From 71eb73967b02e3a47bf764371340a43ae17af9f8 Mon Sep 17 00:00:00 2001
From: Kyle Isom <kyle@imap.cc>
Date: Mon, 5 Mar 2018 23:07:29 -0800
Subject: [PATCH] Start bluepill skeleton and blinky project.

---
 blue-pill/blinky/Makefile      | 52 ++++++++++++++++++++++++++++++++
 blue-pill/blinky/blinky.c      | 55 ++++++++++++++++++++++++++++++++++
 blue-pill/blinky/bluepill.ld   | 19 ++++++++++++
 blue-pill/pins.txt             | 12 ++++++++
 blue-pill/skeleton/Makefile    | 52 ++++++++++++++++++++++++++++++++
 blue-pill/skeleton/bluepill.ld | 19 ++++++++++++
 6 files changed, 209 insertions(+)
 create mode 100644 blue-pill/blinky/Makefile
 create mode 100644 blue-pill/blinky/blinky.c
 create mode 100644 blue-pill/blinky/bluepill.ld
 create mode 100644 blue-pill/pins.txt
 create mode 100644 blue-pill/skeleton/Makefile
 create mode 100644 blue-pill/skeleton/bluepill.ld

diff --git a/blue-pill/blinky/Makefile b/blue-pill/blinky/Makefile
new file mode 100644
index 0000000..ce23de3
--- /dev/null
+++ b/blue-pill/blinky/Makefile
@@ -0,0 +1,52 @@
+# configurables
+OBJS :=		blinky.o
+TARGET :=	blinky
+
+# targets
+ELF :=		$(TARGET).elf
+BIN :=		$(TARGET).bin
+
+# toolchain setup
+ARMTC :=	arm-none-eabi
+ARMCC :=	$(ARMTC)-gcc
+CC :=		$(ARMCC)
+LD :=		$(ARMCC)
+ARMSIZE :=	$(ARMTC)-size
+OBJCOPY :=	$(ARMTC)-objcopy
+
+# compiler options
+CPUFLAGS :=	-mcpu=cortex-m3 -mthumb
+CFLAGS :=	-Wall -Wextra -Os -MD $(CPUFLAGS)
+LDFLAGS :=	$(CPUFLAGS) -nostartfiles -Wl,-T,bluepill.ld
+LDLIBS :=	-lc -lnosys
+
+# programmer options
+STARTMEM :=	0x8000000
+
+# targets
+
+.PHONY: all
+all: $(BIN)
+
+$(ELF): $(OBJS)
+	$(ARMCC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
+	$(ARMSIZE) -A $@
+
+$(BIN): $(ELF)
+	$(OBJCOPY) -O binary $< $@
+
+.PHONY: flash
+flash: $(BIN)
+	st-flash write $(BIN) $(STARTMEM)
+
+.PHONY: erase
+erase:
+	st-flash erase
+
+.PHONY: install
+install: erase flash
+
+.PHONY: clean
+clean:
+	rm -f *.o *.bin *.elf *.d *.map
+
diff --git a/blue-pill/blinky/blinky.c b/blue-pill/blinky/blinky.c
new file mode 100644
index 0000000..9f6dbc2
--- /dev/null
+++ b/blue-pill/blinky/blinky.c
@@ -0,0 +1,55 @@
+/* based on example from https://github.com/satoshinm/pill_blink */
+
+static inline void
+delay(unsigned long ms)
+{
+	for (unsigned long i = 0; i < ms; ++i) __asm__("nop");
+}
+
+static inline void
+led_off() {
+        (*(volatile unsigned int *)(0x40011010)) = (1 << 13);
+}
+
+static inline void
+led_on() {
+        (*(volatile unsigned int *)(0x40011014)) = (1 << 13);
+}
+
+void __attribute__ ((weak, naked)) reset_handler(void) {
+    (*(volatile unsigned int *)(0x40021018)) |= (1 << 4);
+
+    (*(volatile unsigned int *)(0x40011004)) |= (0x00 << (((13 - 8) * 4) + 2));
+    (*(volatile unsigned int *)(0x40011004)) |= (0x02 << ((13 - 8) * 4));
+
+    while(1) {
+	    led_off();
+	    delay(1000000);
+	    led_on();
+	    delay(100000);
+	    led_off();
+	    delay(100000);
+	    led_on();
+	    delay(100000);
+    }
