bluepill: start HAL, update skeleton.
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4be849722a
commit
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@ -16,7 +16,7 @@ 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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CPUFLAGS := -mcpu=cortex-m3 -mthumb -std=c99
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CFLAGS := -Wall -Wextra -Os -MD $(CPUFLAGS)
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LDFLAGS := $(CPUFLAGS) -nostartfiles -Wl,-T,bluepill.ld
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LDLIBS := -lc -lnosys
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@ -1,5 +1,8 @@
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/* based on example from https://github.com/satoshinm/pill_blink */
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#include "bluepill.h"
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#define LED_PIN 13
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static inline void
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delay(unsigned long ms)
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{
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@ -8,19 +11,17 @@ delay(unsigned long ms)
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static inline void
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led_off() {
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(*(volatile unsigned int *)(0x40011010)) = (1 << 13);
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clear_pin(GPIO_C, LED_PIN);
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}
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static inline void
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led_on() {
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(*(volatile unsigned int *)(0x40011014)) = (1 << 13);
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set_pin(GPIO_C, LED_PIN);
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}
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void __attribute__ ((weak, naked)) reset_handler(void) {
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(*(volatile unsigned int *)(0x40021018)) |= (1 << 4);
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(*(volatile unsigned int *)(0x40011004)) |= (0x00 << (((13 - 8) * 4) + 2));
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(*(volatile unsigned int *)(0x40011004)) |= (0x02 << ((13 - 8) * 4));
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*RCC |= (1 << 4); /* enable port C clock */
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output_mode(GPIO_C, LED_PIN, OUTPUT_GPP, OUTPUT_MAX_2MHZ);
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while(1) {
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led_off();
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@ -0,0 +1,56 @@
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# configurables
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OBJS :=
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TARGET := blink
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OBJS += $(TARGET).o
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# targets
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ELF := $(TARGET).elf
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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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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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LDFLAGS := $(CPUFLAGS) -nostartfiles -Wl,-T,stm32f103.ld
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LDLIBS := -lc -lnosys
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# programmer options
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STARTMEM := 0x8000000
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# targets
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.PHONY: all
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all: $(BIN)
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$(ELF): $(OBJS)
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$(ARMCC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
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$(ARMSIZE) -A $@
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$(BIN): $(ELF)
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$(OBJCOPY) -O binary $< $@
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.PHONY: flash
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flash: $(BIN)
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st-flash write $(BIN) $(STARTMEM)
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.PHONY: erase
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erase:
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st-flash erase
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.PHONY: install
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install: erase flash
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.PHONY: clean
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clean:
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rm -f *.o *.bin *.elf *.d *.map
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@ -0,0 +1,50 @@
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#include "bluepill.h"
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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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while(1) {
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GPIO_C->clear_pin(LED_PIN);
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delay(1000000);
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GPIO_C->set_pin(LED_PIN);
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delay(100000);
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GPIO_C->clear_pin(LED_PIN);
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delay(100000);
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GPIO_C->set_pin(LED_PIN);
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delay(100000);
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}
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}
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@ -0,0 +1,7 @@
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#ifndef __BLUEPILL_H__
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#define __BLUEPILL_H__
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#include "bluepill/gpio.h"
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#include "bluepill/rcc.h"
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#endif // __BLUEPILL_H__
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@ -0,0 +1,54 @@
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#ifndef __BLUEPILL_GPIO_H__
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#define __BLUEPILL_GPIO_H__
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#include <stdint.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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constexpr volatile unsigned int *PORTC = reinterpret_cast<volatile unsigned int *>(0x40011000);
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constexpr volatile unsigned int *PORTD = reinterpret_cast<volatile unsigned int *>(0x40011400);
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constexpr volatile unsigned int *PORTE = reinterpret_cast<volatile unsigned int *>(0x40011800);
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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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if (pin > 7) {
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pin = ((pin - 8) * 4);
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this->CRH |= (max << pin);
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this->CRH |= (mode << (pin + 2));
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}
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else {
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pin *= 4;
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this->CRL |= (max << pin);
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this->CRL |= (mode << (pin + 2));
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}
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}
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private:
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uint32_t CRL; /* configuration register low */
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uint32_t CRH; /* configuration register high */
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uint32_t IDR; /* input data register */
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uint32_t ODR; /* output data register */
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uint32_t BSRR; /* bit set / reset register */
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uint16_t BRR; /* reset register */
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uint32_t LCKR; /* locking register */
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};
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GPIO *GPIO_A = (GPIO *)PORTA;
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GPIO *GPIO_B = (GPIO *)PORTB;
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GPIO *GPIO_C = (GPIO *)PORTC;
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GPIO *GPIO_D = (GPIO *)PORTD;
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GPIO *GPIO_E = (GPIO *)PORTE;
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const uint32_t OUTPUT_MAX_2MHZ = 2;
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const uint32_t OUTPUT_MAX_10MHZ = 1;
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const uint32_t OUTPUT_MAX_50MHZ = 3;
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const uint32_t OUTPUT_GPP = 0;
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const uint32_t OUTPUT_GOD = 1;
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const uint32_t OUTPUT_APP = 2;
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const uint32_t OUTPUT_AOD = 3;
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#endif // __BLUEPILL_GPIO_H__
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@ -0,0 +1,6 @@
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#ifndef __BLUEPILL_RCC_H__
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#define __BLUEPILL_RCC_H__
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constexpr volatile unsigned int *RCC = reinterpret_cast<volatile unsigned int *>(0x40021000);
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#endif // __BLUEPILL_RCC_H__
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@ -0,0 +1,19 @@
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/* from https://github.com/satoshinm/pill_blink/ */
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MEMORY
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{
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rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
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ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
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}
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EXTERN(vector_table);
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ENTRY(reset_handler);
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SECTIONS
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{
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.text : {
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*(.vectors)
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*(.text*)
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. = ALIGN(4);
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} >rom
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}
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@ -1,4 +1,4 @@
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BOARD:
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BOARD (STM32F103C8T6):
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+-+-+-+-+-+
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