Debugging on the board-lighting method

1. makefile under Win
Makefile

Asmasm led. S-O led. O // compile the. S source file into the target file
Armlink-ro-base 0x0-entry 0x0 led. o-O led. axf // connector, parameter 1: Run. start address of the Text Segment, base address, parameter 2: The entry address for debugging; (optional )//. an elf file that can be debugged by the axf with debugging information.
Fromelf led. axf-bin-output led. Bin // remove the debugging information of. axf, generate a streaking bind file, and execute it on the board (exec can be used directly );

Ii. Lighting method (very hanging debuger) my frist Program
Step 3: 1. iopmod: Set the input and output directions of gpio, Io control set output (1)/input (0); 2, 3: iopdata: directly assign a value of 1 light to the LED pin, 0 off;
1. iopmod
First, set the input/output direction of gpio.
; The internal I/O port mode register iopmod (Address: 0x03ff5000) is implemented as follows:
LDR R1, = 0x0003ffff; set all 18 gpios 'ction ction to output
LDR r0, = 0x03ff5000
STR R1, [R0]

2. Then, set the relevant gpio output 1 to light up the connected led.
; This is achieved by setting the iopdata (Address: 0x03ff5008) of the internal IO port data register of initi4510b:
The implementation principle is also very simple. The LED light is connected to the IO provided by the. The specific connection method is as follows:
;
; Hardware connection
; Pio17 pio04 pio05 pio06 (gpio); query datasheet to find which one can make the corresponding
; The led below is on.
; D6 D7 D8 D9 (LED );
; So output value = 0x00020070 = (0b0000 0000 0000 0010 0000 0000 0111); check DS and assign 1 to the bit of the IO register, you can set the corresponding gpio to 1 or 0, and then control the led to be on or off.
;

; Light the LED, flashing
LDR R1, = 0x00020070; show led = 1111
Loop:
LDR r0, = 0x03ff5008
STR R1, [R0]
B Loop

3.
; Turn off the LED
LDR R1, = 0x00000000; show led = 0000
Loop:
LDR r0, = 0x03ff5008
STR R1, [R0]
B Loop

Use the analyticdb 1.2 compiler to compile, link, and obtain binary executable code:
 
Armasm led_1111.s-O led_1111.o
Armlink-ro-base 0x0-entry 0x0 led_1111.o-O led_1111.axf // file. axf
Fromelf led_1111.axf-bin-output led_1111.bin

A self-made, welded, and debugged board can first burn the lamp-on program and run it.
When flashing, it should at least indicate the connection between the CPU and flash, the welding is normal, and the crystal oscillator works normally. // Crystal oscillator ??
Before printf fails to output data, LED is always our most reliable debuger.