First commit

Makefile

@@ -0,0 +1,19 @@
+TARGET = main
+GCCFLAGS = -L../../libopencm3/libopencm3/include -DSTM32F1
+LIBS = ../../libopencm3/libopencm3/lib/libopencm3_stm32f1.a
+
+.DEFAULT: compile link
+
+.PHONY: compile flash all link
+
+all: compile link flash
+
+compile: $(TARGET).o
+
+%.o: %.c
+	arm-none-eabi-gcc -c $(GCCFLAGS) $*.c -o $*.o
+
+link: $(TARGET).bin
+
+%.bin: %.o $(LIBS)
+	arm-none-eabi-gcc $^ -o $*.bin

Makefile_analysis

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+BINARY=fancyblink
+LDSCRIPT=../stm32vl-discovery.ld
+?? LDSCRIPT=./lib-ex/ex/stm32/f1/stvldisco/stm32vl-discovery.ld
+LIBNAME= opencm3-stm32f1
+DEFS =  -DSTM32F1
+
+FP_FLAGS = -msoft-float
+ARCH_FLAGS = -mthumb -mcpu=cortex-m3 $(FP_FLAGS) -mfix-cortex-m3-ldrd
+=> ARCH_FLAGS = -mthumb -mcpu=cortex-m3 -msoft-float -mfix-cortex-m3-ldrd
+
+STLINK_PORT = 4242
+
+### Makefile.rules
+PREFIX = arm-none-eabi
+CC = $(PREFIX)-gcc
+=> CC = arm-none-eabi-gcc
+LD = $(PREFIX)-gcc
+=> LD = arm-none-eabi-gcc
+AS = $(PREFIX)-as
+=> AS = arm-none-eabi-as
+OBJCOPY = $(PREFIX)-objcopy
+=> OBJCOPY = arm-none-eabi-objcopy
+
+OBJS = $(BINARY).o
+=> OBJS = fancyblink.o
+
+LIBPATH = ./libopencm3		?? Prostě cesta k libopencm3
+OPENCM3_DIR = magic!!		?? složka, kde je libopencm3
+
+INCLUDE_DIR = $(OPENCM3_DIR)/include
+=> INCLUDE_DIR ??= ~/Dev/STM/libocm3/libocm3/include
+LIB_DIR = $(OPENCM3_DIR)/lib
+=> LIB_DIR ??= ~/Dev/STM/libocm3/libocm3/lib
+SCRIPT_DIR = $(OPENCM3_DIR)/scripts
+=> SCRIPT_DIR ??= ~/Dev/STM/libocm3/libocm3/scripts
+
+CFLAGS = -Os -g -Wextra -Wshadow -Wimplicit-function-declaration -Wredundant-decls -Wmissing-prototypes -fno-common -ffunction-sections -fdata-sections
+		?? Většina zbytečných (-W...)
+CPPFLAGS = -MD -Wall -Wundef -I$(INCLUDE_DIR) $(DEFS)
+=> CPPFLAGS = -MD -Wall -Wundef -I~/Dev/ST/locm3/locm3/include -DSTM32F1
+LDFLAGS = --static -nostartfiles -L$(LIB_DIR) -T$(LDSCRIPT) -Wl,-Map=$(*).map -Wl,--gc-sections
+		?? $(*).map prostě najít .map soubor
+=> LDFLAGS = --static -nostartfiles -L.../libocm3/lib -Tněkde/stm32vl-discovery.ld -Wl,-Map=$(*).map -Wl,--gc-sections
+
+LDLIBS = -l$(LIBNAME) -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
+=> LDLIBS = -lopencm3-stm32f1 -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
+
+>>> LET US COMPILE
+--------------------------------------------------
+
+To make the .o:
+===============
+$(CC) $(CFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) -o něco.o -c něco.c
+=> arm-none-eabi-gcc {Flagy na všechno} -c něco.c -o něco.o
+>>> Hotovo!!
+
+To make the elf:
+================
+$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJS) $(LDLIBS) -o něco.elf
+	-> vyžaduje $(OBJS), existenci $(LDSCRIPT) a $(LIB_DIR)/lib$(LIBNAME).a
+=> arm-none-eabi-gcc {hromada zbytečných LDFLAGS, ARCH_FLAGS} něco.o {LDLIBS} -o něco.elf
+	-> vyžaduje vytvoření něco.o (zbytek už je v libopencm3, SNAD)
+>>> Hotovo!!
+
+To make the bin:
+================
+$(OBJCOPY) -Obinary něco.elf něco.bin
+=> arm-none-eabi-objcopy -Obinary něco.elf něco.bin
+>>> Hotovo!!
+

Makefile_libopencm3-examples

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+include ../../libopencm3-examples/libopencm3-examples/examples/stm32/f1/stm32vl-discovery/fancyblink/Makefile

main.c

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+/*
+ * My first project
+ *
+ * It blinks LEDs like counting in binary, when the button is pressed, it reverses the order
+ *
+ * Build on top of libopenocm3, blackbox parts of code (setup()) copied from
+ * libopencm3-examples/examples/stm32/f1/stm32vl-discovery/button project
+ *
+ * Open source licence, let's say Artistic Licence, although it doesn't matter, as it is local only
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <stdbool.h>
+
+#define DELAY 8000000		// Should be a second, or maybe not (second iff 8MHz clk, 1/3second if 24MHz clk)
+#define STM32F1 1			// Needed for libopencm3
+
+void setup (void) {			// All the blackbox code
+	rcc_clock_setup_in_hse_8mhz_out_24mhz();
+	rcc_periph_clock_enable(RCC_GPIOC);
+	rcc_periph_clock_enable(RCC_GPIOA);
+	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO8 | GPIO9);
+	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO0);
+}
+
+void inline wait (int ticks) {	// This works in libopenocm3 examples
+	int i;
+	for (i=0;i<ticks;i++) __asm__("nop");
+	return;
+}
+
+int main (void) {
+	setup();
+
+	// Array of what leds should be on
+	uint16_t states[4] = {0, GPIO9, GPIO8, GPIO9 | GPIO8};
+	enum {FORWARD, BACKWARD} direction = FORWARD;
+	bool pressed = false;
+	char state;
+
+	while (true) {
+		if (/*Button pressed, but was not*/ gpio_get(GPIOA, GPIO0) && (pressed == false) ) {
+			pressed = true;
+			direction = (direction == FORWARD ? BACKWARD : FORWARD);	// Switch direction
+		} else /*Button not pressed, possibly released*/ {
+			pressed = false;
+		}
+		state = (direction == FORWARD ? (state + 1)%4 : (/*state+4-1*/ state+3)%4 );
+
+		gpio_set(GPIOC, states[state]);
+		wait(DELAY);
+	}
+	return 0;
+}