blue-pill: fix linker scripts and asm led turnon

blue-pill/asm-blink/Makefile

@@ -0,0 +1,70 @@
+# configurables
+OBJS :=		
+TARGET :=	blink
+OBJS +=		$(TARGET).o
+
+# targets
+ELF :=		$(TARGET).elf
+BIN :=		$(TARGET).bin
+
+# toolchain setup
+ARMTC :=	arm-none-eabi
+CC :=		$(ARMTC)-gcc
+LD :=		$(ARMTC)-gcc
+AS :=		$(ARMTC)-as
+ARMSIZE :=	$(ARMTC)-size
+OBJCOPY :=	$(ARMTC)-objcopy
+PAGER ?=	less
+
+# compiler options
+CPUFLAGS :=	-mcpu=cortex-m3 -mthumb -std=c99
+CFLAGS :=	-Wall -Wextra -Os -MD $(CPUFLAGS) -g
+LDFLAGS :=	$(CPUFLAGS) -nostartfiles -Wl,-T,bluepill.ld
+LDLIBS :=	-lc -lnosys
+
+# programmer options
+STARTMEM :=	0x8000000
+
+# targets
+
+.PHONY: all
+all: $(BIN)
+
+$(ELF): $(OBJS)
+	$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
+	$(ARMSIZE) $@
+
+.PHONY: strip
+strip: $(ELF)
+	$(ARMTC)-strip $(ELF)
+	$(ARMSIZE) $(ELF)
+
+$(BIN): $(ELF)
+	$(OBJCOPY) -O binary $< $@
+
+.PHONY: flash
+flash: $(BIN)
+	st-flash write $(BIN) $(STARTMEM)
+
+.PHONY: erase
+erase:
+	st-flash erase
+
+.PHONY: reset
+reset:
+	st-flash reset
+
+.PHONY: install
+install: erase flash reset
+
+.PHONY: clean
+clean:
+	rm -f *.o *.bin *.elf *.d *.map
+
+.PHONY: disass
+disass: $(ELF)
+	$(ARMTC)-objdump -D $(ELF) | $(PAGER)
+
+.PHONY: dump
+dump: $(ELF)
+	$(ARMTC)-objcopy -D $(ELF) > $(TARGET).dump

blue-pill/asm-blink/blink.S

@@ -0,0 +1,43 @@
+.syntax unified
+.cpu cortex-m3
+.thumb
+
+.section .text
+.global	vectors
+vectors:
+.align	2
+.word	0
+.word	_start
+
+.thumb_func
+.global	_start
+_start:
+	/* enable port C clock */
+	ldr	r0,	=0x40021000
+	ldr	r1,	[r0, #0x18]
+	mov	r2,	#5
+	orr	r1,	r2
+	str	r1,	[r0, #0x18]
+
+	/*
+	 * enable output mode at a max of 2 MHz.
+	 * note that the default is a general purpose output push-pull,
+	 * which is what it should be.
+	 */
+	ldr	r0,	=0x40011000
+	ldr	r1,	[r0, #0x04]
+	mov	r2,	#0x02
+	lsl	r2,	#0x14
+	orr	r1,	r2
+	str	r1,	[r0, #0x04]
+
+	/* write LED pin (PC13) */
+	ldr	r0,	=0x40011000
+	ldr	r1,	[r0, #0x10]
+	mov	r2,	#0x01
+	lsl	r2,	#0x0d
+	lsl	r2,	#0x10
+	orr	r1,	r2
+	str	r1,	[r0, #0x10]
+
+hang:	bl .

blue-pill/asm-blink/bluepill.ld

@@ -0,0 +1,18 @@
+MEMORY
+{
+    flash (rx) : ORIGIN = 0x08000000, LENGTH = 64K
+    sram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+EXTERN(vectors);
+ENTRY(_start);
+
+SECTIONS
+{
+	.text : {
+		*(.vectors*)
+ 		*(.text*)
+		. = ALIGN(4);
+	} > flash
+	.bss  : { *(.bss*) } > sram
+}

blue-pill/draugr/startup.s

@@ -9,6 +9,8 @@
 .cpu cortex-m3
 .thumb
 
+.section	.text
+.global vectors
 vectors:
 .align	2
 .long	0x20005000		/* stack pointer points to top of SRAM */

blue-pill/draugr/stm32f103.ld

@@ -1,11 +1,18 @@
 MEMORY
 {
-    flash (rx) : ORIGIN = 0x00000000, LENGTH = 128K
+    flash (rx) : ORIGIN = 0x08000000, LENGTH = 64K
     sram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
 }
 
+EXTERN(vectors);
+ENTRY(reset_handler);
+
 SECTIONS
 {
-   .text : { *(.text*) } > flash
+	.text : {
+		*(.vectors*)
+ 		*(.text*)
+		. = ALIGN(4);
+	} > flash
 	.bss  : { *(.bss*) } > sram
 }