Notes for writing arm Assembler

09:54:32

Just now, I added an assembly macro to nboot, resulting in a large area of error. As follows:

; Turn on all LEDs.
Macro
Pled_on $ data

LDR r0, = gpfcon
LDR R1, = 0x55aa
STR R1, [R0]
LDR r0, = gpfup
LDR R1, = 0xff
STR R1, [R0]
LDR r0, = gpfdat
LDR R1, = $ data
STR R1, [R0]
B.; programme is dead here

Mend

 

Build: [01: 0000000025: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (75): Error a0051: Unknown opcode: pled_on
Build: [01: 0000000027: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (77): Error a0064: code inside Data Section
Build: [01: 0000000029: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (78): Error a0064: code inside Data Section
Build: [01: 0000000031: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (79): Error a0064: code inside Data Section
Build: [01: 0000000033: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (80): Error a0064: code inside Data Section
Build: [01: 0000000035: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (81): Error a0064: code inside Data Section
Build: [01: 0000000037: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (82): Error a0064: code inside Data Section
Build: [01: 0000000039: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (83): Error a0064: code inside Data Section
Build: [01: 0000000041: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (84): Error a0064: code inside Data Section
Build: [01: 0000000043: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (84): Error a0017: Illegal $ substitution, non assembler variable
Build: [01: 0000000045: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (84): Error a0227: syntax error in Expression
Build: [01: 0000000047: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (85): Error a0064: code inside Data Section
Build: [01: 0000000049: errore] C:/wince500/platform/smdk2440a/src/bootloader/stepldr/startup. S (86): Error a0064: code inside Data Section

 

Later I found that it was a problem caused by macro freezing. Just indent it.

; Turn on all LEDs.
Macro
Pled_on $ data

LDR r0, = gpfcon
LDR R1, = 0x55aa
STR R1, [R0]
LDR r0, = gpfup
LDR R1, = 0xff
STR R1, [R0]
LDR r0, = gpfdat
LDR R1, = $ data
STR R1, [R0]
B.; programme is dead here

Mend