>> (* please forgive the top-post *)
>> Arif --
>> >>> P1 = 0xFF; //ALL LEDs off
>> >>> P1 &= (0x1<<4); //LED 4 ON
>> Try:
>> P1 &= ~(1<<4) ; // LED 4 on.
>> your code was turning off LED4. The tilde (~) creates a bitmask that
>> will preserve the P1 bits. They will stay off.
>> well, it is just a guess. I am more of a Z80 programmer....
>> HTH,
>> *the other brian
---------------------------------------------------
Hello brian,
Thanks for your response.
Ah! The typo. Your observation is right. But this mistake was only in my email.
The code has the correct expression (i.e. P1 &= ~(1<<4)).
Also, I checked the hello390.asm file and the assembly code seems as expected
----------------------------------------------------------------------------------
__reset_vect:
ljmp __sdcc_gsinit_startup
;--------------------------------------------------------
; global & static initialisations
;--------------------------------------------------------
.area HOME (CODE)
.area GSINIT (CODE)
.area GSFINAL (CODE)
.area GSINIT (CODE)
__sdcc_gsinit_startup:
mov sp,#__start__stack - 1
lcall __sdcc_external_startup
mov a,dpl
jz __sdcc_init_data
ljmp __sdcc_program_startup
----------------------------------------------------------------------------------
Here, after reset __sdcc_gsinit_startup is called and then after adjusting the
stack pointer; __sdcc_external_startup is called.
----------------------------------------------------------------------------------
; function _sdcc_external_startup
; -----------------------------------------
__sdcc_external_startup:
ar2 = 0x02
ar3 = 0x03
ar4 = 0x04
ar5 = 0x05
ar6 = 0x06
ar7 = 0x07
ar0 = 0x00
ar1 = 0x01
; hello390.c:8: WTST = 0x00;
; genAssign: resultIsFar = FALSE
mov _WTST,#0x00
; hello390.c:9: CKCON = 0x01;
; genAssign: resultIsFar = FALSE
mov _CKCON,#0x01
; hello390.c:12: P1 = 0xFF;
; genAssign: resultIsFar = FALSE
mov _P1,#0xFF
; hello390.c:13: P1 &= ~(0x1<<4);
anl _P1,#0xEF
--------------------------------------------------------------------------------------
The above shown code for __sdcc_external_startup seems correct too. If the
control reaches here correctly, the LED must start to glow but it doesn't.
So it seems the control is not reaching inside __sdcc_external_startup.
Only suspicious thing which I can see is that __sdcc_external_startup is not in
HOME seg (0x00-0x4D == 77 bytes) instead it is in CODE seg (s_CSEG == 0x008D).
Thanks
Arif
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