blue-pill: convert blinky to startup.s boot.

This commit is contained in:
Kyle Isom 2018-03-07 16:58:06 -08:00
parent 244153679d
commit 524f860331
3 changed files with 36 additions and 25 deletions

View File

@ -1,5 +1,5 @@
# configurables
OBJS :=
OBJS := startup.o
TARGET := blinky
OBJS += $(TARGET).o
@ -9,9 +9,9 @@ BIN := $(TARGET).bin
# toolchain setup
ARMTC := arm-none-eabi
ARMCC := $(ARMTC)-gcc
CC := $(ARMCC)
LD := $(ARMCC)
CC := $(ARMTC)-gcc
LD := $(ARMTC)-gcc
AS := $(ARMTC)-as
ARMSIZE := $(ARMTC)-size
OBJCOPY := $(ARMTC)-objcopy
@ -30,7 +30,7 @@ STARTMEM := 0x8000000
all: $(BIN)
$(ELF): $(OBJS)
$(ARMCC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
$(ARMSIZE) $@
.PHONY: strip

View File

@ -19,7 +19,9 @@ led_on() {
set_pin(GPIO_C, LED_PIN);
}
void __attribute__ ((weak, naked)) reset_handler(void) {
int
main(void)
{
*RCC |= (1 << 4); /* enable port C clock */
output_mode(GPIO_C, LED_PIN, OUTPUT_GPP, OUTPUT_MAX_2MHZ);
@ -35,22 +37,3 @@ void __attribute__ ((weak, naked)) reset_handler(void) {
}
}
__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,
};

View File

@ -0,0 +1,28 @@
/*
* Startup code for the STM32F103-based blue pill board.
*
* TODO: revisit stack pointer
* TODO: is the IRQv buffer actually needed right now?
*/
.globl vectors
vectors:
.align 2
.long 0x100 /* best guess at stack pointer */
.long reset_handler /* reset handler */
.long 0 /* NMI handler */
.long 0 /* hard_fault_handler */
.long 0 /* memory management handler */
.long 0 /* bus fault handler */
.long 0 /* usage fault handler */
.skip 0x20 /* reserved */
.long 0 /* svcall handler */
.long 0 /* debug handler */
.skip 4 /* reserved */
.long 0 /* pendsv handler */
.long 0 /* systick handler */
.skip 0xf4 /* remaining / IRQ vectors */
.globl reset_handler
reset_handler:
bl main