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[/] [light52/] [trunk/] [test/] [hello_asm/] [src/] [hello.a51] - Blame information for rev 3

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; hello.a51 -- 'Hello World' on serial console.
;
; This small program is meant to be run on a light52 MCU on actual hardware,
; as a first sanity check.
;
; This version of the program does not use interrupts.
;
; If this program runs and displays its message on a terminal, you may then be
; sure that your development environment is working.
 
 
        ; Include the definitions for the light52 derivative
        $nomod51
        $include (light52.mcu)
 
        ;-- Data variable definitions ------------------------------------------
 
        ; These are general purpose variables for use in subroutines.
        ; They must be saved and restored before use.
        var0    data    030h
 
        ; We'll place the stack above the reg banks and bit addressable area,
        ; leaving some space for our stuff (030h to 03fh).
        stack   set     040h
 
        ;-- Macros -------------------------------------------------------------
 
 
        ;-- Reset & interrupt vectors ------------------------------------------
 
        org     00h
        ljmp    start               ;
        org     03h
        ljmp    irq_unused
        org     0bh
        ljmp    irq_timer
        org     13h
        ljmp    irq_unused
        org     1bh
        ljmp    irq_unused
        org     23h
        ljmp    irq_uart
 
        ;-- Main test program --------------------------------------------------
        org     30h
start:
 
        ; Set up stack.
        mov     SP,#stack
 
        ; Clear ports P0 and P1, bearing in mind that on the demo platform,
        ; P0 is looped back into P2 and P1 to P3, and P1 is also connected to
        ; the external irq inputs.
        mov     P0,#000h
        mov     P1,#000h
 
        ; Initialize serial port...
        ; (actually, leave it with its default configuration: 19200-8-N-1)
 
        ; ...and dump the hello string to the serial port.
        mov     DPTR,#text0
        call    po_cstr
 
 
        ; Ok, now
        mov     IE,#000h
        mov     TSTAT,#000h
        mov     TCH,#0fch
        mov     TCL,#050h
        ; Enable timer interrupts and interrupts globally...
        mov     IE,#082h
        ; ...and start the timer with autoreload.
        mov     TSTAT,#030h
 
 
        ; End of test program, enter single-instruction endless loop.
        ; The timer will keep triggering interrupts indefinitely.
quit:   ajmp    $
 
; po_char:  Print character in ACC to console.
po_char:
        mov     SBUF,a
po_char_loop:
        jnb     TXRDY,po_char_loop
        ret
 
; po_cstr:  Prints zero-terminated string at XCODE:DPTR to console.
;           Returns after the whole string has been output.
po_cstr:
        push    var0
        mov     var0,#000h
po_cstr_loop:
        mov     a,var0
        inc     var0
        movc    a,@a+DPTR
        jz      po_cstr_done
        call    po_char
        sjmp    po_cstr_loop
po_cstr_done:
        pop     var0
        ret
 
        ; Unused interrupt routines, will never be reached.
irq_unused:
        reti
irq_uart:
        reti
 
        ; This timer routine is meant to show that the timer works; all it
        ; does is display a message every timer interrupt.
irq_timer:
        setb    TSTAT.0         ; Clear the timer irq flag writing a 1 on it
        push    DPH             ; Write a short message to the console...
        push    DPL
        mov     DPTR,#text1
        call    po_cstr
        pop     DPL             ; ...and quit
        pop     DPH
        reti
 
text0:  db      'Hello World!',13,10,00h,00h
text1:  db      'Tick!',13,10,00h
        end

Line No.	Rev	Author	Line
1	3	ja_rd	`; hello.a51 -- 'Hello World' on serial console.`
2			`;`
3			`; This small program is meant to be run on a light52 MCU on actual hardware,`
4			`; as a first sanity check.`
5			`;`
6			`; This version of the program does not use interrupts.`
7			`;`
8			`; If this program runs and displays its message on a terminal, you may then be`
9			`; sure that your development environment is working.`
10
11
12			`; Include the definitions for the light52 derivative`
13			`$nomod51`
14			`$include (light52.mcu)`
15
16			`;-- Data variable definitions ------------------------------------------`
17
18			`; These are general purpose variables for use in subroutines.`
19			`; They must be saved and restored before use.`
20			`var0 data 030h`
21
22			`; We'll place the stack above the reg banks and bit addressable area,`
23			`; leaving some space for our stuff (030h to 03fh).`
24			`stack set 040h`
25
26			`;-- Macros -------------------------------------------------------------`
27
28
29			`;-- Reset & interrupt vectors ------------------------------------------`
30
31			`org 00h`
32			`ljmp start ;`
33			`org 03h`
34			`ljmp irq_unused`
35			`org 0bh`
36			`ljmp irq_timer`
37			`org 13h`
38			`ljmp irq_unused`
39			`org 1bh`
40			`ljmp irq_unused`
41			`org 23h`
42			`ljmp irq_uart`
43
44			`;-- Main test program --------------------------------------------------`
45			`org 30h`
46			`start:`
47
48			`; Set up stack.`
49			`mov SP,#stack`
50
51			`; Clear ports P0 and P1, bearing in mind that on the demo platform,`
52			`; P0 is looped back into P2 and P1 to P3, and P1 is also connected to`
53			`; the external irq inputs.`
54			`mov P0,#000h`
55			`mov P1,#000h`
56
57			`; Initialize serial port...`
58			`; (actually, leave it with its default configuration: 19200-8-N-1)`
59
60			`; ...and dump the hello string to the serial port.`
61			`mov DPTR,#text0`
62			`call po_cstr`
63
64
65			`; Ok, now`
66			`mov IE,#000h`
67			`mov TSTAT,#000h`
68			`mov TCH,#0fch`
69			`mov TCL,#050h`
70			`; Enable timer interrupts and interrupts globally...`
71			`mov IE,#082h`
72			`; ...and start the timer with autoreload.`
73			`mov TSTAT,#030h`
74
75
76			`; End of test program, enter single-instruction endless loop.`
77			`; The timer will keep triggering interrupts indefinitely.`
78			`quit: ajmp $`
79
80			`; po_char: Print character in ACC to console.`
81			`po_char:`
82			`mov SBUF,a`
83			`po_char_loop:`
84			`jnb TXRDY,po_char_loop`
85			`ret`
86
87			`; po_cstr: Prints zero-terminated string at XCODE:DPTR to console.`
88			`; Returns after the whole string has been output.`
89			`po_cstr:`
90			`push var0`
91			`mov var0,#000h`
92			`po_cstr_loop:`
93			`mov a,var0`
94			`inc var0`
95			`movc a,@a+DPTR`
96			`jz po_cstr_done`
97			`call po_char`
98			`sjmp po_cstr_loop`
99			`po_cstr_done:`
100			`pop var0`
101			`ret`
102
103			`; Unused interrupt routines, will never be reached.`
104			`irq_unused:`
105			`reti`
106			`irq_uart:`
107			`reti`
108
109			`; This timer routine is meant to show that the timer works; all it`
110			`; does is display a message every timer interrupt.`
111			`irq_timer:`
112			`setb TSTAT.0 ; Clear the timer irq flag writing a 1 on it`
113			`push DPH ; Write a short message to the console...`
114			`push DPL`
115			`mov DPTR,#text1`
116			`call po_cstr`
117			`pop DPL ; ...and quit`
118			`pop DPH`
119			`reti`
120
121			`text0: db 'Hello World!',13,10,00h,00h`
122			`text1: db 'Tick!',13,10,00h`
123			`end`

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[/] [light52/] [trunk/] [test/] [hello_asm/] [src/] [hello.a51] - Blame information for rev 3