微處理器 - STMicroelectronics STM32F429 (STM32F429I-DISC1) - Assembly - LED

參考資訊：
https://www.st.com/resource/en/datasheet/dm00071990.pdf
https://www.st.com/resource/en/user_manual/dm00093903-discovery-kit-with-stm32f429zi-mcu-stmicroelectronics.pdf
https://www.st.com/resource/en/reference_manual/dm00031020-stm32f405-415-stm32f407-417-stm32f427-437-and-stm32f429-439-advanced-arm-based-32-bit-mcus-stmicroelectronics.pdf

LED測試使用PG-13


GPIO-G Clock


Mode


Output


main.s

    .equiv PORTG_BASE,  0x40021800
    .equiv GPIO_MODER,  0x0000
    .equiv GPIO_ODR,    0x0014

    .equiv RCC_BASE,    0x40023800 
    .equiv RCC_AHB1ENR, 0x0030

    .thumb
    .cpu cortex-m4
    .syntax unified

    .global _start

    .text
    .org 0x0000
_start:
    .word 0x20008000
    .word reset
 
    .org 0x0100
    .thumb_func
reset:
    ldr r0, =RCC_BASE
    ldr r1, [r0, #RCC_AHB1ENR]
    orr r1, #(1 << 6)
    str r1, [r0, #RCC_AHB1ENR]
 
    ldr r0, =PORTG_BASE
    ldr r1, =(1 << 26)
    str r1, [r0, #GPIO_MODER]
 
0:
    eor r1, #(1 << 13)
    str r1, [r0, #GPIO_ODR]
    ldr r2, =0x200000
1:
    subs r2, #1
    bne 1b
    b 0b
    .end

main.ld

MEMORY {
    RAM(xrw)   : ORIGIN = 0x20000000, LENGTH = 128K
    FLASH(xr ) : ORIGIN = 0x08000000, LENGTH = 128K
}

SECTIONS {
    .text   : { *(.text*) } > FLASH
    .rodata : { *(.rodata*) } > FLASH
    .bss    : { *(.bss*) } > FLASH
}

Makefile

all:
	arm-none-eabi-as -mcpu=cortex-m4 main.s -o main.o
	arm-none-eabi-ld -T main.ld -o main.elf main.o

flash:
	openocd -f /usr/local/share/openocd/scripts/interface/stlink.cfg -f /usr/local/share/openocd/scripts/target/stm32f4x.cfg -c "init; program main.elf; reset; exit;"

clean:
	rm -rf main.o main.elf

編譯、燒錄
1. 短路JP3
2. 短路CN4
3. 連接MiniUSB至PC
4. 執行如下命令

$ make
    arm-none-eabi-as -mcpu=cortex-m4 main.s -o main.o
    arm-none-eabi-ld -T main.ld -o main.elf main.o

$ make flash
    openocd -f /usr/local/share/openocd/scripts/interface/stlink.cfg -f /usr/local/share/openocd/scripts/target/stm32f4x.cfg -c "init; program main.elf; reset; exit;"
    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 2000 kHz
    Info : STLINK V2J25M14 (API v2) VID:PID 0483:374B
    Info : Target voltage: 2.885361
    Info : stm32f4x.cpu: hardware has 6 breakpoints, 4 watchpoints
    Info : starting gdb server for stm32f4x.cpu on 3333
    Info : Listening on port 3333 for gdb connections
    Info : Unable to match requested speed 2000 kHz, using 1800 kHz
    Info : Unable to match requested speed 2000 kHz, using 1800 kHz
    target halted due to debug-request, current mode: Thread
    xPSR: 0x01000000 pc: 0x08000100 msp: 0x20008000
    Info : Unable to match requested speed 8000 kHz, using 4000 kHz
    Info : Unable to match requested speed 8000 kHz, using 4000 kHz
    ** Programming Started **
    Info : device id = 0x20016419
    Info : flash size = 2048 kbytes
    Info : Dual Bank 2048 kiB STM32F42x/43x/469/479 found
    ** Programming Finished **
    Info : Unable to match requested speed 2000 kHz, using 1800 kHz
    Info : Unable to match requested speed 2000 kHz, using 1800 kHz

完成