPS) blinker01.clang.bc -o blinker01.clang.opt.bc
+	llc $(LLCOPS) blinker01.clang.opt.bc -o blinker01.clang.opt.s
+	$(ARMGNU)-as blinker01.clang.opt.s -o blinker01.clang.opt.o
+	$(ARMGNU)-ld -o blinker01.clang.opt.elf -T memmap vectors.o blinker01.clang.opt.o
+	$(ARMGNU)-objdump -D blinker01.clang.opt.elf > blinker01.clang.opt.list
+
+blinker01.clang.hex : blinker01.clang.opt.elf
+	$(ARMGNU)-objcopy blinker01.clang.opt.elf blinker01.clang.hex -O ihex
+
+blinker01.clang.bin : blinker01.clang.opt.elf
+	$(ARMGNU)-objcopy blinker01.clang.opt.elf blinker01.clang.bin -O binary
+
+

beeplus/blinker01/README

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+
+See the top level README for information on where to find the
+schematic and programmers reference manual for the ARM processor
+on the raspberry pi.  Also find information on how to load and run
+these programs.
+
+This simple example sets up a small stack, not much to this program
+so the stack doesnt need much room.  It then enables gpio47 as
+an output.  Then goes into a loop that sets the gpio, waits, resets it,
+waits, repeat.  gpio47 is shown on the schematic to connect to the OK
+led.  One of the bank of leds on the corner near the audio out and host
+usb ports.  The blink rate for me is a few blinks a second perhaps.
+
+I normally set my stack pointer to be at the top of some bank of ram
+if only one ram bank in the system then the top of that ram bank.  See
+the top level README, they force us to start somewhere other than zero
+so for such simple programs like these I am setting the program to start
+at 0x8000 and the stack to start at 0x7FFC.  Note that on an ARM the
+stack pointer (r13) points at the first address after the top of the
+stack so setting r13 to 0x8000 means the stack starts at 0x7FFC and
+works down away from our program.
+
+vectors.s is the entry point for this program, even an application on
+an operating system like linux has some assembly up front before
+calling the main function.  For this processor the minimum is to to
+set up the stack pointer and call the main function.  Because some
+compilers add extra stuff if they see a main() funtion I use some
+function name other than main() typically for embedded systems like this.
+If you dont have any pre-initialized variables, and dont assume that
+un-initialized variables are zero, then you dont have or need a .data
+and wont need to zero .bss.  Typically the asm that preceeds the call
+to the main function would prepare the .data segment if needed and zero
+the .bss segment.  Also the linker script is usually more complicated
+to initialize global variables with the addresses and sizes of the
+segments.  I dont do these things so my startup code only needs to
+set the stack pointer and branch to the main function.
+
+The example includes a Makefile that is capable of building using
+gnu/gcc tools or a hybrid clang(llvm)/gnu binutils to experience an
+alternate C compiler.
+
+The reason for the dummy function is that when a compiler optimizes
+code like this:
+
+for(ra=0;ra<0x1000;ra++) continue;
+
+It replaces it with this equivalent:
+
+ra = 0x1000;
+
+Which we dont want, we want the program to actually burn some time so
+we can see the led with our slow eyes.
+
+The compiler doesnt know what dummy does because the asm for it is not
+something the C compiler can inspect.  So
+
+for(ra=0;ra<0x1000;ra++) dummy(ra);
+
+To properly implement your program the C compiler must in order call
+dummy(0), dummy(1), dummy(2), etc.  For smaller loops it may choose
+to unroll the loop. that is fine.
+
+Another solution is to declare ra volatile and that will cause first
+the loop to not get optimized, and ra to be read from and saved to memory
+each time through the loop.  I like one approach you may like another.
+
+The program is simple refer to the broadcom arm document for information
+on these registers.  Remember that in the broadcom document the addresses
+will be 0x7Exxxxxx not 0x20xxxxxx.
+

beeplus/blinker01/blinker01.c

@@ -0,0 +1,51 @@
+
+//-------------------------------------------------------------------------
+//-------------------------------------------------------------------------
+
+extern void PUT32 ( unsigned int, unsigned int );
+extern unsigned int GET32 ( unsigned int );
+extern void dummy ( unsigned int );
+
+#define GPFSEL1 0x20200004
+#define GPFSEL2 0x20200008
+#define GPFSEL3 0x2020000C
+#define GPFSEL4 0x20200010
+#define GPSET0  0x2020001C
+#define GPSET1  0x20200020
+#define GPCLR0  0x20200028
+#define GPCLR1  0x2020002C
+
+//-------------------------------------------------------------------------
+int notmain ( void )
+{
+    unsigned int ra;
+
+    ra=GET32(GPFSEL4);
+    ra&=~(7<<21);
+    ra|=1<<21;
+    PUT32(GPFSEL4,ra);
+
+    while(1)
+    {
+        PUT32(GPSET1,1<<(47-32));
+        for(ra=0;ra<0x100000;ra++) dummy(ra);
+        PUT32(GPCLR1,1<<(47-32));
+        for(ra=0;ra<0x100000;ra++) dummy(ra);
+    }
+    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.
+//
+//-------------------------------------------------------------------------

