blue-pill: start the startup code
no idea if this works yet
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899a1813d1
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@ -41,3 +41,7 @@ ods/src/ch??ex??
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*.la
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*_bench
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misc/kf/kf
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*.elf
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*.bin
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blue-pill/*/*.d
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core
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@ -1,5 +1,5 @@
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# configurables
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OBJS :=
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OBJS := startup.o
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TARGET := blink
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OBJS += $(TARGET).o
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@ -9,18 +9,17 @@ BIN := $(TARGET).bin
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# toolchain setup
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ARMTC := arm-none-eabi
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ARMCC := $(ARMTC)-gcc
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ARMCXX := $(ARMTC)-g++
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CC := $(ARMCC)
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CXX := $(ARMCXX)
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LD := $(ARMCXX)
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AS := $(ARMTC)-as
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CC := $(ARMTC)-gcc
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CXX := $(ARMTC)-g++
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LD := $(ARMTC)-ld
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ARMSIZE := $(ARMTC)-size
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OBJCOPY := $(ARMTC)-objcopy
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# compiler options
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CPUFLAGS := -mcpu=cortex-m3 -mthumb
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CFLAGS := -Wall -Wextra -Os -MD $(CPUFLAGS)
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CXXFLAGS := -Wall -Wextra -Os -MD $(CPUFLAGS) -std=c++14
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CXXFLAGS := $(CFLAGS) -std=c++14 -fno-rtti -fno-exceptions -ffunction-sections -fdata-sections -fno-builtin
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LDFLAGS := $(CPUFLAGS) -nostartfiles -Wl,-T,stm32f103.ld
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LDLIBS := -lc -lnosys
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@ -33,7 +32,7 @@ STARTMEM := 0x8000000
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all: $(BIN)
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$(ELF): $(OBJS)
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$(ARMCC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
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$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
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$(ARMSIZE) -A $@
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$(BIN): $(ELF)
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@ -2,48 +2,20 @@
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#define LED_PIN 13
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void reset_handler(void);
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__attribute__ ((section(".vectors")))
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struct {
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unsigned int *initial_sp_value;
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void (*reset)(void);
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void (*nmi)(void);
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void (*hard_fault)(void);
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void (*memory_manage_fault)(void);
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void (*bus_fault)(void);
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void (*usage_fault)(void);
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void (*reserved_x001c[4])(void);
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void (*sv_call)(void);
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void (*debug_monitor)(void);
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void (*reserved_x0034)(void);
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void (*pend_sv)(void);
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void (*systick)(void);
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void (*irq[68])(void);
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} vector_table = {
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initial_sp_value : (unsigned int *)0x100,
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reset : reset_handler,
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};
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static inline void
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delay(unsigned long ms)
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{
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for (unsigned long i = 0; i < ms; ++i) __asm__("nop");
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}
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// void __attribute__ ((weak, naked)) reset_handler(void) {
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void reset_handler() {
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*RCC |= (1 << 4); /* enable port C clock */
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GPIO_C->output_mode(LED_PIN, OUTPUT_GPP, OUTPUT_MAX_2MHZ);
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int
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main() {
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GPIO_C->enable_clock();
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GPIO_C->pin_mode(LED_PIN, true, OUTPUT_GPP, OUTPUT_MAX_2MHZ);
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while(1) {
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GPIO_C->clear_pin(LED_PIN);
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GPIO_C->pin_clear(LED_PIN);
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delay(1000000);
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GPIO_C->set_pin(LED_PIN);
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GPIO_C->pin_set(LED_PIN);
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delay(100000);
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GPIO_C->clear_pin(LED_PIN);
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GPIO_C->pin_clear(LED_PIN);
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delay(100000);
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GPIO_C->set_pin(LED_PIN);
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GPIO_C->pin_set(LED_PIN);
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delay(100000);
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}
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}
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@ -4,4 +4,10 @@
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#include "bluepill/gpio.h"
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#include "bluepill/rcc.h"
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static inline void
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delay(unsigned long ms)
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{
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for (unsigned long i = 0; i < ms; ++i) __asm__("nop");
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}
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#endif // __BLUEPILL_H__
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@ -2,6 +2,7 @@
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#define __BLUEPILL_GPIO_H__
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#include <stdint.h>
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#include "rcc.h"
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constexpr volatile unsigned int *PORTA = reinterpret_cast<volatile unsigned int *>(0x40010800);
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constexpr volatile unsigned int *PORTB = reinterpret_cast<volatile unsigned int *>(0x40010c00);
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@ -11,9 +12,10 @@ constexpr volatile unsigned int *PORTE = reinterpret_cast<volatile unsigned int
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class GPIO {
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public:
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void set_pin(uint32_t pin) { this->BSRR |= ((1 << pin) << 16); }
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void clear_pin(uint32_t pin) { this->BSRR |= (1 << pin); }
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void output_mode(uint32_t pin, uint32_t mode, uint32_t max) {
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void pin_set(uint32_t pin) { this->BSRR |= ((1 << pin) << 16); }
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void pin_clear(uint32_t pin) { this->BSRR |= (1 << pin); }
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void pin_mode(uint32_t pin, bool output, uint32_t mode, uint32_t max) {
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if (output) {
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if (pin > 7) {
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pin = ((pin - 8) * 4);
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this->CRH |= (max << pin);
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@ -25,6 +27,17 @@ public:
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this->CRL |= (mode << (pin + 2));
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}
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}
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}
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uint32_t port_index(void) {
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/* Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn. */
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return (((unsigned int)this) - ((unsigned int)PORTA)) >> 10;
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}
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void enable_clock(void) {
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*RCC |= (1 << (this->port_index() + 2));
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}
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private:
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uint32_t CRL; /* configuration register low */
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@ -0,0 +1,27 @@
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/*
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* Startup code for the STM32F103-based blue pill board.
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*
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* TODO: revisit stack pointer
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* TODO: is the IRQv buffer actually needed right now?
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*/
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.globl vectors
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.align 2
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.long 0x100 /* best guess at stack pointer */
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.long reset_handler /* reset handler */
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.long 0 /* NMI handler */
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.long 0 /* hard_fault_handler */
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.long 0 /* memory management handler */
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.long 0 /* bus fault handler */
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.long 0 /* usage fault handler */
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.skip 0x20 /* reserved */
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.long 0 /* svcall handler */
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.long 0 /* debug handler */
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.skip 4 /* reserved */
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.long 0 /* pendsv handler */
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.long 0 /* systick handler */
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.skip 0x110 /* remaining / IRQ vectors */
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.globl reset_handler
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reset_handler:
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bl main
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