Ïðèâåò, íàðîä. Äàâàéòå ñ âîïðîñàìè ïðîãðàììèðîâàíèÿ stm32 çäåñü ðàñïîëîæèìñÿ.
À òî ïðî êîíñòðóêöèè íà stm32 òåìû èìåþòñÿ, à ïðî ïðîãðàììèðîâàíèå - íåò. Îäíè è òå æå âîïðîñû ïîäíèìàþòñÿ â ðàçíûõ òåìàõ.
Äëÿ çàòðàâêè. (-:
 ïîñëåäíåå âðåìÿ øòóäèðîâàë stm32. Íàðàáîòàííûå ñ avr ìåòîäèêè ïðèãîäèëèñü äàæå áîëüøå, ÷åì îæèäàë. Ñ àññåìáëåðîì ðàçíèöû îñîáîé íåò. Èíñòðóêöèè, íó äà, îòëè÷àþòñÿ, íå êàðäèíàëüíî. Êàê avr ïðîãðàììèðîâàë ïîä gas (gnu assembly), òàê è stm32 ïðîäîëæèë.
Ïðåäñòàâëÿþ ïðîñòóþ ëàáó - "ÁàðýìÅòàë áëèíüê".
Êòî íå çíàåò - "baremetal", ýòî çíà÷èò "÷èñòî æåëåçÿ÷íûé". Ïîäõîä ê çàäà÷å áåç èçëèøåñòâ. Äàæå áåç îñîáîãî ìíåíèÿ íà ÷¸ì ïðàâèëüíî ïðîãðàììèðîâàòü âìåñòî àññåìáëåðà.
Voila! Ïîåõàëè!
Êîä:oleg@tower ~/ $ tree . ├── Makefile ├── linker.ld └── main.S 0 directories, 3 filesÊîä:oleg@tower ~/ $ cat Makefile TARGET = main LD_SCRIPT = linker.ld TOOLCHAIN = /usr CC = $(TOOLCHAIN)/bin/arm-none-eabi-gcc AS = $(TOOLCHAIN)/bin/arm-none-eabi-as LD = $(TOOLCHAIN)/bin/arm-none-eabi-ld OC = $(TOOLCHAIN)/bin/arm-none-eabi-objcopy OD = $(TOOLCHAIN)/bin/arm-none-eabi-objdump OS = $(TOOLCHAIN)/bin/arm-none-eabi-size ASFLAGS += -c ASFLAGS += -specs=nosys.specs ASFLAGS += -g ASFLAGS += -O0 ASFLAGS += -mcpu=cortex-m3 ASFLAGS += -mthumb ASFLAGS += -Wall ASFLAGS += -Wextra ASFLAGS += -fmessage-length=0 ASFLAGS += -no-pie ASFLAGS += -march=armv7-m ASFLAGS += -masm-syntax-unified ASFLAGS += -fno-exceptions ASFLAGS += -fno-unwind-tables ASFLAGS += -mlittle-endian ASFLAGS += -fno-rtti LFLAGS += -mcpu=cortex-m3 LFLAGS += -march=armv7-m LFLAGS += -mlittle-endian LFLAGS += -masm-syntax-unified LFLAGS += -fno-rtti LFLAGS += -fno-exceptions LFLAGS += -fno-unwind-tables LFLAGS += -mthumb LFLAGS += -Wall LFLAGS += -specs=nosys.specs LFLAGS += -nostdlib LFLAGS += -nostartfiles LFLAGS += -lgcc LFLAGS += -T$(LD_SCRIPT) LFLAGS += -no-pie AS_SRC = main.S INCLUDE = -I./ OBJS = $(AS_SRC:.S=.o) .PHONY: all all: $(TARGET).bin %.o: %.S $(CC) -x assembler-with-cpp $(ASFLAGS) $< -o $@ $(TARGET).elf: $(OBJS) $(CC) $^ $(LFLAGS) -o $@ $(TARGET).bin: $(TARGET).elf $(OC) -S -O binary $< $@ $(OS) $< .PHONY: clean clean: rm -f $(OBJS) rm -f $(TARGET).elf rm -f $(TARGET).bin flash: all st-flash --reset write $(TARGET).bin 0x8000000Êîä:oleg@tower ~/ $ cat linker.ld ENTRY(main) _estack = 0x20005000; MEMORY { FLASH ( rx ) : ORIGIN = 0x08000000, LENGTH = 64K RAM ( rxw ) : ORIGIN = 0x20000000, LENGTH = 20K } SECTIONS { .text : { . = ALIGN(4); *(.text) *(.text*) . = ALIGN(4); } >FLASH }Êîä:oleg@tower ~/ $ cat main.S .syntax unified .cpu cortex-m3 @ stm32f103c6t6 .global main @ .section .text @ only section boot: @ word .word _estack @ see linker script .word main @ reset address .thumb_func @ aka +1 offset to reset main: @ thumb code ldr r0, =(1<<4) @ mask GPIOC clock enable ldr r2, =0x40021000 @ bus clock reg ldr r1, =0x18 @ gpioc clock reg offset ldr r3, [r2, r1] @ read clock reg orr r0, r0, r3 @ set clock enable str r0, [r2, r1] @ update clock reg ldr r0, [r2, r1] @ just delay a bit ldr