| ??? 10/07/03 20:02 Read: times |
#56283 - RE: Atmel 89C55WD cannot read with MOVC Responding to: ???'s previous message |
Oleg,
Below is the code failing to access code space. Lines 37 and 38 prints nothing, but line 45 and 46 prints proper values.
stmt level source
1 #ifndef PC_MODE
2 #pragma CODE DEBUG SYMBOLS LARGE ROM(LARGE) NOLISTINCLUDE OPTIMIZE(0,SPEED)
3 #endif
4
5 #include "sysconf.h"
6 #include "8255.h"
7 #include "lcd.h"
8 #include <string.h>
9
10 #ifndef PC_MODE
11
12
13 xdata char msg1[]="abc";
14 xdata char msg2[]="def";
15
16
17 void main()
18 {
19 1 bool temp;
20 1 data unsigned char xdata *p;
21 1
22 1 /*
data char same[8];
data char diff[8];
code volatile unsigned char cc=0x55;
data volatile unsigned char dd;
xdata volatile unsigned char xx;
*/
30 1 init_8255();
31 1 // PB = 0x55;
32 1
33 1 init_lcd();
34 1 lcd_open_backlight();
35 1 lcd_cursor_on();
36 1
37 1 lcd_print(10, 0, msg1);
38 1 lcd_print(10, 1, msg2);
39 1
40 1 for (temp = state_active_pin; state_active_pin == temp; );
41 1
42 1 msg1[0]='x';msg1[1]='1';msg1[2]='2';msg1[3]=0;
43 1 msg2[0]='x';msg2[1]='8';msg2[2]='7';msg2[3]=0;
44 1
45 1 lcd_print(0, 2, msg1);
46 1 lcd_print(0, 3, msg2);
47 1
48 1 lcd_print(0, 0, "test");
49 1 while(1);
50 1 }
51
52 #endif
53
C51 COMPILER V3.20, TEST 07/10/03 21:33:52 PAGE 2
ASSEMBLY LISTING OF GENERATED OBJECT CODE
; FUNCTION main (BEGIN)
; SOURCE LINE # 17
; SOURCE LINE # 18
; SOURCE LINE # 30
0000 120000 E LCALL init_8255
; SOURCE LINE # 33
0003 120000 E LCALL init_lcd
; SOURCE LINE # 34
0006 120000 E LCALL lcd_open_backlight
; SOURCE LINE # 35
0009 120000 E LCALL lcd_cursor_on
; SOURCE LINE # 37
000C 7F0A MOV R7,#0AH
000E 7D00 MOV R5,#00H
0010 7B02 MOV R3,#02H
0012 7A00 R MOV R2,#HIGH msg1
0014 7900 R MOV R1,#LOW msg1
0016 120000 E LCALL _lcd_print
; SOURCE LINE # 38
0019 7F0A MOV R7,#0AH
001B 7D01 MOV R5,#01H
001D 7B02 MOV R3,#02H
001F 7A00 R MOV R2,#HIGH msg2
0021 7900 R MOV R1,#LOW msg2
0023 120000 E LCALL _lcd_print
; SOURCE LINE # 40
0026 900000 MOV DPTR,#00H
0029 E0 MOVX A,@DPTR
002A FF MOV R7,A
002B EF MOV A,R7
002C C4 SWAP A
002D 13 RRC A
002E 13 RRC A
002F 13 RRC A
0030 5401 ANL A,#01H
0032 FF MOV R7,A
0033 EF MOV A,R7
0034 24FF ADD A,#0FFH
0036 9200 R MOV temp,C
0038 ?C0001:
0038 900000 MOV DPTR,#00H
003B E0 MOVX A,@DPTR
003C FF MOV R7,A
003D EF MOV A,R7
003E C4 SWAP A
003F 13 RRC A
0040 13 RRC A
0041 13 RRC A
0042 5401 ANL A,#01H
0044 FF MOV R7,A
0045 A200 R MOV C,temp
0047 E4 CLR A
0048 33 RLC A
0049 FE MOV R6,A
004A EF MOV A,R7
004B 6E XRL A,R6
004C 60EA JZ ?C0001
004E ?C0002:
; SOURCE LINE # 42
004E 900000 R MOV DPTR,#msg1
0051 7478 MOV A,#078H
0053 F0 MOVX @DPTR,A
0054 900000 R MOV DPTR,#msg1+01H
C51 COMPILER V3.20, TEST 07/10/03 21:33:52 PAGE 3
0057 7431 MOV A,#031H
0059 F0 MOVX @DPTR,A
005A 900000 R MOV DPTR,#msg1+02H
005D 7432 MOV A,#032H
005F F0 MOVX @DPTR,A
0060 900000 R MOV DPTR,#msg1+03H
0063 E4 CLR A
0064 F0 MOVX @DPTR,A
