F1C100S >> Assembly
LED
參考資料:
1. pdf
2. lichee
3. mangopi_r
4. allwinner
電路圖
暫存器
配置功能
輸出控制
main.s
.global _start .equ GPIO_BASE, 0x01c20800 .equ PE_CFG0, (GPIO_BASE + (4 * 0x24) + 0x00) .equ PE_DATA, (GPIO_BASE + (4 * 0x24) + 0x10) .arm .text _start: .long 0xea000016 .byte 'e', 'G', 'O', 'N', '.', 'B', 'T', '0' .long 0, __spl_size .byte 'S', 'P', 'L', 2 .long 0, 0 .long 0, 0, 0, 0, 0, 0, 0, 0 .long 0, 0, 0, 0, 0, 0, 0, 0 _vector: b reset b . b . b . b . b . b . b . reset: ldr r0, =PE_CFG0 ldr r1, =0x00010000 str r1, [r0] ldr r0, =PE_DATA 0: ldr r1, =0x10 str r1, [r0] ldr r2, =50000 1: subs r2, #1 bne 1b ldr r1, =0x00 str r1, [r0] ldr r2, =50000 2: subs r2, #1 bne 2b b 0b .end
main.ld
OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm") OUTPUT_ARCH(arm) ENTRY(_start) MEMORY { ram : ORIGIN = 0x00000000, LENGTH = 32M } SECTIONS { .text : { PROVIDE(__spl_start = .); *(.text*) PROVIDE(__spl_end = .); *(.init.text) *(.exit.text) *(.glue*) *(.note.gnu.build-id) } > ram PROVIDE(__spl_size = __spl_end - __spl_start); .rodata ALIGN(8) : { PROVIDE(__rodata_start = .); *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) PROVIDE(__rodata_end = .); } > ram .data ALIGN(8) : { PROVIDE(__data_start = .); *(.data*) . = ALIGN(8); PROVIDE(__data_end = .); PROVIDE(__image_end = .); } > ram .bss ALIGN(8) (NOLOAD) : { PROVIDE(__bss_start = .); *(.bss*) *(.sbss*) *(COMMON) . = ALIGN(8); PROVIDE(__bss_end = .); } > ram .stab 0 : { *(.stab) } .stabstr 0 : { *(.stabstr) } .stab.excl 0 : { *(.stab.excl) } .stab.exclstr 0 : { *(.stab.exclstr) } .stab.index 0 : { *(.stab.index) } .stab.indexstr 0 : { *(.stab.indexstr) } .comment 0 : { *(.comment) } .debug_abbrev 0 : { *(.debug_abbrev) } .debug_info 0 : { *(.debug_info) } .debug_line 0 : { *(.debug_line) } .debug_pubnames 0 : { *(.debug_pubnames) } .debug_aranges 0 : { *(.debug_aranges) } }
Makefile
all: arm-none-eabi-as -mcpu=arm9 -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 gcc mksunxi.c -o mksunxi ./mksunxi main.bin flash: sunxi-fel -p spiflash-write 0 main.bin clean: rm -rf main.bin main.o main.elf
接著按住START按鍵,然後插入USB至電腦,可以找到如下裝置
$ lsusb Bus 002 Device 081: ID 1f3a:efe8 Onda (unverified) V972 tablet in flashing mode
編譯、燒錄
$ make arm-none-eabi-as -mcpu=arm9 -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 gcc mksunxi.c -o mksunxi ./mksunxi main.bin The bootloader head has been fixed, spl size is 512 bytes. $ make flash sunxi-fel -p spiflash-write 0 main.bin 100% [================================================] 1 kB, 55.9 kB/s
重新上電後,即可執行SPI Flash裡面的程式