beeplus/blinker01/blinker01.hex

@@ -0,0 +1,12 @@
+:1080000002D9A0E3050000EBFEFFFFEA001080E5C7
+:108010001EFF2FE1000090E51EFF2FE11EFF2FE164
+:1080200010402DE95C009FE5F9FFFFEB0E16C0E361
+:10803000021681E34C009FE5F3FFFFEB48009FE54C
+:108040000219A0E3F0FFFFEB0040A0E30400A0E171
+:10805000014084E2F0FFFFEB010654E3FAFFFF1A50
+:1080600028009FE50219A0E3E7FFFFEB0040A0E333
+:108070000400A0E1014084E2E7FFFFEB010654E3C6
+:10808000FAFFFF1AECFFFFEA10002020200020205A
+:048090002C00202080
+:040000030000800079
+:00000001FF

beeplus/blinker01/blinker01.list

@@ -0,0 +1,79 @@
+
+blinker01.elf:     file format elf32-littlearm
+
+
+Disassembly of section .text:
+
+00008000 <_start>:
+    8000:	e3a0d902 	mov	sp, #32768	; 0x8000
+    8004:	eb000005 	bl	8020 <notmain>
+
+00008008 <hang>:
+    8008:	eafffffe 	b	8008 <hang>
+
+0000800c <PUT32>:
+    800c:	e5801000 	str	r1, [r0]
+    8010:	e12fff1e 	bx	lr
+
+00008014 <GET32>:
+    8014:	e5900000 	ldr	r0, [r0]
+    8018:	e12fff1e 	bx	lr
+
+0000801c <dummy>:
+    801c:	e12fff1e 	bx	lr
+
+00008020 <notmain>:
+    8020:	e92d4010 	push	{r4, lr}
+    8024:	e59f005c 	ldr	r0, [pc, #92]	; 8088 <notmain+0x68>
+    8028:	ebfffff9 	bl	8014 <GET32>
+    802c:	e3c0160e 	bic	r1, r0, #14680064	; 0xe00000
+    8030:	e3811602 	orr	r1, r1, #2097152	; 0x200000
+    8034:	e59f004c 	ldr	r0, [pc, #76]	; 8088 <notmain+0x68>
+    8038:	ebfffff3 	bl	800c <PUT32>
+    803c:	e59f0048 	ldr	r0, [pc, #72]	; 808c <notmain+0x6c>
+    8040:	e3a01902 	mov	r1, #32768	; 0x8000
+    8044:	ebfffff0 	bl	800c <PUT32>
+    8048:	e3a04000 	mov	r4, #0
+    804c:	e1a00004 	mov	r0, r4
+    8050:	e2844001 	add	r4, r4, #1
+    8054:	ebfffff0 	bl	801c <dummy>
+    8058:	e3540601 	cmp	r4, #1048576	; 0x100000
+    805c:	1afffffa 	bne	804c <notmain+0x2c>
+    8060:	e59f0028 	ldr	r0, [pc, #40]	; 8090 <notmain+0x70>
+    8064:	e3a01902 	mov	r1, #32768	; 0x8000
+    8068:	ebffffe7 	bl	800c <PUT32>
+    806c:	e3a04000 	mov	r4, #0
+    8070:	e1a00004 	mov	r0, r4
+    8074:	e2844001 	add	r4, r4, #1
+    8078:	ebffffe7 	bl	801c <dummy>
+    807c:	e3540601 	cmp	r4, #1048576	; 0x100000
+    8080:	1afffffa 	bne	8070 <notmain+0x50>
+    8084:	eaffffec 	b	803c <notmain+0x1c>
+    8088:	20200010 	eorcs	r0, r0, r0, lsl r0
+    808c:	20200020 	eorcs	r0, r0, r0, lsr #32
+    8090:	2020002c 	eorcs	r0, r0, ip, lsr #32
+
+Disassembly of section .ARM.attributes:
+
+00000000 <.ARM.attributes>:
+   0:	00002a41 	andeq	r2, r0, r1, asr #20
+   4:	61656100 	cmnvs	r5, r0, lsl #2
+   8:	01006962 	tsteq	r0, r2, ror #18
+   c:	00000020 	andeq	r0, r0, r0, lsr #32
+  10:	4d524105 	ldfmie	f4, [r2, #-20]	; 0xffffffec
+  14:	54347620 	ldrtpl	r7, [r4], #-1568	; 0x620
+  18:	08020600 	stmdaeq	r2, {r9, sl}
+  1c:	12010901 	andne	r0, r1, #16384	; 0x4000
+  20:	15011404 	strne	r1, [r1, #-1028]	; 0x404
+  24:	18031701 	stmdane	r3, {r0, r8, r9, sl, ip}
+  28:	Address 0x0000000000000028 is out of bounds.
+
+
+Disassembly of section .comment:
+
+00000000 <.comment>:
+   0:	3a434347 	bcc	10d0d24 <notmain+0x10c8d04>
+   4:	4e472820 	cdpmi	8, 4, cr2, cr7, cr0, {1}
+   8:	34202955 	strtcc	r2, [r0], #-2389	; 0x955
+   c:	332e382e 	teqcc	lr, #3014656	; 0x2e0000
+	...

beeplus/blinker01/memmap

@@ -0,0 +1,11 @@
+
+MEMORY
+{
+    ram : ORIGIN = 0x8000, LENGTH = 0x10000
+}
+
+SECTIONS
+{
+    .text : { *(.text*) } > ram
+    .bss : { *(.bss*) } > ram
+}

beeplus/blinker01/vectors.s

@@ -0,0 +1,39 @@
+
+;@ ------------------------------------------------------------------
+;@ ------------------------------------------------------------------
+
+.globl _start
+_start:
+    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.
+;@
+;@-------------------------------------------------------------------------