r0, [r2, r1] @ just delay a bit ldr r0, =(1<<21) @ mask C13 output push-pull at 2MHz ldr r2, =0x40011000 @ (GPIO offset) ldr r1, =0x04 @ (GPIOC_CRH offset) ldr r3, [r2, r1] @ read orr r0, r0, r3 @ modify str r0, [r2, r1] @ write loop: ldr r0, =(1<<13) @ mask C13 high ldr r2, =0x40011000 @ (GPIO offset) ldr r1, =0x10 @ (GPIOC_BSRR offset) str r0, [r2, r1] @ write bl delay ldr r0, =(1<<29) @ mask C13 low ldr r2, =0x40011000 @ (GPIO offset) ldr r1, =0x10 @ (GPIOC_BSRR offset) str r0, [r2, r1] @ write bl delay b loop @ infinite loop delay: ldr r4, =0x100000 again: subs r4, r4, 1 bne again bx lr .endÊîä:oleg@tower ~/ $ make clean all rm -f main.o rm -f main.elf rm -f main.bin /usr/bin/arm-none-eabi-gcc -x assembler-with-cpp -c -specs=nosys.specs -g -O0 -mcpu=cortex-m3 -mthumb -Wall -Wextra -fmessage-length=0 -no-pie -march=armv7-m -masm-syntax-unified -fno-exceptions -fno-unwind-tables -mlittle-endian -fno-rtti main.S -o main.o /usr/bin/arm-none-eabi-gcc main.o -mcpu=cortex-m3 -march=armv7-m -mlittle-endian -masm-syntax-unified -fno-rtti -fno-exceptions -fno-unwind-tables -mthumb -Wall -specs=nosys.specs -nostdlib -nostartfiles -lgcc -Tlinker.ld -no-pie -o main.elf /usr/bin/arm-none-eabi-objcopy -S -O binary main.elf main.bin /usr/bin/arm-none-eabi-size main.elf text data bss dec hex filename 100 0 0 100 64 main.elfÌèãàåò.Êîä:oleg@tower ~/ $ make flash st-flash --reset write main.bin 0x8000000 st-flash 1.7.0 2023-04-14T20:38:44 INFO common.c: F1xx High-density: 64 KiB SRAM, 256 KiB flash in at least 2 KiB pages. file main.bin md5 checksum: 78946d427b4d276feeea02bb3ff59e0, stlink checksum: 0x00001f46 2023-04-14T20:38:44 INFO common.c: Attempting to write 100 (0x64) bytes to stm32 address: 134217728 (0x8000000) 2023-04-14T20:38:44 INFO common.c: Flash page at addr: 0x08000000 erased 2023-04-14T20:38:44 INFO common.c: Finished erasing 1 pages of 2048 (0x800) bytes 2023-04-14T20:38:44 INFO common.c: Starting Flash write for VL/F0/F3/F1_XL 2023-04-14T20:38:44 INFO flash_loader.c: Successfully loaded flash loader in sram 2023-04-14T20:38:44 INFO flash_loader.c: Clear DFSR 1/ 1 pages written 2023-04-14T20:38:44 INFO common.c: Starting verification of write complete 2023-04-14T20:38:44 INFO common.c: Flash written and verified! jolly good! 2023-04-14T20:38:44 WARN common.c: NRST is not connected
Ðåçþìå òî æå, ÷òî è äëÿ ìèêðî÷èïîâ:
Êòî ñ÷èòàåò, ÷òî cortex-m ýòî âûíîñ ìîçãà, à äëÿ "âõîæäåíèÿ" íóæíî ÷òî-òî áîëüøåå, ÷åì ñòàðûé ëèíóêñîâûé íîóò èëè ðàñïáåðè, ñòîðóáëåâûé ïðîãðàììàòîð è áëþ-ïèë ñ êèòàéñêèì êëîíîì, òîãî âûíóæäåí ðàçî÷àðîâàòü. Áûëî áû æåëàíèå. Èç äîêóìåíòàöèè - äàòàøèò íà ìê, ðåôåðåíñ íà ìê, ðóêîâîäñòâî ïî ïðîãðàììèðîâàíèþ íà ìê. Âñå îò ðàçðàáîò÷èêà. Èç ñîôòà, êàê îáû÷íî - make, gcc, gdb, stlink, vim.
P.S. ×óòü íå çàáûë. Îáÿçàòåëüíî íóæåí êóñî÷åê ñèíåé èçîëåíòû. Àêêóðàò ìåæäó áëþ-ïèëîì è ïðîãðàììàòîðîì. Ó ïðîãðàììàòîðà àëþìèíèåâûé êîðïóñ. Êðàñêà ïîñòåïåííî ïðîøêðÿáàåòñÿ è ìîæåò êîðîòíóòü. Óäà÷è.
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