微處理器 - Bouffalo Lab BL808 (Sipeed M1s Dock) - Assembly - LED

參考資訊：
https://github.com/bouffalolab/bl808_linux
https://wiki.sipeed.com/hardware/en/maix/m1s/m1s_dock.html

LED是連接到IO8



每個GPIO都支援多種功能切換


gpio_cfg8


main.s

    .global _start

    .equiv gpio_cfg8, 0x200008e4
 
    .text
    .org 0x0000
_vector:
    j _start
 
    .org 0x0200
_start:
    fence
    fence.i
    icache.iall
    csrr a5, mhcr
    ori a5, a5, 1
    csrw mhcr, a5

    fence
    fence.i
    fence
    fence.i
    dcache.iall
    csrr a5, mhcr
    lui a4, 1
    addi a4, a4, 62
    or a5, a5, a4
    csrw mhcr, a5
    fence
    fence.i

    li t0, (1 << 6) | (11 << 8) | (1 << 24)
    li t1, (1 << 24)
0:
    xor t0, t0, t1
    li a0, gpio_cfg8
    sw t0, 0(a0)

    lui t2, 10000
1:
    nop
    addi t2, t2, -1
    bgtz t2, 1b
    j 0b
    .end

main.ld

MEMORY {
    FLASH : ORIGIN = 0x58000000, LENGTH = 32M
}

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

Makefile

all:
	riscv64-unknown-linux-gnu-gcc -o main.o main.s -nostdlib -march=rv32imafcpzpsfoperand_xtheade -mabi=ilp32f -mtune=e907
	riscv64-unknown-linux-gnu-ld -T main.ld -o main.elf main.o -b elf32-littleriscv
	riscv64-unknown-linux-gnu-objcopy -O binary main.elf main.bin

clean:
	rm -rf main.bin main.o main.elf

編譯

$ make
    riscv64-unknown-linux-gnu-gcc -o main.o main.s -nostdlib -march=rv32imafcpzpsfoperand_xtheade -mabi=ilp32f -mtune=e907
    riscv64-unknown-linux-gnu-ld -T main.ld -o main.elf main.o -b elf32-littleriscv
    riscv64-unknown-linux-gnu-ld: Using an executable file (main.o) as input to a link is deprecated - support is likely to be removed in the future
    riscv64-unknown-linux-gnu-objcopy -O binary main.elf main.bin

連接UART到PC


執行BLDevCube-ubuntu


因為目前只需要使用M0，因此，切換到MCU頁面，將M0 Group設定成group0，Image Addr設定成Flash起始位址0x58000000，然後選擇main.bin，Port/SN會根據個人的電腦而不一樣，司徒的是/dev/ttyACM1，Uart Rate設定成2000000


因為Sipeed M1s Dock有連接PU_CHIP(RST)到BL702，因此，按下Create & Download就可以燒錄完成

假如遇到無法燒錄的狀況時，可以使用如下方式進入燒錄模式：
1. 按下BOOT按鍵
2. 按下RST按鍵
3. 放開RST按鍵
4. 放開BOOT按鍵
然後再次按下Create & Download就可以燒錄完成

接著，按下RST按鍵或者按下BLDevCube-ubuntu的Open Uart按鈕