; SOURCE LINE # 43
0065 900000 R MOV DPTR,#msg2
0068 7478 MOV A,#078H
006A F0 MOVX @DPTR,A
006B 900000 R MOV DPTR,#msg2+01H
006E 7438 MOV A,#038H
0070 F0 MOVX @DPTR,A
0071 900000 R MOV DPTR,#msg2+02H
0074 7437 MOV A,#037H
0076 F0 MOVX @DPTR,A
0077 900000 R MOV DPTR,#msg2+03H
007A E4 CLR A
007B F0 MOVX @DPTR,A
; SOURCE LINE # 45
007C 7F00 MOV R7,#00H
007E 7D02 MOV R5,#02H
0080 7B02 MOV R3,#02H
0082 7A00 R MOV R2,#HIGH msg1
0084 7900 R MOV R1,#LOW msg1
0086 120000 E LCALL _lcd_print
; SOURCE LINE # 46
0089 7F00 MOV R7,#00H
008B 7D03 MOV R5,#03H
008D 7B02 MOV R3,#02H
008F 7A00 R MOV R2,#HIGH msg2
0091 7900 R MOV R1,#LOW msg2
0093 120000 E LCALL _lcd_print
; SOURCE LINE # 48
0096 7F00 MOV R7,#00H
0098 7D00 MOV R5,#00H
009A 7B05 MOV R3,#05H
009C 7A00 R MOV R2,#HIGH ?SC_0
009E 7900 R MOV R1,#LOW ?SC_0
00A0 120000 E LCALL _lcd_print
00A3 ?C0003:
; SOURCE LINE # 49
00A3 80FE SJMP ?C0003
00A5 ?C0004:
; SOURCE LINE # 50
00A5 ?C0005:
00A5 22 RET
; FUNCTION main (END)
I'm pretty sure that LCD proc is OK. I know that both lines produce quite similar code. The only difference is the msg1 and msg2 initialization performed by accessing code space. I verified (using debugger) that XDATA is cleared first and then variables are initialized. Below is the initialization part of msg1: ; mark1 0094H MOVC A,@A+DPTR ;BR 1 0095H INC DPTR 0096H XCH A,R0 0097H XCH A,DPL(82H) 0099H XCH A,R0 009AH XCH A,R2 009BH XCH A,DPH(83H) 009DH XCH A,R2 009EH MOVX @DPTR,A ; mark2 009FH INC DPTR 00A0H XCH A,R0 00A1H XCH A,DPL(82H) 00A3H XCH A,R0 00A4H XCH A,R2 00A5H XCH A,DPH(83H) 00A7H XCH A,R2 00A8H DJNZ R7,0093H 00AAH DJNZ R6,0093H 00ACH SJMP 006CH 00AEH CLR T1(0B5H) 00B0H MOV R7,#0FFH 00B2H MOV R6,#0FFH 00B4H MOV A,R7 00B5H DEC R7 00B6H MOV R4,06H 00B8H JNZ 00BBH 00BAH DEC R6 00BBH ORL A,R4 00BCH JNZ 00B4H at mark1, DPTR=492 and >d c:0x492 C:0492 61 62 63 00 44 80-0E 64 65 66 00 00 0A 0E abc.D..def.... C:04A0 11 11 11 11 0E 00 0A 11-11 11 11 11 0E 00 0E 11 ................ C:04B0 10 10 10 11 0E 04 0F 10-10 0E 01 01 1E 0C 0E 0E ................ C:04C0 11 10 17 11 0F 00 04 0E-04 04 04 04 0E 00 12 00 ................ >d msg1 X:800A - 00 00 00 00 00 00 ...... X:8010 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ X:8020 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ X:8030 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ at mark2, dptr=800a and >d msg1 X:800A - 61 00 00 00 00 00 a..... X:8010 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ X:8020 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ X:8030 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ However this code does not work at the target system when 89c55wd is used (which has 20K Flash) but works with 8952 (8K flash). I also dumped the head of the xdata (where msg1 resides) to the LCD and verified that it is not initialized. Based on these I conclude that I cannot read from code space with 89c55wd. hope it is clear... |