+}
+
+__attribute__ ((section(".vectors")))
+struct {
+    unsigned int *initial_sp_value;
+    void (*reset)(void);
+    void (*nmi)(void);
+    void (*hard_fault)(void);
+    void (*memory_manage_fault)(void);
+    void (*bus_fault)(void);
+    void (*usage_fault)(void);
+    void (*reserved_x001c[4])(void);
+    void (*sv_call)(void);
+    void (*debug_monitor)(void);
+    void (*reserved_x0034)(void);
+    void (*pend_sv)(void);
+    void (*systick)(void);
+    void (*irq[68])(void);
+} vector_table = {
+    .reset = reset_handler,
+};
diff --git a/blue-pill/blinky/bluepill.ld b/blue-pill/blinky/bluepill.ld
new file mode 100644
index 0000000..bdbdac1
--- /dev/null
+++ b/blue-pill/blinky/bluepill.ld
@@ -0,0 +1,19 @@
+/* from https://github.com/satoshinm/pill_blink/ */
+
+MEMORY
+{
+    rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+    ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+EXTERN(vector_table);
+ENTRY(reset_handler);
+
+SECTIONS
+{
+    .text : {
+        *(.vectors)
+        *(.text*)
+        . = ALIGN(4);
+    } >rom
+}
diff --git a/blue-pill/pins.txt b/blue-pill/pins.txt
new file mode 100644
index 0000000..eff2b84
--- /dev/null
+++ b/blue-pill/pins.txt
@@ -0,0 +1,12 @@
+BOARD:
+
+	|         |
+	+-+-+-+-+-+
+          | | | |
+          4 3 2 1
+
+1: ground (black)
+2: SWCLK (white)
+3: SWDIO (grey)
+4: 3V3 (purple)
+
diff --git a/blue-pill/skeleton/Makefile b/blue-pill/skeleton/Makefile
new file mode 100644
index 0000000..7c868d0
--- /dev/null
+++ b/blue-pill/skeleton/Makefile
@@ -0,0 +1,52 @@
+# configurables
+OBJS :=		
+TARGET :=	
+
+# targets
+ELF :=		$(TARGET).elf
+BIN :=		$(TARGET).bin
+
+# toolchain setup
+ARMTC :=	arm-none-eabi
+ARMCC :=	$(ARMTC)-gcc
+CC :=		$(ARMCC)
+LD :=		$(ARMCC)
+ARMSIZE :=	$(ARMTC)-size
+OBJCOPY :=	$(ARMTC)-objcopy
+
+# compiler options
+CPUFLAGS :=	-mcpu=cortex-m3 -mthumb
+CFLAGS :=	-Wall -Wextra -Os -MD $(CPUFLAGS)
+LDFLAGS :=	$(CPUFLAGS) -nostartfiles -Wl,-T,bluepill.ld
+LDLIBS :=	-lc -lnosys
+
+# programmer options
+STARTMEM :=	0x8000000
+
+# targets
+
+.PHONY: all
+all: $(BIN)
+
+$(ELF): $(OBJS)
+	$(ARMCC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
+	$(ARMSIZE) -A $@
+
+$(BIN): $(ELF)
+	$(OBJCOPY) -O binary $< $@
+
+.PHONY: flash
+flash: $(BIN)
+	st-flash write $(BIN) $(STARTMEM)
+
+.PHONY: erase
+erase:
+	st-flash erase
+
+.PHONY: install
+install: erase flash
+
+.PHONY: clean
+clean:
+	rm -f *.o *.bin *.elf *.d *.map
+
diff --git a/blue-pill/skeleton/bluepill.ld b/blue-pill/skeleton/bluepill.ld
new file mode 100644
index 0000000..57b696a
--- /dev/null
+++ b/blue-pill/skeleton/bluepill.ld
@@ -0,0 +1,19 @@
+# from https://github.com/satoshinm/pill_blink/
+
+MEMORY
+{
+    rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+    ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+EXTERN(vector_table);
+ENTRY(reset_handler);
+
+SECTIONS
+{
+    .text : {
+        *(.vectors)
+        *(.text*)
+        . = ALIGN(4);
+    } >rom
+}