STM32F103 >> Assembly

LED

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參考資料：
1. pdf

RCC_APB2ENR暫存器，需要開啟GPIO-C的Clock


LED位置是PC13，設定成Output 50MHz


輸出資料


main.s

  .thumb
  .cpu cortex-m3
  .syntax unified
  
  .equ GPIOC_CRL,   0x40011000
  .equ GPIOC_CRH,   0x40011004
  .equ GPIOC_IDR,   0x40011008
  .equ GPIOC_ODR,   0x4001100c
  .equ GPIOC_BSRR,  0x40011010
  .equ GPIOC_BRR,   0x40011014
  .equ GPIOC_LCKR,  0x40011018
  .equ RCC_APB2ENR, 0x40021018
 
  .equ STACKINIT,   0x20005000
   
  .global _start
  .section .text
  .org 0x0
  .word STACKINIT
  .word _start
 
  .org 0x100
  .align 2
  .thumb_func
_start:
  ldr r0, =0x00000010
  ldr r1, =RCC_APB2ENR
  str r0, [r1]

  ldr r0, =GPIOC_CRH
  ldr r1, =(3 << 20)
  str r1, [r0]

  ldr r2, =GPIOC_ODR
  ldr r3, =(1 << 13)
loop:
  str r3, [r2]
  eor r3, (1 << 13)
  ldr r0, =50
  bl delay
  b loop
 
  .align 2
  .thumb_func
delay:
  push {lr}
0:
  ldr r1, =8000
1:
  sub r1, #1
  cmp r1, #0
  bne 1b
  sub r0, #1
  cmp r0, #0
  bne 0b
  pop {pc} 
  .end

main.ld

MEMORY {
  RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 20K
  FLASH (rx) : ORIGIN = 0x8000000, LENGTH = 128K
}
 
SECTIONS {
  .text : { 
    *(.text)
  } >FLASH
   
  .bss : { 
    *(.bss)
  } >RAM
 
  .data : { 
    *(.data)
  } >RAM
}

Makefile

all:
	arm-none-eabi-as -ggdb -mcpu=cortex-m3 -mthumb -mthumb-interwork -o main.o main.s
	arm-none-eabi-ld -T main.ld -o main.elf main.o
	arm-none-eabi-objcopy -O binary main.elf main.bin
 
flash:
	sudo openocd -f /usr/local/share/openocd/scripts/interface/stlink.cfg -f /usr/local/share/openocd/scripts/target/stm32f1x.cfg -c "program main.bin reset exit 0x8000000"
 
debug:
	sudo openocd -f /usr/local/share/openocd/scripts/interface/stlink-v2.cfg -f /usr/local/share/openocd/scripts/target/stm32f1x.cfg -c "program main.bin halt 0x8000000"
 
clean:
	rm -rf main.o main.elf main.bin

編譯

$ make
  arm-none-eabi-as -ggdb -mcpu=cortex-m3 -mthumb -mthumb-interwork -o main.o main.s
  arm-none-eabi-ld -T main.ld -o main.elf main.o
  arm-none-eabi-objcopy -O binary main.elf main.bin

燒錄

$ make flash
  sudo openocd -f /usr/local/share/openocd/scripts/interface/stlink.cfg -f /usr/local/share/openocd/scripts/target/stm32f1x.cfg -c "program main.bin reset exit 0x8000000"
  Open On-Chip Debugger 0.11.0-rc1+dev-00010-gc69b4deae-dirty (2020-12-27-01:20)
  Licensed under GNU GPL v2
  For bug reports, read
    http://openocd.org/doc/doxygen/bugs.html
  Info : auto-selecting first available session transport "hla_swd". To override use 'transport select '.
  Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
  Info : clock speed 1000 kHz
  Info : STLINK V2J17S4 (API v2) VID:PID 0483:3748
  Info : Target voltage: 3.195294
  Info : stm32f1x.cpu: hardware has 6 breakpoints, 4 watchpoints
  Info : starting gdb server for stm32f1x.cpu on 3333
  Info : Listening on port 3333 for gdb connections
  target halted due to debug-request, current mode: Thread
  xPSR: 0x01000000 pc: 0x08000100 msp: 0x20005000
  ** Programming Started **
  Info : device id = 0x20036410
  Info : flash size = 128kbytes
  ** Programming Finished **
  ** Resetting Target **
  shutdown command invoked

完成

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